3224 lines
82 KiB
C
3224 lines
82 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* KVM/MIPS: Support for hardware virtualization extensions
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*
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* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
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* Authors: Yann Le Du <ledu@kymasys.com>
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*/
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/preempt.h>
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#include <linux/vmalloc.h>
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#include <asm/cacheflush.h>
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#include <asm/cacheops.h>
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#include <asm/cmpxchg.h>
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#include <asm/fpu.h>
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#include <asm/hazards.h>
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#include <asm/inst.h>
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#include <asm/mmu_context.h>
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#include <asm/r4kcache.h>
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#include <asm/time.h>
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#include <asm/tlb.h>
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#include <asm/tlbex.h>
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#include <linux/kvm_host.h>
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#include "interrupt.h"
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#include "trace.h"
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/* Pointers to last VCPU loaded on each physical CPU */
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static struct kvm_vcpu *last_vcpu[NR_CPUS];
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/* Pointers to last VCPU executed on each physical CPU */
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static struct kvm_vcpu *last_exec_vcpu[NR_CPUS];
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/*
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* Number of guest VTLB entries to use, so we can catch inconsistency between
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* CPUs.
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*/
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static unsigned int kvm_vz_guest_vtlb_size;
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static inline long kvm_vz_read_gc0_ebase(void)
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{
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if (sizeof(long) == 8 && cpu_has_ebase_wg)
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return read_gc0_ebase_64();
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else
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return read_gc0_ebase();
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}
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static inline void kvm_vz_write_gc0_ebase(long v)
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{
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/*
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* First write with WG=1 to write upper bits, then write again in case
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* WG should be left at 0.
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* write_gc0_ebase_64() is no longer UNDEFINED since R6.
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*/
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if (sizeof(long) == 8 &&
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(cpu_has_mips64r6 || cpu_has_ebase_wg)) {
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write_gc0_ebase_64(v | MIPS_EBASE_WG);
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write_gc0_ebase_64(v);
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} else {
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write_gc0_ebase(v | MIPS_EBASE_WG);
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write_gc0_ebase(v);
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}
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}
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/*
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* These Config bits may be writable by the guest:
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* Config: [K23, KU] (!TLB), K0
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* Config1: (none)
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* Config2: [TU, SU] (impl)
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* Config3: ISAOnExc
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* Config4: FTLBPageSize
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* Config5: K, CV, MSAEn, UFE, FRE, SBRI, UFR
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*/
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static inline unsigned int kvm_vz_config_guest_wrmask(struct kvm_vcpu *vcpu)
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{
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return CONF_CM_CMASK;
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}
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static inline unsigned int kvm_vz_config1_guest_wrmask(struct kvm_vcpu *vcpu)
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{
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return 0;
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}
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static inline unsigned int kvm_vz_config2_guest_wrmask(struct kvm_vcpu *vcpu)
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{
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return 0;
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}
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static inline unsigned int kvm_vz_config3_guest_wrmask(struct kvm_vcpu *vcpu)
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{
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return MIPS_CONF3_ISA_OE;
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}
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static inline unsigned int kvm_vz_config4_guest_wrmask(struct kvm_vcpu *vcpu)
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{
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/* no need to be exact */
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return MIPS_CONF4_VFTLBPAGESIZE;
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}
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static inline unsigned int kvm_vz_config5_guest_wrmask(struct kvm_vcpu *vcpu)
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{
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unsigned int mask = MIPS_CONF5_K | MIPS_CONF5_CV | MIPS_CONF5_SBRI;
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/* Permit MSAEn changes if MSA supported and enabled */
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if (kvm_mips_guest_has_msa(&vcpu->arch))
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mask |= MIPS_CONF5_MSAEN;
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/*
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* Permit guest FPU mode changes if FPU is enabled and the relevant
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* feature exists according to FIR register.
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*/
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if (kvm_mips_guest_has_fpu(&vcpu->arch)) {
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if (cpu_has_ufr)
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mask |= MIPS_CONF5_UFR;
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if (cpu_has_fre)
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mask |= MIPS_CONF5_FRE | MIPS_CONF5_UFE;
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}
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return mask;
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}
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/*
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* VZ optionally allows these additional Config bits to be written by root:
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* Config: M, [MT]
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* Config1: M, [MMUSize-1, C2, MD, PC, WR, CA], FP
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* Config2: M
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* Config3: M, MSAP, [BPG], ULRI, [DSP2P, DSPP], CTXTC, [ITL, LPA, VEIC,
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* VInt, SP, CDMM, MT, SM, TL]
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* Config4: M, [VTLBSizeExt, MMUSizeExt]
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* Config5: MRP
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*/
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static inline unsigned int kvm_vz_config_user_wrmask(struct kvm_vcpu *vcpu)
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{
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return kvm_vz_config_guest_wrmask(vcpu) | MIPS_CONF_M;
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}
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static inline unsigned int kvm_vz_config1_user_wrmask(struct kvm_vcpu *vcpu)
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{
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unsigned int mask = kvm_vz_config1_guest_wrmask(vcpu) | MIPS_CONF_M;
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/* Permit FPU to be present if FPU is supported */
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if (kvm_mips_guest_can_have_fpu(&vcpu->arch))
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mask |= MIPS_CONF1_FP;
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return mask;
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}
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static inline unsigned int kvm_vz_config2_user_wrmask(struct kvm_vcpu *vcpu)
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{
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return kvm_vz_config2_guest_wrmask(vcpu) | MIPS_CONF_M;
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}
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static inline unsigned int kvm_vz_config3_user_wrmask(struct kvm_vcpu *vcpu)
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{
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unsigned int mask = kvm_vz_config3_guest_wrmask(vcpu) | MIPS_CONF_M |
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MIPS_CONF3_ULRI | MIPS_CONF3_CTXTC;
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/* Permit MSA to be present if MSA is supported */
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if (kvm_mips_guest_can_have_msa(&vcpu->arch))
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mask |= MIPS_CONF3_MSA;
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return mask;
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}
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static inline unsigned int kvm_vz_config4_user_wrmask(struct kvm_vcpu *vcpu)
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{
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return kvm_vz_config4_guest_wrmask(vcpu) | MIPS_CONF_M;
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}
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static inline unsigned int kvm_vz_config5_user_wrmask(struct kvm_vcpu *vcpu)
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{
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return kvm_vz_config5_guest_wrmask(vcpu) | MIPS_CONF5_MRP;
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}
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static gpa_t kvm_vz_gva_to_gpa_cb(gva_t gva)
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{
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/* VZ guest has already converted gva to gpa */
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return gva;
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}
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static void kvm_vz_queue_irq(struct kvm_vcpu *vcpu, unsigned int priority)
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{
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set_bit(priority, &vcpu->arch.pending_exceptions);
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clear_bit(priority, &vcpu->arch.pending_exceptions_clr);
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}
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static void kvm_vz_dequeue_irq(struct kvm_vcpu *vcpu, unsigned int priority)
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{
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clear_bit(priority, &vcpu->arch.pending_exceptions);
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set_bit(priority, &vcpu->arch.pending_exceptions_clr);
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}
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static void kvm_vz_queue_timer_int_cb(struct kvm_vcpu *vcpu)
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{
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/*
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* timer expiry is asynchronous to vcpu execution therefore defer guest
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* cp0 accesses
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*/
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kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_TIMER);
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}
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static void kvm_vz_dequeue_timer_int_cb(struct kvm_vcpu *vcpu)
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{
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/*
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* timer expiry is asynchronous to vcpu execution therefore defer guest
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* cp0 accesses
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*/
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kvm_vz_dequeue_irq(vcpu, MIPS_EXC_INT_TIMER);
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}
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static void kvm_vz_queue_io_int_cb(struct kvm_vcpu *vcpu,
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struct kvm_mips_interrupt *irq)
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{
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int intr = (int)irq->irq;
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/*
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* interrupts are asynchronous to vcpu execution therefore defer guest
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* cp0 accesses
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*/
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switch (intr) {
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case 2:
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kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_IO);
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break;
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case 3:
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kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_IPI_1);
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break;
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case 4:
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kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_IPI_2);
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break;
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default:
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break;
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}
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}
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static void kvm_vz_dequeue_io_int_cb(struct kvm_vcpu *vcpu,
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struct kvm_mips_interrupt *irq)
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{
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int intr = (int)irq->irq;
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/*
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* interrupts are asynchronous to vcpu execution therefore defer guest
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* cp0 accesses
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*/
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switch (intr) {
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case -2:
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kvm_vz_dequeue_irq(vcpu, MIPS_EXC_INT_IO);
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break;
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case -3:
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kvm_vz_dequeue_irq(vcpu, MIPS_EXC_INT_IPI_1);
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break;
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case -4:
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kvm_vz_dequeue_irq(vcpu, MIPS_EXC_INT_IPI_2);
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break;
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default:
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break;
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}
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}
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static u32 kvm_vz_priority_to_irq[MIPS_EXC_MAX] = {
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[MIPS_EXC_INT_TIMER] = C_IRQ5,
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[MIPS_EXC_INT_IO] = C_IRQ0,
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[MIPS_EXC_INT_IPI_1] = C_IRQ1,
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[MIPS_EXC_INT_IPI_2] = C_IRQ2,
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};
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static int kvm_vz_irq_deliver_cb(struct kvm_vcpu *vcpu, unsigned int priority,
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u32 cause)
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{
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u32 irq = (priority < MIPS_EXC_MAX) ?
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kvm_vz_priority_to_irq[priority] : 0;
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switch (priority) {
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case MIPS_EXC_INT_TIMER:
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set_gc0_cause(C_TI);
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break;
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case MIPS_EXC_INT_IO:
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case MIPS_EXC_INT_IPI_1:
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case MIPS_EXC_INT_IPI_2:
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if (cpu_has_guestctl2)
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set_c0_guestctl2(irq);
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else
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set_gc0_cause(irq);
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break;
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default:
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break;
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}
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clear_bit(priority, &vcpu->arch.pending_exceptions);
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return 1;
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}
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static int kvm_vz_irq_clear_cb(struct kvm_vcpu *vcpu, unsigned int priority,
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u32 cause)
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{
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u32 irq = (priority < MIPS_EXC_MAX) ?
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kvm_vz_priority_to_irq[priority] : 0;
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switch (priority) {
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case MIPS_EXC_INT_TIMER:
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/*
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* Call to kvm_write_c0_guest_compare() clears Cause.TI in
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* kvm_mips_emulate_CP0(). Explicitly clear irq associated with
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* Cause.IP[IPTI] if GuestCtl2 virtual interrupt register not
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* supported or if not using GuestCtl2 Hardware Clear.
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*/
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if (cpu_has_guestctl2) {
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if (!(read_c0_guestctl2() & (irq << 14)))
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clear_c0_guestctl2(irq);
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} else {
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clear_gc0_cause(irq);
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}
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break;
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case MIPS_EXC_INT_IO:
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case MIPS_EXC_INT_IPI_1:
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case MIPS_EXC_INT_IPI_2:
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/* Clear GuestCtl2.VIP irq if not using Hardware Clear */
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if (cpu_has_guestctl2) {
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if (!(read_c0_guestctl2() & (irq << 14)))
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clear_c0_guestctl2(irq);
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} else {
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clear_gc0_cause(irq);
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}
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break;
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default:
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break;
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}
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clear_bit(priority, &vcpu->arch.pending_exceptions_clr);
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return 1;
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}
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/*
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* VZ guest timer handling.
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*/
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/**
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* kvm_vz_should_use_htimer() - Find whether to use the VZ hard guest timer.
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* @vcpu: Virtual CPU.
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*
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* Returns: true if the VZ GTOffset & real guest CP0_Count should be used
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* instead of software emulation of guest timer.
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* false otherwise.
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*/
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static bool kvm_vz_should_use_htimer(struct kvm_vcpu *vcpu)
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{
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if (kvm_mips_count_disabled(vcpu))
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return false;
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/* Chosen frequency must match real frequency */
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if (mips_hpt_frequency != vcpu->arch.count_hz)
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return false;
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/* We don't support a CP0_GTOffset with fewer bits than CP0_Count */
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if (current_cpu_data.gtoffset_mask != 0xffffffff)
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return false;
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return true;
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}
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/**
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* _kvm_vz_restore_stimer() - Restore soft timer state.
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* @vcpu: Virtual CPU.
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* @compare: CP0_Compare register value, restored by caller.
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* @cause: CP0_Cause register to restore.
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*
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* Restore VZ state relating to the soft timer. The hard timer can be enabled
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* later.
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*/
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static void _kvm_vz_restore_stimer(struct kvm_vcpu *vcpu, u32 compare,
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u32 cause)
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{
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/*
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* Avoid spurious counter interrupts by setting Guest CP0_Count to just
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* after Guest CP0_Compare.
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*/
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write_c0_gtoffset(compare - read_c0_count());
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back_to_back_c0_hazard();
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write_gc0_cause(cause);
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}
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/**
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* _kvm_vz_restore_htimer() - Restore hard timer state.
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* @vcpu: Virtual CPU.
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* @compare: CP0_Compare register value, restored by caller.
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* @cause: CP0_Cause register to restore.
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*
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* Restore hard timer Guest.Count & Guest.Cause taking care to preserve the
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* value of Guest.CP0_Cause.TI while restoring Guest.CP0_Cause.
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*/
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static void _kvm_vz_restore_htimer(struct kvm_vcpu *vcpu,
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u32 compare, u32 cause)
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{
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u32 start_count, after_count;
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ktime_t freeze_time;
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unsigned long flags;
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/*
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* Freeze the soft-timer and sync the guest CP0_Count with it. We do
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* this with interrupts disabled to avoid latency.
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*/
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local_irq_save(flags);
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freeze_time = kvm_mips_freeze_hrtimer(vcpu, &start_count);
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write_c0_gtoffset(start_count - read_c0_count());
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local_irq_restore(flags);
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/* restore guest CP0_Cause, as TI may already be set */
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back_to_back_c0_hazard();
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write_gc0_cause(cause);
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/*
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* The above sequence isn't atomic and would result in lost timer
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* interrupts if we're not careful. Detect if a timer interrupt is due
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* and assert it.
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*/
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back_to_back_c0_hazard();
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after_count = read_gc0_count();
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if (after_count - start_count > compare - start_count - 1)
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kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_TIMER);
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}
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/**
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* kvm_vz_restore_timer() - Restore timer state.
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* @vcpu: Virtual CPU.
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*
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* Restore soft timer state from saved context.
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*/
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static void kvm_vz_restore_timer(struct kvm_vcpu *vcpu)
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{
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struct mips_coproc *cop0 = vcpu->arch.cop0;
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u32 cause, compare;
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compare = kvm_read_sw_gc0_compare(cop0);
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cause = kvm_read_sw_gc0_cause(cop0);
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write_gc0_compare(compare);
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_kvm_vz_restore_stimer(vcpu, compare, cause);
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}
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/**
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* kvm_vz_acquire_htimer() - Switch to hard timer state.
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* @vcpu: Virtual CPU.
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*
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* Restore hard timer state on top of existing soft timer state if possible.
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*
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* Since hard timer won't remain active over preemption, preemption should be
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* disabled by the caller.
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*/
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void kvm_vz_acquire_htimer(struct kvm_vcpu *vcpu)
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{
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u32 gctl0;
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gctl0 = read_c0_guestctl0();
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if (!(gctl0 & MIPS_GCTL0_GT) && kvm_vz_should_use_htimer(vcpu)) {
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/* enable guest access to hard timer */
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write_c0_guestctl0(gctl0 | MIPS_GCTL0_GT);
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_kvm_vz_restore_htimer(vcpu, read_gc0_compare(),
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read_gc0_cause());
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}
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}
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|
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/**
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* _kvm_vz_save_htimer() - Switch to software emulation of guest timer.
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* @vcpu: Virtual CPU.
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* @compare: Pointer to write compare value to.
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* @cause: Pointer to write cause value to.
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*
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* Save VZ guest timer state and switch to software emulation of guest CP0
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* timer. The hard timer must already be in use, so preemption should be
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* disabled.
