2751 lines
70 KiB
C
2751 lines
70 KiB
C
/*
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* Kernel-based Virtual Machine driver for Linux
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*
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* AMD SVM support
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*
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* Copyright (C) 2006 Qumranet, Inc.
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*
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* Authors:
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* Yaniv Kamay <yaniv@qumranet.com>
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* Avi Kivity <avi@qumranet.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include <linux/kvm_host.h>
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#include "kvm_svm.h"
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#include "irq.h"
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#include "mmu.h"
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#include "kvm_cache_regs.h"
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#include "x86.h"
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/vmalloc.h>
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#include <linux/highmem.h>
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#include <linux/sched.h>
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#include <asm/desc.h>
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#include <asm/virtext.h>
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#define __ex(x) __kvm_handle_fault_on_reboot(x)
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MODULE_AUTHOR("Qumranet");
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MODULE_LICENSE("GPL");
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#define IOPM_ALLOC_ORDER 2
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#define MSRPM_ALLOC_ORDER 1
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#define SEG_TYPE_LDT 2
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#define SEG_TYPE_BUSY_TSS16 3
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#define SVM_FEATURE_NPT (1 << 0)
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#define SVM_FEATURE_LBRV (1 << 1)
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#define SVM_FEATURE_SVML (1 << 2)
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#define DEBUGCTL_RESERVED_BITS (~(0x3fULL))
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/* Turn on to get debugging output*/
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/* #define NESTED_DEBUG */
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#ifdef NESTED_DEBUG
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#define nsvm_printk(fmt, args...) printk(KERN_INFO fmt, ## args)
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#else
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#define nsvm_printk(fmt, args...) do {} while(0)
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#endif
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/* enable NPT for AMD64 and X86 with PAE */
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#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
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static bool npt_enabled = true;
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#else
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static bool npt_enabled = false;
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#endif
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static int npt = 1;
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module_param(npt, int, S_IRUGO);
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static int nested = 0;
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module_param(nested, int, S_IRUGO);
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static void svm_flush_tlb(struct kvm_vcpu *vcpu);
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static int nested_svm_exit_handled(struct vcpu_svm *svm, bool kvm_override);
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static int nested_svm_vmexit(struct vcpu_svm *svm);
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static int nested_svm_vmsave(struct vcpu_svm *svm, void *nested_vmcb,
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void *arg2, void *opaque);
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static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
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bool has_error_code, u32 error_code);
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static inline struct vcpu_svm *to_svm(struct kvm_vcpu *vcpu)
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{
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return container_of(vcpu, struct vcpu_svm, vcpu);
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}
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static inline bool is_nested(struct vcpu_svm *svm)
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{
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return svm->nested_vmcb;
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}
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static unsigned long iopm_base;
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struct kvm_ldttss_desc {
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u16 limit0;
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u16 base0;
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unsigned base1 : 8, type : 5, dpl : 2, p : 1;
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unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8;
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u32 base3;
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u32 zero1;
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} __attribute__((packed));
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struct svm_cpu_data {
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int cpu;
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u64 asid_generation;
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u32 max_asid;
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u32 next_asid;
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struct kvm_ldttss_desc *tss_desc;
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struct page *save_area;
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};
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static DEFINE_PER_CPU(struct svm_cpu_data *, svm_data);
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static uint32_t svm_features;
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struct svm_init_data {
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int cpu;
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int r;
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};
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static u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000};
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#define NUM_MSR_MAPS ARRAY_SIZE(msrpm_ranges)
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#define MSRS_RANGE_SIZE 2048
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#define MSRS_IN_RANGE (MSRS_RANGE_SIZE * 8 / 2)
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#define MAX_INST_SIZE 15
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static inline u32 svm_has(u32 feat)
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{
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return svm_features & feat;
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}
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static inline void clgi(void)
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{
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asm volatile (__ex(SVM_CLGI));
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}
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static inline void stgi(void)
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{
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asm volatile (__ex(SVM_STGI));
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}
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static inline void invlpga(unsigned long addr, u32 asid)
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{
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asm volatile (__ex(SVM_INVLPGA) :: "a"(addr), "c"(asid));
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}
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static inline unsigned long kvm_read_cr2(void)
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{
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unsigned long cr2;
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asm volatile ("mov %%cr2, %0" : "=r" (cr2));
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return cr2;
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}
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static inline void kvm_write_cr2(unsigned long val)
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{
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asm volatile ("mov %0, %%cr2" :: "r" (val));
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}
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static inline void force_new_asid(struct kvm_vcpu *vcpu)
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{
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to_svm(vcpu)->asid_generation--;
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}
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static inline void flush_guest_tlb(struct kvm_vcpu *vcpu)
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{
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force_new_asid(vcpu);
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}
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static void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
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{
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if (!npt_enabled && !(efer & EFER_LMA))
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efer &= ~EFER_LME;
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to_svm(vcpu)->vmcb->save.efer = efer | EFER_SVME;
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vcpu->arch.shadow_efer = efer;
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}
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static void svm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
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bool has_error_code, u32 error_code)
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{
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struct vcpu_svm *svm = to_svm(vcpu);
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/* If we are within a nested VM we'd better #VMEXIT and let the
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guest handle the exception */
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if (nested_svm_check_exception(svm, nr, has_error_code, error_code))
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return;
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svm->vmcb->control.event_inj = nr
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| SVM_EVTINJ_VALID
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| (has_error_code ? SVM_EVTINJ_VALID_ERR : 0)
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| SVM_EVTINJ_TYPE_EXEPT;
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svm->vmcb->control.event_inj_err = error_code;
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}
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static int is_external_interrupt(u32 info)
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{
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info &= SVM_EVTINJ_TYPE_MASK | SVM_EVTINJ_VALID;
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return info == (SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR);
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}
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static u32 svm_get_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
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{
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struct vcpu_svm *svm = to_svm(vcpu);
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u32 ret = 0;
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if (svm->vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK)
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ret |= X86_SHADOW_INT_STI | X86_SHADOW_INT_MOV_SS;
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return ret & mask;
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}
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static void svm_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
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{
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struct vcpu_svm *svm = to_svm(vcpu);
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if (mask == 0)
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svm->vmcb->control.int_state &= ~SVM_INTERRUPT_SHADOW_MASK;
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else
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svm->vmcb->control.int_state |= SVM_INTERRUPT_SHADOW_MASK;
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}
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static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
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{
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struct vcpu_svm *svm = to_svm(vcpu);
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if (!svm->next_rip) {
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if (emulate_instruction(vcpu, vcpu->run, 0, 0, EMULTYPE_SKIP) !=
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EMULATE_DONE)
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printk(KERN_DEBUG "%s: NOP\n", __func__);
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return;
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}
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if (svm->next_rip - kvm_rip_read(vcpu) > MAX_INST_SIZE)
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printk(KERN_ERR "%s: ip 0x%lx next 0x%llx\n",
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__func__, kvm_rip_read(vcpu), svm->next_rip);
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kvm_rip_write(vcpu, svm->next_rip);
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svm_set_interrupt_shadow(vcpu, 0);
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}
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static int has_svm(void)
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{
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const char *msg;
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if (!cpu_has_svm(&msg)) {
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printk(KERN_INFO "has_svm: %s\n", msg);
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return 0;
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}
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return 1;
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}
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static void svm_hardware_disable(void *garbage)
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{
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cpu_svm_disable();
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}
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static void svm_hardware_enable(void *garbage)
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{
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struct svm_cpu_data *svm_data;
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uint64_t efer;
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struct desc_ptr gdt_descr;
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struct desc_struct *gdt;
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int me = raw_smp_processor_id();
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if (!has_svm()) {
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printk(KERN_ERR "svm_cpu_init: err EOPNOTSUPP on %d\n", me);
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return;
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}
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svm_data = per_cpu(svm_data, me);
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if (!svm_data) {
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printk(KERN_ERR "svm_cpu_init: svm_data is NULL on %d\n",
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me);
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return;
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}
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svm_data->asid_generation = 1;
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svm_data->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1;
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svm_data->next_asid = svm_data->max_asid + 1;
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asm volatile ("sgdt %0" : "=m"(gdt_descr));
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gdt = (struct desc_struct *)gdt_descr.address;
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svm_data->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS);
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rdmsrl(MSR_EFER, efer);
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wrmsrl(MSR_EFER, efer | EFER_SVME);
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wrmsrl(MSR_VM_HSAVE_PA,
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page_to_pfn(svm_data->save_area) << PAGE_SHIFT);
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}
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static void svm_cpu_uninit(int cpu)
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{
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struct svm_cpu_data *svm_data
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= per_cpu(svm_data, raw_smp_processor_id());
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if (!svm_data)
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return;
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per_cpu(svm_data, raw_smp_processor_id()) = NULL;
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__free_page(svm_data->save_area);
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kfree(svm_data);
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}
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static int svm_cpu_init(int cpu)
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{
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struct svm_cpu_data *svm_data;
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int r;
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svm_data = kzalloc(sizeof(struct svm_cpu_data), GFP_KERNEL);
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if (!svm_data)
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return -ENOMEM;
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svm_data->cpu = cpu;
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svm_data->save_area = alloc_page(GFP_KERNEL);
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r = -ENOMEM;
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if (!svm_data->save_area)
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goto err_1;
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per_cpu(svm_data, cpu) = svm_data;
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return 0;
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err_1:
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kfree(svm_data);
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return r;
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}
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static void set_msr_interception(u32 *msrpm, unsigned msr,
