mirror of https://gitee.com/openkylin/linux.git
1675 lines
41 KiB
C
1675 lines
41 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* KVM/MIPS: MIPS specific KVM APIs
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*
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* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
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* Authors: Sanjay Lal <sanjayl@kymasys.com>
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*/
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#include <linux/bitops.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/kdebug.h>
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <linux/vmalloc.h>
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#include <linux/sched/signal.h>
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#include <linux/fs.h>
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#include <linux/bootmem.h>
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#include <asm/fpu.h>
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#include <asm/page.h>
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#include <asm/cacheflush.h>
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#include <asm/mmu_context.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <linux/kvm_host.h>
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#include "interrupt.h"
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#include "commpage.h"
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#define CREATE_TRACE_POINTS
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#include "trace.h"
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#ifndef VECTORSPACING
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#define VECTORSPACING 0x100 /* for EI/VI mode */
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#endif
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#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x)
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struct kvm_stats_debugfs_item debugfs_entries[] = {
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{ "wait", VCPU_STAT(wait_exits), KVM_STAT_VCPU },
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{ "cache", VCPU_STAT(cache_exits), KVM_STAT_VCPU },
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{ "signal", VCPU_STAT(signal_exits), KVM_STAT_VCPU },
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{ "interrupt", VCPU_STAT(int_exits), KVM_STAT_VCPU },
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{ "cop_unsuable", VCPU_STAT(cop_unusable_exits), KVM_STAT_VCPU },
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{ "tlbmod", VCPU_STAT(tlbmod_exits), KVM_STAT_VCPU },
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{ "tlbmiss_ld", VCPU_STAT(tlbmiss_ld_exits), KVM_STAT_VCPU },
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{ "tlbmiss_st", VCPU_STAT(tlbmiss_st_exits), KVM_STAT_VCPU },
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{ "addrerr_st", VCPU_STAT(addrerr_st_exits), KVM_STAT_VCPU },
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{ "addrerr_ld", VCPU_STAT(addrerr_ld_exits), KVM_STAT_VCPU },
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{ "syscall", VCPU_STAT(syscall_exits), KVM_STAT_VCPU },
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{ "resvd_inst", VCPU_STAT(resvd_inst_exits), KVM_STAT_VCPU },
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{ "break_inst", VCPU_STAT(break_inst_exits), KVM_STAT_VCPU },
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{ "trap_inst", VCPU_STAT(trap_inst_exits), KVM_STAT_VCPU },
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{ "msa_fpe", VCPU_STAT(msa_fpe_exits), KVM_STAT_VCPU },
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{ "fpe", VCPU_STAT(fpe_exits), KVM_STAT_VCPU },
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{ "msa_disabled", VCPU_STAT(msa_disabled_exits), KVM_STAT_VCPU },
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{ "flush_dcache", VCPU_STAT(flush_dcache_exits), KVM_STAT_VCPU },
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#ifdef CONFIG_KVM_MIPS_VZ
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{ "vz_gpsi", VCPU_STAT(vz_gpsi_exits), KVM_STAT_VCPU },
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{ "vz_gsfc", VCPU_STAT(vz_gsfc_exits), KVM_STAT_VCPU },
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{ "vz_hc", VCPU_STAT(vz_hc_exits), KVM_STAT_VCPU },
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{ "vz_grr", VCPU_STAT(vz_grr_exits), KVM_STAT_VCPU },
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{ "vz_gva", VCPU_STAT(vz_gva_exits), KVM_STAT_VCPU },
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{ "vz_ghfc", VCPU_STAT(vz_ghfc_exits), KVM_STAT_VCPU },
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{ "vz_gpa", VCPU_STAT(vz_gpa_exits), KVM_STAT_VCPU },
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{ "vz_resvd", VCPU_STAT(vz_resvd_exits), KVM_STAT_VCPU },
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#endif
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{ "halt_successful_poll", VCPU_STAT(halt_successful_poll), KVM_STAT_VCPU },
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{ "halt_attempted_poll", VCPU_STAT(halt_attempted_poll), KVM_STAT_VCPU },
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{ "halt_poll_invalid", VCPU_STAT(halt_poll_invalid), KVM_STAT_VCPU },
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{ "halt_wakeup", VCPU_STAT(halt_wakeup), KVM_STAT_VCPU },
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{NULL}
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};
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/*
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* XXXKYMA: We are simulatoring a processor that has the WII bit set in
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* Config7, so we are "runnable" if interrupts are pending
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*/
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int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
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{
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return !!(vcpu->arch.pending_exceptions);
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}
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int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
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{
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return 1;
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}
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int kvm_arch_hardware_enable(void)
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{
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return kvm_mips_callbacks->hardware_enable();
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}
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void kvm_arch_hardware_disable(void)
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{
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kvm_mips_callbacks->hardware_disable();
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}
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int kvm_arch_hardware_setup(void)
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{
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return 0;
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}
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void kvm_arch_check_processor_compat(void *rtn)
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{
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*(int *)rtn = 0;
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}
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int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
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{
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switch (type) {
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case KVM_VM_MIPS_TE:
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break;
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default:
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/* Unsupported KVM type */
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return -EINVAL;
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};
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/* Allocate page table to map GPA -> RPA */
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kvm->arch.gpa_mm.pgd = kvm_pgd_alloc();
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if (!kvm->arch.gpa_mm.pgd)
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return -ENOMEM;
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return 0;
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}
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bool kvm_arch_has_vcpu_debugfs(void)
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{
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return false;
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}
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int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
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{
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return 0;
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}
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void kvm_mips_free_vcpus(struct kvm *kvm)
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{
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unsigned int i;
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struct kvm_vcpu *vcpu;
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kvm_for_each_vcpu(i, vcpu, kvm) {
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kvm_arch_vcpu_free(vcpu);
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}
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mutex_lock(&kvm->lock);
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for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
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kvm->vcpus[i] = NULL;
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atomic_set(&kvm->online_vcpus, 0);
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mutex_unlock(&kvm->lock);
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}
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static void kvm_mips_free_gpa_pt(struct kvm *kvm)
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{
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/* It should always be safe to remove after flushing the whole range */
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WARN_ON(!kvm_mips_flush_gpa_pt(kvm, 0, ~0));
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pgd_free(NULL, kvm->arch.gpa_mm.pgd);
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}
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void kvm_arch_destroy_vm(struct kvm *kvm)
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{
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kvm_mips_free_vcpus(kvm);
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kvm_mips_free_gpa_pt(kvm);
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}
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long kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl,
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unsigned long arg)
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{
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return -ENOIOCTLCMD;
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}
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int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
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unsigned long npages)
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{
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return 0;
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}
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void kvm_arch_flush_shadow_all(struct kvm *kvm)
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{
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/* Flush whole GPA */
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kvm_mips_flush_gpa_pt(kvm, 0, ~0);
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/* Let implementation do the rest */
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kvm_mips_callbacks->flush_shadow_all(kvm);
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}
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void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
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struct kvm_memory_slot *slot)
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{
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/*
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* The slot has been made invalid (ready for moving or deletion), so we
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* need to ensure that it can no longer be accessed by any guest VCPUs.