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*/
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static void _kvm_vz_save_htimer(struct kvm_vcpu *vcpu,
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u32 *out_compare, u32 *out_cause)
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{
|
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u32 cause, compare, before_count, end_count;
|
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ktime_t before_time;
|
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|
|
compare = read_gc0_compare();
|
|
*out_compare = compare;
|
|
|
|
before_time = ktime_get();
|
|
|
|
/*
|
|
* Record the CP0_Count *prior* to saving CP0_Cause, so we have a time
|
|
* at which no pending timer interrupt is missing.
|
|
*/
|
|
before_count = read_gc0_count();
|
|
back_to_back_c0_hazard();
|
|
cause = read_gc0_cause();
|
|
*out_cause = cause;
|
|
|
|
/*
|
|
* Record a final CP0_Count which we will transfer to the soft-timer.
|
|
* This is recorded *after* saving CP0_Cause, so we don't get any timer
|
|
* interrupts from just after the final CP0_Count point.
|
|
*/
|
|
back_to_back_c0_hazard();
|
|
end_count = read_gc0_count();
|
|
|
|
/*
|
|
* The above sequence isn't atomic, so we could miss a timer interrupt
|
|
* between reading CP0_Cause and end_count. Detect and record any timer
|
|
* interrupt due between before_count and end_count.
|
|
*/
|
|
if (end_count - before_count > compare - before_count - 1)
|
|
kvm_vz_queue_irq(vcpu, MIPS_EXC_INT_TIMER);
|
|
|
|
/*
|
|
* Restore soft-timer, ignoring a small amount of negative drift due to
|
|
* delay between freeze_hrtimer and setting CP0_GTOffset.
|
|
*/
|
|
kvm_mips_restore_hrtimer(vcpu, before_time, end_count, -0x10000);
|
|
}
|
|
|
|
/**
|
|
* kvm_vz_save_timer() - Save guest timer state.
|
|
* @vcpu: Virtual CPU.
|
|
*
|
|
* Save VZ guest timer state and switch to soft guest timer if hard timer was in
|
|
* use.
|
|
*/
|
|
static void kvm_vz_save_timer(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct mips_coproc *cop0 = vcpu->arch.cop0;
|
|
u32 gctl0, compare, cause;
|
|
|
|
gctl0 = read_c0_guestctl0();
|
|
if (gctl0 & MIPS_GCTL0_GT) {
|
|
/* disable guest use of hard timer */
|
|
write_c0_guestctl0(gctl0 & ~MIPS_GCTL0_GT);
|
|
|
|
/* save hard timer state */
|
|
_kvm_vz_save_htimer(vcpu, &compare, &cause);
|
|
} else {
|
|
compare = read_gc0_compare();
|
|
cause = read_gc0_cause();
|
|
}
|
|
|
|
/* save timer-related state to VCPU context */
|
|
kvm_write_sw_gc0_cause(cop0, cause);
|
|
kvm_write_sw_gc0_compare(cop0, compare);
|
|
}
|
|
|
|
/**
|
|
* kvm_vz_lose_htimer() - Ensure hard guest timer is not in use.
|
|
* @vcpu: Virtual CPU.
|
|
*
|
|
* Transfers the state of the hard guest timer to the soft guest timer, leaving
|
|
* guest state intact so it can continue to be used with the soft timer.
|
|
*/
|
|
void kvm_vz_lose_htimer(struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 gctl0, compare, cause;
|
|
|
|
preempt_disable();
|
|
gctl0 = read_c0_guestctl0();
|
|
if (gctl0 & MIPS_GCTL0_GT) {
|
|
/* disable guest use of timer */
|
|
write_c0_guestctl0(gctl0 & ~MIPS_GCTL0_GT);
|
|
|
|
/* switch to soft timer */
|
|
_kvm_vz_save_htimer(vcpu, &compare, &cause);
|
|
|
|
/* leave soft timer in usable state */
|
|
_kvm_vz_restore_stimer(vcpu, compare, cause);
|
|
}
|
|
preempt_enable();
|
|
}
|
|
|
|
/**
|
|
* is_eva_access() - Find whether an instruction is an EVA memory accessor.
|
|
* @inst: 32-bit instruction encoding.
|
|
*
|
|
* Finds whether @inst encodes an EVA memory access instruction, which would
|
|
* indicate that emulation of it should access the user mode address space
|
|
* instead of the kernel mode address space. This matters for MUSUK segments
|
|
* which are TLB mapped for user mode but unmapped for kernel mode.
|
|
*
|
|
* Returns: Whether @inst encodes an EVA accessor instruction.
|
|
*/
|
|
static bool is_eva_access(union mips_instruction inst)
|
|
{
|
|
if (inst.spec3_format.opcode != spec3_op)
|
|
return false;
|
|
|
|
switch (inst.spec3_format.func) {
|
|
case lwle_op:
|
|
case lwre_op:
|
|
case cachee_op:
|
|
case sbe_op:
|
|
case she_op:
|
|
case sce_op:
|
|
case swe_op:
|
|
case swle_op:
|
|
case swre_op:
|
|
case prefe_op:
|
|
case lbue_op:
|
|
case lhue_op:
|
|
case lbe_op:
|
|
case lhe_op:
|
|
case lle_op:
|
|
case lwe_op:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* is_eva_am_mapped() - Find whether an access mode is mapped.
|
|
* @vcpu: KVM VCPU state.
|
|
* @am: 3-bit encoded access mode.
|
|
* @eu: Segment becomes unmapped and uncached when Status.ERL=1.
|
|
*
|
|
* Decode @am to find whether it encodes a mapped segment for the current VCPU
|
|
* state. Where necessary @eu and the actual instruction causing the fault are
|
|
* taken into account to make the decision.
|
|
*
|
|
* Returns: Whether the VCPU faulted on a TLB mapped address.
|
|
*/
|
|
static bool is_eva_am_mapped(struct kvm_vcpu *vcpu, unsigned int am, bool eu)
|
|
{
|
|
u32 am_lookup;
|
|
int err;
|
|
|
|
/*
|
|
* Interpret access control mode. We assume address errors will already
|
|
* have been caught by the guest, leaving us with:
|
|
* AM UM SM KM 31..24 23..16
|
|
* UK 0 000 Unm 0 0
|
|
* MK 1 001 TLB 1
|
|
* MSK 2 010 TLB TLB 1
|
|
* MUSK 3 011 TLB TLB TLB 1
|
|
* MUSUK 4 100 TLB TLB Unm 0 1
|
|
* USK 5 101 Unm Unm 0 0
|
|
* - 6 110 0 0
|
|
* UUSK 7 111 Unm Unm Unm 0 0
|
|
*
|
|
* We shift a magic value by AM across the sign bit to find if always
|
|
* TLB mapped, and if not shift by 8 again to find if it depends on KM.
|
|
*/
|
|
am_lookup = 0x70080000 << am;
|
|
if ((s32)am_lookup < 0) {
|
|
/*
|
|
* MK, MSK, MUSK
|
|
* Always TLB mapped, unless SegCtl.EU && ERL
|
|
*/
|
|
if (!eu || !(read_gc0_status() & ST0_ERL))
|
|
return true;
|
|
} else {
|
|
am_lookup <<= 8;
|
|
if ((s32)am_lookup < 0) {
|
|
union mips_instruction inst;
|
|
unsigned int status;
|
|
u32 *opc;
|
|
|
|
/*
|
|
* MUSUK
|
|
* TLB mapped if not in kernel mode
|
|
*/
|
|
status = read_gc0_status();
|
|
if (!(status & (ST0_EXL | ST0_ERL)) &&
|
|
(status & ST0_KSU))
|
|
return true;
|
|
/*
|
|
* EVA access instructions in kernel
|
|
* mode access user address space.
|
|
*/
|
|
opc = (u32 *)vcpu->arch.pc;
|
|
if (vcpu->arch.host_cp0_cause & CAUSEF_BD)
|
|
opc += 1;
|
|
err = kvm_get_badinstr(opc, vcpu, &inst.word);
|
|
if (!err && is_eva_access(inst))
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* kvm_vz_gva_to_gpa() - Convert valid GVA to GPA.
|
|
* @vcpu: KVM VCPU state.
|
|
* @gva: Guest virtual address to convert.
|
|
* @gpa: Output guest physical address.
|
|
*
|
|
* Convert a guest virtual address (GVA) which is valid according to the guest
|
|
* context, to a guest physical address (GPA).
|
|
*
|
|
* Returns: 0 on success.
|
|
* -errno on failure.
|
|
*/
|
|
static int kvm_vz_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
|
|
unsigned long *gpa)
|
|
{
|
|
u32 gva32 = gva;
|
|
unsigned long segctl;
|
|
|
|
if ((long)gva == (s32)gva32) {
|
|
/* Handle canonical 32-bit virtual address */
|
|
if (cpu_guest_has_segments) {
|
|
unsigned long mask, pa;
|
|
|
|
switch (gva32 >> 29) {
|
|
case 0:
|
|
case 1: /* CFG5 (1GB) */
|
|
segctl = read_gc0_segctl2() >> 16;
|
|
mask = (unsigned long)0xfc0000000ull;
|
|
break;
|
|
case 2:
|
|
case 3: /* CFG4 (1GB) */
|
|
segctl = read_gc0_segctl2();
|
|
mask = (unsigned long)0xfc0000000ull;
|
|
break;
|
|
case 4: /* CFG3 (512MB) */
|
|
segctl = read_gc0_segctl1() >> 16;
|
|
mask = (unsigned long)0xfe0000000ull;
|
|
break;
|
|
case 5: /* CFG2 (512MB) */
|
|
segctl = read_gc0_segctl1();
|
|
mask = (unsigned long)0xfe0000000ull;
|
|
break;
|
|
case 6: /* CFG1 (512MB) */
|
|
segctl = read_gc0_segctl0() >> 16;
|
|
mask = (unsigned long)0xfe0000000ull;
|
|
break;
|
|
case 7: /* CFG0 (512MB) */
|
|
segctl = read_gc0_segctl0();
|
|
mask = (unsigned long)0xfe0000000ull;
|
|
break;
|
|
default:
|
|
/*
|
|
* GCC 4.9 isn't smart enough to figure out that
|
|
* segctl and mask are always initialised.
|
|
*/
|
|
unreachable();
|
|
}
|
|
|
|
if (is_eva_am_mapped(vcpu, (segctl >> 4) & 0x7,
|
|
segctl & 0x0008))
|
|
goto tlb_mapped;
|
|
|
|
/* Unmapped, find guest physical address */
|
|
pa = (segctl << 20) & mask;
|
|
pa |= gva32 & ~mask;
|
|
*gpa = pa;
|
|
return 0;
|
|
} else if ((s32)gva32 < (s32)0xc0000000) {
|
|
/* legacy unmapped KSeg0 or KSeg1 */
|
|
*gpa = gva32 & 0x1fffffff;
|
|
return 0;
|
|
}
|
|
#ifdef CONFIG_64BIT
|
|
} else if ((gva & 0xc000000000000000) == 0x8000000000000000) {
|
|
/* XKPHYS */
|
|
if (cpu_guest_has_segments) {
|
|
/*
|
|
* Each of the 8 regions can be overridden by SegCtl2.XR
|
|
* to use SegCtl1.XAM.
|
|
*/
|
|
segctl = read_gc0_segctl2();
|
|
if (segctl & (1ull << (56 + ((gva >> 59) & 0x7)))) {
|
|
segctl = read_gc0_segctl1();
|
|
if (is_eva_am_mapped(vcpu, (segctl >> 59) & 0x7,
|
|
0))
|
|
goto tlb_mapped;
|
|
}
|
|
|
|
}
|
|
/*
|
|
* Traditionally fully unmapped.
|
|
* Bits 61:59 specify the CCA, which we can just mask off here.
|
|
* Bits 58:PABITS should be zero, but we shouldn't have got here
|
|
* if it wasn't.
|
|
*/
|
|
*gpa = gva & 0x07ffffffffffffff;
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
tlb_mapped:
|
|
return kvm_vz_guest_tlb_lookup(vcpu, gva, gpa);
|
|
}
|
|
|
|
/**
|
|
* kvm_vz_badvaddr_to_gpa() - Convert GVA BadVAddr from root exception to GPA.
|
|
* @vcpu: KVM VCPU state.
|
|
* @badvaddr: Root BadVAddr.
|
|
* @gpa: Output guest physical address.
|
|
*
|
|
* VZ implementations are permitted to report guest virtual addresses (GVA) in
|
|
* BadVAddr on a root exception during guest execution, instead of the more
|
|
* convenient guest physical addresses (GPA). When we get a GVA, this function
|
|
* converts it to a GPA, taking into account guest segmentation and guest TLB
|
|
* state.
|
|
*
|
|
* Returns: 0 on success.
|
|
* -errno on failure.
|
|
*/
|
|
static int kvm_vz_badvaddr_to_gpa(struct kvm_vcpu *vcpu, unsigned long badvaddr,
|
|
unsigned long *gpa)
|
|
{
|
|
unsigned int gexccode = (vcpu->arch.host_cp0_guestctl0 &
|
|
MIPS_GCTL0_GEXC) >> MIPS_GCTL0_GEXC_SHIFT;
|
|
|
|
/* If BadVAddr is GPA, then all is well in the world */
|
|
if (likely(gexccode == MIPS_GCTL0_GEXC_GPA)) {
|
|
*gpa = badvaddr;
|
|
return 0;
|
|
}
|
|
|
|
/* Otherwise we'd expect it to be GVA ... */
|
|
if (WARN(gexccode != MIPS_GCTL0_GEXC_GVA,
|
|
"Unexpected gexccode %#x\n", gexccode))
|
|
return -EINVAL;
|
|
|
|
/* ... and we need to perform the GVA->GPA translation in software */
|
|
return kvm_vz_gva_to_gpa(vcpu, badvaddr, gpa);
|
|
}
|
|
|
|
static int kvm_trap_vz_no_handler(struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 *opc = (u32 *) vcpu->arch.pc;
|
|
u32 cause = vcpu->arch.host_cp0_cause;
|
|
u32 exccode = (cause & CAUSEF_EXCCODE) >> CAUSEB_EXCCODE;
|
|
unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
|
|
u32 inst = 0;
|
|
|
|
/*
|
|
* Fetch the instruction.