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int read, int write)
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{
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int i;
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for (i = 0; i < NUM_MSR_MAPS; i++) {
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if (msr >= msrpm_ranges[i] &&
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msr < msrpm_ranges[i] + MSRS_IN_RANGE) {
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u32 msr_offset = (i * MSRS_IN_RANGE + msr -
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msrpm_ranges[i]) * 2;
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u32 *base = msrpm + (msr_offset / 32);
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u32 msr_shift = msr_offset % 32;
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u32 mask = ((write) ? 0 : 2) | ((read) ? 0 : 1);
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*base = (*base & ~(0x3 << msr_shift)) |
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(mask << msr_shift);
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return;
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}
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}
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BUG();
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}
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static void svm_vcpu_init_msrpm(u32 *msrpm)
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{
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memset(msrpm, 0xff, PAGE_SIZE * (1 << MSRPM_ALLOC_ORDER));
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#ifdef CONFIG_X86_64
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set_msr_interception(msrpm, MSR_GS_BASE, 1, 1);
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set_msr_interception(msrpm, MSR_FS_BASE, 1, 1);
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set_msr_interception(msrpm, MSR_KERNEL_GS_BASE, 1, 1);
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set_msr_interception(msrpm, MSR_LSTAR, 1, 1);
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set_msr_interception(msrpm, MSR_CSTAR, 1, 1);
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set_msr_interception(msrpm, MSR_SYSCALL_MASK, 1, 1);
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#endif
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set_msr_interception(msrpm, MSR_K6_STAR, 1, 1);
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set_msr_interception(msrpm, MSR_IA32_SYSENTER_CS, 1, 1);
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set_msr_interception(msrpm, MSR_IA32_SYSENTER_ESP, 1, 1);
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set_msr_interception(msrpm, MSR_IA32_SYSENTER_EIP, 1, 1);
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}
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static void svm_enable_lbrv(struct vcpu_svm *svm)
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{
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u32 *msrpm = svm->msrpm;
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svm->vmcb->control.lbr_ctl = 1;
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set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 1, 1);
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set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1);
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set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
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set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
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}
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static void svm_disable_lbrv(struct vcpu_svm *svm)
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{
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u32 *msrpm = svm->msrpm;
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svm->vmcb->control.lbr_ctl = 0;
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set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 0, 0);
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set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 0, 0);
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set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 0, 0);
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set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 0, 0);
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}
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static __init int svm_hardware_setup(void)
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{
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int cpu;
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struct page *iopm_pages;
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void *iopm_va;
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int r;
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iopm_pages = alloc_pages(GFP_KERNEL, IOPM_ALLOC_ORDER);
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if (!iopm_pages)
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return -ENOMEM;
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iopm_va = page_address(iopm_pages);
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memset(iopm_va, 0xff, PAGE_SIZE * (1 << IOPM_ALLOC_ORDER));
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iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT;
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if (boot_cpu_has(X86_FEATURE_NX))
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kvm_enable_efer_bits(EFER_NX);
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if (boot_cpu_has(X86_FEATURE_FXSR_OPT))
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kvm_enable_efer_bits(EFER_FFXSR);
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if (nested) {
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printk(KERN_INFO "kvm: Nested Virtualization enabled\n");
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kvm_enable_efer_bits(EFER_SVME);
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}
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for_each_online_cpu(cpu) {
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r = svm_cpu_init(cpu);
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if (r)
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goto err;
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}
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svm_features = cpuid_edx(SVM_CPUID_FUNC);
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if (!svm_has(SVM_FEATURE_NPT))
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npt_enabled = false;
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if (npt_enabled && !npt) {
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printk(KERN_INFO "kvm: Nested Paging disabled\n");
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npt_enabled = false;
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}
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|
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if (npt_enabled) {
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printk(KERN_INFO "kvm: Nested Paging enabled\n");
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kvm_enable_tdp();
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} else
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kvm_disable_tdp();
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return 0;
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err:
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__free_pages(iopm_pages, IOPM_ALLOC_ORDER);
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iopm_base = 0;
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return r;
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}
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|
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static __exit void svm_hardware_unsetup(void)
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{
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int cpu;
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for_each_online_cpu(cpu)
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svm_cpu_uninit(cpu);
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__free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT), IOPM_ALLOC_ORDER);
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iopm_base = 0;
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}
|
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|
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static void init_seg(struct vmcb_seg *seg)
|
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{
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seg->selector = 0;
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seg->attrib = SVM_SELECTOR_P_MASK | SVM_SELECTOR_S_MASK |
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SVM_SELECTOR_WRITE_MASK; /* Read/Write Data Segment */
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seg->limit = 0xffff;
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seg->base = 0;
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}
|
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|
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static void init_sys_seg(struct vmcb_seg *seg, uint32_t type)
|
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{
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seg->selector = 0;
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seg->attrib = SVM_SELECTOR_P_MASK | type;
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seg->limit = 0xffff;
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seg->base = 0;
|
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}
|
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|
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static void init_vmcb(struct vcpu_svm *svm)
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{
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struct vmcb_control_area *control = &svm->vmcb->control;
|
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struct vmcb_save_area *save = &svm->vmcb->save;
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|
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control->intercept_cr_read = INTERCEPT_CR0_MASK |
|
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INTERCEPT_CR3_MASK |
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INTERCEPT_CR4_MASK;
|
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|
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control->intercept_cr_write = INTERCEPT_CR0_MASK |
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INTERCEPT_CR3_MASK |
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INTERCEPT_CR4_MASK |
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INTERCEPT_CR8_MASK;
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|
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control->intercept_dr_read = INTERCEPT_DR0_MASK |
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INTERCEPT_DR1_MASK |
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INTERCEPT_DR2_MASK |
|
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INTERCEPT_DR3_MASK;
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|
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control->intercept_dr_write = INTERCEPT_DR0_MASK |
|
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INTERCEPT_DR1_MASK |
|
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INTERCEPT_DR2_MASK |
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INTERCEPT_DR3_MASK |
|
|
INTERCEPT_DR5_MASK |
|
|
INTERCEPT_DR7_MASK;
|
|
|
|
control->intercept_exceptions = (1 << PF_VECTOR) |
|
|
(1 << UD_VECTOR) |
|
|
(1 << MC_VECTOR);
|
|
|
|
|
|
control->intercept = (1ULL << INTERCEPT_INTR) |
|
|
(1ULL << INTERCEPT_NMI) |
|
|
(1ULL << INTERCEPT_SMI) |
|
|
(1ULL << INTERCEPT_CPUID) |
|
|
(1ULL << INTERCEPT_INVD) |
|
|
(1ULL << INTERCEPT_HLT) |
|
|
(1ULL << INTERCEPT_INVLPG) |
|
|
(1ULL << INTERCEPT_INVLPGA) |
|
|
(1ULL << INTERCEPT_IOIO_PROT) |
|
|
(1ULL << INTERCEPT_MSR_PROT) |
|
|
(1ULL << INTERCEPT_TASK_SWITCH) |
|
|
(1ULL << INTERCEPT_SHUTDOWN) |
|
|
(1ULL << INTERCEPT_VMRUN) |
|
|
(1ULL << INTERCEPT_VMMCALL) |
|
|
(1ULL << INTERCEPT_VMLOAD) |
|
|
(1ULL << INTERCEPT_VMSAVE) |
|
|
(1ULL << INTERCEPT_STGI) |
|
|
(1ULL << INTERCEPT_CLGI) |
|
|
(1ULL << INTERCEPT_SKINIT) |
|
|
(1ULL << INTERCEPT_WBINVD) |
|
|
(1ULL << INTERCEPT_MONITOR) |
|
|
(1ULL << INTERCEPT_MWAIT);
|
|
|
|
control->iopm_base_pa = iopm_base;
|
|
control->msrpm_base_pa = __pa(svm->msrpm);
|
|
control->tsc_offset = 0;
|
|
control->int_ctl = V_INTR_MASKING_MASK;
|
|
|
|
init_seg(&save->es);
|
|
init_seg(&save->ss);
|
|
init_seg(&save->ds);
|
|
init_seg(&save->fs);
|
|
init_seg(&save->gs);
|
|
|
|
save->cs.selector = 0xf000;
|
|
/* Executable/Readable Code Segment */
|
|
save->cs.attrib = SVM_SELECTOR_READ_MASK | SVM_SELECTOR_P_MASK |
|
|
SVM_SELECTOR_S_MASK | SVM_SELECTOR_CODE_MASK;
|
|
save->cs.limit = 0xffff;
|
|
/*
|
|
* cs.base should really be 0xffff0000, but vmx can't handle that, so
|
|
* be consistent with it.
|
|
*
|
|
* Replace when we have real mode working for vmx.
|
|
*/
|
|
save->cs.base = 0xf0000;
|
|
|
|
save->gdtr.limit = 0xffff;
|
|
save->idtr.limit = 0xffff;
|
|
|
|
init_sys_seg(&save->ldtr, SEG_TYPE_LDT);
|
|
init_sys_seg(&save->tr, SEG_TYPE_BUSY_TSS16);
|
|
|
|
save->efer = EFER_SVME;
|
|
save->dr6 = 0xffff0ff0;
|
|
save->dr7 = 0x400;
|
|
save->rflags = 2;
|
|
save->rip = 0x0000fff0;
|
|
svm->vcpu.arch.regs[VCPU_REGS_RIP] = save->rip;
|
|
|
|
/*
|
|
* cr0 val on cpu init should be 0x60000010, we enable cpu
|
|
* cache by default. the orderly way is to enable cache in bios.
|
|
*/
|
|
save->cr0 = 0x00000010 | X86_CR0_PG | X86_CR0_WP;
|
|
save->cr4 = X86_CR4_PAE;
|
|
/* rdx = ?? */
|
|
|
|
if (npt_enabled) {
|
|
/* Setup VMCB for Nested Paging */
|
|
control->nested_ctl = 1;
|
|
control->intercept &= ~((1ULL << INTERCEPT_TASK_SWITCH) |
|
|
(1ULL << INTERCEPT_INVLPG));
|
|
control->intercept_exceptions &= ~(1 << PF_VECTOR);
|
|
control->intercept_cr_read &= ~(INTERCEPT_CR0_MASK|
|
|
INTERCEPT_CR3_MASK);
|
|
control->intercept_cr_write &= ~(INTERCEPT_CR0_MASK|
|
|
INTERCEPT_CR3_MASK);
|
|
save->g_pat = 0x0007040600070406ULL;
|
|
/* enable caching because the QEMU Bios doesn't enable it */
|
|
save->cr0 = X86_CR0_ET;
|
|
save->cr3 = 0;
|
|
save->cr4 = 0;
|
|
}
|
|
force_new_asid(&svm->vcpu);
|
|
|
|
svm->nested_vmcb = 0;
|
|
svm->vcpu.arch.hflags = HF_GIF_MASK;
|
|
}
|
|
|
|
static int svm_vcpu_reset(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
init_vmcb(svm);
|
|
|
|
if (vcpu->vcpu_id != 0) {
|
|
kvm_rip_write(vcpu, 0);
|
|
svm->vmcb->save.cs.base = svm->vcpu.arch.sipi_vector << 12;
|
|
svm->vmcb->save.cs.selector = svm->vcpu.arch.sipi_vector << 8;
|
|
}
|
|
vcpu->arch.regs_avail = ~0;
|
|
vcpu->arch.regs_dirty = ~0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
|
|
{
|
|
struct vcpu_svm *svm;
|
|
struct page *page;
|
|
struct page *msrpm_pages;
|
|
struct page *hsave_page;
|
|
struct page *nested_msrpm_pages;
|
|
int err;
|
|
|
|
svm = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
|
|
if (!svm) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
err = kvm_vcpu_init(&svm->vcpu, kvm, id);
|
|
if (err)
|
|
goto free_svm;
|
|
|
|
page = alloc_page(GFP_KERNEL);
|
|
if (!page) {
|
|
err = -ENOMEM;
|
|
goto uninit;
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
|
|
if (!msrpm_pages)
|
|
goto uninit;
|
|
|
|
nested_msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
|
|
if (!nested_msrpm_pages)
|
|
goto uninit;
|
|
|
|
svm->msrpm = page_address(msrpm_pages);
|
|
svm_vcpu_init_msrpm(svm->msrpm);
|
|
|
|
hsave_page = alloc_page(GFP_KERNEL);
|
|
if (!hsave_page)
|
|
goto uninit;
|
|
svm->hsave = page_address(hsave_page);
|
|
|
|
svm->nested_msrpm = page_address(nested_msrpm_pages);
|
|
|
|
svm->vmcb = page_address(page);
|
|
clear_page(svm->vmcb);
|
|
svm->vmcb_pa = page_to_pfn(page) << PAGE_SHIFT;
|
|
svm->asid_generation = 0;
|
|
init_vmcb(svm);
|
|
|
|
fx_init(&svm->vcpu);
|
|
svm->vcpu.fpu_active = 1;
|
|
svm->vcpu.arch.apic_base = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
|
|
if (svm->vcpu.vcpu_id == 0)
|
|
svm->vcpu.arch.apic_base |= MSR_IA32_APICBASE_BSP;
|
|
|
|
return &svm->vcpu;
|
|
|
|
uninit:
|
|
kvm_vcpu_uninit(&svm->vcpu);
|
|
free_svm:
|
|
kmem_cache_free(kvm_vcpu_cache, svm);
|
|
out:
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static void svm_free_vcpu(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
__free_page(pfn_to_page(svm->vmcb_pa >> PAGE_SHIFT));
|
|
__free_pages(virt_to_page(svm->msrpm), MSRPM_ALLOC_ORDER);
|
|
__free_page(virt_to_page(svm->hsave));
|
|
__free_pages(virt_to_page(svm->nested_msrpm), MSRPM_ALLOC_ORDER);
|
|
kvm_vcpu_uninit(vcpu);
|
|
kmem_cache_free(kvm_vcpu_cache, svm);
|
|
}
|
|
|
|
static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
int i;
|
|
|
|
if (unlikely(cpu != vcpu->cpu)) {
|
|
u64 tsc_this, delta;
|
|
|
|
/*
|
|
* Make sure that the guest sees a monotonically
|
|
* increasing TSC.
|
|
*/
|
|
rdtscll(tsc_this);
|
|
delta = vcpu->arch.host_tsc - tsc_this;
|
|
svm->vmcb->control.tsc_offset += delta;
|
|
vcpu->cpu = cpu;
|
|
kvm_migrate_timers(vcpu);
|
|
}
|
|
|
|
for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
|
|
rdmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
|
|
}
|
|
|
|
static void svm_vcpu_put(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
int i;
|
|
|
|
++vcpu->stat.host_state_reload;
|
|
for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
|
|
wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
|
|
|
|
rdtscll(vcpu->arch.host_tsc);
|
|
}
|
|
|
|
static unsigned long svm_get_rflags(struct kvm_vcpu *vcpu)
|
|
{
|
|
return to_svm(vcpu)->vmcb->save.rflags;
|
|
}
|
|
|
|
static void svm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
|
|
{
|
|
to_svm(vcpu)->vmcb->save.rflags = rflags;
|
|
}
|
|
|
|
static void svm_set_vintr(struct vcpu_svm *svm)
|
|
{
|
|
svm->vmcb->control.intercept |= 1ULL << INTERCEPT_VINTR;
|
|
}
|
|
|
|
static void svm_clear_vintr(struct vcpu_svm *svm)
|
|
{
|
|
svm->vmcb->control.intercept &= ~(1ULL << INTERCEPT_VINTR);
|
|
}
|
|
|
|
static struct vmcb_seg *svm_seg(struct kvm_vcpu *vcpu, int seg)
|
|
{
|
|
struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
|
|
|
|
switch (seg) {
|
|
case VCPU_SREG_CS: return &save->cs;
|
|
case VCPU_SREG_DS: return &save->ds;
|
|
case VCPU_SREG_ES: return &save->es;
|
|
case VCPU_SREG_FS: return &save->fs;
|
|
case VCPU_SREG_GS: return &save->gs;
|
|
case VCPU_SREG_SS: return &save->ss;
|
|
case VCPU_SREG_TR: return &save->tr;
|
|
case VCPU_SREG_LDTR: return &save->ldtr;
|
|
}
|
|
BUG();
|
|
return NULL;
|
|
}
|
|
|
|
static u64 svm_get_segment_base(struct kvm_vcpu *vcpu, int seg)
|
|
{
|
|
struct vmcb_seg *s = svm_seg(vcpu, seg);
|
|
|
|
return s->base;
|
|
}
|
|
|
|
static void svm_get_segment(struct kvm_vcpu *vcpu,
|
|
struct kvm_segment *var, int seg)
|
|
{
|
|
struct vmcb_seg *s = svm_seg(vcpu, seg);
|
|
|
|
var->base = s->base;
|
|
var->limit = s->limit;
|
|
var->selector = s->selector;
|
|
var->type = s->attrib & SVM_SELECTOR_TYPE_MASK;
|
|
var->s = (s->attrib >> SVM_SELECTOR_S_SHIFT) & 1;
|
|
var->dpl = (s->attrib >> SVM_SELECTOR_DPL_SHIFT) & 3;
|
|
var->present = (s->attrib >> SVM_SELECTOR_P_SHIFT) & 1;
|
|
var->avl = (s->attrib >> SVM_SELECTOR_AVL_SHIFT) & 1;
|
|
var->l = (s->attrib >> SVM_SELECTOR_L_SHIFT) & 1;
|
|
var->db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1;
|
|
var->g = (s->attrib >> SVM_SELECTOR_G_SHIFT) & 1;
|
|
|
|
/* AMD's VMCB does not have an explicit unusable field, so emulate it
|
|
* for cross vendor migration purposes by "not present"
|
|
*/
|
|
var->unusable = !var->present || (var->type == 0);
|
|
|
|
switch (seg) {
|
|
case VCPU_SREG_CS:
|
|
/*
|
|
* SVM always stores 0 for the 'G' bit in the CS selector in
|
|
* the VMCB on a VMEXIT. This hurts cross-vendor migration:
|
|
* Intel's VMENTRY has a check on the 'G' bit.