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*/
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spin_lock(&kvm->mmu_lock);
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/* Flush slot from GPA */
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kvm_mips_flush_gpa_pt(kvm, slot->base_gfn,
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slot->base_gfn + slot->npages - 1);
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/* Let implementation do the rest */
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kvm_mips_callbacks->flush_shadow_memslot(kvm, slot);
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spin_unlock(&kvm->mmu_lock);
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}
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int kvm_arch_prepare_memory_region(struct kvm *kvm,
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struct kvm_memory_slot *memslot,
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const struct kvm_userspace_memory_region *mem,
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enum kvm_mr_change change)
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{
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return 0;
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}
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void kvm_arch_commit_memory_region(struct kvm *kvm,
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const struct kvm_userspace_memory_region *mem,
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const struct kvm_memory_slot *old,
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const struct kvm_memory_slot *new,
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enum kvm_mr_change change)
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{
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int needs_flush;
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kvm_debug("%s: kvm: %p slot: %d, GPA: %llx, size: %llx, QVA: %llx\n",
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__func__, kvm, mem->slot, mem->guest_phys_addr,
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mem->memory_size, mem->userspace_addr);
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/*
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* If dirty page logging is enabled, write protect all pages in the slot
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* ready for dirty logging.
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*
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* There is no need to do this in any of the following cases:
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* CREATE: No dirty mappings will already exist.
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* MOVE/DELETE: The old mappings will already have been cleaned up by
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* kvm_arch_flush_shadow_memslot()
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*/
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if (change == KVM_MR_FLAGS_ONLY &&
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(!(old->flags & KVM_MEM_LOG_DIRTY_PAGES) &&
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new->flags & KVM_MEM_LOG_DIRTY_PAGES)) {
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spin_lock(&kvm->mmu_lock);
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/* Write protect GPA page table entries */
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needs_flush = kvm_mips_mkclean_gpa_pt(kvm, new->base_gfn,
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new->base_gfn + new->npages - 1);
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/* Let implementation do the rest */
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if (needs_flush)
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kvm_mips_callbacks->flush_shadow_memslot(kvm, new);
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spin_unlock(&kvm->mmu_lock);
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}
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}
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static inline void dump_handler(const char *symbol, void *start, void *end)
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{
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u32 *p;
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pr_debug("LEAF(%s)\n", symbol);
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pr_debug("\t.set push\n");
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pr_debug("\t.set noreorder\n");
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for (p = start; p < (u32 *)end; ++p)
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pr_debug("\t.word\t0x%08x\t\t# %p\n", *p, p);
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pr_debug("\t.set\tpop\n");
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pr_debug("\tEND(%s)\n", symbol);
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}
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struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
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{
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int err, size;
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void *gebase, *p, *handler, *refill_start, *refill_end;
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int i;
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struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
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if (!vcpu) {
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err = -ENOMEM;
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goto out;
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}
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err = kvm_vcpu_init(vcpu, kvm, id);
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if (err)
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goto out_free_cpu;
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kvm_debug("kvm @ %p: create cpu %d at %p\n", kvm, id, vcpu);
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/*
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* Allocate space for host mode exception handlers that handle
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* guest mode exits
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*/
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if (cpu_has_veic || cpu_has_vint)
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size = 0x200 + VECTORSPACING * 64;
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else
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size = 0x4000;
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gebase = kzalloc(ALIGN(size, PAGE_SIZE), GFP_KERNEL);
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if (!gebase) {
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err = -ENOMEM;
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goto out_uninit_cpu;
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}
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kvm_debug("Allocated %d bytes for KVM Exception Handlers @ %p\n",
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ALIGN(size, PAGE_SIZE), gebase);
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/*
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* Check new ebase actually fits in CP0_EBase. The lack of a write gate
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* limits us to the low 512MB of physical address space. If the memory
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* we allocate is out of range, just give up now.
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*/
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if (!cpu_has_ebase_wg && virt_to_phys(gebase) >= 0x20000000) {
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kvm_err("CP0_EBase.WG required for guest exception base %pK\n",
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gebase);
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err = -ENOMEM;
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goto out_free_gebase;
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}
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/* Save new ebase */
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vcpu->arch.guest_ebase = gebase;
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/* Build guest exception vectors dynamically in unmapped memory */
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handler = gebase + 0x2000;
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/* TLB refill (or XTLB refill on 64-bit VZ where KX=1) */
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refill_start = gebase;
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if (IS_ENABLED(CONFIG_KVM_MIPS_VZ) && IS_ENABLED(CONFIG_64BIT))
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refill_start += 0x080;
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refill_end = kvm_mips_build_tlb_refill_exception(refill_start, handler);
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/* General Exception Entry point */
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kvm_mips_build_exception(gebase + 0x180, handler);
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/* For vectored interrupts poke the exception code @ all offsets 0-7 */
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for (i = 0; i < 8; i++) {
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kvm_debug("L1 Vectored handler @ %p\n",
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gebase + 0x200 + (i * VECTORSPACING));
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kvm_mips_build_exception(gebase + 0x200 + i * VECTORSPACING,
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handler);
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}
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/* General exit handler */
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p = handler;
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p = kvm_mips_build_exit(p);
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/* Guest entry routine */
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vcpu->arch.vcpu_run = p;
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p = kvm_mips_build_vcpu_run(p);
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/* Dump the generated code */
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pr_debug("#include <asm/asm.h>\n");
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pr_debug("#include <asm/regdef.h>\n");
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pr_debug("\n");
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dump_handler("kvm_vcpu_run", vcpu->arch.vcpu_run, p);
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dump_handler("kvm_tlb_refill", refill_start, refill_end);
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dump_handler("kvm_gen_exc", gebase + 0x180, gebase + 0x200);
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dump_handler("kvm_exit", gebase + 0x2000, vcpu->arch.vcpu_run);
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/* Invalidate the icache for these ranges */
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flush_icache_range((unsigned long)gebase,
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(unsigned long)gebase + ALIGN(size, PAGE_SIZE));
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/*
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* Allocate comm page for guest kernel, a TLB will be reserved for
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* mapping GVA @ 0xFFFF8000 to this page
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*/
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vcpu->arch.kseg0_commpage = kzalloc(PAGE_SIZE << 1, GFP_KERNEL);
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if (!vcpu->arch.kseg0_commpage) {
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err = -ENOMEM;
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goto out_free_gebase;
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}
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kvm_debug("Allocated COMM page @ %p\n", vcpu->arch.kseg0_commpage);
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kvm_mips_commpage_init(vcpu);
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|
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/* Init */
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vcpu->arch.last_sched_cpu = -1;
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|
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return vcpu;
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out_free_gebase:
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kfree(gebase);
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|
|
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out_uninit_cpu:
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kvm_vcpu_uninit(vcpu);
|
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out_free_cpu:
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kfree(vcpu);
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out:
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return ERR_PTR(err);
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}
|
|
|
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void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
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{
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hrtimer_cancel(&vcpu->arch.comparecount_timer);
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kvm_vcpu_uninit(vcpu);
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|
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kvm_mips_dump_stats(vcpu);
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|
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kvm_mmu_free_memory_caches(vcpu);
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kfree(vcpu->arch.guest_ebase);
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kfree(vcpu->arch.kseg0_commpage);
|
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kfree(vcpu);
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}
|
|
|
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void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
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{
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kvm_arch_vcpu_free(vcpu);
|
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}
|
|
|
|
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
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struct kvm_guest_debug *dbg)
|
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{
|
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return -ENOIOCTLCMD;
|
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}
|
|
|
|
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
|
|
{
|
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int r = -EINTR;
|
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sigset_t sigsaved;
|
|
|
|
if (vcpu->sigset_active)
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sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
|
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|
|
if (vcpu->mmio_needed) {
|
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if (!vcpu->mmio_is_write)
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kvm_mips_complete_mmio_load(vcpu, run);
|
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vcpu->mmio_needed = 0;
|
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}
|
|
|
|
if (run->immediate_exit)
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goto out;
|
|
|
|
lose_fpu(1);
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|
|
local_irq_disable();
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guest_enter_irqoff();
|
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trace_kvm_enter(vcpu);
|
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|
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/*
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* Make sure the read of VCPU requests in vcpu_run() callback is not
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* reordered ahead of the write to vcpu->mode, or we could miss a TLB
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* flush request while the requester sees the VCPU as outside of guest
|
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* mode and not needing an IPI.