|
|
*/
|
|
if (cause & CAUSEF_BD)
|
|
opc += 1;
|
|
kvm_get_badinstr(opc, vcpu, &inst);
|
|
|
|
kvm_err("Exception Code: %d not handled @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#x\n",
|
|
exccode, opc, inst, badvaddr,
|
|
read_gc0_status());
|
|
kvm_arch_vcpu_dump_regs(vcpu);
|
|
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
return RESUME_HOST;
|
|
}
|
|
|
|
static unsigned long mips_process_maar(unsigned int op, unsigned long val)
|
|
{
|
|
/* Mask off unused bits */
|
|
unsigned long mask = 0xfffff000 | MIPS_MAAR_S | MIPS_MAAR_VL;
|
|
|
|
if (read_gc0_pagegrain() & PG_ELPA)
|
|
mask |= 0x00ffffff00000000ull;
|
|
if (cpu_guest_has_mvh)
|
|
mask |= MIPS_MAAR_VH;
|
|
|
|
/* Set or clear VH */
|
|
if (op == mtc_op) {
|
|
/* clear VH */
|
|
val &= ~MIPS_MAAR_VH;
|
|
} else if (op == dmtc_op) {
|
|
/* set VH to match VL */
|
|
val &= ~MIPS_MAAR_VH;
|
|
if (val & MIPS_MAAR_VL)
|
|
val |= MIPS_MAAR_VH;
|
|
}
|
|
|
|
return val & mask;
|
|
}
|
|
|
|
static void kvm_write_maari(struct kvm_vcpu *vcpu, unsigned long val)
|
|
{
|
|
struct mips_coproc *cop0 = vcpu->arch.cop0;
|
|
|
|
val &= MIPS_MAARI_INDEX;
|
|
if (val == MIPS_MAARI_INDEX)
|
|
kvm_write_sw_gc0_maari(cop0, ARRAY_SIZE(vcpu->arch.maar) - 1);
|
|
else if (val < ARRAY_SIZE(vcpu->arch.maar))
|
|
kvm_write_sw_gc0_maari(cop0, val);
|
|
}
|
|
|
|
static enum emulation_result kvm_vz_gpsi_cop0(union mips_instruction inst,
|
|
u32 *opc, u32 cause,
|
|
struct kvm_run *run,
|
|
struct kvm_vcpu *vcpu)
|
|
{
|
|
struct mips_coproc *cop0 = vcpu->arch.cop0;
|
|
enum emulation_result er = EMULATE_DONE;
|
|
u32 rt, rd, sel;
|
|
unsigned long curr_pc;
|
|
unsigned long val;
|
|
|
|
/*
|
|
* Update PC and hold onto current PC in case there is
|
|
* an error and we want to rollback the PC
|
|
*/
|
|
curr_pc = vcpu->arch.pc;
|
|
er = update_pc(vcpu, cause);
|
|
if (er == EMULATE_FAIL)
|
|
return er;
|
|
|
|
if (inst.co_format.co) {
|
|
switch (inst.co_format.func) {
|
|
case wait_op:
|
|
er = kvm_mips_emul_wait(vcpu);
|
|
break;
|
|
default:
|
|
er = EMULATE_FAIL;
|
|
}
|
|
} else {
|
|
rt = inst.c0r_format.rt;
|
|
rd = inst.c0r_format.rd;
|
|
sel = inst.c0r_format.sel;
|
|
|
|
switch (inst.c0r_format.rs) {
|
|
case dmfc_op:
|
|
case mfc_op:
|
|
#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS
|
|
cop0->stat[rd][sel]++;
|
|
#endif
|
|
if (rd == MIPS_CP0_COUNT &&
|
|
sel == 0) { /* Count */
|
|
val = kvm_mips_read_count(vcpu);
|
|
} else if (rd == MIPS_CP0_COMPARE &&
|
|
sel == 0) { /* Compare */
|
|
val = read_gc0_compare();
|
|
} else if (rd == MIPS_CP0_LLADDR &&
|
|
sel == 0) { /* LLAddr */
|
|
if (cpu_guest_has_rw_llb)
|
|
val = read_gc0_lladdr() &
|
|
MIPS_LLADDR_LLB;
|
|
else
|
|
val = 0;
|
|
} else if (rd == MIPS_CP0_LLADDR &&
|
|
sel == 1 && /* MAAR */
|
|
cpu_guest_has_maar &&
|
|
!cpu_guest_has_dyn_maar) {
|
|
/* MAARI must be in range */
|
|
BUG_ON(kvm_read_sw_gc0_maari(cop0) >=
|
|
ARRAY_SIZE(vcpu->arch.maar));
|
|
val = vcpu->arch.maar[
|
|
kvm_read_sw_gc0_maari(cop0)];
|
|
} else if ((rd == MIPS_CP0_PRID &&
|
|
(sel == 0 || /* PRid */
|
|
sel == 2 || /* CDMMBase */
|
|
sel == 3)) || /* CMGCRBase */
|
|
(rd == MIPS_CP0_STATUS &&
|
|
(sel == 2 || /* SRSCtl */
|
|
sel == 3)) || /* SRSMap */
|
|
(rd == MIPS_CP0_CONFIG &&
|
|
(sel == 7)) || /* Config7 */
|
|
(rd == MIPS_CP0_LLADDR &&
|
|
(sel == 2) && /* MAARI */
|
|
cpu_guest_has_maar &&
|
|
!cpu_guest_has_dyn_maar) ||
|
|
(rd == MIPS_CP0_ERRCTL &&
|
|
(sel == 0))) { /* ErrCtl */
|
|
val = cop0->reg[rd][sel];
|
|
} else {
|
|
val = 0;
|
|
er = EMULATE_FAIL;
|
|
}
|
|
|
|
if (er != EMULATE_FAIL) {
|
|
/* Sign extend */
|
|
if (inst.c0r_format.rs == mfc_op)
|
|
val = (int)val;
|
|
vcpu->arch.gprs[rt] = val;
|
|
}
|
|
|
|
trace_kvm_hwr(vcpu, (inst.c0r_format.rs == mfc_op) ?
|
|
KVM_TRACE_MFC0 : KVM_TRACE_DMFC0,
|
|
KVM_TRACE_COP0(rd, sel), val);
|
|
break;
|
|
|
|
case dmtc_op:
|
|
case mtc_op:
|
|
#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS
|
|
cop0->stat[rd][sel]++;
|
|
#endif
|
|
val = vcpu->arch.gprs[rt];
|
|
trace_kvm_hwr(vcpu, (inst.c0r_format.rs == mtc_op) ?
|
|
KVM_TRACE_MTC0 : KVM_TRACE_DMTC0,
|
|
KVM_TRACE_COP0(rd, sel), val);
|
|
|
|
if (rd == MIPS_CP0_COUNT &&
|
|
sel == 0) { /* Count */
|
|
kvm_vz_lose_htimer(vcpu);
|
|
kvm_mips_write_count(vcpu, vcpu->arch.gprs[rt]);
|
|
} else if (rd == MIPS_CP0_COMPARE &&
|
|
sel == 0) { /* Compare */
|
|
kvm_mips_write_compare(vcpu,
|
|
vcpu->arch.gprs[rt],
|
|
true);
|
|
} else if (rd == MIPS_CP0_LLADDR &&
|
|
sel == 0) { /* LLAddr */
|
|
/*
|
|
* P5600 generates GPSI on guest MTC0 LLAddr.
|
|
* Only allow the guest to clear LLB.
|
|
*/
|
|
if (cpu_guest_has_rw_llb &&
|
|
!(val & MIPS_LLADDR_LLB))
|
|
write_gc0_lladdr(0);
|
|
} else if (rd == MIPS_CP0_LLADDR &&
|
|
sel == 1 && /* MAAR */
|
|
cpu_guest_has_maar &&
|
|
!cpu_guest_has_dyn_maar) {
|
|
val = mips_process_maar(inst.c0r_format.rs,
|
|
val);
|
|
|
|
/* MAARI must be in range */
|
|
BUG_ON(kvm_read_sw_gc0_maari(cop0) >=
|
|
ARRAY_SIZE(vcpu->arch.maar));
|
|
vcpu->arch.maar[kvm_read_sw_gc0_maari(cop0)] =
|
|
val;
|
|
} else if (rd == MIPS_CP0_LLADDR &&
|
|
(sel == 2) && /* MAARI */
|
|
cpu_guest_has_maar &&
|
|
!cpu_guest_has_dyn_maar) {
|
|
kvm_write_maari(vcpu, val);
|
|
} else if (rd == MIPS_CP0_ERRCTL &&
|
|
(sel == 0)) { /* ErrCtl */
|
|
/* ignore the written value */
|
|
} else {
|
|
er = EMULATE_FAIL;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
er = EMULATE_FAIL;
|
|
break;
|
|
}
|
|
}
|
|
/* Rollback PC only if emulation was unsuccessful */
|
|
if (er == EMULATE_FAIL) {
|
|
kvm_err("[%#lx]%s: unsupported cop0 instruction 0x%08x\n",
|
|
curr_pc, __func__, inst.word);
|
|
|
|
vcpu->arch.pc = curr_pc;
|
|
}
|
|
|
|
return er;
|
|
}
|
|
|
|
static enum emulation_result kvm_vz_gpsi_cache(union mips_instruction inst,
|
|
u32 *opc, u32 cause,
|
|
struct kvm_run *run,
|
|
struct kvm_vcpu *vcpu)
|
|
{
|
|
enum emulation_result er = EMULATE_DONE;
|
|
u32 cache, op_inst, op, base;
|
|
s16 offset;
|
|
struct kvm_vcpu_arch *arch = &vcpu->arch;
|
|
unsigned long va, curr_pc;
|
|
|
|
/*
|
|
* Update PC and hold onto current PC in case there is
|
|
* an error and we want to rollback the PC
|
|
*/
|
|
curr_pc = vcpu->arch.pc;
|
|
er = update_pc(vcpu, cause);
|
|
if (er == EMULATE_FAIL)
|
|
return er;
|
|
|
|
base = inst.i_format.rs;
|
|
op_inst = inst.i_format.rt;
|
|
if (cpu_has_mips_r6)
|
|
offset = inst.spec3_format.simmediate;
|
|
else
|
|
offset = inst.i_format.simmediate;
|
|
cache = op_inst & CacheOp_Cache;
|
|
op = op_inst & CacheOp_Op;
|
|
|
|
va = arch->gprs[base] + offset;
|
|
|
|
kvm_debug("CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n",
|
|
cache, op, base, arch->gprs[base], offset);
|
|
|
|
/* Secondary or tirtiary cache ops ignored */
|
|
if (cache != Cache_I && cache != Cache_D)
|
|
return EMULATE_DONE;
|
|
|
|
switch (op_inst) {
|
|
case Index_Invalidate_I:
|
|
flush_icache_line_indexed(va);
|
|
return EMULATE_DONE;
|
|
case Index_Writeback_Inv_D:
|
|
flush_dcache_line_indexed(va);
|
|
return EMULATE_DONE;
|
|
case Hit_Invalidate_I:
|
|
case Hit_Invalidate_D:
|
|
case Hit_Writeback_Inv_D:
|
|
if (boot_cpu_type() == CPU_CAVIUM_OCTEON3) {
|
|
/* We can just flush entire icache */
|
|
local_flush_icache_range(0, 0);
|
|
return EMULATE_DONE;
|
|
}
|
|
|
|
/* So far, other platforms support guest hit cache ops */
|
|
break;
|
|
default:
|
|
break;
|
|
};
|
|
|
|
kvm_err("@ %#lx/%#lx CACHE (cache: %#x, op: %#x, base[%d]: %#lx, offset: %#x\n",
|
|
curr_pc, vcpu->arch.gprs[31], cache, op, base, arch->gprs[base],
|
|
offset);
|
|
/* Rollback PC */
|
|
vcpu->arch.pc = curr_pc;
|
|
|
|
return EMULATE_FAIL;
|
|
}
|
|
|
|
static enum emulation_result kvm_trap_vz_handle_gpsi(u32 cause, u32 *opc,
|
|
struct kvm_vcpu *vcpu)
|
|
{
|
|
enum emulation_result er = EMULATE_DONE;
|
|
struct kvm_vcpu_arch *arch = &vcpu->arch;
|
|
struct kvm_run *run = vcpu->run;
|
|
union mips_instruction inst;
|
|
int rd, rt, sel;
|
|
int err;
|
|
|
|
/*
|
|
* Fetch the instruction.
|
|
*/
|
|
if (cause & CAUSEF_BD)
|
|
opc += 1;
|
|
err = kvm_get_badinstr(opc, vcpu, &inst.word);
|
|
if (err)
|
|
return EMULATE_FAIL;
|
|
|
|
switch (inst.r_format.opcode) {
|
|
case cop0_op:
|
|
er = kvm_vz_gpsi_cop0(inst, opc, cause, run, vcpu);
|
|
break;
|
|
#ifndef CONFIG_CPU_MIPSR6
|
|
case cache_op:
|
|
trace_kvm_exit(vcpu, KVM_TRACE_EXIT_CACHE);
|
|
er = kvm_vz_gpsi_cache(inst, opc, cause, run, vcpu);
|
|
break;
|
|
#endif
|
|
case spec3_op:
|
|
switch (inst.spec3_format.func) {
|
|
#ifdef CONFIG_CPU_MIPSR6
|
|
case cache6_op:
|
|
trace_kvm_exit(vcpu, KVM_TRACE_EXIT_CACHE);
|
|
er = kvm_vz_gpsi_cache(inst, opc, cause, run, vcpu);
|
|
break;
|
|
#endif
|
|
case rdhwr_op:
|
|
if (inst.r_format.rs || (inst.r_format.re >> 3))
|
|
goto unknown;
|
|
|
|
rd = inst.r_format.rd;
|
|
rt = inst.r_format.rt;
|
|
sel = inst.r_format.re & 0x7;
|
|
|
|
switch (rd) {
|
|
case MIPS_HWR_CC: /* Read count register */
|
|
arch->gprs[rt] =
|
|
(long)(int)kvm_mips_read_count(vcpu);
|
|
break;
|
|
default:
|
|
trace_kvm_hwr(vcpu, KVM_TRACE_RDHWR,
|
|
KVM_TRACE_HWR(rd, sel), 0);
|
|
goto unknown;
|
|
};
|
|
|
|
trace_kvm_hwr(vcpu, KVM_TRACE_RDHWR,
|
|
KVM_TRACE_HWR(rd, sel), arch->gprs[rt]);
|
|
|
|
er = update_pc(vcpu, cause);
|
|
break;
|
|
default:
|
|
goto unknown;
|
|
};
|
|
break;
|
|
unknown:
|
|
|
|
default:
|
|
kvm_err("GPSI exception not supported (%p/%#x)\n",
|
|
opc, inst.word);
|
|
kvm_arch_vcpu_dump_regs(vcpu);
|
|
er = EMULATE_FAIL;
|
|
break;
|
|
}
|
|
|
|
return er;
|
|
}
|
|
|
|
static enum emulation_result kvm_trap_vz_handle_gsfc(u32 cause, u32 *opc,
|
|
struct kvm_vcpu *vcpu)
|
|
{
|
|
enum emulation_result er = EMULATE_DONE;
|
|
struct kvm_vcpu_arch *arch = &vcpu->arch;
|
|
union mips_instruction inst;
|
|
int err;
|
|
|
|
/*
|
|
* Fetch the instruction.
|
|
*/
|
|
if (cause & CAUSEF_BD)
|
|
opc += 1;
|
|
err = kvm_get_badinstr(opc, vcpu, &inst.word);
|
|
if (err)
|
|
return EMULATE_FAIL;
|
|
|
|
/* complete MTC0 on behalf of guest and advance EPC */
|
|
if (inst.c0r_format.opcode == cop0_op &&
|
|
inst.c0r_format.rs == mtc_op &&
|
|
inst.c0r_format.z == 0) {
|
|
int rt = inst.c0r_format.rt;
|
|
int rd = inst.c0r_format.rd;
|
|
int sel = inst.c0r_format.sel;
|
|
unsigned int val = arch->gprs[rt];
|
|
unsigned int old_val, change;
|
|
|
|
trace_kvm_hwr(vcpu, KVM_TRACE_MTC0, KVM_TRACE_COP0(rd, sel),
|
|
val);
|
|
|
|
if ((rd == MIPS_CP0_STATUS) && (sel == 0)) {
|
|
/* FR bit should read as zero if no FPU */
|
|
if (!kvm_mips_guest_has_fpu(&vcpu->arch))
|
|
val &= ~(ST0_CU1 | ST0_FR);
|
|
|
|
/*
|
|
* Also don't allow FR to be set if host doesn't support
|
|
* it.
|
|
*/
|
|
if (!(boot_cpu_data.fpu_id & MIPS_FPIR_F64))
|
|
val &= ~ST0_FR;
|
|
|
|
old_val = read_gc0_status();
|
|
change = val ^ old_val;
|
|
|
|
if (change & ST0_FR) {
|
|
/*
|
|
* FPU and Vector register state is made
|
|
* UNPREDICTABLE by a change of FR, so don't
|
|
* even bother saving it.
|
|
*/
|
|
kvm_drop_fpu(vcpu);
|
|
}
|
|
|
|
/*
|
|
* If MSA state is already live, it is undefined how it
|
|
* interacts with FR=0 FPU state, and we don't want to
|
|
* hit reserved instruction exceptions trying to save
|
|
* the MSA state later when CU=1 && FR=1, so play it
|
|
* safe and save it first.
|
|
*/
|
|
if (change & ST0_CU1 && !(val & ST0_FR) &&
|
|
vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA)
|
|
kvm_lose_fpu(vcpu);
|
|
|
|
write_gc0_status(val);
|
|
} else if ((rd == MIPS_CP0_CAUSE) && (sel == 0)) {
|
|
u32 old_cause = read_gc0_cause();
|
|
u32 change = old_cause ^ val;
|
|
|
|
/* DC bit enabling/disabling timer? */
|
|
if (change & CAUSEF_DC) {
|
|
if (val & CAUSEF_DC) {
|
|
kvm_vz_lose_htimer(vcpu);
|
|
kvm_mips_count_disable_cause(vcpu);
|
|
} else {
|
|
kvm_mips_count_enable_cause(vcpu);
|
|
}
|
|
}
|
|
|
|
/* Only certain bits are RW to the guest */
|
|
change &= (CAUSEF_DC | CAUSEF_IV | CAUSEF_WP |
|
|
CAUSEF_IP0 | CAUSEF_IP1);
|
|
|
|
/* WP can only be cleared */
|
|
change &= ~CAUSEF_WP | old_cause;
|
|
|
|
write_gc0_cause(old_cause ^ change);
|
|
} else if ((rd == MIPS_CP0_STATUS) && (sel == 1)) { /* IntCtl */
|
|
write_gc0_intctl(val);
|
|
} else if ((rd == MIPS_CP0_CONFIG) && (sel == 5)) {
|
|
old_val = read_gc0_config5();
|
|
change = val ^ old_val;
|
|
/* Handle changes in FPU/MSA modes */
|
|
preempt_disable();
|
|
|
|
/*
|
|
* Propagate FRE changes immediately if the FPU
|
|
* context is already loaded.