|
|
*/
|
|
var->g = s->limit > 0xfffff;
|
|
break;
|
|
case VCPU_SREG_TR:
|
|
/*
|
|
* Work around a bug where the busy flag in the tr selector
|
|
* isn't exposed
|
|
*/
|
|
var->type |= 0x2;
|
|
break;
|
|
case VCPU_SREG_DS:
|
|
case VCPU_SREG_ES:
|
|
case VCPU_SREG_FS:
|
|
case VCPU_SREG_GS:
|
|
/*
|
|
* The accessed bit must always be set in the segment
|
|
* descriptor cache, although it can be cleared in the
|
|
* descriptor, the cached bit always remains at 1. Since
|
|
* Intel has a check on this, set it here to support
|
|
* cross-vendor migration.
|
|
*/
|
|
if (!var->unusable)
|
|
var->type |= 0x1;
|
|
break;
|
|
case VCPU_SREG_SS:
|
|
/* On AMD CPUs sometimes the DB bit in the segment
|
|
* descriptor is left as 1, although the whole segment has
|
|
* been made unusable. Clear it here to pass an Intel VMX
|
|
* entry check when cross vendor migrating.
|
|
*/
|
|
if (var->unusable)
|
|
var->db = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int svm_get_cpl(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
|
|
|
|
return save->cpl;
|
|
}
|
|
|
|
static void svm_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
dt->limit = svm->vmcb->save.idtr.limit;
|
|
dt->base = svm->vmcb->save.idtr.base;
|
|
}
|
|
|
|
static void svm_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
svm->vmcb->save.idtr.limit = dt->limit;
|
|
svm->vmcb->save.idtr.base = dt->base ;
|
|
}
|
|
|
|
static void svm_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
dt->limit = svm->vmcb->save.gdtr.limit;
|
|
dt->base = svm->vmcb->save.gdtr.base;
|
|
}
|
|
|
|
static void svm_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
svm->vmcb->save.gdtr.limit = dt->limit;
|
|
svm->vmcb->save.gdtr.base = dt->base ;
|
|
}
|
|
|
|
static void svm_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
|
|
{
|
|
}
|
|
|
|
static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
#ifdef CONFIG_X86_64
|
|
if (vcpu->arch.shadow_efer & EFER_LME) {
|
|
if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
|
|
vcpu->arch.shadow_efer |= EFER_LMA;
|
|
svm->vmcb->save.efer |= EFER_LMA | EFER_LME;
|
|
}
|
|
|
|
if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) {
|
|
vcpu->arch.shadow_efer &= ~EFER_LMA;
|
|
svm->vmcb->save.efer &= ~(EFER_LMA | EFER_LME);
|
|
}
|
|
}
|
|
#endif
|
|
if (npt_enabled)
|
|
goto set;
|
|
|
|
if ((vcpu->arch.cr0 & X86_CR0_TS) && !(cr0 & X86_CR0_TS)) {
|
|
svm->vmcb->control.intercept_exceptions &= ~(1 << NM_VECTOR);
|
|
vcpu->fpu_active = 1;
|
|
}
|
|
|
|
vcpu->arch.cr0 = cr0;
|
|
cr0 |= X86_CR0_PG | X86_CR0_WP;
|
|
if (!vcpu->fpu_active) {
|
|
svm->vmcb->control.intercept_exceptions |= (1 << NM_VECTOR);
|
|
cr0 |= X86_CR0_TS;
|
|
}
|
|
set:
|
|
/*
|
|
* re-enable caching here because the QEMU bios
|
|
* does not do it - this results in some delay at
|
|
* reboot
|
|
*/
|
|
cr0 &= ~(X86_CR0_CD | X86_CR0_NW);
|
|
svm->vmcb->save.cr0 = cr0;
|
|
}
|
|
|
|
static void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
|
|
{
|
|
unsigned long host_cr4_mce = read_cr4() & X86_CR4_MCE;
|
|
unsigned long old_cr4 = to_svm(vcpu)->vmcb->save.cr4;
|
|
|
|
if (npt_enabled && ((old_cr4 ^ cr4) & X86_CR4_PGE))
|
|
force_new_asid(vcpu);
|
|
|
|
vcpu->arch.cr4 = cr4;
|
|
if (!npt_enabled)
|
|
cr4 |= X86_CR4_PAE;
|
|
cr4 |= host_cr4_mce;
|
|
to_svm(vcpu)->vmcb->save.cr4 = cr4;
|
|
}
|
|
|
|
static void svm_set_segment(struct kvm_vcpu *vcpu,
|
|
struct kvm_segment *var, int seg)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
struct vmcb_seg *s = svm_seg(vcpu, seg);
|
|
|
|
s->base = var->base;
|
|
s->limit = var->limit;
|
|
s->selector = var->selector;
|
|
if (var->unusable)
|
|
s->attrib = 0;
|
|
else {
|
|
s->attrib = (var->type & SVM_SELECTOR_TYPE_MASK);
|
|
s->attrib |= (var->s & 1) << SVM_SELECTOR_S_SHIFT;
|
|
s->attrib |= (var->dpl & 3) << SVM_SELECTOR_DPL_SHIFT;
|
|
s->attrib |= (var->present & 1) << SVM_SELECTOR_P_SHIFT;
|
|
s->attrib |= (var->avl & 1) << SVM_SELECTOR_AVL_SHIFT;
|
|
s->attrib |= (var->l & 1) << SVM_SELECTOR_L_SHIFT;
|
|
s->attrib |= (var->db & 1) << SVM_SELECTOR_DB_SHIFT;
|
|
s->attrib |= (var->g & 1) << SVM_SELECTOR_G_SHIFT;
|
|
}
|
|
if (seg == VCPU_SREG_CS)
|
|
svm->vmcb->save.cpl
|
|
= (svm->vmcb->save.cs.attrib
|
|
>> SVM_SELECTOR_DPL_SHIFT) & 3;
|
|
|
|
}
|
|
|
|
static void update_db_intercept(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
svm->vmcb->control.intercept_exceptions &=
|
|
~((1 << DB_VECTOR) | (1 << BP_VECTOR));
|
|
|
|
if (vcpu->arch.singlestep)
|
|
svm->vmcb->control.intercept_exceptions |= (1 << DB_VECTOR);
|
|
|
|
if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
|
|
if (vcpu->guest_debug &
|
|
(KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
|
|
svm->vmcb->control.intercept_exceptions |=
|
|
1 << DB_VECTOR;
|
|
if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
|
|
svm->vmcb->control.intercept_exceptions |=
|
|
1 << BP_VECTOR;
|
|
} else
|
|
vcpu->guest_debug = 0;
|
|
}
|
|
|
|
static int svm_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
|
|
{
|
|
int old_debug = vcpu->guest_debug;
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
vcpu->guest_debug = dbg->control;
|
|
|
|
update_db_intercept(vcpu);
|
|
|
|
if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
|
|
svm->vmcb->save.dr7 = dbg->arch.debugreg[7];
|
|
else
|
|
svm->vmcb->save.dr7 = vcpu->arch.dr7;
|
|
|
|
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
|
|
svm->vmcb->save.rflags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
|
|
else if (old_debug & KVM_GUESTDBG_SINGLESTEP)
|
|
svm->vmcb->save.rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void load_host_msrs(struct kvm_vcpu *vcpu)
|
|
{
|
|
#ifdef CONFIG_X86_64
|
|
wrmsrl(MSR_GS_BASE, to_svm(vcpu)->host_gs_base);
|
|
#endif
|
|
}
|
|
|
|
static void save_host_msrs(struct kvm_vcpu *vcpu)
|
|
{
|
|
#ifdef CONFIG_X86_64
|
|
rdmsrl(MSR_GS_BASE, to_svm(vcpu)->host_gs_base);
|
|
#endif
|
|
}
|
|
|
|
static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *svm_data)
|
|
{
|
|
if (svm_data->next_asid > svm_data->max_asid) {
|
|
++svm_data->asid_generation;
|
|
svm_data->next_asid = 1;
|
|
svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID;
|
|
}
|
|
|
|
svm->vcpu.cpu = svm_data->cpu;
|
|
svm->asid_generation = svm_data->asid_generation;
|
|
svm->vmcb->control.asid = svm_data->next_asid++;
|
|
}
|
|
|
|
static unsigned long svm_get_dr(struct kvm_vcpu *vcpu, int dr)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
unsigned long val;
|
|
|
|
switch (dr) {
|
|
case 0 ... 3:
|
|
val = vcpu->arch.db[dr];
|
|
break;
|
|
case 6:
|
|
if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
|
|
val = vcpu->arch.dr6;
|
|
else
|
|
val = svm->vmcb->save.dr6;
|
|
break;
|
|
case 7:
|
|
if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
|
|
val = vcpu->arch.dr7;
|
|
else
|
|
val = svm->vmcb->save.dr7;
|
|
break;
|
|
default:
|
|
val = 0;
|
|
}
|
|
|
|
KVMTRACE_2D(DR_READ, vcpu, (u32)dr, (u32)val, handler);
|
|
return val;
|
|
}
|
|
|
|
static void svm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long value,
|
|
int *exception)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
KVMTRACE_2D(DR_WRITE, vcpu, (u32)dr, (u32)value, handler);
|
|
|
|
*exception = 0;
|
|
|
|
switch (dr) {
|
|
case 0 ... 3:
|
|
vcpu->arch.db[dr] = value;
|
|
if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
|
|
vcpu->arch.eff_db[dr] = value;
|
|
return;
|
|
case 4 ... 5:
|
|
if (vcpu->arch.cr4 & X86_CR4_DE)
|
|
*exception = UD_VECTOR;
|
|
return;
|
|
case 6:
|
|
if (value & 0xffffffff00000000ULL) {
|
|
*exception = GP_VECTOR;
|
|
return;
|
|
}
|
|
vcpu->arch.dr6 = (value & DR6_VOLATILE) | DR6_FIXED_1;
|
|
return;
|
|
case 7:
|
|
if (value & 0xffffffff00000000ULL) {
|
|
*exception = GP_VECTOR;
|
|
return;
|
|
}
|
|
vcpu->arch.dr7 = (value & DR7_VOLATILE) | DR7_FIXED_1;
|
|
if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
|
|
svm->vmcb->save.dr7 = vcpu->arch.dr7;
|
|
vcpu->arch.switch_db_regs = (value & DR7_BP_EN_MASK);
|
|
}
|
|
return;
|
|
default:
|
|
/* FIXME: Possible case? */
|
|
printk(KERN_DEBUG "%s: unexpected dr %u\n",
|
|
__func__, dr);
|
|
*exception = UD_VECTOR;
|
|
return;
|
|
}
|
|
}
|
|
|
|
static int pf_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
u64 fault_address;
|
|
u32 error_code;
|
|
|
|
fault_address = svm->vmcb->control.exit_info_2;
|
|
error_code = svm->vmcb->control.exit_info_1;
|
|
|
|
if (!npt_enabled)
|
|
KVMTRACE_3D(PAGE_FAULT, &svm->vcpu, error_code,
|
|
(u32)fault_address, (u32)(fault_address >> 32),
|
|
handler);
|
|
else
|
|
KVMTRACE_3D(TDP_FAULT, &svm->vcpu, error_code,
|
|
(u32)fault_address, (u32)(fault_address >> 32),
|
|
handler);
|
|
/*
|
|
* FIXME: Tis shouldn't be necessary here, but there is a flush
|
|
* missing in the MMU code. Until we find this bug, flush the
|
|
* complete TLB here on an NPF
|
|
*/
|
|
if (npt_enabled)
|
|
svm_flush_tlb(&svm->vcpu);
|
|
else {
|
|
if (kvm_event_needs_reinjection(&svm->vcpu))
|
|
kvm_mmu_unprotect_page_virt(&svm->vcpu, fault_address);
|
|
}
|
|
return kvm_mmu_page_fault(&svm->vcpu, fault_address, error_code);
|
|
}
|
|
|
|
static int db_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
if (!(svm->vcpu.guest_debug &
|
|
(KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) &&
|
|
!svm->vcpu.arch.singlestep) {
|
|
kvm_queue_exception(&svm->vcpu, DB_VECTOR);
|
|
return 1;
|
|
}
|
|
|
|
if (svm->vcpu.arch.singlestep) {
|
|
svm->vcpu.arch.singlestep = false;
|
|
if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP))
|
|
svm->vmcb->save.rflags &=
|
|
~(X86_EFLAGS_TF | X86_EFLAGS_RF);
|
|
update_db_intercept(&svm->vcpu);
|
|
}
|
|
|
|
if (svm->vcpu.guest_debug &
|
|
(KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)){
|
|
kvm_run->exit_reason = KVM_EXIT_DEBUG;
|
|
kvm_run->debug.arch.pc =
|
|
svm->vmcb->save.cs.base + svm->vmcb->save.rip;
|
|
kvm_run->debug.arch.exception = DB_VECTOR;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int bp_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
kvm_run->exit_reason = KVM_EXIT_DEBUG;
|
|
kvm_run->debug.arch.pc = svm->vmcb->save.cs.base + svm->vmcb->save.rip;
|
|
kvm_run->debug.arch.exception = BP_VECTOR;
|
|
return 0;
|
|
}
|
|
|
|
static int ud_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
int er;
|
|
|
|
er = emulate_instruction(&svm->vcpu, kvm_run, 0, 0, EMULTYPE_TRAP_UD);
|
|
if (er != EMULATE_DONE)
|
|
kvm_queue_exception(&svm->vcpu, UD_VECTOR);
|
|
return 1;
|
|
}
|
|
|
|
static int nm_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
svm->vmcb->control.intercept_exceptions &= ~(1 << NM_VECTOR);
|
|
if (!(svm->vcpu.arch.cr0 & X86_CR0_TS))
|
|
svm->vmcb->save.cr0 &= ~X86_CR0_TS;
|
|
svm->vcpu.fpu_active = 1;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int mc_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
/*
|
|
* On an #MC intercept the MCE handler is not called automatically in
|
|
* the host. So do it by hand here.