|
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*/
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smp_store_mb(vcpu->mode, IN_GUEST_MODE);
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|
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r = kvm_mips_callbacks->vcpu_run(run, vcpu);
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|
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trace_kvm_out(vcpu);
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guest_exit_irqoff();
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local_irq_enable();
|
|
|
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out:
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if (vcpu->sigset_active)
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sigprocmask(SIG_SETMASK, &sigsaved, NULL);
|
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|
|
return r;
|
|
}
|
|
|
|
int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
|
|
struct kvm_mips_interrupt *irq)
|
|
{
|
|
int intr = (int)irq->irq;
|
|
struct kvm_vcpu *dvcpu = NULL;
|
|
|
|
if (intr == 3 || intr == -3 || intr == 4 || intr == -4)
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|
kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu,
|
|
(int)intr);
|
|
|
|
if (irq->cpu == -1)
|
|
dvcpu = vcpu;
|
|
else
|
|
dvcpu = vcpu->kvm->vcpus[irq->cpu];
|
|
|
|
if (intr == 2 || intr == 3 || intr == 4) {
|
|
kvm_mips_callbacks->queue_io_int(dvcpu, irq);
|
|
|
|
} else if (intr == -2 || intr == -3 || intr == -4) {
|
|
kvm_mips_callbacks->dequeue_io_int(dvcpu, irq);
|
|
} else {
|
|
kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__,
|
|
irq->cpu, irq->irq);
|
|
return -EINVAL;
|
|
}
|
|
|
|
dvcpu->arch.wait = 0;
|
|
|
|
if (swait_active(&dvcpu->wq))
|
|
swake_up(&dvcpu->wq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
|
|
struct kvm_mp_state *mp_state)
|
|
{
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
|
|
struct kvm_mp_state *mp_state)
|
|
{
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
static u64 kvm_mips_get_one_regs[] = {
|
|
KVM_REG_MIPS_R0,
|
|
KVM_REG_MIPS_R1,
|
|
KVM_REG_MIPS_R2,
|
|
KVM_REG_MIPS_R3,
|
|
KVM_REG_MIPS_R4,
|
|
KVM_REG_MIPS_R5,
|
|
KVM_REG_MIPS_R6,
|
|
KVM_REG_MIPS_R7,
|
|
KVM_REG_MIPS_R8,
|
|
KVM_REG_MIPS_R9,
|
|
KVM_REG_MIPS_R10,
|
|
KVM_REG_MIPS_R11,
|
|
KVM_REG_MIPS_R12,
|
|
KVM_REG_MIPS_R13,
|
|
KVM_REG_MIPS_R14,
|
|
KVM_REG_MIPS_R15,
|
|
KVM_REG_MIPS_R16,
|
|
KVM_REG_MIPS_R17,
|
|
KVM_REG_MIPS_R18,
|
|
KVM_REG_MIPS_R19,
|
|
KVM_REG_MIPS_R20,
|
|
KVM_REG_MIPS_R21,
|
|
KVM_REG_MIPS_R22,
|
|
KVM_REG_MIPS_R23,
|
|
KVM_REG_MIPS_R24,
|
|
KVM_REG_MIPS_R25,
|
|
KVM_REG_MIPS_R26,
|
|
KVM_REG_MIPS_R27,
|
|
KVM_REG_MIPS_R28,
|
|
KVM_REG_MIPS_R29,
|
|
KVM_REG_MIPS_R30,
|
|
KVM_REG_MIPS_R31,
|
|
|
|
#ifndef CONFIG_CPU_MIPSR6
|
|
KVM_REG_MIPS_HI,
|
|
KVM_REG_MIPS_LO,
|
|
#endif
|
|
KVM_REG_MIPS_PC,
|
|
};
|
|
|
|
static u64 kvm_mips_get_one_regs_fpu[] = {
|
|
KVM_REG_MIPS_FCR_IR,
|
|
KVM_REG_MIPS_FCR_CSR,
|
|
};
|
|
|
|
static u64 kvm_mips_get_one_regs_msa[] = {
|
|
KVM_REG_MIPS_MSA_IR,
|
|
KVM_REG_MIPS_MSA_CSR,
|
|
};
|
|
|
|
static unsigned long kvm_mips_num_regs(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long ret;
|
|
|
|
ret = ARRAY_SIZE(kvm_mips_get_one_regs);
|
|
if (kvm_mips_guest_can_have_fpu(&vcpu->arch)) {
|
|
ret += ARRAY_SIZE(kvm_mips_get_one_regs_fpu) + 48;
|
|
/* odd doubles */
|
|
if (boot_cpu_data.fpu_id & MIPS_FPIR_F64)
|
|
ret += 16;
|
|
}
|
|
if (kvm_mips_guest_can_have_msa(&vcpu->arch))
|
|
ret += ARRAY_SIZE(kvm_mips_get_one_regs_msa) + 32;
|
|
ret += kvm_mips_callbacks->num_regs(vcpu);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int kvm_mips_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices)
|
|
{
|
|
u64 index;
|
|
unsigned int i;
|
|
|
|
if (copy_to_user(indices, kvm_mips_get_one_regs,
|
|
sizeof(kvm_mips_get_one_regs)))
|
|
return -EFAULT;
|
|
indices += ARRAY_SIZE(kvm_mips_get_one_regs);
|
|
|
|
if (kvm_mips_guest_can_have_fpu(&vcpu->arch)) {
|
|
if (copy_to_user(indices, kvm_mips_get_one_regs_fpu,
|
|
sizeof(kvm_mips_get_one_regs_fpu)))
|
|
return -EFAULT;
|
|
indices += ARRAY_SIZE(kvm_mips_get_one_regs_fpu);
|
|
|
|
for (i = 0; i < 32; ++i) {
|
|
index = KVM_REG_MIPS_FPR_32(i);
|
|
if (copy_to_user(indices, &index, sizeof(index)))
|
|
return -EFAULT;
|
|
++indices;
|
|
|
|
/* skip odd doubles if no F64 */
|
|
if (i & 1 && !(boot_cpu_data.fpu_id & MIPS_FPIR_F64))
|
|
continue;
|
|
|
|
index = KVM_REG_MIPS_FPR_64(i);
|
|
if (copy_to_user(indices, &index, sizeof(index)))
|
|
return -EFAULT;
|
|
++indices;
|
|
}
|
|
}
|
|
|
|
if (kvm_mips_guest_can_have_msa(&vcpu->arch)) {
|
|
if (copy_to_user(indices, kvm_mips_get_one_regs_msa,
|
|
sizeof(kvm_mips_get_one_regs_msa)))
|
|
return -EFAULT;
|
|
indices += ARRAY_SIZE(kvm_mips_get_one_regs_msa);
|
|
|
|
for (i = 0; i < 32; ++i) {
|
|
index = KVM_REG_MIPS_VEC_128(i);
|
|
if (copy_to_user(indices, &index, sizeof(index)))
|
|
return -EFAULT;
|
|
++indices;
|
|
}
|
|
}
|
|
|
|
return kvm_mips_callbacks->copy_reg_indices(vcpu, indices);
|
|
}
|
|
|
|
static int kvm_mips_get_reg(struct kvm_vcpu *vcpu,
|
|
const struct kvm_one_reg *reg)
|
|
{
|
|
struct mips_coproc *cop0 = vcpu->arch.cop0;
|
|
struct mips_fpu_struct *fpu = &vcpu->arch.fpu;
|
|
int ret;
|
|
s64 v;
|
|
s64 vs[2];
|
|
unsigned int idx;
|
|
|
|
switch (reg->id) {
|
|
/* General purpose registers */
|
|
case KVM_REG_MIPS_R0 ... KVM_REG_MIPS_R31:
|
|
v = (long)vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0];
|
|
break;
|
|
#ifndef CONFIG_CPU_MIPSR6
|
|
case KVM_REG_MIPS_HI:
|
|
v = (long)vcpu->arch.hi;
|
|
break;
|
|
case KVM_REG_MIPS_LO:
|
|
v = (long)vcpu->arch.lo;