|
|
*/
|
|
if (change & MIPS_CONF5_FRE &&
|
|
vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU)
|
|
change_c0_config5(MIPS_CONF5_FRE, val);
|
|
|
|
preempt_enable();
|
|
|
|
val = old_val ^
|
|
(change & kvm_vz_config5_guest_wrmask(vcpu));
|
|
write_gc0_config5(val);
|
|
} else {
|
|
kvm_err("Handle GSFC, unsupported field change @ %p: %#x\n",
|
|
opc, inst.word);
|
|
er = EMULATE_FAIL;
|
|
}
|
|
|
|
if (er != EMULATE_FAIL)
|
|
er = update_pc(vcpu, cause);
|
|
} else {
|
|
kvm_err("Handle GSFC, unrecognized instruction @ %p: %#x\n",
|
|
opc, inst.word);
|
|
er = EMULATE_FAIL;
|
|
}
|
|
|
|
return er;
|
|
}
|
|
|
|
static enum emulation_result kvm_trap_vz_handle_ghfc(u32 cause, u32 *opc,
|
|
struct kvm_vcpu *vcpu)
|
|
{
|
|
/*
|
|
* Presumably this is due to MC (guest mode change), so lets trace some
|
|
* relevant info.
|
|
*/
|
|
trace_kvm_guest_mode_change(vcpu);
|
|
|
|
return EMULATE_DONE;
|
|
}
|
|
|
|
static enum emulation_result kvm_trap_vz_handle_hc(u32 cause, u32 *opc,
|
|
struct kvm_vcpu *vcpu)
|
|
{
|
|
enum emulation_result er;
|
|
union mips_instruction inst;
|
|
unsigned long curr_pc;
|
|
int err;
|
|
|
|
if (cause & CAUSEF_BD)
|
|
opc += 1;
|
|
err = kvm_get_badinstr(opc, vcpu, &inst.word);
|
|
if (err)
|
|
return EMULATE_FAIL;
|
|
|
|
/*
|
|
* Update PC and hold onto current PC in case there is
|
|
* an error and we want to rollback the PC
|
|
*/
|
|
curr_pc = vcpu->arch.pc;
|
|
er = update_pc(vcpu, cause);
|
|
if (er == EMULATE_FAIL)
|
|
return er;
|
|
|
|
er = kvm_mips_emul_hypcall(vcpu, inst);
|
|
if (er == EMULATE_FAIL)
|
|
vcpu->arch.pc = curr_pc;
|
|
|
|
return er;
|
|
}
|
|
|
|
static enum emulation_result kvm_trap_vz_no_handler_guest_exit(u32 gexccode,
|
|
u32 cause,
|
|
u32 *opc,
|
|
struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 inst;
|
|
|
|
/*
|
|
* Fetch the instruction.
|
|
*/
|
|
if (cause & CAUSEF_BD)
|
|
opc += 1;
|
|
kvm_get_badinstr(opc, vcpu, &inst);
|
|
|
|
kvm_err("Guest Exception Code: %d not yet handled @ PC: %p, inst: 0x%08x Status: %#x\n",
|
|
gexccode, opc, inst, read_gc0_status());
|
|
|
|
return EMULATE_FAIL;
|
|
}
|
|
|
|
static int kvm_trap_vz_handle_guest_exit(struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 *opc = (u32 *) vcpu->arch.pc;
|
|
u32 cause = vcpu->arch.host_cp0_cause;
|
|
enum emulation_result er = EMULATE_DONE;
|
|
u32 gexccode = (vcpu->arch.host_cp0_guestctl0 &
|
|
MIPS_GCTL0_GEXC) >> MIPS_GCTL0_GEXC_SHIFT;
|
|
int ret = RESUME_GUEST;
|
|
|
|
trace_kvm_exit(vcpu, KVM_TRACE_EXIT_GEXCCODE_BASE + gexccode);
|
|
switch (gexccode) {
|
|
case MIPS_GCTL0_GEXC_GPSI:
|
|
++vcpu->stat.vz_gpsi_exits;
|
|
er = kvm_trap_vz_handle_gpsi(cause, opc, vcpu);
|
|
break;
|
|
case MIPS_GCTL0_GEXC_GSFC:
|
|
++vcpu->stat.vz_gsfc_exits;
|
|
er = kvm_trap_vz_handle_gsfc(cause, opc, vcpu);
|
|
break;
|
|
case MIPS_GCTL0_GEXC_HC:
|
|
++vcpu->stat.vz_hc_exits;
|
|
er = kvm_trap_vz_handle_hc(cause, opc, vcpu);
|
|
break;
|
|
case MIPS_GCTL0_GEXC_GRR:
|
|
++vcpu->stat.vz_grr_exits;
|
|
er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc,
|
|
vcpu);
|
|
break;
|
|
case MIPS_GCTL0_GEXC_GVA:
|
|
++vcpu->stat.vz_gva_exits;
|
|
er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc,
|
|
vcpu);
|
|
break;
|
|
case MIPS_GCTL0_GEXC_GHFC:
|
|
++vcpu->stat.vz_ghfc_exits;
|
|
er = kvm_trap_vz_handle_ghfc(cause, opc, vcpu);
|
|
break;
|
|
case MIPS_GCTL0_GEXC_GPA:
|
|
++vcpu->stat.vz_gpa_exits;
|
|
er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc,
|
|
vcpu);
|
|
break;
|
|
default:
|
|
++vcpu->stat.vz_resvd_exits;
|
|
er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc,
|
|
vcpu);
|
|
break;
|
|
|
|
}
|
|
|
|
if (er == EMULATE_DONE) {
|
|
ret = RESUME_GUEST;
|
|
} else if (er == EMULATE_HYPERCALL) {
|
|
ret = kvm_mips_handle_hypcall(vcpu);
|
|
} else {
|
|
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
ret = RESUME_HOST;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* kvm_trap_vz_handle_cop_unusuable() - Guest used unusable coprocessor.
|
|
* @vcpu: Virtual CPU context.
|
|
*
|
|
* Handle when the guest attempts to use a coprocessor which hasn't been allowed
|
|
* by the root context.
|
|
*/
|
|
static int kvm_trap_vz_handle_cop_unusable(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_run *run = vcpu->run;
|
|
u32 cause = vcpu->arch.host_cp0_cause;
|
|
enum emulation_result er = EMULATE_FAIL;
|
|
int ret = RESUME_GUEST;
|
|
|
|
if (((cause & CAUSEF_CE) >> CAUSEB_CE) == 1) {
|
|
/*
|
|
* If guest FPU not present, the FPU operation should have been
|
|
* treated as a reserved instruction!
|
|
* If FPU already in use, we shouldn't get this at all.
|
|
*/
|
|
if (WARN_ON(!kvm_mips_guest_has_fpu(&vcpu->arch) ||
|
|
vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU)) {
|
|
preempt_enable();
|
|
return EMULATE_FAIL;
|
|
}
|
|
|
|
kvm_own_fpu(vcpu);
|
|
er = EMULATE_DONE;
|
|
}
|
|
/* other coprocessors not handled */
|
|
|
|
switch (er) {
|
|
case EMULATE_DONE:
|
|
ret = RESUME_GUEST;
|
|
break;
|
|
|
|
case EMULATE_FAIL:
|
|
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
ret = RESUME_HOST;
|
|
break;
|
|
|
|
default:
|
|
BUG();
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* kvm_trap_vz_handle_msa_disabled() - Guest used MSA while disabled in root.
|
|
* @vcpu: Virtual CPU context.
|
|
*
|
|
* Handle when the guest attempts to use MSA when it is disabled in the root
|
|
* context.
|
|
*/
|
|
static int kvm_trap_vz_handle_msa_disabled(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_run *run = vcpu->run;
|
|
|
|
/*
|
|
* If MSA not present or not exposed to guest or FR=0, the MSA operation
|
|
* should have been treated as a reserved instruction!
|
|
* Same if CU1=1, FR=0.
|
|
* If MSA already in use, we shouldn't get this at all.
|
|
*/
|
|
if (!kvm_mips_guest_has_msa(&vcpu->arch) ||
|
|
(read_gc0_status() & (ST0_CU1 | ST0_FR)) == ST0_CU1 ||
|
|
!(read_gc0_config5() & MIPS_CONF5_MSAEN) ||
|
|
vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA) {
|
|
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
return RESUME_HOST;
|
|
}
|
|
|
|
kvm_own_msa(vcpu);
|
|
|
|
return RESUME_GUEST;
|
|
}
|
|
|
|
static int kvm_trap_vz_handle_tlb_ld_miss(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_run *run = vcpu->run;
|
|
u32 *opc = (u32 *) vcpu->arch.pc;
|
|
u32 cause = vcpu->arch.host_cp0_cause;
|
|
ulong badvaddr = vcpu->arch.host_cp0_badvaddr;
|
|
union mips_instruction inst;
|
|
enum emulation_result er = EMULATE_DONE;
|
|
int err, ret = RESUME_GUEST;
|
|
|
|
if (kvm_mips_handle_vz_root_tlb_fault(badvaddr, vcpu, false)) {
|
|
/* A code fetch fault doesn't count as an MMIO */
|
|
if (kvm_is_ifetch_fault(&vcpu->arch)) {
|
|
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
return RESUME_HOST;
|
|
}
|
|
|
|
/* Fetch the instruction */
|
|
if (cause & CAUSEF_BD)
|
|
opc += 1;
|
|
err = kvm_get_badinstr(opc, vcpu, &inst.word);
|
|
if (err) {
|
|
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
return RESUME_HOST;
|
|
}
|
|
|
|
/* Treat as MMIO */
|
|
er = kvm_mips_emulate_load(inst, cause, run, vcpu);
|
|
if (er == EMULATE_FAIL) {
|
|
kvm_err("Guest Emulate Load from MMIO space failed: PC: %p, BadVaddr: %#lx\n",
|
|
opc, badvaddr);
|
|
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
}
|
|
}
|
|
|
|
if (er == EMULATE_DONE) {
|
|
ret = RESUME_GUEST;
|
|
} else if (er == EMULATE_DO_MMIO) {
|
|
run->exit_reason = KVM_EXIT_MMIO;
|
|
ret = RESUME_HOST;
|
|
} else {
|
|
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
ret = RESUME_HOST;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int kvm_trap_vz_handle_tlb_st_miss(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_run *run = vcpu->run;
|
|
u32 *opc = (u32 *) vcpu->arch.pc;
|
|
u32 cause = vcpu->arch.host_cp0_cause;
|
|
ulong badvaddr = vcpu->arch.host_cp0_badvaddr;
|
|
union mips_instruction inst;
|
|
enum emulation_result er = EMULATE_DONE;
|
|
int err;
|
|
int ret = RESUME_GUEST;
|
|
|
|
/* Just try the access again if we couldn't do the translation */
|
|
if (kvm_vz_badvaddr_to_gpa(vcpu, badvaddr, &badvaddr))
|
|
return RESUME_GUEST;
|
|
vcpu->arch.host_cp0_badvaddr = badvaddr;
|
|
|
|
if (kvm_mips_handle_vz_root_tlb_fault(badvaddr, vcpu, true)) {
|
|
/* Fetch the instruction */
|
|
if (cause & CAUSEF_BD)
|
|
opc += 1;
|
|
err = kvm_get_badinstr(opc, vcpu, &inst.word);
|
|
if (err) {
|
|
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
return RESUME_HOST;
|
|
}
|
|
|
|
/* Treat as MMIO */
|
|
er = kvm_mips_emulate_store(inst, cause, run, vcpu);
|
|
if (er == EMULATE_FAIL) {
|
|
kvm_err("Guest Emulate Store to MMIO space failed: PC: %p, BadVaddr: %#lx\n",
|
|
opc, badvaddr);
|
|
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
}
|
|
}
|
|
|
|
if (er == EMULATE_DONE) {
|
|
ret = RESUME_GUEST;
|
|
} else if (er == EMULATE_DO_MMIO) {
|
|
run->exit_reason = KVM_EXIT_MMIO;
|
|
ret = RESUME_HOST;
|
|
} else {
|
|
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
ret = RESUME_HOST;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static u64 kvm_vz_get_one_regs[] = {
|
|
KVM_REG_MIPS_CP0_INDEX,
|
|
KVM_REG_MIPS_CP0_ENTRYLO0,
|
|
KVM_REG_MIPS_CP0_ENTRYLO1,
|
|
KVM_REG_MIPS_CP0_CONTEXT,
|
|
KVM_REG_MIPS_CP0_PAGEMASK,
|
|
KVM_REG_MIPS_CP0_PAGEGRAIN,
|
|
KVM_REG_MIPS_CP0_WIRED,
|
|
KVM_REG_MIPS_CP0_HWRENA,
|
|
KVM_REG_MIPS_CP0_BADVADDR,
|
|
KVM_REG_MIPS_CP0_COUNT,
|
|
KVM_REG_MIPS_CP0_ENTRYHI,
|
|
KVM_REG_MIPS_CP0_COMPARE,
|
|
KVM_REG_MIPS_CP0_STATUS,
|
|
KVM_REG_MIPS_CP0_INTCTL,
|
|
KVM_REG_MIPS_CP0_CAUSE,
|
|
KVM_REG_MIPS_CP0_EPC,
|
|
KVM_REG_MIPS_CP0_PRID,
|
|
KVM_REG_MIPS_CP0_EBASE,
|
|
KVM_REG_MIPS_CP0_CONFIG,
|
|
KVM_REG_MIPS_CP0_CONFIG1,
|
|
KVM_REG_MIPS_CP0_CONFIG2,
|
|
KVM_REG_MIPS_CP0_CONFIG3,
|
|
KVM_REG_MIPS_CP0_CONFIG4,
|
|
KVM_REG_MIPS_CP0_CONFIG5,
|
|
#ifdef CONFIG_64BIT
|
|
KVM_REG_MIPS_CP0_XCONTEXT,
|
|
#endif
|
|
KVM_REG_MIPS_CP0_ERROREPC,
|
|
|
|
KVM_REG_MIPS_COUNT_CTL,
|
|
KVM_REG_MIPS_COUNT_RESUME,
|
|
KVM_REG_MIPS_COUNT_HZ,
|
|
};
|
|
|
|
static u64 kvm_vz_get_one_regs_contextconfig[] = {
|
|
KVM_REG_MIPS_CP0_CONTEXTCONFIG,
|
|
#ifdef CONFIG_64BIT
|
|
KVM_REG_MIPS_CP0_XCONTEXTCONFIG,
|
|
#endif
|
|
};
|
|
|
|
static u64 kvm_vz_get_one_regs_segments[] = {
|
|
KVM_REG_MIPS_CP0_SEGCTL0,
|
|
KVM_REG_MIPS_CP0_SEGCTL1,
|
|
KVM_REG_MIPS_CP0_SEGCTL2,
|
|
};
|
|
|
|
static u64 kvm_vz_get_one_regs_htw[] = {
|
|
KVM_REG_MIPS_CP0_PWBASE,
|
|
KVM_REG_MIPS_CP0_PWFIELD,
|
|
KVM_REG_MIPS_CP0_PWSIZE,
|
|
KVM_REG_MIPS_CP0_PWCTL,
|
|
};
|
|
|
|
static u64 kvm_vz_get_one_regs_kscratch[] = {
|
|
KVM_REG_MIPS_CP0_KSCRATCH1,
|
|
KVM_REG_MIPS_CP0_KSCRATCH2,
|
|
KVM_REG_MIPS_CP0_KSCRATCH3,
|
|
KVM_REG_MIPS_CP0_KSCRATCH4,
|
|
KVM_REG_MIPS_CP0_KSCRATCH5,
|
|
KVM_REG_MIPS_CP0_KSCRATCH6,
|
|
};
|
|
|
|
static unsigned long kvm_vz_num_regs(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long ret;
|
|
|
|
ret = ARRAY_SIZE(kvm_vz_get_one_regs);
|
|
if (cpu_guest_has_userlocal)
|
|
++ret;
|
|
if (cpu_guest_has_badinstr)
|
|
++ret;
|
|
if (cpu_guest_has_badinstrp)
|
|
++ret;
|
|
if (cpu_guest_has_contextconfig)
|
|
ret += ARRAY_SIZE(kvm_vz_get_one_regs_contextconfig);
|
|
if (cpu_guest_has_segments)
|
|
ret += ARRAY_SIZE(kvm_vz_get_one_regs_segments);
|
|
if (cpu_guest_has_htw)
|
|
ret += ARRAY_SIZE(kvm_vz_get_one_regs_htw);
|
|
if (cpu_guest_has_maar && !cpu_guest_has_dyn_maar)
|
|
ret += 1 + ARRAY_SIZE(vcpu->arch.maar);
|
|
ret += __arch_hweight8(cpu_data[0].guest.kscratch_mask);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int kvm_vz_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices)
|
|
{
|
|
u64 index;
|
|
unsigned int i;
|
|
|
|
if (copy_to_user(indices, kvm_vz_get_one_regs,
|
|
sizeof(kvm_vz_get_one_regs)))
|
|
return -EFAULT;
|
|
indices += ARRAY_SIZE(kvm_vz_get_one_regs);
|
|
|
|
if (cpu_guest_has_userlocal) {
|
|
index = KVM_REG_MIPS_CP0_USERLOCAL;
|
|
if (copy_to_user(indices, &index, sizeof(index)))
|
|
return -EFAULT;
|
|
++indices;
|
|
}
|
|
if (cpu_guest_has_badinstr) {
|
|
index = KVM_REG_MIPS_CP0_BADINSTR;
|
|
if (copy_to_user(indices, &index, sizeof(index)))
|
|
return -EFAULT;
|
|
++indices;
|
|
}
|
|
if (cpu_guest_has_badinstrp) {
|
|
index = KVM_REG_MIPS_CP0_BADINSTRP;
|
|
if (copy_to_user(indices, &index, sizeof(index)))
|
|
return -EFAULT;
|
|
++indices;
|
|
}
|
|
if (cpu_guest_has_contextconfig) {
|
|
if (copy_to_user(indices, kvm_vz_get_one_regs_contextconfig,
|
|
sizeof(kvm_vz_get_one_regs_contextconfig)))
|
|
return -EFAULT;
|
|
indices += ARRAY_SIZE(kvm_vz_get_one_regs_contextconfig);
|
|
}
|
|
if (cpu_guest_has_segments) {
|
|
if (copy_to_user(indices, kvm_vz_get_one_regs_segments,
|
|
sizeof(kvm_vz_get_one_regs_segments)))
|
|
return -EFAULT;
|
|
indices += ARRAY_SIZE(kvm_vz_get_one_regs_segments);
|
|
}
|
|
if (cpu_guest_has_htw) {
|
|
if (copy_to_user(indices, kvm_vz_get_one_regs_htw,
|
|
sizeof(kvm_vz_get_one_regs_htw)))
|
|
return -EFAULT;
|
|
indices += ARRAY_SIZE(kvm_vz_get_one_regs_htw);
|
|
}
|
|
if (cpu_guest_has_maar && !cpu_guest_has_dyn_maar) {
|
|
for (i = 0; i < ARRAY_SIZE(vcpu->arch.maar); ++i) {
|
|
index = KVM_REG_MIPS_CP0_MAAR(i);
|
|
if (copy_to_user(indices, &index, sizeof(index)))
|
|
return -EFAULT;
|
|
++indices;
|
|
}
|
|
|
|
index = KVM_REG_MIPS_CP0_MAARI;
|
|
if (copy_to_user(indices, &index, sizeof(index)))
|
|
return -EFAULT;
|
|
++indices;
|
|
}
|
|
for (i = 0; i < 6; ++i) {
|
|
if (!cpu_guest_has_kscr(i + 2))
|
|
continue;
|
|
|
|
if (copy_to_user(indices, &kvm_vz_get_one_regs_kscratch[i],
|
|
sizeof(kvm_vz_get_one_regs_kscratch[i])))
|
|
return -EFAULT;
|
|
++indices;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline s64 entrylo_kvm_to_user(unsigned long v)
|
|
{
|
|
s64 mask, ret = v;
|
|
|
|
if (BITS_PER_LONG == 32) {
|
|
/*
|
|
* KVM API exposes 64-bit version of the register, so move the
|
|
* RI/XI bits up into place.