|
|
*/
|
|
asm volatile (
|
|
"int $0x12\n");
|
|
/* not sure if we ever come back to this point */
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int shutdown_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
/*
|
|
* VMCB is undefined after a SHUTDOWN intercept
|
|
* so reinitialize it.
|
|
*/
|
|
clear_page(svm->vmcb);
|
|
init_vmcb(svm);
|
|
|
|
kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
|
|
return 0;
|
|
}
|
|
|
|
static int io_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */
|
|
int size, in, string;
|
|
unsigned port;
|
|
|
|
++svm->vcpu.stat.io_exits;
|
|
|
|
svm->next_rip = svm->vmcb->control.exit_info_2;
|
|
|
|
string = (io_info & SVM_IOIO_STR_MASK) != 0;
|
|
|
|
if (string) {
|
|
if (emulate_instruction(&svm->vcpu,
|
|
kvm_run, 0, 0, 0) == EMULATE_DO_MMIO)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
in = (io_info & SVM_IOIO_TYPE_MASK) != 0;
|
|
port = io_info >> 16;
|
|
size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT;
|
|
|
|
skip_emulated_instruction(&svm->vcpu);
|
|
return kvm_emulate_pio(&svm->vcpu, kvm_run, in, size, port);
|
|
}
|
|
|
|
static int nmi_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
KVMTRACE_0D(NMI, &svm->vcpu, handler);
|
|
return 1;
|
|
}
|
|
|
|
static int intr_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
++svm->vcpu.stat.irq_exits;
|
|
KVMTRACE_0D(INTR, &svm->vcpu, handler);
|
|
return 1;
|
|
}
|
|
|
|
static int nop_on_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int halt_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
svm->next_rip = kvm_rip_read(&svm->vcpu) + 1;
|
|
skip_emulated_instruction(&svm->vcpu);
|
|
return kvm_emulate_halt(&svm->vcpu);
|
|
}
|
|
|
|
static int vmmcall_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
|
|
skip_emulated_instruction(&svm->vcpu);
|
|
kvm_emulate_hypercall(&svm->vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int nested_svm_check_permissions(struct vcpu_svm *svm)
|
|
{
|
|
if (!(svm->vcpu.arch.shadow_efer & EFER_SVME)
|
|
|| !is_paging(&svm->vcpu)) {
|
|
kvm_queue_exception(&svm->vcpu, UD_VECTOR);
|
|
return 1;
|
|
}
|
|
|
|
if (svm->vmcb->save.cpl) {
|
|
kvm_inject_gp(&svm->vcpu, 0);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
|
|
bool has_error_code, u32 error_code)
|
|
{
|
|
if (is_nested(svm)) {
|
|
svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr;
|
|
svm->vmcb->control.exit_code_hi = 0;
|
|
svm->vmcb->control.exit_info_1 = error_code;
|
|
svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2;
|
|
if (nested_svm_exit_handled(svm, false)) {
|
|
nsvm_printk("VMexit -> EXCP 0x%x\n", nr);
|
|
|
|
nested_svm_vmexit(svm);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int nested_svm_intr(struct vcpu_svm *svm)
|
|
{
|
|
if (is_nested(svm)) {
|
|
if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
|
|
return 0;
|
|
|
|
if (!(svm->vcpu.arch.hflags & HF_HIF_MASK))
|
|
return 0;
|
|
|
|
svm->vmcb->control.exit_code = SVM_EXIT_INTR;
|
|
|
|
if (nested_svm_exit_handled(svm, false)) {
|
|
nsvm_printk("VMexit -> INTR\n");
|
|
nested_svm_vmexit(svm);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct page *nested_svm_get_page(struct vcpu_svm *svm, u64 gpa)
|
|
{
|
|
struct page *page;
|
|
|
|
down_read(¤t->mm->mmap_sem);
|
|
page = gfn_to_page(svm->vcpu.kvm, gpa >> PAGE_SHIFT);
|
|
up_read(¤t->mm->mmap_sem);
|
|
|
|
if (is_error_page(page)) {
|
|
printk(KERN_INFO "%s: could not find page at 0x%llx\n",
|
|
__func__, gpa);
|
|
kvm_release_page_clean(page);
|
|
kvm_inject_gp(&svm->vcpu, 0);
|
|
return NULL;
|
|
}
|
|
return page;
|
|
}
|
|
|
|
static int nested_svm_do(struct vcpu_svm *svm,
|
|
u64 arg1_gpa, u64 arg2_gpa, void *opaque,
|
|
int (*handler)(struct vcpu_svm *svm,
|
|
void *arg1,
|
|
void *arg2,
|
|
void *opaque))
|
|
{
|
|
struct page *arg1_page;
|
|
struct page *arg2_page = NULL;
|
|
void *arg1;
|
|
void *arg2 = NULL;
|
|
int retval;
|
|
|
|
arg1_page = nested_svm_get_page(svm, arg1_gpa);
|
|
if(arg1_page == NULL)
|
|
return 1;
|
|
|
|
if (arg2_gpa) {
|
|
arg2_page = nested_svm_get_page(svm, arg2_gpa);
|
|
if(arg2_page == NULL) {
|
|
kvm_release_page_clean(arg1_page);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
arg1 = kmap_atomic(arg1_page, KM_USER0);
|
|
if (arg2_gpa)
|
|
arg2 = kmap_atomic(arg2_page, KM_USER1);
|
|
|
|
retval = handler(svm, arg1, arg2, opaque);
|
|
|
|
kunmap_atomic(arg1, KM_USER0);
|
|
if (arg2_gpa)
|
|
kunmap_atomic(arg2, KM_USER1);
|
|
|
|
kvm_release_page_dirty(arg1_page);
|
|
if (arg2_gpa)
|
|
kvm_release_page_dirty(arg2_page);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int nested_svm_exit_handled_real(struct vcpu_svm *svm,
|
|
void *arg1,
|
|
void *arg2,
|
|
void *opaque)
|
|
{
|
|
struct vmcb *nested_vmcb = (struct vmcb *)arg1;
|
|
bool kvm_overrides = *(bool *)opaque;
|
|
u32 exit_code = svm->vmcb->control.exit_code;
|
|
|
|
if (kvm_overrides) {
|
|
switch (exit_code) {
|
|
case SVM_EXIT_INTR:
|
|
case SVM_EXIT_NMI:
|
|
return 0;
|
|
/* For now we are always handling NPFs when using them */
|
|
case SVM_EXIT_NPF:
|
|
if (npt_enabled)
|
|
return 0;
|
|
break;
|
|
/* When we're shadowing, trap PFs */
|
|
case SVM_EXIT_EXCP_BASE + PF_VECTOR:
|
|
if (!npt_enabled)
|
|
return 0;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
switch (exit_code) {
|
|
case SVM_EXIT_READ_CR0 ... SVM_EXIT_READ_CR8: {
|
|
u32 cr_bits = 1 << (exit_code - SVM_EXIT_READ_CR0);
|
|
if (nested_vmcb->control.intercept_cr_read & cr_bits)
|
|
return 1;
|
|
break;
|
|
}
|
|
case SVM_EXIT_WRITE_CR0 ... SVM_EXIT_WRITE_CR8: {
|
|
u32 cr_bits = 1 << (exit_code - SVM_EXIT_WRITE_CR0);
|
|
if (nested_vmcb->control.intercept_cr_write & cr_bits)
|
|
return 1;
|
|
break;
|
|
}
|
|
case SVM_EXIT_READ_DR0 ... SVM_EXIT_READ_DR7: {
|
|
u32 dr_bits = 1 << (exit_code - SVM_EXIT_READ_DR0);
|
|
if (nested_vmcb->control.intercept_dr_read & dr_bits)
|
|
return 1;
|
|
break;
|
|
}
|
|
case SVM_EXIT_WRITE_DR0 ... SVM_EXIT_WRITE_DR7: {
|
|
u32 dr_bits = 1 << (exit_code - SVM_EXIT_WRITE_DR0);
|
|
if (nested_vmcb->control.intercept_dr_write & dr_bits)
|
|
return 1;
|
|
break;
|
|
}
|
|
case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
|
|
u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE);
|
|
if (nested_vmcb->control.intercept_exceptions & excp_bits)
|
|
return 1;
|
|
break;
|
|
}
|
|
default: {
|
|
u64 exit_bits = 1ULL << (exit_code - SVM_EXIT_INTR);
|
|
nsvm_printk("exit code: 0x%x\n", exit_code);
|
|
if (nested_vmcb->control.intercept & exit_bits)
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nested_svm_exit_handled_msr(struct vcpu_svm *svm,
|
|
void *arg1, void *arg2,
|
|
void *opaque)
|
|
{
|
|
struct vmcb *nested_vmcb = (struct vmcb *)arg1;
|
|
u8 *msrpm = (u8 *)arg2;
|
|
u32 t0, t1;
|
|
u32 msr = svm->vcpu.arch.regs[VCPU_REGS_RCX];
|
|
u32 param = svm->vmcb->control.exit_info_1 & 1;
|
|
|
|
if (!(nested_vmcb->control.intercept & (1ULL << INTERCEPT_MSR_PROT)))
|
|
return 0;
|
|
|
|
switch(msr) {
|
|
case 0 ... 0x1fff:
|
|
t0 = (msr * 2) % 8;
|
|
t1 = msr / 8;
|
|
break;
|
|
case 0xc0000000 ... 0xc0001fff:
|
|
t0 = (8192 + msr - 0xc0000000) * 2;
|
|
t1 = (t0 / 8);
|
|
t0 %= 8;
|
|
break;
|
|
case 0xc0010000 ... 0xc0011fff:
|
|
t0 = (16384 + msr - 0xc0010000) * 2;
|
|
t1 = (t0 / 8);
|
|
t0 %= 8;
|
|
break;
|
|
default:
|
|
return 1;
|
|
break;
|
|
}
|
|
if (msrpm[t1] & ((1 << param) << t0))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nested_svm_exit_handled(struct vcpu_svm *svm, bool kvm_override)
|
|
{
|
|
bool k = kvm_override;
|
|
|
|
switch (svm->vmcb->control.exit_code) {
|
|
case SVM_EXIT_MSR:
|
|
return nested_svm_do(svm, svm->nested_vmcb,
|
|
svm->nested_vmcb_msrpm, NULL,
|
|
nested_svm_exit_handled_msr);
|
|
default: break;
|
|
}
|
|
|
|
return nested_svm_do(svm, svm->nested_vmcb, 0, &k,
|
|
nested_svm_exit_handled_real);
|
|
}
|
|
|
|
static int nested_svm_vmexit_real(struct vcpu_svm *svm, void *arg1,
|
|
void *arg2, void *opaque)
|
|
{
|
|
struct vmcb *nested_vmcb = (struct vmcb *)arg1;
|
|
struct vmcb *hsave = svm->hsave;
|
|
u64 nested_save[] = { nested_vmcb->save.cr0,
|
|
nested_vmcb->save.cr3,
|
|
nested_vmcb->save.cr4,
|
|
nested_vmcb->save.efer,
|
|
nested_vmcb->control.intercept_cr_read,
|
|
nested_vmcb->control.intercept_cr_write,
|
|
nested_vmcb->control.intercept_dr_read,
|
|
nested_vmcb->control.intercept_dr_write,
|
|
nested_vmcb->control.intercept_exceptions,
|
|
nested_vmcb->control.intercept,
|
|
nested_vmcb->control.msrpm_base_pa,
|
|
nested_vmcb->control.iopm_base_pa,
|
|
nested_vmcb->control.tsc_offset };
|
|
|
|
/* Give the current vmcb to the guest */
|
|
memcpy(nested_vmcb, svm->vmcb, sizeof(struct vmcb));
|
|
nested_vmcb->save.cr0 = nested_save[0];
|
|
if (!npt_enabled)
|
|
nested_vmcb->save.cr3 = nested_save[1];
|
|
nested_vmcb->save.cr4 = nested_save[2];
|
|
nested_vmcb->save.efer = nested_save[3];
|
|
nested_vmcb->control.intercept_cr_read = nested_save[4];
|
|
nested_vmcb->control.intercept_cr_write = nested_save[5];
|
|
nested_vmcb->control.intercept_dr_read = nested_save[6];
|
|
nested_vmcb->control.intercept_dr_write = nested_save[7];
|
|