|
|
break;
|
|
#endif
|
|
case KVM_REG_MIPS_PC:
|
|
v = (long)vcpu->arch.pc;
|
|
break;
|
|
|
|
/* Floating point registers */
|
|
case KVM_REG_MIPS_FPR_32(0) ... KVM_REG_MIPS_FPR_32(31):
|
|
if (!kvm_mips_guest_has_fpu(&vcpu->arch))
|
|
return -EINVAL;
|
|
idx = reg->id - KVM_REG_MIPS_FPR_32(0);
|
|
/* Odd singles in top of even double when FR=0 */
|
|
if (kvm_read_c0_guest_status(cop0) & ST0_FR)
|
|
v = get_fpr32(&fpu->fpr[idx], 0);
|
|
else
|
|
v = get_fpr32(&fpu->fpr[idx & ~1], idx & 1);
|
|
break;
|
|
case KVM_REG_MIPS_FPR_64(0) ... KVM_REG_MIPS_FPR_64(31):
|
|
if (!kvm_mips_guest_has_fpu(&vcpu->arch))
|
|
return -EINVAL;
|
|
idx = reg->id - KVM_REG_MIPS_FPR_64(0);
|
|
/* Can't access odd doubles in FR=0 mode */
|
|
if (idx & 1 && !(kvm_read_c0_guest_status(cop0) & ST0_FR))
|
|
return -EINVAL;
|
|
v = get_fpr64(&fpu->fpr[idx], 0);
|
|
break;
|
|
case KVM_REG_MIPS_FCR_IR:
|
|
if (!kvm_mips_guest_has_fpu(&vcpu->arch))
|
|
return -EINVAL;
|
|
v = boot_cpu_data.fpu_id;
|
|
break;
|
|
case KVM_REG_MIPS_FCR_CSR:
|
|
if (!kvm_mips_guest_has_fpu(&vcpu->arch))
|
|
return -EINVAL;
|
|
v = fpu->fcr31;
|
|
break;
|
|
|
|
/* MIPS SIMD Architecture (MSA) registers */
|
|
case KVM_REG_MIPS_VEC_128(0) ... KVM_REG_MIPS_VEC_128(31):
|
|
if (!kvm_mips_guest_has_msa(&vcpu->arch))
|
|
return -EINVAL;
|
|
/* Can't access MSA registers in FR=0 mode */
|
|
if (!(kvm_read_c0_guest_status(cop0) & ST0_FR))
|
|
return -EINVAL;
|
|
idx = reg->id - KVM_REG_MIPS_VEC_128(0);
|
|
#ifdef CONFIG_CPU_LITTLE_ENDIAN
|
|
/* least significant byte first */
|
|
vs[0] = get_fpr64(&fpu->fpr[idx], 0);
|
|
vs[1] = get_fpr64(&fpu->fpr[idx], 1);
|
|
#else
|
|
/* most significant byte first */
|
|
vs[0] = get_fpr64(&fpu->fpr[idx], 1);
|
|
vs[1] = get_fpr64(&fpu->fpr[idx], 0);
|
|
#endif
|
|
break;
|
|
case KVM_REG_MIPS_MSA_IR:
|
|
if (!kvm_mips_guest_has_msa(&vcpu->arch))
|
|
return -EINVAL;
|
|
v = boot_cpu_data.msa_id;
|
|
break;
|
|
case KVM_REG_MIPS_MSA_CSR:
|
|
if (!kvm_mips_guest_has_msa(&vcpu->arch))
|
|
return -EINVAL;
|
|
v = fpu->msacsr;
|
|
break;
|
|
|
|
/* registers to be handled specially */
|
|
default:
|
|
ret = kvm_mips_callbacks->get_one_reg(vcpu, reg, &v);
|
|
if (ret)
|
|
return ret;
|
|
break;
|
|
}
|
|
if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
|
|
u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
|
|
|
|
return put_user(v, uaddr64);
|
|
} else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
|
|
u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
|
|
u32 v32 = (u32)v;
|
|
|
|
return put_user(v32, uaddr32);
|
|
} else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U128) {
|
|
void __user *uaddr = (void __user *)(long)reg->addr;
|
|
|
|
return copy_to_user(uaddr, vs, 16) ? -EFAULT : 0;
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int kvm_mips_set_reg(struct kvm_vcpu *vcpu,
|
|
const struct kvm_one_reg *reg)
|
|
{
|
|
struct mips_coproc *cop0 = vcpu->arch.cop0;
|
|
struct mips_fpu_struct *fpu = &vcpu->arch.fpu;
|
|
s64 v;
|
|
s64 vs[2];
|
|
unsigned int idx;
|
|
|
|
if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
|
|
u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
|
|
|
|
if (get_user(v, uaddr64) != 0)
|
|
return -EFAULT;
|
|
} else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
|
|
u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
|
|
s32 v32;
|
|
|
|
if (get_user(v32, uaddr32) != 0)
|
|
return -EFAULT;
|
|
v = (s64)v32;
|
|
} else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U128) {
|
|
void __user *uaddr = (void __user *)(long)reg->addr;
|
|
|
|
return copy_from_user(vs, uaddr, 16) ? -EFAULT : 0;
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (reg->id) {
|
|
/* General purpose registers */
|
|
case KVM_REG_MIPS_R0:
|
|
/* Silently ignore requests to set $0 */
|
|
break;
|
|
case KVM_REG_MIPS_R1 ... KVM_REG_MIPS_R31:
|
|
vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0] = v;
|
|
break;
|
|
#ifndef CONFIG_CPU_MIPSR6
|
|
case KVM_REG_MIPS_HI:
|
|
vcpu->arch.hi = v;
|
|
break;
|
|
case KVM_REG_MIPS_LO:
|
|
vcpu->arch.lo = v;
|
|
break;
|
|
#endif
|
|
case KVM_REG_MIPS_PC:
|
|
vcpu->arch.pc = v;
|
|
break;
|
|
|
|
/* Floating point registers */
|
|
case KVM_REG_MIPS_FPR_32(0) ... KVM_REG_MIPS_FPR_32(31):
|
|
if (!kvm_mips_guest_has_fpu(&vcpu->arch))
|
|
return -EINVAL;
|
|
idx = reg->id - KVM_REG_MIPS_FPR_32(0);
|
|
/* Odd singles in top of even double when FR=0 */
|
|
if (kvm_read_c0_guest_status(cop0) & ST0_FR)
|
|
set_fpr32(&fpu->fpr[idx], 0, v);
|
|
else
|
|
set_fpr32(&fpu->fpr[idx & ~1], idx & 1, v);
|
|
break;
|
|
case KVM_REG_MIPS_FPR_64(0) ... KVM_REG_MIPS_FPR_64(31):
|
|
if (!kvm_mips_guest_has_fpu(&vcpu->arch))
|
|
return -EINVAL;
|
|
idx = reg->id - KVM_REG_MIPS_FPR_64(0);
|
|
/* Can't access odd doubles in FR=0 mode */
|
|
if (idx & 1 && !(kvm_read_c0_guest_status(cop0) & ST0_FR))
|
|
return -EINVAL;
|
|
set_fpr64(&fpu->fpr[idx], 0, v);
|
|
break;
|
|
case KVM_REG_MIPS_FCR_IR:
|
|
if (!kvm_mips_guest_has_fpu(&vcpu->arch))
|
|
return -EINVAL;
|
|
/* Read-only */
|
|
break;
|
|
case KVM_REG_MIPS_FCR_CSR:
|
|
if (!kvm_mips_guest_has_fpu(&vcpu->arch))
|
|
return -EINVAL;
|
|
fpu->fcr31 = v;
|
|
break;
|
|
|
|
/* MIPS SIMD Architecture (MSA) registers */
|
|
case KVM_REG_MIPS_VEC_128(0) ... KVM_REG_MIPS_VEC_128(31):
|
|
if (!kvm_mips_guest_has_msa(&vcpu->arch))
|
|
return -EINVAL;
|
|
idx = reg->id - KVM_REG_MIPS_VEC_128(0);
|
|
#ifdef CONFIG_CPU_LITTLE_ENDIAN
|
|
/* least significant byte first */
|
|
set_fpr64(&fpu->fpr[idx], 0, vs[0]);
|
|
set_fpr64(&fpu->fpr[idx], 1, vs[1]);
|
|
#else
|
|
/* most significant byte first */
|
|
set_fpr64(&fpu->fpr[idx], 1, vs[0]);