|
|
*/
|
|
mask = MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI;
|
|
ret &= ~mask;
|
|
ret |= ((s64)v & mask) << 32;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static inline unsigned long entrylo_user_to_kvm(s64 v)
|
|
{
|
|
unsigned long mask, ret = v;
|
|
|
|
if (BITS_PER_LONG == 32) {
|
|
/*
|
|
* KVM API exposes 64-bit versiono of the register, so move the
|
|
* RI/XI bits down into place.
|
|
*/
|
|
mask = MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI;
|
|
ret &= ~mask;
|
|
ret |= (v >> 32) & mask;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int kvm_vz_get_one_reg(struct kvm_vcpu *vcpu,
|
|
const struct kvm_one_reg *reg,
|
|
s64 *v)
|
|
{
|
|
struct mips_coproc *cop0 = vcpu->arch.cop0;
|
|
unsigned int idx;
|
|
|
|
switch (reg->id) {
|
|
case KVM_REG_MIPS_CP0_INDEX:
|
|
*v = (long)read_gc0_index();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_ENTRYLO0:
|
|
*v = entrylo_kvm_to_user(read_gc0_entrylo0());
|
|
break;
|
|
case KVM_REG_MIPS_CP0_ENTRYLO1:
|
|
*v = entrylo_kvm_to_user(read_gc0_entrylo1());
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONTEXT:
|
|
*v = (long)read_gc0_context();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONTEXTCONFIG:
|
|
if (!cpu_guest_has_contextconfig)
|
|
return -EINVAL;
|
|
*v = read_gc0_contextconfig();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_USERLOCAL:
|
|
if (!cpu_guest_has_userlocal)
|
|
return -EINVAL;
|
|
*v = read_gc0_userlocal();
|
|
break;
|
|
#ifdef CONFIG_64BIT
|
|
case KVM_REG_MIPS_CP0_XCONTEXTCONFIG:
|
|
if (!cpu_guest_has_contextconfig)
|
|
return -EINVAL;
|
|
*v = read_gc0_xcontextconfig();
|
|
break;
|
|
#endif
|
|
case KVM_REG_MIPS_CP0_PAGEMASK:
|
|
*v = (long)read_gc0_pagemask();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_PAGEGRAIN:
|
|
*v = (long)read_gc0_pagegrain();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_SEGCTL0:
|
|
if (!cpu_guest_has_segments)
|
|
return -EINVAL;
|
|
*v = read_gc0_segctl0();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_SEGCTL1:
|
|
if (!cpu_guest_has_segments)
|
|
return -EINVAL;
|
|
*v = read_gc0_segctl1();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_SEGCTL2:
|
|
if (!cpu_guest_has_segments)
|
|
return -EINVAL;
|
|
*v = read_gc0_segctl2();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_PWBASE:
|
|
if (!cpu_guest_has_htw)
|
|
return -EINVAL;
|
|
*v = read_gc0_pwbase();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_PWFIELD:
|
|
if (!cpu_guest_has_htw)
|
|
return -EINVAL;
|
|
*v = read_gc0_pwfield();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_PWSIZE:
|
|
if (!cpu_guest_has_htw)
|
|
return -EINVAL;
|
|
*v = read_gc0_pwsize();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_WIRED:
|
|
*v = (long)read_gc0_wired();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_PWCTL:
|
|
if (!cpu_guest_has_htw)
|
|
return -EINVAL;
|
|
*v = read_gc0_pwctl();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_HWRENA:
|
|
*v = (long)read_gc0_hwrena();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_BADVADDR:
|
|
*v = (long)read_gc0_badvaddr();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_BADINSTR:
|
|
if (!cpu_guest_has_badinstr)
|
|
return -EINVAL;
|
|
*v = read_gc0_badinstr();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_BADINSTRP:
|
|
if (!cpu_guest_has_badinstrp)
|
|
return -EINVAL;
|
|
*v = read_gc0_badinstrp();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_COUNT:
|
|
*v = kvm_mips_read_count(vcpu);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_ENTRYHI:
|
|
*v = (long)read_gc0_entryhi();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_COMPARE:
|
|
*v = (long)read_gc0_compare();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_STATUS:
|
|
*v = (long)read_gc0_status();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_INTCTL:
|
|
*v = read_gc0_intctl();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CAUSE:
|
|
*v = (long)read_gc0_cause();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_EPC:
|
|
*v = (long)read_gc0_epc();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_PRID:
|
|
switch (boot_cpu_type()) {
|
|
case CPU_CAVIUM_OCTEON3:
|
|
/* Octeon III has a read-only guest.PRid */
|
|
*v = read_gc0_prid();
|
|
break;
|
|
default:
|
|
*v = (long)kvm_read_c0_guest_prid(cop0);
|
|
break;
|
|
};
|
|
break;
|
|
case KVM_REG_MIPS_CP0_EBASE:
|
|
*v = kvm_vz_read_gc0_ebase();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG:
|
|
*v = read_gc0_config();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG1:
|
|
if (!cpu_guest_has_conf1)
|
|
return -EINVAL;
|
|
*v = read_gc0_config1();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG2:
|
|
if (!cpu_guest_has_conf2)
|
|
return -EINVAL;
|
|
*v = read_gc0_config2();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG3:
|
|
if (!cpu_guest_has_conf3)
|
|
return -EINVAL;
|
|
*v = read_gc0_config3();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG4:
|
|
if (!cpu_guest_has_conf4)
|
|
return -EINVAL;
|
|
*v = read_gc0_config4();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG5:
|
|
if (!cpu_guest_has_conf5)
|
|
return -EINVAL;
|
|
*v = read_gc0_config5();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_MAAR(0) ... KVM_REG_MIPS_CP0_MAAR(0x3f):
|
|
if (!cpu_guest_has_maar || cpu_guest_has_dyn_maar)
|
|
return -EINVAL;
|
|
idx = reg->id - KVM_REG_MIPS_CP0_MAAR(0);
|
|
if (idx >= ARRAY_SIZE(vcpu->arch.maar))
|
|
return -EINVAL;
|
|
*v = vcpu->arch.maar[idx];
|
|
break;
|
|
case KVM_REG_MIPS_CP0_MAARI:
|
|
if (!cpu_guest_has_maar || cpu_guest_has_dyn_maar)
|
|
return -EINVAL;
|
|
*v = kvm_read_sw_gc0_maari(vcpu->arch.cop0);
|
|
break;
|
|
#ifdef CONFIG_64BIT
|
|
case KVM_REG_MIPS_CP0_XCONTEXT:
|
|
*v = read_gc0_xcontext();
|
|
break;
|
|
#endif
|
|
case KVM_REG_MIPS_CP0_ERROREPC:
|
|
*v = (long)read_gc0_errorepc();
|
|
break;
|
|
case KVM_REG_MIPS_CP0_KSCRATCH1 ... KVM_REG_MIPS_CP0_KSCRATCH6:
|
|
idx = reg->id - KVM_REG_MIPS_CP0_KSCRATCH1 + 2;
|
|
if (!cpu_guest_has_kscr(idx))
|
|
return -EINVAL;
|
|
switch (idx) {
|
|
case 2:
|
|
*v = (long)read_gc0_kscratch1();
|
|
break;
|
|
case 3:
|
|
*v = (long)read_gc0_kscratch2();
|
|
break;
|
|
case 4:
|
|
*v = (long)read_gc0_kscratch3();
|
|
break;
|
|
case 5:
|
|
*v = (long)read_gc0_kscratch4();
|
|
break;
|
|
case 6:
|
|
*v = (long)read_gc0_kscratch5();
|
|
break;
|
|
case 7:
|
|
*v = (long)read_gc0_kscratch6();
|
|
break;
|
|
}
|
|
break;
|
|
case KVM_REG_MIPS_COUNT_CTL:
|
|
*v = vcpu->arch.count_ctl;
|
|
break;
|
|
case KVM_REG_MIPS_COUNT_RESUME:
|
|
*v = ktime_to_ns(vcpu->arch.count_resume);
|
|
break;
|
|
case KVM_REG_MIPS_COUNT_HZ:
|
|
*v = vcpu->arch.count_hz;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_vz_set_one_reg(struct kvm_vcpu *vcpu,
|
|
const struct kvm_one_reg *reg,
|
|
s64 v)
|
|
{
|
|
struct mips_coproc *cop0 = vcpu->arch.cop0;
|
|
unsigned int idx;
|
|
int ret = 0;
|
|
unsigned int cur, change;
|
|
|
|
switch (reg->id) {
|
|
case KVM_REG_MIPS_CP0_INDEX:
|
|
write_gc0_index(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_ENTRYLO0:
|
|
write_gc0_entrylo0(entrylo_user_to_kvm(v));
|
|
break;
|
|
case KVM_REG_MIPS_CP0_ENTRYLO1:
|
|
write_gc0_entrylo1(entrylo_user_to_kvm(v));
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONTEXT:
|
|
write_gc0_context(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONTEXTCONFIG:
|
|
if (!cpu_guest_has_contextconfig)
|
|
return -EINVAL;
|
|
write_gc0_contextconfig(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_USERLOCAL:
|
|
if (!cpu_guest_has_userlocal)
|
|
return -EINVAL;
|
|
write_gc0_userlocal(v);
|
|
break;
|
|
#ifdef CONFIG_64BIT
|
|
case KVM_REG_MIPS_CP0_XCONTEXTCONFIG:
|
|
if (!cpu_guest_has_contextconfig)
|
|
return -EINVAL;
|
|
write_gc0_xcontextconfig(v);
|
|
break;
|
|
#endif
|
|
case KVM_REG_MIPS_CP0_PAGEMASK:
|
|
write_gc0_pagemask(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_PAGEGRAIN:
|
|
write_gc0_pagegrain(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_SEGCTL0:
|
|
if (!cpu_guest_has_segments)
|
|
return -EINVAL;
|
|
write_gc0_segctl0(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_SEGCTL1:
|
|
if (!cpu_guest_has_segments)
|
|
return -EINVAL;
|
|
write_gc0_segctl1(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_SEGCTL2:
|
|
if (!cpu_guest_has_segments)
|
|
return -EINVAL;
|
|
write_gc0_segctl2(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_PWBASE:
|
|
if (!cpu_guest_has_htw)
|
|
return -EINVAL;
|
|
write_gc0_pwbase(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_PWFIELD:
|
|
if (!cpu_guest_has_htw)
|
|
return -EINVAL;
|
|
write_gc0_pwfield(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_PWSIZE:
|
|
if (!cpu_guest_has_htw)
|
|
return -EINVAL;
|
|
write_gc0_pwsize(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_WIRED:
|
|
change_gc0_wired(MIPSR6_WIRED_WIRED, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_PWCTL:
|
|
if (!cpu_guest_has_htw)
|
|
return -EINVAL;
|
|
write_gc0_pwctl(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_HWRENA:
|
|
write_gc0_hwrena(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_BADVADDR:
|
|
write_gc0_badvaddr(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_BADINSTR:
|
|
if (!cpu_guest_has_badinstr)
|
|
return -EINVAL;
|
|
write_gc0_badinstr(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_BADINSTRP:
|
|
if (!cpu_guest_has_badinstrp)
|
|
return -EINVAL;
|
|
write_gc0_badinstrp(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_COUNT:
|
|
kvm_mips_write_count(vcpu, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_ENTRYHI:
|
|
write_gc0_entryhi(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_COMPARE:
|
|
kvm_mips_write_compare(vcpu, v, false);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_STATUS:
|
|
write_gc0_status(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_INTCTL:
|
|
write_gc0_intctl(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CAUSE:
|
|
/*
|
|
* If the timer is stopped or started (DC bit) it must look
|
|
* atomic with changes to the timer interrupt pending bit (TI).