nested_vmcb->control.intercept_exceptions = nested_save[8];
|
|
nested_vmcb->control.intercept = nested_save[9];
|
|
nested_vmcb->control.msrpm_base_pa = nested_save[10];
|
|
nested_vmcb->control.iopm_base_pa = nested_save[11];
|
|
nested_vmcb->control.tsc_offset = nested_save[12];
|
|
|
|
/* We always set V_INTR_MASKING and remember the old value in hflags */
|
|
if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
|
|
nested_vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
|
|
|
|
if ((nested_vmcb->control.int_ctl & V_IRQ_MASK) &&
|
|
(nested_vmcb->control.int_vector)) {
|
|
nsvm_printk("WARNING: IRQ 0x%x still enabled on #VMEXIT\n",
|
|
nested_vmcb->control.int_vector);
|
|
}
|
|
|
|
/* Restore the original control entries */
|
|
svm->vmcb->control = hsave->control;
|
|
|
|
/* Kill any pending exceptions */
|
|
if (svm->vcpu.arch.exception.pending == true)
|
|
nsvm_printk("WARNING: Pending Exception\n");
|
|
svm->vcpu.arch.exception.pending = false;
|
|
|
|
/* Restore selected save entries */
|
|
svm->vmcb->save.es = hsave->save.es;
|
|
svm->vmcb->save.cs = hsave->save.cs;
|
|
svm->vmcb->save.ss = hsave->save.ss;
|
|
svm->vmcb->save.ds = hsave->save.ds;
|
|
svm->vmcb->save.gdtr = hsave->save.gdtr;
|
|
svm->vmcb->save.idtr = hsave->save.idtr;
|
|
svm->vmcb->save.rflags = hsave->save.rflags;
|
|
svm_set_efer(&svm->vcpu, hsave->save.efer);
|
|
svm_set_cr0(&svm->vcpu, hsave->save.cr0 | X86_CR0_PE);
|
|
svm_set_cr4(&svm->vcpu, hsave->save.cr4);
|
|
if (npt_enabled) {
|
|
svm->vmcb->save.cr3 = hsave->save.cr3;
|
|
svm->vcpu.arch.cr3 = hsave->save.cr3;
|
|
} else {
|
|
kvm_set_cr3(&svm->vcpu, hsave->save.cr3);
|
|
}
|
|
kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, hsave->save.rax);
|
|
kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, hsave->save.rsp);
|
|
kvm_register_write(&svm->vcpu, VCPU_REGS_RIP, hsave->save.rip);
|
|
svm->vmcb->save.dr7 = 0;
|
|
svm->vmcb->save.cpl = 0;
|
|
svm->vmcb->control.exit_int_info = 0;
|
|
|
|
svm->vcpu.arch.hflags &= ~HF_GIF_MASK;
|
|
/* Exit nested SVM mode */
|
|
svm->nested_vmcb = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nested_svm_vmexit(struct vcpu_svm *svm)
|
|
{
|
|
nsvm_printk("VMexit\n");
|
|
if (nested_svm_do(svm, svm->nested_vmcb, 0,
|
|
NULL, nested_svm_vmexit_real))
|
|
return 1;
|
|
|
|
kvm_mmu_reset_context(&svm->vcpu);
|
|
kvm_mmu_load(&svm->vcpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nested_svm_vmrun_msrpm(struct vcpu_svm *svm, void *arg1,
|
|
void *arg2, void *opaque)
|
|
{
|
|
int i;
|
|
u32 *nested_msrpm = (u32*)arg1;
|
|
for (i=0; i< PAGE_SIZE * (1 << MSRPM_ALLOC_ORDER) / 4; i++)
|
|
svm->nested_msrpm[i] = svm->msrpm[i] | nested_msrpm[i];
|
|
svm->vmcb->control.msrpm_base_pa = __pa(svm->nested_msrpm);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nested_svm_vmrun(struct vcpu_svm *svm, void *arg1,
|
|
void *arg2, void *opaque)
|
|
{
|
|
struct vmcb *nested_vmcb = (struct vmcb *)arg1;
|
|
struct vmcb *hsave = svm->hsave;
|
|
|
|
/* nested_vmcb is our indicator if nested SVM is activated */
|
|
svm->nested_vmcb = svm->vmcb->save.rax;
|
|
|
|
/* Clear internal status */
|
|
svm->vcpu.arch.exception.pending = false;
|
|
|
|
/* Save the old vmcb, so we don't need to pick what we save, but
|
|
can restore everything when a VMEXIT occurs */
|
|
memcpy(hsave, svm->vmcb, sizeof(struct vmcb));
|
|
/* We need to remember the original CR3 in the SPT case */
|
|
if (!npt_enabled)
|
|
hsave->save.cr3 = svm->vcpu.arch.cr3;
|
|
hsave->save.cr4 = svm->vcpu.arch.cr4;
|
|
hsave->save.rip = svm->next_rip;
|
|
|
|
if (svm->vmcb->save.rflags & X86_EFLAGS_IF)
|
|
svm->vcpu.arch.hflags |= HF_HIF_MASK;
|
|
else
|
|
svm->vcpu.arch.hflags &= ~HF_HIF_MASK;
|
|
|
|
/* Load the nested guest state */
|
|
svm->vmcb->save.es = nested_vmcb->save.es;
|
|
svm->vmcb->save.cs = nested_vmcb->save.cs;
|
|
svm->vmcb->save.ss = nested_vmcb->save.ss;
|
|
svm->vmcb->save.ds = nested_vmcb->save.ds;
|
|
svm->vmcb->save.gdtr = nested_vmcb->save.gdtr;
|
|
svm->vmcb->save.idtr = nested_vmcb->save.idtr;
|
|
svm->vmcb->save.rflags = nested_vmcb->save.rflags;
|
|
svm_set_efer(&svm->vcpu, nested_vmcb->save.efer);
|
|
svm_set_cr0(&svm->vcpu, nested_vmcb->save.cr0);
|
|
svm_set_cr4(&svm->vcpu, nested_vmcb->save.cr4);
|
|
if (npt_enabled) {
|
|
svm->vmcb->save.cr3 = nested_vmcb->save.cr3;
|
|
svm->vcpu.arch.cr3 = nested_vmcb->save.cr3;
|
|
} else {
|
|
kvm_set_cr3(&svm->vcpu, nested_vmcb->save.cr3);
|
|
kvm_mmu_reset_context(&svm->vcpu);
|
|
}
|
|
svm->vmcb->save.cr2 = nested_vmcb->save.cr2;
|
|
kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, nested_vmcb->save.rax);
|
|
kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, nested_vmcb->save.rsp);
|
|
kvm_register_write(&svm->vcpu, VCPU_REGS_RIP, nested_vmcb->save.rip);
|
|
/* In case we don't even reach vcpu_run, the fields are not updated */
|
|
svm->vmcb->save.rax = nested_vmcb->save.rax;
|
|
svm->vmcb->save.rsp = nested_vmcb->save.rsp;
|
|
svm->vmcb->save.rip = nested_vmcb->save.rip;
|
|
svm->vmcb->save.dr7 = nested_vmcb->save.dr7;
|
|
svm->vmcb->save.dr6 = nested_vmcb->save.dr6;
|
|
svm->vmcb->save.cpl = nested_vmcb->save.cpl;
|
|
|
|
/* We don't want a nested guest to be more powerful than the guest,
|
|
so all intercepts are ORed */
|
|
svm->vmcb->control.intercept_cr_read |=
|
|
nested_vmcb->control.intercept_cr_read;
|
|
svm->vmcb->control.intercept_cr_write |=
|
|
nested_vmcb->control.intercept_cr_write;
|
|
svm->vmcb->control.intercept_dr_read |=
|
|
nested_vmcb->control.intercept_dr_read;
|
|
svm->vmcb->control.intercept_dr_write |=
|
|
nested_vmcb->control.intercept_dr_write;
|
|
svm->vmcb->control.intercept_exceptions |=
|
|
nested_vmcb->control.intercept_exceptions;
|
|
|
|
svm->vmcb->control.intercept |= nested_vmcb->control.intercept;
|
|
|
|
svm->nested_vmcb_msrpm = nested_vmcb->control.msrpm_base_pa;
|
|
|
|
force_new_asid(&svm->vcpu);
|
|
svm->vmcb->control.exit_int_info = nested_vmcb->control.exit_int_info;
|
|
svm->vmcb->control.exit_int_info_err = nested_vmcb->control.exit_int_info_err;
|
|
svm->vmcb->control.int_ctl = nested_vmcb->control.int_ctl | V_INTR_MASKING_MASK;
|
|
if (nested_vmcb->control.int_ctl & V_IRQ_MASK) {
|
|
nsvm_printk("nSVM Injecting Interrupt: 0x%x\n",
|
|
nested_vmcb->control.int_ctl);
|
|
}
|
|
if (nested_vmcb->control.int_ctl & V_INTR_MASKING_MASK)
|
|
svm->vcpu.arch.hflags |= HF_VINTR_MASK;
|
|
else
|
|
svm->vcpu.arch.hflags &= ~HF_VINTR_MASK;
|
|
|
|
nsvm_printk("nSVM exit_int_info: 0x%x | int_state: 0x%x\n",
|
|
nested_vmcb->control.exit_int_info,
|
|
nested_vmcb->control.int_state);
|
|
|
|
svm->vmcb->control.int_vector = nested_vmcb->control.int_vector;
|
|
svm->vmcb->control.int_state = nested_vmcb->control.int_state;
|
|
svm->vmcb->control.tsc_offset += nested_vmcb->control.tsc_offset;
|
|
if (nested_vmcb->control.event_inj & SVM_EVTINJ_VALID)
|
|
nsvm_printk("Injecting Event: 0x%x\n",
|
|
nested_vmcb->control.event_inj);
|
|
svm->vmcb->control.event_inj = nested_vmcb->control.event_inj;
|
|
svm->vmcb->control.event_inj_err = nested_vmcb->control.event_inj_err;
|
|
|
|
svm->vcpu.arch.hflags |= HF_GIF_MASK;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
|
|
{
|
|
to_vmcb->save.fs = from_vmcb->save.fs;
|
|
to_vmcb->save.gs = from_vmcb->save.gs;
|
|
to_vmcb->save.tr = from_vmcb->save.tr;
|
|
to_vmcb->save.ldtr = from_vmcb->save.ldtr;
|
|
to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base;
|
|
to_vmcb->save.star = from_vmcb->save.star;
|
|
to_vmcb->save.lstar = from_vmcb->save.lstar;
|
|
to_vmcb->save.cstar = from_vmcb->save.cstar;
|
|
to_vmcb->save.sfmask = from_vmcb->save.sfmask;
|
|
to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs;
|
|
to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp;
|
|
to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int nested_svm_vmload(struct vcpu_svm *svm, void *nested_vmcb,
|
|
void *arg2, void *opaque)
|
|
{
|
|
return nested_svm_vmloadsave((struct vmcb *)nested_vmcb, svm->vmcb);
|
|
}
|
|
|
|
static int nested_svm_vmsave(struct vcpu_svm *svm, void *nested_vmcb,
|
|
void *arg2, void *opaque)
|
|
{
|
|
return nested_svm_vmloadsave(svm->vmcb, (struct vmcb *)nested_vmcb);
|
|
}
|
|
|
|
static int vmload_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
if (nested_svm_check_permissions(svm))
|
|
return 1;
|
|
|
|
svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
|
|
skip_emulated_instruction(&svm->vcpu);
|
|
|
|
nested_svm_do(svm, svm->vmcb->save.rax, 0, NULL, nested_svm_vmload);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int vmsave_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
if (nested_svm_check_permissions(svm))
|
|
return 1;
|
|
|
|
svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
|
|
skip_emulated_instruction(&svm->vcpu);
|
|
|
|
nested_svm_do(svm, svm->vmcb->save.rax, 0, NULL, nested_svm_vmsave);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int vmrun_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
nsvm_printk("VMrun\n");
|
|
if (nested_svm_check_permissions(svm))
|
|
return 1;
|
|
|
|
svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
