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KVM: VMX: Cache vmcs.EXIT_INTR_INFO using arch avail_reg flags

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Introduce a new "extended register" type, EXIT_INFO_2 (to pair with the
nomenclature in .get_exit_info()), and use it to cache VMX's
vmcs.EXIT_INTR_INFO.  Drop a comment in vmx_recover_nmi_blocking() that
is obsoleted by the generic caching mechanism.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200415203454.8296-6-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2020-04-15 13:34:54 -07:00 committed by Paolo Bonzini
parent 5addc23519
commit 8791585837
4 changed files with 27 additions and 18 deletions
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1
arch/x86/include/asm/kvm_host.h
View File

@ -171,6 +171,7 @@ enum kvm_reg {
VCPU_EXREG_RFLAGS,
VCPU_EXREG_SEGMENTS,
VCPU_EXREG_EXIT_INFO_1,
VCPU_EXREG_EXIT_INFO_2,
};
enum {

10
arch/x86/kvm/vmx/nested.c
View File

@ -5419,7 +5419,7 @@ static int handle_vmfunc(struct kvm_vcpu *vcpu)
fail:
nested_vmx_vmexit(vcpu, vmx->exit_reason,
vmcs_read32(VM_EXIT_INTR_INFO),
vmx_get_intr_info(vcpu),
vmx_get_exit_qual(vcpu));
return 1;
}
@ -5652,7 +5652,7 @@ static bool nested_vmx_l0_wants_exit(struct kvm_vcpu *vcpu, u32 exit_reason)
switch (exit_reason) {
case EXIT_REASON_EXCEPTION_NMI:
intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
intr_info = vmx_get_intr_info(vcpu);
if (is_nmi(intr_info))
return true;
else if (is_page_fault(intr_info))
@ -5708,12 +5708,12 @@ static bool nested_vmx_l0_wants_exit(struct kvm_vcpu *vcpu, u32 exit_reason)
*/
static bool nested_vmx_l1_wants_exit(struct kvm_vcpu *vcpu, u32 exit_reason)
{
u32 intr_info = vmx_get_intr_info(vcpu);
struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
u32 intr_info;
switch (exit_reason) {
case EXIT_REASON_EXCEPTION_NMI:
intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
intr_info = vmx_get_intr_info(vcpu);
if (is_nmi(intr_info))
return true;
else if (is_page_fault(intr_info))
@ -5848,7 +5848,7 @@ bool nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu)
goto reflect_vmexit;
}
exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
exit_intr_info = vmx_get_intr_info(vcpu);
exit_qual = vmx_get_exit_qual(vcpu);
trace_kvm_nested_vmexit(kvm_rip_read(vcpu), exit_reason, exit_qual,

20
arch/x86/kvm/vmx/vmx.c
View File

@ -5635,7 +5635,7 @@ static const int kvm_vmx_max_exit_handlers =
static void vmx_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2)
{
*info1 = vmx_get_exit_qual(vcpu);
*info2 = vmcs_read32(VM_EXIT_INTR_INFO);
*info2 = vmx_get_intr_info(vcpu);
}
static void vmx_destroy_pml_buffer(struct vcpu_vmx *vmx)
@ -6298,16 +6298,16 @@ static void vmx_apicv_post_state_restore(struct kvm_vcpu *vcpu)
static void handle_exception_nmi_irqoff(struct vcpu_vmx *vmx)
{
vmx->exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
u32 intr_info = vmx_get_intr_info(&vmx->vcpu);
/* if exit due to PF check for async PF */
if (is_page_fault(vmx->exit_intr_info)) {
if (is_page_fault(intr_info)) {
vmx->vcpu.arch.apf.host_apf_reason = kvm_read_and_reset_pf_reason();
/* Handle machine checks before interrupts are enabled */
} else if (is_machine_check(vmx->exit_intr_info)) {
} else if (is_machine_check(intr_info)) {
kvm_machine_check();
/* We need to handle NMIs before interrupts are enabled */
} else if (is_nmi(vmx->exit_intr_info)) {
} else if (is_nmi(intr_info)) {
kvm_before_interrupt(&vmx->vcpu);
asm("int $2");
kvm_after_interrupt(&vmx->vcpu);
@ -6322,9 +6322,8 @@ static void handle_external_interrupt_irqoff(struct kvm_vcpu *vcpu)
unsigned long tmp;
#endif
gate_desc *desc;
u32 intr_info;
u32 intr_info = vmx_get_intr_info(vcpu);
intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
if (WARN_ONCE(!is_external_intr(intr_info),
"KVM: unexpected VM-Exit interrupt info: 0x%x", intr_info))
return;
@ -6405,11 +6404,8 @@ static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx)
if (enable_vnmi) {
if (vmx->loaded_vmcs->nmi_known_unmasked)
return;
/*
* Can't use vmx->exit_intr_info since we're not sure what
* the exit reason is.
*/
exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
exit_intr_info = vmx_get_intr_info(&vmx->vcpu);
unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0;
vector = exit_intr_info & INTR_INFO_VECTOR_MASK;
/*

14
arch/x86/kvm/vmx/vmx.h
View File

@ -451,7 +451,8 @@ static inline void vmx_register_cache_reset(struct kvm_vcpu *vcpu)
| (1 << VCPU_EXREG_PDPTR)
| (1 << VCPU_EXREG_SEGMENTS)
| (1 << VCPU_EXREG_CR3)
| (1 << VCPU_EXREG_EXIT_INFO_1));
| (1 << VCPU_EXREG_EXIT_INFO_1)
| (1 << VCPU_EXREG_EXIT_INFO_2));
vcpu->arch.regs_dirty = 0;
}
@ -506,6 +507,17 @@ static inline unsigned long vmx_get_exit_qual(struct kvm_vcpu *vcpu)
return vmx->exit_qualification;
}
static inline u32 vmx_get_intr_info(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
if (!kvm_register_is_available(vcpu, VCPU_EXREG_EXIT_INFO_2)) {
kvm_register_mark_available(vcpu, VCPU_EXREG_EXIT_INFO_2);
vmx->exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
}
return vmx->exit_intr_info;
}
struct vmcs *alloc_vmcs_cpu(bool shadow, int cpu, gfp_t flags);
void free_vmcs(struct vmcs *vmcs);
int alloc_loaded_vmcs(struct loaded_vmcs *loaded_vmcs);