|
|
set_fpr64(&fpu->fpr[idx], 0, vs[1]);
|
|
#endif
|
|
break;
|
|
case KVM_REG_MIPS_MSA_IR:
|
|
if (!kvm_mips_guest_has_msa(&vcpu->arch))
|
|
return -EINVAL;
|
|
/* Read-only */
|
|
break;
|
|
case KVM_REG_MIPS_MSA_CSR:
|
|
if (!kvm_mips_guest_has_msa(&vcpu->arch))
|
|
return -EINVAL;
|
|
fpu->msacsr = v;
|
|
break;
|
|
|
|
/* registers to be handled specially */
|
|
default:
|
|
return kvm_mips_callbacks->set_one_reg(vcpu, reg, v);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
|
|
struct kvm_enable_cap *cap)
|
|
{
|
|
int r = 0;
|
|
|
|
if (!kvm_vm_ioctl_check_extension(vcpu->kvm, cap->cap))
|
|
return -EINVAL;
|
|
if (cap->flags)
|
|
return -EINVAL;
|
|
if (cap->args[0])
|
|
return -EINVAL;
|
|
|
|
switch (cap->cap) {
|
|
case KVM_CAP_MIPS_FPU:
|
|
vcpu->arch.fpu_enabled = true;
|
|
break;
|
|
case KVM_CAP_MIPS_MSA:
|
|
vcpu->arch.msa_enabled = true;
|
|
break;
|
|
default:
|
|
r = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
|
|
unsigned long arg)
|
|
{
|
|
struct kvm_vcpu *vcpu = filp->private_data;
|
|
void __user *argp = (void __user *)arg;
|
|
long r;
|
|
|
|
switch (ioctl) {
|
|
case KVM_SET_ONE_REG:
|
|
case KVM_GET_ONE_REG: {
|
|
struct kvm_one_reg reg;
|
|
|
|
if (copy_from_user(®, argp, sizeof(reg)))
|
|
return -EFAULT;
|
|
if (ioctl == KVM_SET_ONE_REG)
|
|
return kvm_mips_set_reg(vcpu, ®);
|
|
else
|
|
return kvm_mips_get_reg(vcpu, ®);
|
|
}
|
|
case KVM_GET_REG_LIST: {
|
|
struct kvm_reg_list __user *user_list = argp;
|
|
struct kvm_reg_list reg_list;
|
|
unsigned n;
|
|
|
|
if (copy_from_user(®_list, user_list, sizeof(reg_list)))
|
|
return -EFAULT;
|
|
n = reg_list.n;
|
|
reg_list.n = kvm_mips_num_regs(vcpu);
|
|
if (copy_to_user(user_list, ®_list, sizeof(reg_list)))
|
|
return -EFAULT;
|
|
if (n < reg_list.n)
|
|
return -E2BIG;
|
|
return kvm_mips_copy_reg_indices(vcpu, user_list->reg);
|
|
}
|
|
case KVM_INTERRUPT:
|
|
{
|
|
struct kvm_mips_interrupt irq;
|
|
|
|
if (copy_from_user(&irq, argp, sizeof(irq)))
|
|
return -EFAULT;
|
|
kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
|
|
irq.irq);
|
|
|
|
r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
|
|
break;
|
|
}
|
|
case KVM_ENABLE_CAP: {
|
|
struct kvm_enable_cap cap;
|
|
|
|
if (copy_from_user(&cap, argp, sizeof(cap)))
|
|
return -EFAULT;
|
|
r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
|
|
break;
|
|
}
|
|
default:
|
|
r = -ENOIOCTLCMD;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
/**
|
|
* kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
|
|
* @kvm: kvm instance
|
|
* @log: slot id and address to which we copy the log
|
|
*
|
|
* Steps 1-4 below provide general overview of dirty page logging. See
|
|
* kvm_get_dirty_log_protect() function description for additional details.
|
|
*
|
|
* We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
|
|
* always flush the TLB (step 4) even if previous step failed and the dirty
|
|
* bitmap may be corrupt. Regardless of previous outcome the KVM logging API
|
|
* does not preclude user space subsequent dirty log read. Flushing TLB ensures
|
|
* writes will be marked dirty for next log read.
|
|
*
|
|
* 1. Take a snapshot of the bit and clear it if needed.
|
|
* 2. Write protect the corresponding page.
|
|
* 3. Copy the snapshot to the userspace.
|
|
* 4. Flush TLB's if needed.
|
|
*/
|
|
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
|
|
{
|
|
struct kvm_memslots *slots;
|
|
struct kvm_memory_slot *memslot;
|
|
bool is_dirty = false;
|
|
int r;
|
|
|
|
mutex_lock(&kvm->slots_lock);
|
|
|
|
r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
|
|
|
|
if (is_dirty) {
|
|
slots = kvm_memslots(kvm);
|
|
memslot = id_to_memslot(slots, log->slot);
|
|
|
|
/* Let implementation handle TLB/GVA invalidation */
|
|
kvm_mips_callbacks->flush_shadow_memslot(kvm, memslot);
|
|
}
|
|
|
|
mutex_unlock(&kvm->slots_lock);
|
|
return r;
|
|
}
|
|
|
|
long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
|
|
{
|
|
long r;
|
|
|
|
switch (ioctl) {
|
|
default:
|
|
r = -ENOIOCTLCMD;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
int kvm_arch_init(void *opaque)
|
|
{
|
|
if (kvm_mips_callbacks) {
|
|
kvm_err("kvm: module already exists\n");
|
|
return -EEXIST;
|
|
}
|
|
|
|
return kvm_mips_emulation_init(&kvm_mips_callbacks);
|
|
}
|
|
|
|
void kvm_arch_exit(void)
|
|
{
|
|
kvm_mips_callbacks = NULL;
|
|
}
|
|
|
|
int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
|
|
struct kvm_sregs *sregs)
|
|
{
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
|
|
struct kvm_sregs *sregs)
|
|
{
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
|
|
{
|
|
}
|
|
|
|
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
|
|
{
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
|
|
{
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
|
|
{
|
|
return VM_FAULT_SIGBUS;
|
|
}
|
|
|
|
int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
|
|
{
|
|
int r;
|
|
|
|
switch (ext) {
|
|
case KVM_CAP_ONE_REG:
|
|
case KVM_CAP_ENABLE_CAP:
|
|
case KVM_CAP_READONLY_MEM:
|
|
case KVM_CAP_SYNC_MMU:
|
|
case KVM_CAP_IMMEDIATE_EXIT:
|
|
r = 1;
|
|
break;
|
|
case KVM_CAP_COALESCED_MMIO:
|
|
r = KVM_COALESCED_MMIO_PAGE_OFFSET;
|
|
break;
|
|
case KVM_CAP_NR_VCPUS:
|
|
r = num_online_cpus();
|
|
break;
|
|
case KVM_CAP_MAX_VCPUS:
|
|
r = KVM_MAX_VCPUS;
|
|
break;
|
|
case KVM_CAP_MIPS_FPU:
|
|
/* We don't handle systems with inconsistent cpu_has_fpu */
|
|
r = !!raw_cpu_has_fpu;
|
|
break;
|
|
case KVM_CAP_MIPS_MSA:
|
|
/*
|
|
* We don't support MSA vector partitioning yet:
|
|
* 1) It would require explicit support which can't be tested
|
|
* yet due to lack of support in current hardware.