|
|
skip_emulated_instruction(&svm->vcpu);
|
|
|
|
if (nested_svm_do(svm, svm->vmcb->save.rax, 0,
|
|
NULL, nested_svm_vmrun))
|
|
return 1;
|
|
|
|
if (nested_svm_do(svm, svm->nested_vmcb_msrpm, 0,
|
|
NULL, nested_svm_vmrun_msrpm))
|
|
return 1;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int stgi_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
if (nested_svm_check_permissions(svm))
|
|
return 1;
|
|
|
|
svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
|
|
skip_emulated_instruction(&svm->vcpu);
|
|
|
|
svm->vcpu.arch.hflags |= HF_GIF_MASK;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int clgi_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
if (nested_svm_check_permissions(svm))
|
|
return 1;
|
|
|
|
svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
|
|
skip_emulated_instruction(&svm->vcpu);
|
|
|
|
svm->vcpu.arch.hflags &= ~HF_GIF_MASK;
|
|
|
|
/* After a CLGI no interrupts should come */
|
|
svm_clear_vintr(svm);
|
|
svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int invalid_op_interception(struct vcpu_svm *svm,
|
|
struct kvm_run *kvm_run)
|
|
{
|
|
kvm_queue_exception(&svm->vcpu, UD_VECTOR);
|
|
return 1;
|
|
}
|
|
|
|
static int task_switch_interception(struct vcpu_svm *svm,
|
|
struct kvm_run *kvm_run)
|
|
{
|
|
u16 tss_selector;
|
|
int reason;
|
|
int int_type = svm->vmcb->control.exit_int_info &
|
|
SVM_EXITINTINFO_TYPE_MASK;
|
|
int int_vec = svm->vmcb->control.exit_int_info & SVM_EVTINJ_VEC_MASK;
|
|
uint32_t type =
|
|
svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_TYPE_MASK;
|
|
uint32_t idt_v =
|
|
svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_VALID;
|
|
|
|
tss_selector = (u16)svm->vmcb->control.exit_info_1;
|
|
|
|
if (svm->vmcb->control.exit_info_2 &
|
|
(1ULL << SVM_EXITINFOSHIFT_TS_REASON_IRET))
|
|
reason = TASK_SWITCH_IRET;
|
|
else if (svm->vmcb->control.exit_info_2 &
|
|
(1ULL << SVM_EXITINFOSHIFT_TS_REASON_JMP))
|
|
reason = TASK_SWITCH_JMP;
|
|
else if (idt_v)
|
|
reason = TASK_SWITCH_GATE;
|
|
else
|
|
reason = TASK_SWITCH_CALL;
|
|
|
|
if (reason == TASK_SWITCH_GATE) {
|
|
switch (type) {
|
|
case SVM_EXITINTINFO_TYPE_NMI:
|
|
svm->vcpu.arch.nmi_injected = false;
|
|
break;
|
|
case SVM_EXITINTINFO_TYPE_EXEPT:
|
|
kvm_clear_exception_queue(&svm->vcpu);
|
|
break;
|
|
case SVM_EXITINTINFO_TYPE_INTR:
|
|
kvm_clear_interrupt_queue(&svm->vcpu);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (reason != TASK_SWITCH_GATE ||
|
|
int_type == SVM_EXITINTINFO_TYPE_SOFT ||
|
|
(int_type == SVM_EXITINTINFO_TYPE_EXEPT &&
|
|
(int_vec == OF_VECTOR || int_vec == BP_VECTOR)))
|
|
skip_emulated_instruction(&svm->vcpu);
|
|
|
|
return kvm_task_switch(&svm->vcpu, tss_selector, reason);
|
|
}
|
|
|
|
static int cpuid_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
|
|
kvm_emulate_cpuid(&svm->vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int iret_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
++svm->vcpu.stat.nmi_window_exits;
|
|
svm->vmcb->control.intercept &= ~(1UL << INTERCEPT_IRET);
|
|
svm->vcpu.arch.hflags |= HF_IRET_MASK;
|
|
return 1;
|
|
}
|
|
|
|
static int invlpg_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
if (emulate_instruction(&svm->vcpu, kvm_run, 0, 0, 0) != EMULATE_DONE)
|
|
pr_unimpl(&svm->vcpu, "%s: failed\n", __func__);
|
|
return 1;
|
|
}
|
|
|
|
static int emulate_on_interception(struct vcpu_svm *svm,
|
|
struct kvm_run *kvm_run)
|
|
{
|
|
if (emulate_instruction(&svm->vcpu, NULL, 0, 0, 0) != EMULATE_DONE)
|
|
pr_unimpl(&svm->vcpu, "%s: failed\n", __func__);
|
|
return 1;
|
|
}
|
|
|
|
static int cr8_write_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
u8 cr8_prev = kvm_get_cr8(&svm->vcpu);
|
|
/* instruction emulation calls kvm_set_cr8() */
|
|
emulate_instruction(&svm->vcpu, NULL, 0, 0, 0);
|
|
if (irqchip_in_kernel(svm->vcpu.kvm)) {
|
|
svm->vmcb->control.intercept_cr_write &= ~INTERCEPT_CR8_MASK;
|
|
return 1;
|
|
}
|
|
if (cr8_prev <= kvm_get_cr8(&svm->vcpu))
|
|
return 1;
|
|
kvm_run->exit_reason = KVM_EXIT_SET_TPR;
|
|
return 0;
|
|
}
|
|
|
|
static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
switch (ecx) {
|
|
case MSR_IA32_TIME_STAMP_COUNTER: {
|
|
u64 tsc;
|
|
|
|
rdtscll(tsc);
|
|
*data = svm->vmcb->control.tsc_offset + tsc;
|
|
break;
|
|
}
|
|
case MSR_K6_STAR:
|
|
*data = svm->vmcb->save.star;
|
|
break;
|
|
#ifdef CONFIG_X86_64
|
|
case MSR_LSTAR:
|
|
*data = svm->vmcb->save.lstar;
|
|
break;
|
|
case MSR_CSTAR:
|
|
*data = svm->vmcb->save.cstar;
|
|
break;
|
|
case MSR_KERNEL_GS_BASE:
|
|
*data = svm->vmcb->save.kernel_gs_base;
|
|
break;
|
|
case MSR_SYSCALL_MASK:
|
|
*data = svm->vmcb->save.sfmask;
|
|
break;
|
|
#endif
|
|
case MSR_IA32_SYSENTER_CS:
|
|
*data = svm->vmcb->save.sysenter_cs;
|
|
break;
|
|
case MSR_IA32_SYSENTER_EIP:
|
|
*data = svm->vmcb->save.sysenter_eip;
|
|
break;
|
|
case MSR_IA32_SYSENTER_ESP:
|
|
*data = svm->vmcb->save.sysenter_esp;
|
|
break;
|
|
/* Nobody will change the following 5 values in the VMCB so
|
|
we can safely return them on rdmsr. They will always be 0
|
|
until LBRV is implemented. */
|
|
case MSR_IA32_DEBUGCTLMSR:
|
|
*data = svm->vmcb->save.dbgctl;
|
|
break;
|
|
case MSR_IA32_LASTBRANCHFROMIP:
|
|
*data = svm->vmcb->save.br_from;
|
|
break;
|
|
case MSR_IA32_LASTBRANCHTOIP:
|
|
*data = svm->vmcb->save.br_to;
|
|
break;
|
|
case MSR_IA32_LASTINTFROMIP:
|
|
*data = svm->vmcb->save.last_excp_from;
|
|
break;
|
|
case MSR_IA32_LASTINTTOIP:
|
|
*data = svm->vmcb->save.last_excp_to;
|
|
break;
|
|
case MSR_VM_HSAVE_PA:
|
|
*data = svm->hsave_msr;
|
|
break;
|
|
case MSR_VM_CR:
|
|
*data = 0;
|
|
break;
|
|
case MSR_IA32_UCODE_REV:
|
|
*data = 0x01000065;
|
|
break;
|
|
default:
|
|
return kvm_get_msr_common(vcpu, ecx, data);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int rdmsr_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
u32 ecx = svm->vcpu.arch.regs[VCPU_REGS_RCX];
|
|
u64 data;
|
|
|
|
if (svm_get_msr(&svm->vcpu, ecx, &data))
|
|
kvm_inject_gp(&svm->vcpu, 0);
|
|
else {
|
|
KVMTRACE_3D(MSR_READ, &svm->vcpu, ecx, (u32)data,
|
|
(u32)(data >> 32), handler);
|
|
|
|
svm->vcpu.arch.regs[VCPU_REGS_RAX] = data & 0xffffffff;
|
|
svm->vcpu.arch.regs[VCPU_REGS_RDX] = data >> 32;
|
|
svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
|
|
skip_emulated_instruction(&svm->vcpu);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
switch (ecx) {
|
|
case MSR_IA32_TIME_STAMP_COUNTER: {
|
|
u64 tsc;
|
|
|
|
rdtscll(tsc);
|
|
svm->vmcb->control.tsc_offset = data - tsc;
|
|
break;
|
|
}
|
|
case MSR_K6_STAR:
|
|
svm->vmcb->save.star = data;
|
|
break;
|
|
#ifdef CONFIG_X86_64
|
|
case MSR_LSTAR:
|
|
svm->vmcb->save.lstar = data;
|
|
break;
|
|
case MSR_CSTAR:
|
|
svm->vmcb->save.cstar = data;
|
|
break;
|
|
case MSR_KERNEL_GS_BASE:
|
|
svm->vmcb->save.kernel_gs_base = data;
|
|
break;
|
|
case MSR_SYSCALL_MASK:
|
|
svm->vmcb->save.sfmask = data;
|
|
break;
|
|
#endif
|
|
case MSR_IA32_SYSENTER_CS:
|
|
svm->vmcb->save.sysenter_cs = data;
|
|
break;
|
|
case MSR_IA32_SYSENTER_EIP:
|
|
svm->vmcb->save.sysenter_eip = data;
|
|
break;
|
|
case MSR_IA32_SYSENTER_ESP:
|
|
svm->vmcb->save.sysenter_esp = data;
|
|
break;
|
|
case MSR_IA32_DEBUGCTLMSR:
|
|
if (!svm_has(SVM_FEATURE_LBRV)) {
|
|
pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTL 0x%llx, nop\n",
|
|
__func__, data);
|
|
break;
|
|
}
|
|
if (data & DEBUGCTL_RESERVED_BITS)
|
|
return 1;
|
|
|
|
svm->vmcb->save.dbgctl = data;
|
|
if (data & (1ULL<<0))
|
|
svm_enable_lbrv(svm);
|
|
else
|
|
svm_disable_lbrv(svm);
|
|
break;
|
|
case MSR_K7_EVNTSEL0:
|
|
case MSR_K7_EVNTSEL1:
|
|
case MSR_K7_EVNTSEL2:
|
|
case MSR_K7_EVNTSEL3:
|
|
case MSR_K7_PERFCTR0:
|
|
case MSR_K7_PERFCTR1:
|
|
case MSR_K7_PERFCTR2:
|
|
case MSR_K7_PERFCTR3:
|
|
/*
|
|
* Just discard all writes to the performance counters; this
|
|
* should keep both older linux and windows 64-bit guests
|
|
* happy
|
|
*/
|
|
pr_unimpl(vcpu, "unimplemented perfctr wrmsr: 0x%x data 0x%llx\n", ecx, data);
|
|
|
|
break;
|
|
case MSR_VM_HSAVE_PA:
|
|
svm->hsave_msr = data;
|
|
break;
|
|
default:
|
|
return kvm_set_msr_common(vcpu, ecx, data);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int wrmsr_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
u32 ecx = svm->vcpu.arch.regs[VCPU_REGS_RCX];
|
|
u64 data = (svm->vcpu.arch.regs[VCPU_REGS_RAX] & -1u)
|
|
| ((u64)(svm->vcpu.arch.regs[VCPU_REGS_RDX] & -1u) << 32);
|
|
|
|
KVMTRACE_3D(MSR_WRITE, &svm->vcpu, ecx, (u32)data, (u32)(data >> 32),
|
|
handler);
|
|
|
|
svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
|
|
if (svm_set_msr(&svm->vcpu, ecx, data))
|
|
kvm_inject_gp(&svm->vcpu, 0);
|
|
else
|
|
skip_emulated_instruction(&svm->vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int msr_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
|
|
{
|
|
if (svm->vmcb->control.exit_info_1)
|
|
return wrmsr_interception(svm, kvm_run);
|
|
else
|
|
return rdmsr_interception(svm, kvm_run);
|
|
}
|
|
|
|
static int interrupt_window_interception(struct vcpu_svm *svm,
|
|
struct kvm_run *kvm_run)
|
|
{
|
|
KVMTRACE_0D(PEND_INTR, &svm->vcpu, handler);