|
|
* A timer interrupt should not happen in between.
|
|
*/
|
|
if ((read_gc0_cause() ^ v) & CAUSEF_DC) {
|
|
if (v & CAUSEF_DC) {
|
|
/* disable timer first */
|
|
kvm_mips_count_disable_cause(vcpu);
|
|
change_gc0_cause((u32)~CAUSEF_DC, v);
|
|
} else {
|
|
/* enable timer last */
|
|
change_gc0_cause((u32)~CAUSEF_DC, v);
|
|
kvm_mips_count_enable_cause(vcpu);
|
|
}
|
|
} else {
|
|
write_gc0_cause(v);
|
|
}
|
|
break;
|
|
case KVM_REG_MIPS_CP0_EPC:
|
|
write_gc0_epc(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_PRID:
|
|
switch (boot_cpu_type()) {
|
|
case CPU_CAVIUM_OCTEON3:
|
|
/* Octeon III has a guest.PRid, but its read-only */
|
|
break;
|
|
default:
|
|
kvm_write_c0_guest_prid(cop0, v);
|
|
break;
|
|
};
|
|
break;
|
|
case KVM_REG_MIPS_CP0_EBASE:
|
|
kvm_vz_write_gc0_ebase(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG:
|
|
cur = read_gc0_config();
|
|
change = (cur ^ v) & kvm_vz_config_user_wrmask(vcpu);
|
|
if (change) {
|
|
v = cur ^ change;
|
|
write_gc0_config(v);
|
|
}
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG1:
|
|
if (!cpu_guest_has_conf1)
|
|
break;
|
|
cur = read_gc0_config1();
|
|
change = (cur ^ v) & kvm_vz_config1_user_wrmask(vcpu);
|
|
if (change) {
|
|
v = cur ^ change;
|
|
write_gc0_config1(v);
|
|
}
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG2:
|
|
if (!cpu_guest_has_conf2)
|
|
break;
|
|
cur = read_gc0_config2();
|
|
change = (cur ^ v) & kvm_vz_config2_user_wrmask(vcpu);
|
|
if (change) {
|
|
v = cur ^ change;
|
|
write_gc0_config2(v);
|
|
}
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG3:
|
|
if (!cpu_guest_has_conf3)
|
|
break;
|
|
cur = read_gc0_config3();
|
|
change = (cur ^ v) & kvm_vz_config3_user_wrmask(vcpu);
|
|
if (change) {
|
|
v = cur ^ change;
|
|
write_gc0_config3(v);
|
|
}
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG4:
|
|
if (!cpu_guest_has_conf4)
|
|
break;
|
|
cur = read_gc0_config4();
|
|
change = (cur ^ v) & kvm_vz_config4_user_wrmask(vcpu);
|
|
if (change) {
|
|
v = cur ^ change;
|
|
write_gc0_config4(v);
|
|
}
|
|
break;
|
|
case KVM_REG_MIPS_CP0_CONFIG5:
|
|
if (!cpu_guest_has_conf5)
|
|
break;
|
|
cur = read_gc0_config5();
|
|
change = (cur ^ v) & kvm_vz_config5_user_wrmask(vcpu);
|
|
if (change) {
|
|
v = cur ^ change;
|
|
write_gc0_config5(v);
|
|
}
|
|
break;
|
|
case KVM_REG_MIPS_CP0_MAAR(0) ... KVM_REG_MIPS_CP0_MAAR(0x3f):
|
|
if (!cpu_guest_has_maar || cpu_guest_has_dyn_maar)
|
|
return -EINVAL;
|
|
idx = reg->id - KVM_REG_MIPS_CP0_MAAR(0);
|
|
if (idx >= ARRAY_SIZE(vcpu->arch.maar))
|
|
return -EINVAL;
|
|
vcpu->arch.maar[idx] = mips_process_maar(dmtc_op, v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_MAARI:
|
|
if (!cpu_guest_has_maar || cpu_guest_has_dyn_maar)
|
|
return -EINVAL;
|
|
kvm_write_maari(vcpu, v);
|
|
break;
|
|
#ifdef CONFIG_64BIT
|
|
case KVM_REG_MIPS_CP0_XCONTEXT:
|
|
write_gc0_xcontext(v);
|
|
break;
|
|
#endif
|
|
case KVM_REG_MIPS_CP0_ERROREPC:
|
|
write_gc0_errorepc(v);
|
|
break;
|
|
case KVM_REG_MIPS_CP0_KSCRATCH1 ... KVM_REG_MIPS_CP0_KSCRATCH6:
|
|
idx = reg->id - KVM_REG_MIPS_CP0_KSCRATCH1 + 2;
|
|
if (!cpu_guest_has_kscr(idx))
|
|
return -EINVAL;
|
|
switch (idx) {
|
|
case 2:
|
|
write_gc0_kscratch1(v);
|
|
break;
|
|
case 3:
|
|
write_gc0_kscratch2(v);
|
|
break;
|
|
case 4:
|
|
write_gc0_kscratch3(v);
|
|
break;
|
|
case 5:
|
|
write_gc0_kscratch4(v);
|
|
break;
|
|
case 6:
|
|
write_gc0_kscratch5(v);
|
|
break;
|
|
case 7:
|
|
write_gc0_kscratch6(v);
|
|
break;
|
|
}
|
|
break;
|
|
case KVM_REG_MIPS_COUNT_CTL:
|
|
ret = kvm_mips_set_count_ctl(vcpu, v);
|
|
break;
|
|
case KVM_REG_MIPS_COUNT_RESUME:
|
|
ret = kvm_mips_set_count_resume(vcpu, v);
|
|
break;
|
|
case KVM_REG_MIPS_COUNT_HZ:
|
|
ret = kvm_mips_set_count_hz(vcpu, v);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
#define guestid_cache(cpu) (cpu_data[cpu].guestid_cache)
|
|
static void kvm_vz_get_new_guestid(unsigned long cpu, struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long guestid = guestid_cache(cpu);
|
|
|
|
if (!(++guestid & GUESTID_MASK)) {
|
|
if (cpu_has_vtag_icache)
|
|
flush_icache_all();
|
|
|
|
if (!guestid) /* fix version if needed */
|
|
guestid = GUESTID_FIRST_VERSION;
|
|
|
|
++guestid; /* guestid 0 reserved for root */
|
|
|
|
/* start new guestid cycle */
|
|
kvm_vz_local_flush_roottlb_all_guests();
|
|
kvm_vz_local_flush_guesttlb_all();
|
|
}
|
|
|
|
guestid_cache(cpu) = guestid;
|
|
}
|
|
|
|
/* Returns 1 if the guest TLB may be clobbered */
|
|
static int kvm_vz_check_requests(struct kvm_vcpu *vcpu, int cpu)
|
|
{
|
|
int ret = 0;
|
|
int i;
|
|
|
|
if (!kvm_request_pending(vcpu))
|
|
return 0;
|
|
|
|
if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
|
|
if (cpu_has_guestid) {
|
|
/* Drop all GuestIDs for this VCPU */
|
|
for_each_possible_cpu(i)
|
|
vcpu->arch.vzguestid[i] = 0;
|
|
/* This will clobber guest TLB contents too */
|
|
ret = 1;
|
|
}
|
|
/*
|
|
* For Root ASID Dealias (RAD) we don't do anything here, but we
|
|
* still need the request to ensure we recheck asid_flush_mask.
|
|
* We can still return 0 as only the root TLB will be affected
|
|
* by a root ASID flush.
|
|
*/
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void kvm_vz_vcpu_save_wired(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned int wired = read_gc0_wired();
|
|
struct kvm_mips_tlb *tlbs;
|
|
int i;
|
|
|
|
/* Expand the wired TLB array if necessary */
|
|
wired &= MIPSR6_WIRED_WIRED;
|
|
if (wired > vcpu->arch.wired_tlb_limit) {
|
|
tlbs = krealloc(vcpu->arch.wired_tlb, wired *
|
|
sizeof(*vcpu->arch.wired_tlb), GFP_ATOMIC);
|
|
if (WARN_ON(!tlbs)) {
|
|
/* Save whatever we can */
|
|
wired = vcpu->arch.wired_tlb_limit;
|
|
} else {
|
|
vcpu->arch.wired_tlb = tlbs;
|
|
vcpu->arch.wired_tlb_limit = wired;
|
|
}
|
|
}
|
|
|
|
if (wired)
|
|
/* Save wired entries from the guest TLB */
|
|
kvm_vz_save_guesttlb(vcpu->arch.wired_tlb, 0, wired);
|
|
/* Invalidate any dropped entries since last time */
|
|
for (i = wired; i < vcpu->arch.wired_tlb_used; ++i) {
|
|
vcpu->arch.wired_tlb[i].tlb_hi = UNIQUE_GUEST_ENTRYHI(i);
|
|
vcpu->arch.wired_tlb[i].tlb_lo[0] = 0;
|
|
vcpu->arch.wired_tlb[i].tlb_lo[1] = 0;
|
|
vcpu->arch.wired_tlb[i].tlb_mask = 0;
|
|
}
|
|
vcpu->arch.wired_tlb_used = wired;
|
|
}
|
|
|
|
static void kvm_vz_vcpu_load_wired(struct kvm_vcpu *vcpu)
|
|
{
|
|
/* Load wired entries into the guest TLB */
|
|
if (vcpu->arch.wired_tlb)
|
|
kvm_vz_load_guesttlb(vcpu->arch.wired_tlb, 0,
|
|
vcpu->arch.wired_tlb_used);
|
|
}
|
|
|
|
static void kvm_vz_vcpu_load_tlb(struct kvm_vcpu *vcpu, int cpu)
|
|
{
|
|
struct kvm *kvm = vcpu->kvm;
|
|
struct mm_struct *gpa_mm = &kvm->arch.gpa_mm;
|
|
bool migrated;
|
|
|
|
/*
|
|
* Are we entering guest context on a different CPU to last time?
|
|
* If so, the VCPU's guest TLB state on this CPU may be stale.
|
|
*/
|
|
migrated = (vcpu->arch.last_exec_cpu != cpu);
|
|
vcpu->arch.last_exec_cpu = cpu;
|
|
|
|
/*
|
|
* A vcpu's GuestID is set in GuestCtl1.ID when the vcpu is loaded and
|
|
* remains set until another vcpu is loaded in. As a rule GuestRID
|
|
* remains zeroed when in root context unless the kernel is busy
|
|
* manipulating guest tlb entries.
|
|
*/
|
|
if (cpu_has_guestid) {
|
|
/*
|
|
* Check if our GuestID is of an older version and thus invalid.
|
|
*
|
|
* We also discard the stored GuestID if we've executed on
|
|
* another CPU, as the guest mappings may have changed without
|
|
* hypervisor knowledge.
|
|
*/
|
|
if (migrated ||
|
|
(vcpu->arch.vzguestid[cpu] ^ guestid_cache(cpu)) &
|
|
GUESTID_VERSION_MASK) {
|
|
kvm_vz_get_new_guestid(cpu, vcpu);
|
|
vcpu->arch.vzguestid[cpu] = guestid_cache(cpu);
|
|
trace_kvm_guestid_change(vcpu,
|
|
vcpu->arch.vzguestid[cpu]);
|
|
}
|
|
|
|
/* Restore GuestID */
|
|
change_c0_guestctl1(GUESTID_MASK, vcpu->arch.vzguestid[cpu]);
|
|
} else {
|
|
/*
|
|
* The Guest TLB only stores a single guest's TLB state, so
|
|
* flush it if another VCPU has executed on this CPU.
|
|
*
|
|
* We also flush if we've executed on another CPU, as the guest
|
|
* mappings may have changed without hypervisor knowledge.
|
|
*/
|
|
if (migrated || last_exec_vcpu[cpu] != vcpu)
|
|
kvm_vz_local_flush_guesttlb_all();
|
|
last_exec_vcpu[cpu] = vcpu;
|
|
|
|
/*
|
|
* Root ASID dealiases guest GPA mappings in the root TLB.
|
|
* Allocate new root ASID if needed.
|
|
*/
|
|
if (cpumask_test_and_clear_cpu(cpu, &kvm->arch.asid_flush_mask)
|
|
|| (cpu_context(cpu, gpa_mm) ^ asid_cache(cpu)) &
|
|
asid_version_mask(cpu))
|
|
get_new_mmu_context(gpa_mm, cpu);
|
|
}
|
|
}
|
|
|
|
static int kvm_vz_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
|
|
{
|
|
struct mips_coproc *cop0 = vcpu->arch.cop0;
|
|
bool migrated, all;
|
|
|
|
/*
|
|
* Have we migrated to a different CPU?
|
|
* If so, any old guest TLB state may be stale.
|
|
*/
|
|
migrated = (vcpu->arch.last_sched_cpu != cpu);
|
|
|
|
/*
|
|
* Was this the last VCPU to run on this CPU?
|
|
* If not, any old guest state from this VCPU will have been clobbered.
|
|
*/
|
|
all = migrated || (last_vcpu[cpu] != vcpu);
|
|
last_vcpu[cpu] = vcpu;
|
|
|
|
/*
|
|
* Restore CP0_Wired unconditionally as we clear it after use, and
|
|
* restore wired guest TLB entries (while in guest context).
|
|
*/
|
|
kvm_restore_gc0_wired(cop0);
|
|
if (current->flags & PF_VCPU) {
|
|
tlbw_use_hazard();
|
|
kvm_vz_vcpu_load_tlb(vcpu, cpu);
|
|
kvm_vz_vcpu_load_wired(vcpu);
|
|
}
|
|
|
|
/*
|
|
* Restore timer state regardless, as e.g. Cause.TI can change over time
|
|
* if left unmaintained.
|
|
*/
|
|
kvm_vz_restore_timer(vcpu);
|
|
|
|
/* Set MC bit if we want to trace guest mode changes */
|
|
if (kvm_trace_guest_mode_change)
|
|
set_c0_guestctl0(MIPS_GCTL0_MC);
|
|
else
|
|
clear_c0_guestctl0(MIPS_GCTL0_MC);
|
|
|
|
/* Don't bother restoring registers multiple times unless necessary */
|
|
if (!all)
|
|
return 0;
|
|
|
|
/*
|
|
* Restore config registers first, as some implementations restrict
|
|
* writes to other registers when the corresponding feature bits aren't
|
|
* set. For example Status.CU1 cannot be set unless Config1.FP is set.