|
|
* 2) It extends the state that would need to be saved/restored
|
|
* by e.g. QEMU for migration.
|
|
*
|
|
* When vector partitioning hardware becomes available, support
|
|
* could be added by requiring a flag when enabling
|
|
* KVM_CAP_MIPS_MSA capability to indicate that userland knows
|
|
* to save/restore the appropriate extra state.
|
|
*/
|
|
r = cpu_has_msa && !(boot_cpu_data.msa_id & MSA_IR_WRPF);
|
|
break;
|
|
default:
|
|
r = kvm_mips_callbacks->check_extension(kvm, ext);
|
|
break;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
|
|
{
|
|
return kvm_mips_pending_timer(vcpu);
|
|
}
|
|
|
|
int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
|
|
{
|
|
int i;
|
|
struct mips_coproc *cop0;
|
|
|
|
if (!vcpu)
|
|
return -1;
|
|
|
|
kvm_debug("VCPU Register Dump:\n");
|
|
kvm_debug("\tpc = 0x%08lx\n", vcpu->arch.pc);
|
|
kvm_debug("\texceptions: %08lx\n", vcpu->arch.pending_exceptions);
|
|
|
|
for (i = 0; i < 32; i += 4) {
|
|
kvm_debug("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i,
|
|
vcpu->arch.gprs[i],
|
|
vcpu->arch.gprs[i + 1],
|
|
vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]);
|
|
}
|
|
kvm_debug("\thi: 0x%08lx\n", vcpu->arch.hi);
|
|
kvm_debug("\tlo: 0x%08lx\n", vcpu->arch.lo);
|
|
|
|
cop0 = vcpu->arch.cop0;
|
|
kvm_debug("\tStatus: 0x%08x, Cause: 0x%08x\n",
|
|
kvm_read_c0_guest_status(cop0),
|
|
kvm_read_c0_guest_cause(cop0));
|
|
|
|
kvm_debug("\tEPC: 0x%08lx\n", kvm_read_c0_guest_epc(cop0));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
|
|
{
|
|
int i;
|
|
|
|
for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
|
|
vcpu->arch.gprs[i] = regs->gpr[i];
|
|
vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */
|
|
vcpu->arch.hi = regs->hi;
|
|
vcpu->arch.lo = regs->lo;
|
|
vcpu->arch.pc = regs->pc;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
|
|
regs->gpr[i] = vcpu->arch.gprs[i];
|
|
|
|
regs->hi = vcpu->arch.hi;
|
|
regs->lo = vcpu->arch.lo;
|
|
regs->pc = vcpu->arch.pc;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void kvm_mips_comparecount_func(unsigned long data)
|
|
{
|
|
struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
|
|
|
|
kvm_mips_callbacks->queue_timer_int(vcpu);
|
|
|
|
vcpu->arch.wait = 0;
|
|
if (swait_active(&vcpu->wq))
|
|
swake_up(&vcpu->wq);
|
|
}
|
|
|
|
/* low level hrtimer wake routine */
|
|
static enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer)
|
|
{
|
|
struct kvm_vcpu *vcpu;
|
|
|
|
vcpu = container_of(timer, struct kvm_vcpu, arch.comparecount_timer);
|
|
kvm_mips_comparecount_func((unsigned long) vcpu);
|
|
return kvm_mips_count_timeout(vcpu);
|
|
}
|
|
|
|
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
|
|
{
|
|
int err;
|
|
|
|
err = kvm_mips_callbacks->vcpu_init(vcpu);
|
|
if (err)
|
|
return err;
|
|
|
|
hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC,
|
|
HRTIMER_MODE_REL);
|
|
vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup;
|
|
return 0;
|
|
}
|
|
|
|
void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
|
|
{
|
|
kvm_mips_callbacks->vcpu_uninit(vcpu);
|
|
}
|
|
|
|
int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
|
|
struct kvm_translation *tr)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* Initial guest state */
|
|
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
|
|
{
|
|
return kvm_mips_callbacks->vcpu_setup(vcpu);
|
|
}
|
|
|
|
static void kvm_mips_set_c0_status(void)
|
|
{
|
|
u32 status = read_c0_status();
|
|
|
|
if (cpu_has_dsp)
|
|
status |= (ST0_MX);
|
|
|
|
write_c0_status(status);
|
|
ehb();
|
|
}
|
|
|
|
/*
|
|
* Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
|
|
*/
|
|
int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 cause = vcpu->arch.host_cp0_cause;
|
|
u32 exccode = (cause >> CAUSEB_EXCCODE) & 0x1f;
|
|
u32 __user *opc = (u32 __user *) vcpu->arch.pc;
|
|
unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
|
|
enum emulation_result er = EMULATE_DONE;
|
|
u32 inst;
|
|
int ret = RESUME_GUEST;
|
|
|
|
vcpu->mode = OUTSIDE_GUEST_MODE;
|
|
|
|
/* re-enable HTW before enabling interrupts */
|
|
htw_start();
|
|
|
|
/* Set a default exit reason */
|
|
run->exit_reason = KVM_EXIT_UNKNOWN;
|
|
run->ready_for_interrupt_injection = 1;
|
|
|
|
/*
|
|
* Set the appropriate status bits based on host CPU features,
|
|
* before we hit the scheduler
|
|
*/
|
|
kvm_mips_set_c0_status();
|
|
|
|
local_irq_enable();
|
|
|
|
kvm_debug("kvm_mips_handle_exit: cause: %#x, PC: %p, kvm_run: %p, kvm_vcpu: %p\n",
|
|
cause, opc, run, vcpu);
|
|
trace_kvm_exit(vcpu, exccode);
|
|
|
|
/*
|
|
* Do a privilege check, if in UM most of these exit conditions end up
|
|
* causing an exception to be delivered to the Guest Kernel
|
|
*/
|
|
er = kvm_mips_check_privilege(cause, opc, run, vcpu);
|
|
if (er == EMULATE_PRIV_FAIL) {
|
|
goto skip_emul;
|
|
} else if (er == EMULATE_FAIL) {
|
|
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
ret = RESUME_HOST;
|
|
goto skip_emul;
|
|
}
|
|
|
|
switch (exccode) {
|
|
case EXCCODE_INT:
|
|
kvm_debug("[%d]EXCCODE_INT @ %p\n", vcpu->vcpu_id, opc);
|
|
|
|
++vcpu->stat.int_exits;
|
|
|
|
if (need_resched())
|
|
cond_resched();
|
|
|
|
ret = RESUME_GUEST;
|
|
break;
|
|
|
|
case EXCCODE_CPU:
|
|
kvm_debug("EXCCODE_CPU: @ PC: %p\n", opc);
|
|
|
|
++vcpu->stat.cop_unusable_exits;
|
|
ret = kvm_mips_callbacks->handle_cop_unusable(vcpu);
|
|
/* XXXKYMA: Might need to return to user space */
|
|