|
|
|
|
svm_clear_vintr(svm);
|
|
svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;
|
|
/*
|
|
* If the user space waits to inject interrupts, exit as soon as
|
|
* possible
|
|
*/
|
|
if (!irqchip_in_kernel(svm->vcpu.kvm) &&
|
|
kvm_run->request_interrupt_window &&
|
|
!kvm_cpu_has_interrupt(&svm->vcpu)) {
|
|
++svm->vcpu.stat.irq_window_exits;
|
|
kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int (*svm_exit_handlers[])(struct vcpu_svm *svm,
|
|
struct kvm_run *kvm_run) = {
|
|
[SVM_EXIT_READ_CR0] = emulate_on_interception,
|
|
[SVM_EXIT_READ_CR3] = emulate_on_interception,
|
|
[SVM_EXIT_READ_CR4] = emulate_on_interception,
|
|
[SVM_EXIT_READ_CR8] = emulate_on_interception,
|
|
/* for now: */
|
|
[SVM_EXIT_WRITE_CR0] = emulate_on_interception,
|
|
[SVM_EXIT_WRITE_CR3] = emulate_on_interception,
|
|
[SVM_EXIT_WRITE_CR4] = emulate_on_interception,
|
|
[SVM_EXIT_WRITE_CR8] = cr8_write_interception,
|
|
[SVM_EXIT_READ_DR0] = emulate_on_interception,
|
|
[SVM_EXIT_READ_DR1] = emulate_on_interception,
|
|
[SVM_EXIT_READ_DR2] = emulate_on_interception,
|
|
[SVM_EXIT_READ_DR3] = emulate_on_interception,
|
|
[SVM_EXIT_WRITE_DR0] = emulate_on_interception,
|
|
[SVM_EXIT_WRITE_DR1] = emulate_on_interception,
|
|
[SVM_EXIT_WRITE_DR2] = emulate_on_interception,
|
|
[SVM_EXIT_WRITE_DR3] = emulate_on_interception,
|
|
[SVM_EXIT_WRITE_DR5] = emulate_on_interception,
|
|
[SVM_EXIT_WRITE_DR7] = emulate_on_interception,
|
|
[SVM_EXIT_EXCP_BASE + DB_VECTOR] = db_interception,
|
|
[SVM_EXIT_EXCP_BASE + BP_VECTOR] = bp_interception,
|
|
[SVM_EXIT_EXCP_BASE + UD_VECTOR] = ud_interception,
|
|
[SVM_EXIT_EXCP_BASE + PF_VECTOR] = pf_interception,
|
|
[SVM_EXIT_EXCP_BASE + NM_VECTOR] = nm_interception,
|
|
[SVM_EXIT_EXCP_BASE + MC_VECTOR] = mc_interception,
|
|
[SVM_EXIT_INTR] = intr_interception,
|
|
[SVM_EXIT_NMI] = nmi_interception,
|
|
[SVM_EXIT_SMI] = nop_on_interception,
|
|
[SVM_EXIT_INIT] = nop_on_interception,
|
|
[SVM_EXIT_VINTR] = interrupt_window_interception,
|
|
/* [SVM_EXIT_CR0_SEL_WRITE] = emulate_on_interception, */
|
|
[SVM_EXIT_CPUID] = cpuid_interception,
|
|
[SVM_EXIT_IRET] = iret_interception,
|
|
[SVM_EXIT_INVD] = emulate_on_interception,
|
|
[SVM_EXIT_HLT] = halt_interception,
|
|
[SVM_EXIT_INVLPG] = invlpg_interception,
|
|
[SVM_EXIT_INVLPGA] = invalid_op_interception,
|
|
[SVM_EXIT_IOIO] = io_interception,
|
|
[SVM_EXIT_MSR] = msr_interception,
|
|
[SVM_EXIT_TASK_SWITCH] = task_switch_interception,
|
|
[SVM_EXIT_SHUTDOWN] = shutdown_interception,
|
|
[SVM_EXIT_VMRUN] = vmrun_interception,
|
|
[SVM_EXIT_VMMCALL] = vmmcall_interception,
|
|
[SVM_EXIT_VMLOAD] = vmload_interception,
|
|
[SVM_EXIT_VMSAVE] = vmsave_interception,
|
|
[SVM_EXIT_STGI] = stgi_interception,
|
|
[SVM_EXIT_CLGI] = clgi_interception,
|
|
[SVM_EXIT_SKINIT] = invalid_op_interception,
|
|
[SVM_EXIT_WBINVD] = emulate_on_interception,
|
|
[SVM_EXIT_MONITOR] = invalid_op_interception,
|
|
[SVM_EXIT_MWAIT] = invalid_op_interception,
|
|
[SVM_EXIT_NPF] = pf_interception,
|
|
};
|
|
|
|
static int handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
u32 exit_code = svm->vmcb->control.exit_code;
|
|
|
|
KVMTRACE_3D(VMEXIT, vcpu, exit_code, (u32)svm->vmcb->save.rip,
|
|
(u32)((u64)svm->vmcb->save.rip >> 32), entryexit);
|
|
|
|
if (is_nested(svm)) {
|
|
nsvm_printk("nested handle_exit: 0x%x | 0x%lx | 0x%lx | 0x%lx\n",
|
|
exit_code, svm->vmcb->control.exit_info_1,
|
|
svm->vmcb->control.exit_info_2, svm->vmcb->save.rip);
|
|
if (nested_svm_exit_handled(svm, true)) {
|
|
nested_svm_vmexit(svm);
|
|
nsvm_printk("-> #VMEXIT\n");
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (npt_enabled) {
|
|
int mmu_reload = 0;
|
|
if ((vcpu->arch.cr0 ^ svm->vmcb->save.cr0) & X86_CR0_PG) {
|
|
svm_set_cr0(vcpu, svm->vmcb->save.cr0);
|
|
mmu_reload = 1;
|
|
}
|
|
vcpu->arch.cr0 = svm->vmcb->save.cr0;
|
|
vcpu->arch.cr3 = svm->vmcb->save.cr3;
|
|
if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
|
|
if (!load_pdptrs(vcpu, vcpu->arch.cr3)) {
|
|
kvm_inject_gp(vcpu, 0);
|
|
return 1;
|
|
}
|
|
}
|
|
if (mmu_reload) {
|
|
kvm_mmu_reset_context(vcpu);
|
|
kvm_mmu_load(vcpu);
|
|
}
|
|
}
|
|
|
|
|
|
if (svm->vmcb->control.exit_code == SVM_EXIT_ERR) {
|
|
kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
|
|
kvm_run->fail_entry.hardware_entry_failure_reason
|
|
= svm->vmcb->control.exit_code;
|
|
return 0;
|
|
}
|
|
|
|
if (is_external_interrupt(svm->vmcb->control.exit_int_info) &&
|
|
exit_code != SVM_EXIT_EXCP_BASE + PF_VECTOR &&
|
|
exit_code != SVM_EXIT_NPF && exit_code != SVM_EXIT_TASK_SWITCH)
|
|
printk(KERN_ERR "%s: unexpected exit_ini_info 0x%x "
|
|
"exit_code 0x%x\n",
|
|
__func__, svm->vmcb->control.exit_int_info,
|
|
exit_code);
|
|
|
|
if (exit_code >= ARRAY_SIZE(svm_exit_handlers)
|
|
|| !svm_exit_handlers[exit_code]) {
|
|
kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
|
|
kvm_run->hw.hardware_exit_reason = exit_code;
|
|
return 0;
|
|
}
|
|
|
|
return svm_exit_handlers[exit_code](svm, kvm_run);
|
|
}
|
|
|
|
static void reload_tss(struct kvm_vcpu *vcpu)
|
|
{
|
|
int cpu = raw_smp_processor_id();
|
|
|
|
struct svm_cpu_data *svm_data = per_cpu(svm_data, cpu);
|
|
svm_data->tss_desc->type = 9; /* available 32/64-bit TSS */
|
|
load_TR_desc();
|
|
}
|
|
|
|
static void pre_svm_run(struct vcpu_svm *svm)
|
|
{
|
|
int cpu = raw_smp_processor_id();
|
|
|
|
struct svm_cpu_data *svm_data = per_cpu(svm_data, cpu);
|
|
|
|
svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;
|
|
if (svm->vcpu.cpu != cpu ||
|
|
svm->asid_generation != svm_data->asid_generation)
|
|
new_asid(svm, svm_data);
|
|
}
|
|
|
|
static void svm_inject_nmi(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
svm->vmcb->control.event_inj = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI;
|
|
vcpu->arch.hflags |= HF_NMI_MASK;
|
|
svm->vmcb->control.intercept |= (1UL << INTERCEPT_IRET);
|
|
++vcpu->stat.nmi_injections;
|
|
}
|
|
|
|
static inline void svm_inject_irq(struct vcpu_svm *svm, int irq)
|
|
{
|
|
struct vmcb_control_area *control;
|
|
|
|
KVMTRACE_1D(INJ_VIRQ, &svm->vcpu, (u32)irq, handler);
|
|
|
|
++svm->vcpu.stat.irq_injections;
|
|
control = &svm->vmcb->control;
|
|
control->int_vector = irq;
|
|
control->int_ctl &= ~V_INTR_PRIO_MASK;
|
|
control->int_ctl |= V_IRQ_MASK |
|
|
((/*control->int_vector >> 4*/ 0xf) << V_INTR_PRIO_SHIFT);
|
|
}
|
|
|
|
static void svm_queue_irq(struct kvm_vcpu *vcpu, unsigned nr)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
svm->vmcb->control.event_inj = nr |
|
|
SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR;
|
|
}
|
|
|
|
static void svm_set_irq(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
nested_svm_intr(svm);
|
|
|
|
svm_queue_irq(vcpu, vcpu->arch.interrupt.nr);
|
|
}
|
|
|
|
static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
if (irr == -1)
|
|
return;
|
|
|
|
if (tpr >= irr)
|
|
svm->vmcb->control.intercept_cr_write |= INTERCEPT_CR8_MASK;
|
|
}
|
|
|
|
static int svm_nmi_allowed(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
struct vmcb *vmcb = svm->vmcb;
|
|
return !(vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK) &&
|
|
!(svm->vcpu.arch.hflags & HF_NMI_MASK);
|
|
}
|
|
|
|
static int svm_interrupt_allowed(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
struct vmcb *vmcb = svm->vmcb;
|
|
return (vmcb->save.rflags & X86_EFLAGS_IF) &&
|
|
!(vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK) &&
|
|
(svm->vcpu.arch.hflags & HF_GIF_MASK);
|
|
}
|
|
|
|
static void enable_irq_window(struct kvm_vcpu *vcpu)
|
|
{
|
|
svm_set_vintr(to_svm(vcpu));
|
|
svm_inject_irq(to_svm(vcpu), 0x0);
|
|
}
|
|
|
|
static void enable_nmi_window(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
if ((svm->vcpu.arch.hflags & (HF_NMI_MASK | HF_IRET_MASK))
|
|
== HF_NMI_MASK)
|
|
return; /* IRET will cause a vm exit */
|
|
|
|
/* Something prevents NMI from been injected. Single step over
|
|
possible problem (IRET or exception injection or interrupt
|
|
shadow) */
|
|
vcpu->arch.singlestep = true;
|
|
svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);
|
|
update_db_intercept(vcpu);
|
|
}
|
|
|
|
static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void svm_flush_tlb(struct kvm_vcpu *vcpu)
|
|
{
|
|
force_new_asid(vcpu);
|
|
}
|
|
|
|
static void svm_prepare_guest_switch(struct kvm_vcpu *vcpu)
|
|
{
|
|
}
|
|
|
|
static inline void sync_cr8_to_lapic(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
if (!(svm->vmcb->control.intercept_cr_write & INTERCEPT_CR8_MASK)) {
|
|
int cr8 = svm->vmcb->control.int_ctl & V_TPR_MASK;
|
|
kvm_set_cr8(vcpu, cr8);
|
|
}
|
|
}
|
|
|
|
static inline void sync_lapic_to_cr8(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
u64 cr8;
|
|
|
|
cr8 = kvm_get_cr8(vcpu);
|
|
svm->vmcb->control.int_ctl &= ~V_TPR_MASK;
|
|
svm->vmcb->control.int_ctl |= cr8 & V_TPR_MASK;
|
|
}
|
|
|
|
static void svm_complete_interrupts(struct vcpu_svm *svm)
|
|
{
|
|
u8 vector;
|
|
int type;
|
|
u32 exitintinfo = svm->vmcb->control.exit_int_info;
|
|
|
|
if (svm->vcpu.arch.hflags & HF_IRET_MASK)
|
|