|
|
*/
|
|
kvm_restore_gc0_config(cop0);
|
|
if (cpu_guest_has_conf1)
|
|
kvm_restore_gc0_config1(cop0);
|
|
if (cpu_guest_has_conf2)
|
|
kvm_restore_gc0_config2(cop0);
|
|
if (cpu_guest_has_conf3)
|
|
kvm_restore_gc0_config3(cop0);
|
|
if (cpu_guest_has_conf4)
|
|
kvm_restore_gc0_config4(cop0);
|
|
if (cpu_guest_has_conf5)
|
|
kvm_restore_gc0_config5(cop0);
|
|
if (cpu_guest_has_conf6)
|
|
kvm_restore_gc0_config6(cop0);
|
|
if (cpu_guest_has_conf7)
|
|
kvm_restore_gc0_config7(cop0);
|
|
|
|
kvm_restore_gc0_index(cop0);
|
|
kvm_restore_gc0_entrylo0(cop0);
|
|
kvm_restore_gc0_entrylo1(cop0);
|
|
kvm_restore_gc0_context(cop0);
|
|
if (cpu_guest_has_contextconfig)
|
|
kvm_restore_gc0_contextconfig(cop0);
|
|
#ifdef CONFIG_64BIT
|
|
kvm_restore_gc0_xcontext(cop0);
|
|
if (cpu_guest_has_contextconfig)
|
|
kvm_restore_gc0_xcontextconfig(cop0);
|
|
#endif
|
|
kvm_restore_gc0_pagemask(cop0);
|
|
kvm_restore_gc0_pagegrain(cop0);
|
|
kvm_restore_gc0_hwrena(cop0);
|
|
kvm_restore_gc0_badvaddr(cop0);
|
|
kvm_restore_gc0_entryhi(cop0);
|
|
kvm_restore_gc0_status(cop0);
|
|
kvm_restore_gc0_intctl(cop0);
|
|
kvm_restore_gc0_epc(cop0);
|
|
kvm_vz_write_gc0_ebase(kvm_read_sw_gc0_ebase(cop0));
|
|
if (cpu_guest_has_userlocal)
|
|
kvm_restore_gc0_userlocal(cop0);
|
|
|
|
kvm_restore_gc0_errorepc(cop0);
|
|
|
|
/* restore KScratch registers if enabled in guest */
|
|
if (cpu_guest_has_conf4) {
|
|
if (cpu_guest_has_kscr(2))
|
|
kvm_restore_gc0_kscratch1(cop0);
|
|
if (cpu_guest_has_kscr(3))
|
|
kvm_restore_gc0_kscratch2(cop0);
|
|
if (cpu_guest_has_kscr(4))
|
|
kvm_restore_gc0_kscratch3(cop0);
|
|
if (cpu_guest_has_kscr(5))
|
|
kvm_restore_gc0_kscratch4(cop0);
|
|
if (cpu_guest_has_kscr(6))
|
|
kvm_restore_gc0_kscratch5(cop0);
|
|
if (cpu_guest_has_kscr(7))
|
|
kvm_restore_gc0_kscratch6(cop0);
|
|
}
|
|
|
|
if (cpu_guest_has_badinstr)
|
|
kvm_restore_gc0_badinstr(cop0);
|
|
if (cpu_guest_has_badinstrp)
|
|
kvm_restore_gc0_badinstrp(cop0);
|
|
|
|
if (cpu_guest_has_segments) {
|
|
kvm_restore_gc0_segctl0(cop0);
|
|
kvm_restore_gc0_segctl1(cop0);
|
|
kvm_restore_gc0_segctl2(cop0);
|
|
}
|
|
|
|
/* restore HTW registers */
|
|
if (cpu_guest_has_htw) {
|
|
kvm_restore_gc0_pwbase(cop0);
|
|
kvm_restore_gc0_pwfield(cop0);
|
|
kvm_restore_gc0_pwsize(cop0);
|
|
kvm_restore_gc0_pwctl(cop0);
|
|
}
|
|
|
|
/* restore Root.GuestCtl2 from unused Guest guestctl2 register */
|
|
if (cpu_has_guestctl2)
|
|
write_c0_guestctl2(
|
|
cop0->reg[MIPS_CP0_GUESTCTL2][MIPS_CP0_GUESTCTL2_SEL]);
|
|
|
|
/*
|
|
* We should clear linked load bit to break interrupted atomics. This
|
|
* prevents a SC on the next VCPU from succeeding by matching a LL on
|
|
* the previous VCPU.
|
|
*/
|
|
if (cpu_guest_has_rw_llb)
|
|
write_gc0_lladdr(0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_vz_vcpu_put(struct kvm_vcpu *vcpu, int cpu)
|
|
{
|
|
struct mips_coproc *cop0 = vcpu->arch.cop0;
|
|
|
|
if (current->flags & PF_VCPU)
|
|
kvm_vz_vcpu_save_wired(vcpu);
|
|
|
|
kvm_lose_fpu(vcpu);
|
|
|
|
kvm_save_gc0_index(cop0);
|
|
kvm_save_gc0_entrylo0(cop0);
|
|
kvm_save_gc0_entrylo1(cop0);
|
|
kvm_save_gc0_context(cop0);
|
|
if (cpu_guest_has_contextconfig)
|
|
kvm_save_gc0_contextconfig(cop0);
|
|
#ifdef CONFIG_64BIT
|
|
kvm_save_gc0_xcontext(cop0);
|
|
if (cpu_guest_has_contextconfig)
|
|
kvm_save_gc0_xcontextconfig(cop0);
|
|
#endif
|
|
kvm_save_gc0_pagemask(cop0);
|
|
kvm_save_gc0_pagegrain(cop0);
|
|
kvm_save_gc0_wired(cop0);
|
|
/* allow wired TLB entries to be overwritten */
|
|
clear_gc0_wired(MIPSR6_WIRED_WIRED);
|
|
kvm_save_gc0_hwrena(cop0);
|
|
kvm_save_gc0_badvaddr(cop0);
|
|
kvm_save_gc0_entryhi(cop0);
|
|
kvm_save_gc0_status(cop0);
|
|
kvm_save_gc0_intctl(cop0);
|
|
kvm_save_gc0_epc(cop0);
|
|
kvm_write_sw_gc0_ebase(cop0, kvm_vz_read_gc0_ebase());
|
|
if (cpu_guest_has_userlocal)
|
|
kvm_save_gc0_userlocal(cop0);
|
|
|
|
/* only save implemented config registers */
|
|
kvm_save_gc0_config(cop0);
|
|
if (cpu_guest_has_conf1)
|
|
kvm_save_gc0_config1(cop0);
|
|
if (cpu_guest_has_conf2)
|
|
kvm_save_gc0_config2(cop0);
|
|
if (cpu_guest_has_conf3)
|
|
kvm_save_gc0_config3(cop0);
|
|
if (cpu_guest_has_conf4)
|
|
kvm_save_gc0_config4(cop0);
|
|
if (cpu_guest_has_conf5)
|
|
kvm_save_gc0_config5(cop0);
|
|
if (cpu_guest_has_conf6)
|
|
kvm_save_gc0_config6(cop0);
|
|
if (cpu_guest_has_conf7)
|
|
kvm_save_gc0_config7(cop0);
|
|
|
|
kvm_save_gc0_errorepc(cop0);
|
|
|
|
/* save KScratch registers if enabled in guest */
|
|
if (cpu_guest_has_conf4) {
|
|
if (cpu_guest_has_kscr(2))
|
|
kvm_save_gc0_kscratch1(cop0);
|
|
if (cpu_guest_has_kscr(3))
|
|
kvm_save_gc0_kscratch2(cop0);
|
|
if (cpu_guest_has_kscr(4))
|
|
kvm_save_gc0_kscratch3(cop0);
|
|
if (cpu_guest_has_kscr(5))
|
|
kvm_save_gc0_kscratch4(cop0);
|
|
if (cpu_guest_has_kscr(6))
|
|
kvm_save_gc0_kscratch5(cop0);
|
|
if (cpu_guest_has_kscr(7))
|
|
kvm_save_gc0_kscratch6(cop0);
|
|
}
|
|
|
|
if (cpu_guest_has_badinstr)
|
|
kvm_save_gc0_badinstr(cop0);
|
|
if (cpu_guest_has_badinstrp)
|
|
kvm_save_gc0_badinstrp(cop0);
|
|
|
|
if (cpu_guest_has_segments) {
|
|
kvm_save_gc0_segctl0(cop0);
|
|
kvm_save_gc0_segctl1(cop0);
|
|
kvm_save_gc0_segctl2(cop0);
|
|
}
|
|
|
|
/* save HTW registers if enabled in guest */
|
|
if (cpu_guest_has_htw &&
|
|
kvm_read_sw_gc0_config3(cop0) & MIPS_CONF3_PW) {
|
|
kvm_save_gc0_pwbase(cop0);
|
|
kvm_save_gc0_pwfield(cop0);
|
|
kvm_save_gc0_pwsize(cop0);
|
|
kvm_save_gc0_pwctl(cop0);
|
|
}
|
|
|
|
kvm_vz_save_timer(vcpu);
|
|
|
|
/* save Root.GuestCtl2 in unused Guest guestctl2 register */
|
|
if (cpu_has_guestctl2)
|
|
cop0->reg[MIPS_CP0_GUESTCTL2][MIPS_CP0_GUESTCTL2_SEL] =
|
|
read_c0_guestctl2();
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* kvm_vz_resize_guest_vtlb() - Attempt to resize guest VTLB.
|
|
* @size: Number of guest VTLB entries (0 < @size <= root VTLB entries).
|
|
*
|
|
* Attempt to resize the guest VTLB by writing guest Config registers. This is
|
|
* necessary for cores with a shared root/guest TLB to avoid overlap with wired
|
|
* entries in the root VTLB.
|
|
*
|
|
* Returns: The resulting guest VTLB size.
|
|
*/
|
|
static unsigned int kvm_vz_resize_guest_vtlb(unsigned int size)
|
|
{
|
|
unsigned int config4 = 0, ret = 0, limit;
|
|
|
|
/* Write MMUSize - 1 into guest Config registers */
|
|
if (cpu_guest_has_conf1)
|
|
change_gc0_config1(MIPS_CONF1_TLBS,
|
|
(size - 1) << MIPS_CONF1_TLBS_SHIFT);
|
|
if (cpu_guest_has_conf4) {
|
|
config4 = read_gc0_config4();
|
|
if (cpu_has_mips_r6 || (config4 & MIPS_CONF4_MMUEXTDEF) ==
|
|
MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT) {
|
|
config4 &= ~MIPS_CONF4_VTLBSIZEEXT;
|
|
config4 |= ((size - 1) >> MIPS_CONF1_TLBS_SIZE) <<
|
|
MIPS_CONF4_VTLBSIZEEXT_SHIFT;
|
|
} else if ((config4 & MIPS_CONF4_MMUEXTDEF) ==
|
|
MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT) {
|
|
config4 &= ~MIPS_CONF4_MMUSIZEEXT;
|
|
config4 |= ((size - 1) >> MIPS_CONF1_TLBS_SIZE) <<
|
|
MIPS_CONF4_MMUSIZEEXT_SHIFT;
|
|
}
|
|
write_gc0_config4(config4);
|
|
}
|
|
|
|
/*
|
|
* Set Guest.Wired.Limit = 0 (no limit up to Guest.MMUSize-1), unless it
|
|
* would exceed Root.Wired.Limit (clearing Guest.Wired.Wired so write
|
|
* not dropped)
|
|
*/
|
|
if (cpu_has_mips_r6) {
|
|
limit = (read_c0_wired() & MIPSR6_WIRED_LIMIT) >>
|
|
MIPSR6_WIRED_LIMIT_SHIFT;
|
|
if (size - 1 <= limit)
|
|
limit = 0;
|
|
write_gc0_wired(limit << MIPSR6_WIRED_LIMIT_SHIFT);
|
|
}
|
|
|
|
/* Read back MMUSize - 1 */
|
|
back_to_back_c0_hazard();
|
|
if (cpu_guest_has_conf1)
|
|
ret = (read_gc0_config1() & MIPS_CONF1_TLBS) >>
|
|
MIPS_CONF1_TLBS_SHIFT;
|
|
if (config4) {
|
|
if (cpu_has_mips_r6 || (config4 & MIPS_CONF4_MMUEXTDEF) ==
|
|
MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT)
|
|
ret |= ((config4 & MIPS_CONF4_VTLBSIZEEXT) >>
|
|
MIPS_CONF4_VTLBSIZEEXT_SHIFT) <<
|
|
MIPS_CONF1_TLBS_SIZE;
|
|
else if ((config4 & MIPS_CONF4_MMUEXTDEF) ==
|
|
MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT)
|
|
ret |= ((config4 & MIPS_CONF4_MMUSIZEEXT) >>
|
|
MIPS_CONF4_MMUSIZEEXT_SHIFT) <<
|
|
MIPS_CONF1_TLBS_SIZE;
|
|
}
|
|
return ret + 1;
|
|
}
|
|
|
|
static int kvm_vz_hardware_enable(void)
|
|
{
|
|
unsigned int mmu_size, guest_mmu_size, ftlb_size;
|
|
u64 guest_cvmctl, cvmvmconfig;
|
|
|
|
switch (current_cpu_type()) {
|
|
case CPU_CAVIUM_OCTEON3:
|
|
/* Set up guest timer/perfcount IRQ lines */
|
|
guest_cvmctl = read_gc0_cvmctl();
|
|
guest_cvmctl &= ~CVMCTL_IPTI;
|
|
guest_cvmctl |= 7ull << CVMCTL_IPTI_SHIFT;
|
|
guest_cvmctl &= ~CVMCTL_IPPCI;
|
|
guest_cvmctl |= 6ull << CVMCTL_IPPCI_SHIFT;
|
|
write_gc0_cvmctl(guest_cvmctl);
|
|
|
|
cvmvmconfig = read_c0_cvmvmconfig();
|
|
/* No I/O hole translation. */
|
|
cvmvmconfig |= CVMVMCONF_DGHT;
|
|
/* Halve the root MMU size */
|
|
mmu_size = ((cvmvmconfig & CVMVMCONF_MMUSIZEM1)
|
|
>> CVMVMCONF_MMUSIZEM1_S) + 1;
|
|
guest_mmu_size = mmu_size / 2;
|
|
mmu_size -= guest_mmu_size;
|
|
cvmvmconfig &= ~CVMVMCONF_RMMUSIZEM1;
|
|
cvmvmconfig |= mmu_size - 1;
|
|
write_c0_cvmvmconfig(cvmvmconfig);
|
|
|
|
/* Update our records */
|
|
current_cpu_data.tlbsize = mmu_size;
|
|
current_cpu_data.tlbsizevtlb = mmu_size;
|
|
current_cpu_data.guest.tlbsize = guest_mmu_size;
|
|
|
|
/* Flush moved entries in new (guest) context */
|
|
kvm_vz_local_flush_guesttlb_all();
|
|
break;
|
|
default:
|
|
/*
|
|
* ImgTec cores tend to use a shared root/guest TLB. To avoid
|
|
* overlap of root wired and guest entries, the guest TLB may
|
|
* need resizing.
|
|
*/
|
|
mmu_size = current_cpu_data.tlbsizevtlb;
|
|
ftlb_size = current_cpu_data.tlbsize - mmu_size;
|
|
|
|
/* Try switching to maximum guest VTLB size for flush */
|
|
guest_mmu_size = kvm_vz_resize_guest_vtlb(mmu_size);
|
|
current_cpu_data.guest.tlbsize = guest_mmu_size + ftlb_size;
|
|
kvm_vz_local_flush_guesttlb_all();
|
|
|
|
/*
|
|
* Reduce to make space for root wired entries and at least 2
|
|
* root non-wired entries. This does assume that long-term wired
|
|
* entries won't be added later.
|
|
*/
|
|
guest_mmu_size = mmu_size - num_wired_entries() - 2;
|
|
guest_mmu_size = kvm_vz_resize_guest_vtlb(guest_mmu_size);
|
|
current_cpu_data.guest.tlbsize = guest_mmu_size + ftlb_size;
|
|
|
|
/*
|
|
* Write the VTLB size, but if another CPU has already written,
|
|
* check it matches or we won't provide a consistent view to the
|
|
* guest. If this ever happens it suggests an asymmetric number
|
|
* of wired entries.
|
|
*/
|
|
if (cmpxchg(&kvm_vz_guest_vtlb_size, 0, guest_mmu_size) &&
|
|
WARN(guest_mmu_size != kvm_vz_guest_vtlb_size,
|
|
"Available guest VTLB size mismatch"))
|
|
return -EINVAL;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Enable virtualization features granting guest direct control of
|
|
* certain features:
|
|
* CP0=1: Guest coprocessor 0 context.
|
|
* AT=Guest: Guest MMU.
|
|
* CG=1: Hit (virtual address) CACHE operations (optional).
|
|
* CF=1: Guest Config registers.
|
|
* CGI=1: Indexed flush CACHE operations (optional).
|
|
*/
|
|
write_c0_guestctl0(MIPS_GCTL0_CP0 |
|
|
(MIPS_GCTL0_AT_GUEST << MIPS_GCTL0_AT_SHIFT) |
|
|
MIPS_GCTL0_CG | MIPS_GCTL0_CF);
|
|
if (cpu_has_guestctl0ext)
|
|
set_c0_guestctl0ext(MIPS_GCTL0EXT_CGI);
|
|
|
|
if (cpu_has_guestid) {
|
|
write_c0_guestctl1(0);
|
|
kvm_vz_local_flush_roottlb_all_guests();
|
|
|
|
GUESTID_MASK = current_cpu_data.guestid_mask;
|
|
GUESTID_FIRST_VERSION = GUESTID_MASK + 1;
|
|
GUESTID_VERSION_MASK = ~GUESTID_MASK;
|
|
|
|
current_cpu_data.guestid_cache = GUESTID_FIRST_VERSION;
|
|
}
|
|
|
|
/* clear any pending injected virtual guest interrupts */
|
|
if (cpu_has_guestctl2)
|
|
clear_c0_guestctl2(0x3f << 10);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void kvm_vz_hardware_disable(void)
|
|
{
|
|
u64 cvmvmconfig;
|
|
unsigned int mmu_size;
|
|
|
|
/* Flush any remaining guest TLB entries */
|
|
kvm_vz_local_flush_guesttlb_all();
|
|
|
|
switch (current_cpu_type()) {
|
|
case CPU_CAVIUM_OCTEON3:
|
|
/*
|
|
* Allocate whole TLB for root. Existing guest TLB entries will
|
|
* change ownership to the root TLB. We should be safe though as
|
|
* they've already been flushed above while in guest TLB.