if (run->exit_reason == KVM_EXIT_IRQ_WINDOW_OPEN)
|
|
ret = RESUME_HOST;
|
|
break;
|
|
|
|
case EXCCODE_MOD:
|
|
++vcpu->stat.tlbmod_exits;
|
|
ret = kvm_mips_callbacks->handle_tlb_mod(vcpu);
|
|
break;
|
|
|
|
case EXCCODE_TLBS:
|
|
kvm_debug("TLB ST fault: cause %#x, status %#x, PC: %p, BadVaddr: %#lx\n",
|
|
cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc,
|
|
badvaddr);
|
|
|
|
++vcpu->stat.tlbmiss_st_exits;
|
|
ret = kvm_mips_callbacks->handle_tlb_st_miss(vcpu);
|
|
break;
|
|
|
|
case EXCCODE_TLBL:
|
|
kvm_debug("TLB LD fault: cause %#x, PC: %p, BadVaddr: %#lx\n",
|
|
cause, opc, badvaddr);
|
|
|
|
++vcpu->stat.tlbmiss_ld_exits;
|
|
ret = kvm_mips_callbacks->handle_tlb_ld_miss(vcpu);
|
|
break;
|
|
|
|
case EXCCODE_ADES:
|
|
++vcpu->stat.addrerr_st_exits;
|
|
ret = kvm_mips_callbacks->handle_addr_err_st(vcpu);
|
|
break;
|
|
|
|
case EXCCODE_ADEL:
|
|
++vcpu->stat.addrerr_ld_exits;
|
|
ret = kvm_mips_callbacks->handle_addr_err_ld(vcpu);
|
|
break;
|
|
|
|
case EXCCODE_SYS:
|
|
++vcpu->stat.syscall_exits;
|
|
ret = kvm_mips_callbacks->handle_syscall(vcpu);
|
|
break;
|
|
|
|
case EXCCODE_RI:
|
|
++vcpu->stat.resvd_inst_exits;
|
|
ret = kvm_mips_callbacks->handle_res_inst(vcpu);
|
|
break;
|
|
|
|
case EXCCODE_BP:
|
|
++vcpu->stat.break_inst_exits;
|
|
ret = kvm_mips_callbacks->handle_break(vcpu);
|
|
break;
|
|
|
|
case EXCCODE_TR:
|
|
++vcpu->stat.trap_inst_exits;
|
|
ret = kvm_mips_callbacks->handle_trap(vcpu);
|
|
break;
|
|
|
|
case EXCCODE_MSAFPE:
|
|
++vcpu->stat.msa_fpe_exits;
|
|
ret = kvm_mips_callbacks->handle_msa_fpe(vcpu);
|
|
break;
|
|
|
|
case EXCCODE_FPE:
|
|
++vcpu->stat.fpe_exits;
|
|
ret = kvm_mips_callbacks->handle_fpe(vcpu);
|
|
break;
|
|
|
|
case EXCCODE_MSADIS:
|
|
++vcpu->stat.msa_disabled_exits;
|
|
ret = kvm_mips_callbacks->handle_msa_disabled(vcpu);
|
|
break;
|
|
|
|
case EXCCODE_GE:
|
|
/* defer exit accounting to handler */
|
|
ret = kvm_mips_callbacks->handle_guest_exit(vcpu);
|
|
break;
|
|
|
|
default:
|
|
if (cause & CAUSEF_BD)
|
|
opc += 1;
|
|
inst = 0;
|
|
kvm_get_badinstr(opc, vcpu, &inst);
|
|
kvm_err("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x BadVaddr: %#lx Status: %#x\n",
|
|
exccode, opc, inst, badvaddr,
|
|
kvm_read_c0_guest_status(vcpu->arch.cop0));
|
|
kvm_arch_vcpu_dump_regs(vcpu);
|
|
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
ret = RESUME_HOST;
|
|
break;
|
|
|
|
}
|
|
|
|
skip_emul:
|
|
local_irq_disable();
|
|
|
|
if (er == EMULATE_DONE && !(ret & RESUME_HOST))
|
|
kvm_mips_deliver_interrupts(vcpu, cause);
|
|
|
|
if (!(ret & RESUME_HOST)) {
|
|
/* Only check for signals if not already exiting to userspace */
|
|
if (signal_pending(current)) {
|
|
run->exit_reason = KVM_EXIT_INTR;
|
|
ret = (-EINTR << 2) | RESUME_HOST;
|
|
++vcpu->stat.signal_exits;
|
|
trace_kvm_exit(vcpu, KVM_TRACE_EXIT_SIGNAL);
|
|
}
|
|
}
|
|
|
|
if (ret == RESUME_GUEST) {
|
|
trace_kvm_reenter(vcpu);
|
|
|
|
/*
|
|
* Make sure the read of VCPU requests in vcpu_reenter()
|
|
* callback is not reordered ahead of the write to vcpu->mode,
|
|
* or we could miss a TLB flush request while the requester sees
|
|
* the VCPU as outside of guest mode and not needing an IPI.
|
|
*/
|
|
smp_store_mb(vcpu->mode, IN_GUEST_MODE);
|
|
|
|
kvm_mips_callbacks->vcpu_reenter(run, vcpu);
|
|
|
|
/*
|
|
* If FPU / MSA are enabled (i.e. the guest's FPU / MSA context
|
|
* is live), restore FCR31 / MSACSR.
|
|
*
|
|
* This should be before returning to the guest exception
|
|
* vector, as it may well cause an [MSA] FP exception if there
|
|
* are pending exception bits unmasked. (see
|
|
* kvm_mips_csr_die_notifier() for how that is handled).
|
|
*/
|
|
if (kvm_mips_guest_has_fpu(&vcpu->arch) &&
|
|
read_c0_status() & ST0_CU1)
|
|
__kvm_restore_fcsr(&vcpu->arch);
|
|
|
|
if (kvm_mips_guest_has_msa(&vcpu->arch) &&
|
|
read_c0_config5() & MIPS_CONF5_MSAEN)
|
|
__kvm_restore_msacsr(&vcpu->arch);
|
|
}
|
|
|
|
/* Disable HTW before returning to guest or host */
|
|
htw_stop();
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Enable FPU for guest and restore context */
|
|
void kvm_own_fpu(struct kvm_vcpu *vcpu)
|
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{
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struct mips_coproc *cop0 = vcpu->arch.cop0;
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unsigned int sr, cfg5;
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preempt_disable();
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sr = kvm_read_c0_guest_status(cop0);
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/*
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* If MSA state is already live, it is undefined how it interacts with
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* FR=0 FPU state, and we don't want to hit reserved instruction
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* exceptions trying to save the MSA state later when CU=1 && FR=1, so
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* play it safe and save it first.
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*
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* In theory we shouldn't ever hit this case since kvm_lose_fpu() should
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* get called when guest CU1 is set, however we can't trust the guest
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* not to clobber the status register directly via the commpage.
