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KVM: x86: Add macros to track first...last VMX feature MSRs

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Add macros to track the range of VMX feature MSRs that are emulated by
KVM to reduce the maintenance cost of extending the set of emulated MSRs.

Note, KVM doesn't necessarily emulate all known/consumed VMX MSRs, e.g.
PROCBASED_CTLS3 is consumed by KVM to enable IPI virtualization, but is
not emulated as KVM doesn't emulate/virtualize IPI virtualization for
nested guests.

No functional change intended.

Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://lore.kernel.org/r/20230311004618.920745-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2023-03-10 16:46:00 -08:00
parent fb3146b4dc
commit 5757f5b956
3 changed files with 13 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/kvm/svm/svm.c
View File

@ -4124,7 +4124,7 @@ static bool svm_has_emulated_msr(struct kvm *kvm, u32 index)
{
switch (index) {
case MSR_IA32_MCG_EXT_CTL:
case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC:
case KVM_FIRST_EMULATED_VMX_MSR ... KVM_LAST_EMULATED_VMX_MSR:
return false;
case MSR_IA32_SMBASE:
if (!IS_ENABLED(CONFIG_KVM_SMM))

8
arch/x86/kvm/vmx/vmx.c
View File

@ -1945,7 +1945,7 @@ static inline bool is_vmx_feature_control_msr_valid(struct vcpu_vmx *vmx,
static int vmx_get_msr_feature(struct kvm_msr_entry *msr)
{
switch (msr->index) {
case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC:
case KVM_FIRST_EMULATED_VMX_MSR ... KVM_LAST_EMULATED_VMX_MSR:
if (!nested)
return 1;
return vmx_get_vmx_msr(&vmcs_config.nested, msr->index, &msr->data);
@ -2030,7 +2030,7 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
msr_info->data = to_vmx(vcpu)->msr_ia32_sgxlepubkeyhash
[msr_info->index - MSR_IA32_SGXLEPUBKEYHASH0];
break;
case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC:
case KVM_FIRST_EMULATED_VMX_MSR ... KVM_LAST_EMULATED_VMX_MSR:
if (!nested_vmx_allowed(vcpu))
return 1;
if (vmx_get_vmx_msr(&vmx->nested.msrs, msr_info->index,
@ -2384,7 +2384,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
vmx->msr_ia32_sgxlepubkeyhash
[msr_index - MSR_IA32_SGXLEPUBKEYHASH0] = data;
break;
case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC:
case KVM_FIRST_EMULATED_VMX_MSR ... KVM_LAST_EMULATED_VMX_MSR:
if (!msr_info->host_initiated)
return 1; /* they are read-only */
if (!nested_vmx_allowed(vcpu))
@ -6974,7 +6974,7 @@ static bool vmx_has_emulated_msr(struct kvm *kvm, u32 index)
* real mode.
*/
return enable_unrestricted_guest || emulate_invalid_guest_state;
case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC:
case KVM_FIRST_EMULATED_VMX_MSR ... KVM_LAST_EMULATED_VMX_MSR:
return nested;
case MSR_AMD64_VIRT_SPEC_CTRL:
case MSR_AMD64_TSC_RATIO:

8
arch/x86/kvm/x86.h
View File

@ -40,6 +40,14 @@ void kvm_spurious_fault(void);
failed; \
})
/*
* The first...last VMX feature MSRs that are emulated by KVM. This may or may
* not cover all known VMX MSRs, as KVM doesn't emulate an MSR until there's an
* associated feature that KVM supports for nested virtualization.
*/
#define KVM_FIRST_EMULATED_VMX_MSR MSR_IA32_VMX_BASIC
#define KVM_LAST_EMULATED_VMX_MSR MSR_IA32_VMX_VMFUNC
#define KVM_DEFAULT_PLE_GAP 128
#define KVM_VMX_DEFAULT_PLE_WINDOW 4096
#define KVM_DEFAULT_PLE_WINDOW_GROW 2