|
|
*/
|
|
cvmvmconfig = read_c0_cvmvmconfig();
|
|
mmu_size = ((cvmvmconfig & CVMVMCONF_MMUSIZEM1)
|
|
>> CVMVMCONF_MMUSIZEM1_S) + 1;
|
|
cvmvmconfig &= ~CVMVMCONF_RMMUSIZEM1;
|
|
cvmvmconfig |= mmu_size - 1;
|
|
write_c0_cvmvmconfig(cvmvmconfig);
|
|
|
|
/* Update our records */
|
|
current_cpu_data.tlbsize = mmu_size;
|
|
current_cpu_data.tlbsizevtlb = mmu_size;
|
|
current_cpu_data.guest.tlbsize = 0;
|
|
|
|
/* Flush moved entries in new (root) context */
|
|
local_flush_tlb_all();
|
|
break;
|
|
}
|
|
|
|
if (cpu_has_guestid) {
|
|
write_c0_guestctl1(0);
|
|
kvm_vz_local_flush_roottlb_all_guests();
|
|
}
|
|
}
|
|
|
|
static int kvm_vz_check_extension(struct kvm *kvm, long ext)
|
|
{
|
|
int r;
|
|
|
|
switch (ext) {
|
|
case KVM_CAP_MIPS_VZ:
|
|
/* we wouldn't be here unless cpu_has_vz */
|
|
r = 1;
|
|
break;
|
|
#ifdef CONFIG_64BIT
|
|
case KVM_CAP_MIPS_64BIT:
|
|
/* We support 64-bit registers/operations and addresses */
|
|
r = 2;
|
|
break;
|
|
#endif
|
|
default:
|
|
r = 0;
|
|
break;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int kvm_vz_vcpu_init(struct kvm_vcpu *vcpu)
|
|
{
|
|
int i;
|
|
|
|
for_each_possible_cpu(i)
|
|
vcpu->arch.vzguestid[i] = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void kvm_vz_vcpu_uninit(struct kvm_vcpu *vcpu)
|
|
{
|
|
int cpu;
|
|
|
|
/*
|
|
* If the VCPU is freed and reused as another VCPU, we don't want the
|
|
* matching pointer wrongly hanging around in last_vcpu[] or
|
|
* last_exec_vcpu[].
|
|
*/
|
|
for_each_possible_cpu(cpu) {
|
|
if (last_vcpu[cpu] == vcpu)
|
|
last_vcpu[cpu] = NULL;
|
|
if (last_exec_vcpu[cpu] == vcpu)
|
|
last_exec_vcpu[cpu] = NULL;
|
|
}
|
|
}
|
|
|
|
static int kvm_vz_vcpu_setup(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct mips_coproc *cop0 = vcpu->arch.cop0;
|
|
unsigned long count_hz = 100*1000*1000; /* default to 100 MHz */
|
|
|
|
/*
|
|
* Start off the timer at the same frequency as the host timer, but the
|
|
* soft timer doesn't handle frequencies greater than 1GHz yet.
|
|
*/
|
|
if (mips_hpt_frequency && mips_hpt_frequency <= NSEC_PER_SEC)
|
|
count_hz = mips_hpt_frequency;
|
|
kvm_mips_init_count(vcpu, count_hz);
|
|
|
|
/*
|
|
* Initialize guest register state to valid architectural reset state.
|
|
*/
|
|
|
|
/* PageGrain */
|
|
if (cpu_has_mips_r6)
|
|
kvm_write_sw_gc0_pagegrain(cop0, PG_RIE | PG_XIE | PG_IEC);
|
|
/* Wired */
|
|
if (cpu_has_mips_r6)
|
|
kvm_write_sw_gc0_wired(cop0,
|
|
read_gc0_wired() & MIPSR6_WIRED_LIMIT);
|
|
/* Status */
|
|
kvm_write_sw_gc0_status(cop0, ST0_BEV | ST0_ERL);
|
|
if (cpu_has_mips_r6)
|
|
kvm_change_sw_gc0_status(cop0, ST0_FR, read_gc0_status());
|
|
/* IntCtl */
|
|
kvm_write_sw_gc0_intctl(cop0, read_gc0_intctl() &
|
|
(INTCTLF_IPFDC | INTCTLF_IPPCI | INTCTLF_IPTI));
|
|
/* PRId */
|
|
kvm_write_sw_gc0_prid(cop0, boot_cpu_data.processor_id);
|
|
/* EBase */
|
|
kvm_write_sw_gc0_ebase(cop0, (s32)0x80000000 | vcpu->vcpu_id);
|
|
/* Config */
|
|
kvm_save_gc0_config(cop0);
|
|
/* architecturally writable (e.g. from guest) */
|
|
kvm_change_sw_gc0_config(cop0, CONF_CM_CMASK,
|
|
_page_cachable_default >> _CACHE_SHIFT);
|
|
/* architecturally read only, but maybe writable from root */
|
|
kvm_change_sw_gc0_config(cop0, MIPS_CONF_MT, read_c0_config());
|
|
if (cpu_guest_has_conf1) {
|
|
kvm_set_sw_gc0_config(cop0, MIPS_CONF_M);
|
|
/* Config1 */
|
|
kvm_save_gc0_config1(cop0);
|
|
/* architecturally read only, but maybe writable from root */
|
|
kvm_clear_sw_gc0_config1(cop0, MIPS_CONF1_C2 |
|
|
MIPS_CONF1_MD |
|
|
MIPS_CONF1_PC |
|
|
MIPS_CONF1_WR |
|
|
MIPS_CONF1_CA |
|
|
MIPS_CONF1_FP);
|
|
}
|
|
if (cpu_guest_has_conf2) {
|
|
kvm_set_sw_gc0_config1(cop0, MIPS_CONF_M);
|
|
/* Config2 */
|
|
kvm_save_gc0_config2(cop0);
|
|
}
|
|
if (cpu_guest_has_conf3) {
|
|
kvm_set_sw_gc0_config2(cop0, MIPS_CONF_M);
|
|
/* Config3 */
|
|
kvm_save_gc0_config3(cop0);
|
|
/* architecturally writable (e.g. from guest) */
|
|
kvm_clear_sw_gc0_config3(cop0, MIPS_CONF3_ISA_OE);
|
|
/* architecturally read only, but maybe writable from root */
|
|
kvm_clear_sw_gc0_config3(cop0, MIPS_CONF3_MSA |
|
|
MIPS_CONF3_BPG |
|
|
MIPS_CONF3_ULRI |
|
|
MIPS_CONF3_DSP |
|
|
MIPS_CONF3_CTXTC |
|
|
MIPS_CONF3_ITL |
|
|
MIPS_CONF3_LPA |
|
|
MIPS_CONF3_VEIC |
|
|
MIPS_CONF3_VINT |
|
|
MIPS_CONF3_SP |
|
|
MIPS_CONF3_CDMM |
|
|
MIPS_CONF3_MT |
|
|
MIPS_CONF3_SM |
|
|
MIPS_CONF3_TL);
|
|
}
|
|
if (cpu_guest_has_conf4) {
|
|
kvm_set_sw_gc0_config3(cop0, MIPS_CONF_M);
|
|
/* Config4 */
|
|
kvm_save_gc0_config4(cop0);
|
|
}
|
|
if (cpu_guest_has_conf5) {
|
|
kvm_set_sw_gc0_config4(cop0, MIPS_CONF_M);
|
|
/* Config5 */
|
|
kvm_save_gc0_config5(cop0);
|
|
/* architecturally writable (e.g. from guest) */
|
|
kvm_clear_sw_gc0_config5(cop0, MIPS_CONF5_K |
|
|
MIPS_CONF5_CV |
|
|
MIPS_CONF5_MSAEN |
|
|
MIPS_CONF5_UFE |
|
|
MIPS_CONF5_FRE |
|
|
MIPS_CONF5_SBRI |
|
|
MIPS_CONF5_UFR);
|
|
/* architecturally read only, but maybe writable from root */
|
|
kvm_clear_sw_gc0_config5(cop0, MIPS_CONF5_MRP);
|
|
}
|
|
|
|
if (cpu_guest_has_contextconfig) {
|
|
/* ContextConfig */
|
|
kvm_write_sw_gc0_contextconfig(cop0, 0x007ffff0);
|
|
#ifdef CONFIG_64BIT
|
|
/* XContextConfig */
|
|
/* bits SEGBITS-13+3:4 set */
|
|
kvm_write_sw_gc0_xcontextconfig(cop0,
|
|
((1ull << (cpu_vmbits - 13)) - 1) << 4);
|
|
#endif
|
|
}
|
|
|
|
/* Implementation dependent, use the legacy layout */
|
|
if (cpu_guest_has_segments) {
|
|
/* SegCtl0, SegCtl1, SegCtl2 */
|
|
kvm_write_sw_gc0_segctl0(cop0, 0x00200010);
|
|
kvm_write_sw_gc0_segctl1(cop0, 0x00000002 |
|
|
(_page_cachable_default >> _CACHE_SHIFT) <<
|
|
(16 + MIPS_SEGCFG_C_SHIFT));
|
|
kvm_write_sw_gc0_segctl2(cop0, 0x00380438);
|
|
}
|
|
|
|
/* reset HTW registers */
|
|
if (cpu_guest_has_htw && cpu_has_mips_r6) {
|
|
/* PWField */
|
|
kvm_write_sw_gc0_pwfield(cop0, 0x0c30c302);
|
|
/* PWSize */
|
|
kvm_write_sw_gc0_pwsize(cop0, 1 << MIPS_PWSIZE_PTW_SHIFT);
|
|
}
|
|
|
|
/* start with no pending virtual guest interrupts */
|
|
if (cpu_has_guestctl2)
|
|
cop0->reg[MIPS_CP0_GUESTCTL2][MIPS_CP0_GUESTCTL2_SEL] = 0;
|
|
|
|
/* Put PC at reset vector */
|
|
vcpu->arch.pc = CKSEG1ADDR(0x1fc00000);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void kvm_vz_flush_shadow_all(struct kvm *kvm)
|
|
{
|
|
if (cpu_has_guestid) {
|
|
/* Flush GuestID for each VCPU individually */
|
|
kvm_flush_remote_tlbs(kvm);
|
|
} else {
|
|
/*
|
|
* For each CPU there is a single GPA ASID used by all VCPUs in
|
|
* the VM, so it doesn't make sense for the VCPUs to handle
|
|
* invalidation of these ASIDs individually.
|
|
*
|
|
* Instead mark all CPUs as needing ASID invalidation in
|
|
* asid_flush_mask, and just use kvm_flush_remote_tlbs(kvm) to
|
|
* kick any running VCPUs so they check asid_flush_mask.
|
|
*/
|
|
cpumask_setall(&kvm->arch.asid_flush_mask);
|
|
kvm_flush_remote_tlbs(kvm);
|
|
}
|
|
}
|
|
|
|
static void kvm_vz_flush_shadow_memslot(struct kvm *kvm,
|
|
const struct kvm_memory_slot *slot)
|
|
{
|
|
kvm_vz_flush_shadow_all(kvm);
|
|
}
|
|
|
|
static void kvm_vz_vcpu_reenter(struct kvm_run *run, struct kvm_vcpu *vcpu)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
int preserve_guest_tlb;
|
|
|
|
preserve_guest_tlb = kvm_vz_check_requests(vcpu, cpu);
|
|
|
|
if (preserve_guest_tlb)
|
|
kvm_vz_vcpu_save_wired(vcpu);
|
|
|
|
kvm_vz_vcpu_load_tlb(vcpu, cpu);
|
|
|
|
if (preserve_guest_tlb)
|
|
kvm_vz_vcpu_load_wired(vcpu);
|
|
}
|
|
|
|
static int kvm_vz_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
int r;
|
|
|
|
kvm_vz_acquire_htimer(vcpu);
|
|
/* Check if we have any exceptions/interrupts pending */
|
|
kvm_mips_deliver_interrupts(vcpu, read_gc0_cause());
|
|
|
|
kvm_vz_check_requests(vcpu, cpu);
|
|
kvm_vz_vcpu_load_tlb(vcpu, cpu);
|
|
kvm_vz_vcpu_load_wired(vcpu);
|
|
|
|
r = vcpu->arch.vcpu_run(run, vcpu);
|
|
|
|
kvm_vz_vcpu_save_wired(vcpu);
|
|
|
|
return r;
|
|
}
|
|
|
|
static struct kvm_mips_callbacks kvm_vz_callbacks = {
|
|
.handle_cop_unusable = kvm_trap_vz_handle_cop_unusable,
|
|
.handle_tlb_mod = kvm_trap_vz_handle_tlb_st_miss,
|
|
.handle_tlb_ld_miss = kvm_trap_vz_handle_tlb_ld_miss,
|
|
.handle_tlb_st_miss = kvm_trap_vz_handle_tlb_st_miss,
|
|
.handle_addr_err_st = kvm_trap_vz_no_handler,
|
|
.handle_addr_err_ld = kvm_trap_vz_no_handler,
|
|
.handle_syscall = kvm_trap_vz_no_handler,
|
|
.handle_res_inst = kvm_trap_vz_no_handler,
|
|
.handle_break = kvm_trap_vz_no_handler,
|
|
.handle_msa_disabled = kvm_trap_vz_handle_msa_disabled,
|
|
.handle_guest_exit = kvm_trap_vz_handle_guest_exit,
|
|
|
|
.hardware_enable = kvm_vz_hardware_enable,
|
|
.hardware_disable = kvm_vz_hardware_disable,
|
|
.check_extension = kvm_vz_check_extension,
|
|
.vcpu_init = kvm_vz_vcpu_init,
|
|
.vcpu_uninit = kvm_vz_vcpu_uninit,
|
|
.vcpu_setup = kvm_vz_vcpu_setup,
|
|
.flush_shadow_all = kvm_vz_flush_shadow_all,
|
|
.flush_shadow_memslot = kvm_vz_flush_shadow_memslot,
|
|
.gva_to_gpa = kvm_vz_gva_to_gpa_cb,
|
|
.queue_timer_int = kvm_vz_queue_timer_int_cb,
|
|
.dequeue_timer_int = kvm_vz_dequeue_timer_int_cb,
|
|
.queue_io_int = kvm_vz_queue_io_int_cb,
|
|
.dequeue_io_int = kvm_vz_dequeue_io_int_cb,
|
|
.irq_deliver = kvm_vz_irq_deliver_cb,
|
|
.irq_clear = kvm_vz_irq_clear_cb,
|
|
.num_regs = kvm_vz_num_regs,
|
|
.copy_reg_indices = kvm_vz_copy_reg_indices,
|
|
.get_one_reg = kvm_vz_get_one_reg,
|
|
.set_one_reg = kvm_vz_set_one_reg,
|
|
.vcpu_load = kvm_vz_vcpu_load,
|
|
.vcpu_put = kvm_vz_vcpu_put,
|
|
.vcpu_run = kvm_vz_vcpu_run,
|
|
.vcpu_reenter = kvm_vz_vcpu_reenter,
|
|
};
|
|
|
|
int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks)
|
|
{
|
|
if (!cpu_has_vz)
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* VZ requires at least 2 KScratch registers, so it should have been
|
|
* possible to allocate pgd_reg.
|
|
*/
|
|
if (WARN(pgd_reg == -1,
|
|
"pgd_reg not allocated even though cpu_has_vz\n"))
|
|
return -ENODEV;
|
|
|
|
pr_info("Starting KVM with MIPS VZ extensions\n");
|
|
|
|
*install_callbacks = &kvm_vz_callbacks;
|
|
return 0;
|
|
}
|