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*/
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if (cpu_has_msa && sr & ST0_CU1 && !(sr & ST0_FR) &&
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vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA)
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kvm_lose_fpu(vcpu);
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/*
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* Enable FPU for guest
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* We set FR and FRE according to guest context
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*/
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change_c0_status(ST0_CU1 | ST0_FR, sr);
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if (cpu_has_fre) {
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cfg5 = kvm_read_c0_guest_config5(cop0);
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change_c0_config5(MIPS_CONF5_FRE, cfg5);
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}
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enable_fpu_hazard();
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/* If guest FPU state not active, restore it now */
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if (!(vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU)) {
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__kvm_restore_fpu(&vcpu->arch);
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vcpu->arch.aux_inuse |= KVM_MIPS_AUX_FPU;
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trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_FPU);
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} else {
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trace_kvm_aux(vcpu, KVM_TRACE_AUX_ENABLE, KVM_TRACE_AUX_FPU);
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}
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preempt_enable();
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}
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#ifdef CONFIG_CPU_HAS_MSA
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/* Enable MSA for guest and restore context */
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void kvm_own_msa(struct kvm_vcpu *vcpu)
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{
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struct mips_coproc *cop0 = vcpu->arch.cop0;
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unsigned int sr, cfg5;
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preempt_disable();
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/*
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* Enable FPU if enabled in guest, since we're restoring FPU context
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* anyway. We set FR and FRE according to guest context.
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*/
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if (kvm_mips_guest_has_fpu(&vcpu->arch)) {
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sr = kvm_read_c0_guest_status(cop0);
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/*
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* If FR=0 FPU state is already live, it is undefined how it
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* interacts with MSA state, so play it safe and save it first.
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*/
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if (!(sr & ST0_FR) &&
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(vcpu->arch.aux_inuse & (KVM_MIPS_AUX_FPU |
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KVM_MIPS_AUX_MSA)) == KVM_MIPS_AUX_FPU)
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kvm_lose_fpu(vcpu);
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change_c0_status(ST0_CU1 | ST0_FR, sr);
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if (sr & ST0_CU1 && cpu_has_fre) {
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cfg5 = kvm_read_c0_guest_config5(cop0);
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change_c0_config5(MIPS_CONF5_FRE, cfg5);
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}
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}
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/* Enable MSA for guest */
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set_c0_config5(MIPS_CONF5_MSAEN);
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enable_fpu_hazard();
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switch (vcpu->arch.aux_inuse & (KVM_MIPS_AUX_FPU | KVM_MIPS_AUX_MSA)) {
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case KVM_MIPS_AUX_FPU:
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/*
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* Guest FPU state already loaded, only restore upper MSA state
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*/
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__kvm_restore_msa_upper(&vcpu->arch);
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vcpu->arch.aux_inuse |= KVM_MIPS_AUX_MSA;
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trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_MSA);
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break;
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case 0:
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/* Neither FPU or MSA already active, restore full MSA state */
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__kvm_restore_msa(&vcpu->arch);
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vcpu->arch.aux_inuse |= KVM_MIPS_AUX_MSA;
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if (kvm_mips_guest_has_fpu(&vcpu->arch))
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vcpu->arch.aux_inuse |= KVM_MIPS_AUX_FPU;
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trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE,
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KVM_TRACE_AUX_FPU_MSA);
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break;
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default:
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trace_kvm_aux(vcpu, KVM_TRACE_AUX_ENABLE, KVM_TRACE_AUX_MSA);
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break;
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}
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preempt_enable();
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}
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#endif
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/* Drop FPU & MSA without saving it */
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void kvm_drop_fpu(struct kvm_vcpu *vcpu)
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{
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preempt_disable();
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if (cpu_has_msa && vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA) {
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disable_msa();
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trace_kvm_aux(vcpu, KVM_TRACE_AUX_DISCARD, KVM_TRACE_AUX_MSA);
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vcpu->arch.aux_inuse &= ~KVM_MIPS_AUX_MSA;
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}
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if (vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU) {
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clear_c0_status(ST0_CU1 | ST0_FR);
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trace_kvm_aux(vcpu, KVM_TRACE_AUX_DISCARD, KVM_TRACE_AUX_FPU);
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vcpu->arch.aux_inuse &= ~KVM_MIPS_AUX_FPU;
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}
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preempt_enable();
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}
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/* Save and disable FPU & MSA */
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void kvm_lose_fpu(struct kvm_vcpu *vcpu)
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{
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/*
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* With T&E, FPU & MSA get disabled in root context (hardware) when it
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* is disabled in guest context (software), but the register state in
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* the hardware may still be in use.
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* This is why we explicitly re-enable the hardware before saving.
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*/
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preempt_disable();
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if (cpu_has_msa && vcpu->arch.aux_inuse & KVM_MIPS_AUX_MSA) {
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if (!IS_ENABLED(CONFIG_KVM_MIPS_VZ)) {
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set_c0_config5(MIPS_CONF5_MSAEN);
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enable_fpu_hazard();
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}
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__kvm_save_msa(&vcpu->arch);
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trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_FPU_MSA);
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/* Disable MSA & FPU */
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disable_msa();
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if (vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU) {
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clear_c0_status(ST0_CU1 | ST0_FR);
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disable_fpu_hazard();
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}
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vcpu->arch.aux_inuse &= ~(KVM_MIPS_AUX_FPU | KVM_MIPS_AUX_MSA);
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} else if (vcpu->arch.aux_inuse & KVM_MIPS_AUX_FPU) {
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if (!IS_ENABLED(CONFIG_KVM_MIPS_VZ)) {
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set_c0_status(ST0_CU1);
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enable_fpu_hazard();
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}
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__kvm_save_fpu(&vcpu->arch);
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vcpu->arch.aux_inuse &= ~KVM_MIPS_AUX_FPU;
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trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_FPU);
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/* Disable FPU */
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clear_c0_status(ST0_CU1 | ST0_FR);
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disable_fpu_hazard();
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}
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preempt_enable();
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}
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/*
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* Step over a specific ctc1 to FCSR and a specific ctcmsa to MSACSR which are
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* used to restore guest FCSR/MSACSR state and may trigger a "harmless" FP/MSAFP
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* exception if cause bits are set in the value being written.
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*/
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static int kvm_mips_csr_die_notify(struct notifier_block *self,
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unsigned long cmd, void *ptr)
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{
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struct die_args *args = (struct die_args *)ptr;
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struct pt_regs *regs = args->regs;
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unsigned long pc;
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/* Only interested in FPE and MSAFPE */
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if (cmd != DIE_FP && cmd != DIE_MSAFP)
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return NOTIFY_DONE;
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/* Return immediately if guest context isn't active */
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if (!(current->flags & PF_VCPU))
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return NOTIFY_DONE;
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/* Should never get here from user mode */
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BUG_ON(user_mode(regs));
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pc = instruction_pointer(regs);
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switch (cmd) {
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case DIE_FP:
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/* match 2nd instruction in __kvm_restore_fcsr */
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if (pc != (unsigned long)&__kvm_restore_fcsr + 4)
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return NOTIFY_DONE;
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break;
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case DIE_MSAFP:
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/* match 2nd/3rd instruction in __kvm_restore_msacsr */
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if (!cpu_has_msa ||
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pc < (unsigned long)&__kvm_restore_msacsr + 4 ||
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pc > (unsigned long)&__kvm_restore_msacsr + 8)
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return NOTIFY_DONE;
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break;
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}
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/* Move PC forward a little and continue executing */
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instruction_pointer(regs) += 4;
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return NOTIFY_STOP;
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}
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static struct notifier_block kvm_mips_csr_die_notifier = {
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.notifier_call = kvm_mips_csr_die_notify,
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};
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static int __init kvm_mips_init(void)
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{
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int ret;
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ret = kvm_mips_entry_setup();
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if (ret)
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return ret;
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ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
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if (ret)
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return ret;
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register_die_notifier(&kvm_mips_csr_die_notifier);
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return 0;
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}
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static void __exit kvm_mips_exit(void)
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{
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kvm_exit();
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unregister_die_notifier(&kvm_mips_csr_die_notifier);
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}
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module_init(kvm_mips_init);
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module_exit(kvm_mips_exit);
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EXPORT_TRACEPOINT_SYMBOL(kvm_exit);
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