svm->vcpu.arch.hflags &= ~(HF_NMI_MASK | HF_IRET_MASK);
|
|
|
|
svm->vcpu.arch.nmi_injected = false;
|
|
kvm_clear_exception_queue(&svm->vcpu);
|
|
kvm_clear_interrupt_queue(&svm->vcpu);
|
|
|
|
if (!(exitintinfo & SVM_EXITINTINFO_VALID))
|
|
return;
|
|
|
|
vector = exitintinfo & SVM_EXITINTINFO_VEC_MASK;
|
|
type = exitintinfo & SVM_EXITINTINFO_TYPE_MASK;
|
|
|
|
switch (type) {
|
|
case SVM_EXITINTINFO_TYPE_NMI:
|
|
svm->vcpu.arch.nmi_injected = true;
|
|
break;
|
|
case SVM_EXITINTINFO_TYPE_EXEPT:
|
|
/* In case of software exception do not reinject an exception
|
|
vector, but re-execute and instruction instead */
|
|
if (kvm_exception_is_soft(vector))
|
|
break;
|
|
if (exitintinfo & SVM_EXITINTINFO_VALID_ERR) {
|
|
u32 err = svm->vmcb->control.exit_int_info_err;
|
|
kvm_queue_exception_e(&svm->vcpu, vector, err);
|
|
|
|
} else
|
|
kvm_queue_exception(&svm->vcpu, vector);
|
|
break;
|
|
case SVM_EXITINTINFO_TYPE_INTR:
|
|
kvm_queue_interrupt(&svm->vcpu, vector, false);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_X86_64
|
|
#define R "r"
|
|
#else
|
|
#define R "e"
|
|
#endif
|
|
|
|
static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
u16 fs_selector;
|
|
u16 gs_selector;
|
|
u16 ldt_selector;
|
|
|
|
svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX];
|
|
svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP];
|
|
svm->vmcb->save.rip = vcpu->arch.regs[VCPU_REGS_RIP];
|
|
|
|
pre_svm_run(svm);
|
|
|
|
sync_lapic_to_cr8(vcpu);
|
|
|
|
save_host_msrs(vcpu);
|
|
fs_selector = kvm_read_fs();
|
|
gs_selector = kvm_read_gs();
|
|
ldt_selector = kvm_read_ldt();
|
|
svm->host_cr2 = kvm_read_cr2();
|
|
if (!is_nested(svm))
|
|
svm->vmcb->save.cr2 = vcpu->arch.cr2;
|
|
/* required for live migration with NPT */
|
|
if (npt_enabled)
|
|
svm->vmcb->save.cr3 = vcpu->arch.cr3;
|
|
|
|
clgi();
|
|
|
|
local_irq_enable();
|
|
|
|
asm volatile (
|
|
"push %%"R"bp; \n\t"
|
|
"mov %c[rbx](%[svm]), %%"R"bx \n\t"
|
|
"mov %c[rcx](%[svm]), %%"R"cx \n\t"
|
|
"mov %c[rdx](%[svm]), %%"R"dx \n\t"
|
|
"mov %c[rsi](%[svm]), %%"R"si \n\t"
|
|
"mov %c[rdi](%[svm]), %%"R"di \n\t"
|
|
"mov %c[rbp](%[svm]), %%"R"bp \n\t"
|
|
#ifdef CONFIG_X86_64
|
|
"mov %c[r8](%[svm]), %%r8 \n\t"
|
|
"mov %c[r9](%[svm]), %%r9 \n\t"
|
|
"mov %c[r10](%[svm]), %%r10 \n\t"
|
|
"mov %c[r11](%[svm]), %%r11 \n\t"
|
|
"mov %c[r12](%[svm]), %%r12 \n\t"
|
|
"mov %c[r13](%[svm]), %%r13 \n\t"
|
|
"mov %c[r14](%[svm]), %%r14 \n\t"
|
|
"mov %c[r15](%[svm]), %%r15 \n\t"
|
|
#endif
|
|
|
|
/* Enter guest mode */
|
|
"push %%"R"ax \n\t"
|
|
"mov %c[vmcb](%[svm]), %%"R"ax \n\t"
|
|
__ex(SVM_VMLOAD) "\n\t"
|
|
__ex(SVM_VMRUN) "\n\t"
|
|
__ex(SVM_VMSAVE) "\n\t"
|
|
"pop %%"R"ax \n\t"
|
|
|
|
/* Save guest registers, load host registers */
|
|
"mov %%"R"bx, %c[rbx](%[svm]) \n\t"
|
|
"mov %%"R"cx, %c[rcx](%[svm]) \n\t"
|
|
"mov %%"R"dx, %c[rdx](%[svm]) \n\t"
|
|
"mov %%"R"si, %c[rsi](%[svm]) \n\t"
|
|
"mov %%"R"di, %c[rdi](%[svm]) \n\t"
|
|
"mov %%"R"bp, %c[rbp](%[svm]) \n\t"
|
|
#ifdef CONFIG_X86_64
|
|
"mov %%r8, %c[r8](%[svm]) \n\t"
|
|
"mov %%r9, %c[r9](%[svm]) \n\t"
|
|
"mov %%r10, %c[r10](%[svm]) \n\t"
|
|
"mov %%r11, %c[r11](%[svm]) \n\t"
|
|
"mov %%r12, %c[r12](%[svm]) \n\t"
|
|
"mov %%r13, %c[r13](%[svm]) \n\t"
|
|
"mov %%r14, %c[r14](%[svm]) \n\t"
|
|
"mov %%r15, %c[r15](%[svm]) \n\t"
|
|
#endif
|
|
"pop %%"R"bp"
|
|
:
|
|
: [svm]"a"(svm),
|
|
[vmcb]"i"(offsetof(struct vcpu_svm, vmcb_pa)),
|
|
[rbx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RBX])),
|
|
[rcx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RCX])),
|
|
[rdx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RDX])),
|
|
[rsi]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RSI])),
|
|
[rdi]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RDI])),
|
|
[rbp]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RBP]))
|
|
#ifdef CONFIG_X86_64
|
|
, [r8]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R8])),
|
|
[r9]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R9])),
|
|
[r10]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R10])),
|
|
[r11]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R11])),
|
|
[r12]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R12])),
|
|
[r13]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R13])),
|
|
[r14]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R14])),
|
|
[r15]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R15]))
|
|
#endif
|
|
: "cc", "memory"
|
|
, R"bx", R"cx", R"dx", R"si", R"di"
|
|
#ifdef CONFIG_X86_64
|
|
, "r8", "r9", "r10", "r11" , "r12", "r13", "r14", "r15"
|
|
#endif
|
|
);
|
|
|
|
vcpu->arch.cr2 = svm->vmcb->save.cr2;
|
|
vcpu->arch.regs[VCPU_REGS_RAX] = svm->vmcb->save.rax;
|
|
vcpu->arch.regs[VCPU_REGS_RSP] = svm->vmcb->save.rsp;
|
|
vcpu->arch.regs[VCPU_REGS_RIP] = svm->vmcb->save.rip;
|
|
|
|
kvm_write_cr2(svm->host_cr2);
|
|
|
|
kvm_load_fs(fs_selector);
|
|
kvm_load_gs(gs_selector);
|
|
kvm_load_ldt(ldt_selector);
|
|
load_host_msrs(vcpu);
|
|
|
|
reload_tss(vcpu);
|
|
|
|
local_irq_disable();
|
|
|
|
stgi();
|
|
|
|
sync_cr8_to_lapic(vcpu);
|
|
|
|
svm->next_rip = 0;
|
|
|
|
svm_complete_interrupts(svm);
|
|
}
|
|
|
|
#undef R
|
|
|
|
static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root)
|
|
{
|
|
struct vcpu_svm *svm = to_svm(vcpu);
|
|
|
|
if (npt_enabled) {
|
|
svm->vmcb->control.nested_cr3 = root;
|
|
force_new_asid(vcpu);
|
|
return;
|
|
}
|
|
|
|
svm->vmcb->save.cr3 = root;
|
|
force_new_asid(vcpu);
|
|
|
|
if (vcpu->fpu_active) {
|
|
svm->vmcb->control.intercept_exceptions |= (1 << NM_VECTOR);
|
|
svm->vmcb->save.cr0 |= X86_CR0_TS;
|
|
vcpu->fpu_active = 0;
|
|
}
|
|
}
|
|
|
|
static int is_disabled(void)
|
|
{
|
|
u64 vm_cr;
|
|
|
|
rdmsrl(MSR_VM_CR, vm_cr);
|
|
if (vm_cr & (1 << SVM_VM_CR_SVM_DISABLE))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
svm_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
|
|
{
|
|
/*
|
|
* Patch in the VMMCALL instruction:
|
|
*/
|
|
hypercall[0] = 0x0f;
|
|
hypercall[1] = 0x01;
|
|
hypercall[2] = 0xd9;
|
|
}
|
|
|
|
static void svm_check_processor_compat(void *rtn)
|
|
{
|
|
*(int *)rtn = 0;
|
|
}
|
|
|
|
static bool svm_cpu_has_accelerated_tpr(void)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static int get_npt_level(void)
|
|
{
|
|
#ifdef CONFIG_X86_64
|
|
return PT64_ROOT_LEVEL;
|
|
#else
|
|
return PT32E_ROOT_LEVEL;
|
|
#endif
|
|
}
|
|
|
|
static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static struct kvm_x86_ops svm_x86_ops = {
|
|
.cpu_has_kvm_support = has_svm,
|
|
.disabled_by_bios = is_disabled,
|
|
.hardware_setup = svm_hardware_setup,
|
|
.hardware_unsetup = svm_hardware_unsetup,
|
|
.check_processor_compatibility = svm_check_processor_compat,
|
|
.hardware_enable = svm_hardware_enable,
|
|
.hardware_disable = svm_hardware_disable,
|
|
.cpu_has_accelerated_tpr = svm_cpu_has_accelerated_tpr,
|
|
|
|
.vcpu_create = svm_create_vcpu,
|
|
.vcpu_free = svm_free_vcpu,
|
|
.vcpu_reset = svm_vcpu_reset,
|
|
|
|
.prepare_guest_switch = svm_prepare_guest_switch,
|
|
.vcpu_load = svm_vcpu_load,
|
|
.vcpu_put = svm_vcpu_put,
|
|
|
|
.set_guest_debug = svm_guest_debug,
|
|
.get_msr = svm_get_msr,
|
|
.set_msr = svm_set_msr,
|
|
.get_segment_base = svm_get_segment_base,
|
|
.get_segment = svm_get_segment,
|
|
.set_segment = svm_set_segment,
|
|
.get_cpl = svm_get_cpl,
|
|
.get_cs_db_l_bits = kvm_get_cs_db_l_bits,
|
|
.decache_cr4_guest_bits = svm_decache_cr4_guest_bits,
|
|
.set_cr0 = svm_set_cr0,
|
|
.set_cr3 = svm_set_cr3,
|
|
.set_cr4 = svm_set_cr4,
|
|
.set_efer = svm_set_efer,
|
|
.get_idt = svm_get_idt,
|
|
.set_idt = svm_set_idt,
|
|
.get_gdt = svm_get_gdt,
|
|
.set_gdt = svm_set_gdt,
|
|
.get_dr = svm_get_dr,
|
|
.set_dr = svm_set_dr,
|
|
.get_rflags = svm_get_rflags,
|
|
.set_rflags = svm_set_rflags,
|
|
|
|
.tlb_flush = svm_flush_tlb,
|
|
|
|
.run = svm_vcpu_run,
|
|
.handle_exit = handle_exit,
|
|
.skip_emulated_instruction = skip_emulated_instruction,
|
|
.set_interrupt_shadow = svm_set_interrupt_shadow,
|
|
.get_interrupt_shadow = svm_get_interrupt_shadow,
|
|
.patch_hypercall = svm_patch_hypercall,
|
|
.set_irq = svm_set_irq,
|
|
.set_nmi = svm_inject_nmi,
|
|
.queue_exception = svm_queue_exception,
|
|
.interrupt_allowed = svm_interrupt_allowed,
|
|
.nmi_allowed = svm_nmi_allowed,
|
|
.enable_nmi_window = enable_nmi_window,
|
|
.enable_irq_window = enable_irq_window,
|
|
.update_cr8_intercept = update_cr8_intercept,
|
|
|
|
.set_tss_addr = svm_set_tss_addr,
|
|
.get_tdp_level = get_npt_level,
|
|
.get_mt_mask = svm_get_mt_mask,
|
|
};
|
|
|
|
static int __init svm_init(void)
|
|
{
|
|
return kvm_init(&svm_x86_ops, sizeof(struct vcpu_svm),
|
|
THIS_MODULE);
|
|
}
|
|
|
|
static void __exit svm_exit(void)
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{
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kvm_exit();
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}
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module_init(svm_init)
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module_exit(svm_exit)
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