Instead of syncing the guest cr3 every exit, which is expensince on vmx with ept enabled, sync it only on demand. Signed-off-by: Avi Kivity <avi@xxxxxxxxxx> --- arch/x86/include/asm/kvm_host.h | 2 ++ arch/x86/kvm/kvm_cache_regs.h | 2 ++ arch/x86/kvm/svm.c | 5 +++++ arch/x86/kvm/vmx.c | 17 +++++++++++------ 4 files changed, 20 insertions(+), 6 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index cfbcbfa..4bd8daa 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -117,6 +117,7 @@ enum kvm_reg { enum kvm_reg_ex { VCPU_EXREG_PDPTR = NR_VCPU_REGS, + VCPU_EXREG_CR3, }; enum { @@ -532,6 +533,7 @@ struct kvm_x86_ops { struct kvm_segment *var, int seg); void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l); void (*decache_cr0_guest_bits)(struct kvm_vcpu *vcpu); + void (*decache_cr3)(struct kvm_vcpu *vcpu); void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu); void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0); void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3); diff --git a/arch/x86/kvm/kvm_cache_regs.h b/arch/x86/kvm/kvm_cache_regs.h index a6bf8db..3377d53 100644 --- a/arch/x86/kvm/kvm_cache_regs.h +++ b/arch/x86/kvm/kvm_cache_regs.h @@ -75,6 +75,8 @@ static inline ulong kvm_read_cr4_bits(struct kvm_vcpu *vcpu, ulong mask) static inline ulong kvm_read_cr3(struct kvm_vcpu *vcpu) { + if (!test_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail)) + kvm_x86_ops->decache_cr3(vcpu); return vcpu->arch.cr3; } diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 5e4b120..91af472 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1286,6 +1286,10 @@ static void svm_decache_cr0_guest_bits(struct kvm_vcpu *vcpu) { } +static void svm_decache_cr3(struct kvm_vcpu *vcpu) +{ +} + static void svm_decache_cr4_guest_bits(struct kvm_vcpu *vcpu) { } @@ -3683,6 +3687,7 @@ static struct kvm_x86_ops svm_x86_ops = { .get_cpl = svm_get_cpl, .get_cs_db_l_bits = kvm_get_cs_db_l_bits, .decache_cr0_guest_bits = svm_decache_cr0_guest_bits, + .decache_cr3 = svm_decache_cr3, .decache_cr4_guest_bits = svm_decache_cr4_guest_bits, .set_cr0 = svm_set_cr0, .set_cr3 = svm_set_cr3, diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 92f2c72..8d7b85a 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -1817,6 +1817,14 @@ static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu) vcpu->arch.cr0 |= vmcs_readl(GUEST_CR0) & cr0_guest_owned_bits; } +static void vmx_decache_cr3(struct kvm_vcpu *vcpu) +{ + /* Can only be called with EPT enabled */ + if (enable_ept) + vcpu->arch.cr3 = vmcs_readl(GUEST_CR3); + __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail); +} + static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu) { ulong cr4_guest_owned_bits = vcpu->arch.cr4_guest_owned_bits; @@ -3713,11 +3721,6 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu) if (vmx->emulation_required && emulate_invalid_guest_state) return handle_invalid_guest_state(vcpu); - /* Access CR3 don't cause VMExit in paging mode, so we need - * to sync with guest real CR3. */ - if (enable_ept && is_paging(vcpu)) - vcpu->arch.cr3 = vmcs_readl(GUEST_CR3); - if (exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY) { vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY; vcpu->run->fail_entry.hardware_entry_failure_reason @@ -4034,7 +4037,8 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu) ); vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP) - | (1 << VCPU_EXREG_PDPTR)); + | (1 << VCPU_EXREG_PDPTR) + | (1 << VCPU_EXREG_CR3)); vcpu->arch.regs_dirty = 0; vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD); @@ -4306,6 +4310,7 @@ static struct kvm_x86_ops vmx_x86_ops = { .get_cpl = vmx_get_cpl, .get_cs_db_l_bits = vmx_get_cs_db_l_bits, .decache_cr0_guest_bits = vmx_decache_cr0_guest_bits, + .decache_cr3 = vmx_decache_cr3, .decache_cr4_guest_bits = vmx_decache_cr4_guest_bits, .set_cr0 = vmx_set_cr0, .set_cr3 = vmx_set_cr3, -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html