EXPORT_SYMBOL_GPL(kvm_emulate_rdpmc);
/*
- * List of msr numbers which we expose to userspace through KVM_GET_MSRS
- * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
- *
- * The three MSR lists(msrs_to_save, emulated_msrs, msr_based_features)
- * extract the supported MSRs from the related const lists.
- * msrs_to_save is selected from the msrs_to_save_all to reflect the
- * capabilities of the host cpu. This capabilities test skips MSRs that are
- * kvm-specific. Those are put in emulated_msrs_all; filtering of emulated_msrs
- * may depend on host virtualization features rather than host cpu features.
+ * The three MSR lists(msrs_to_save, emulated_msrs, msr_based_features) track
+ * the set of MSRs that KVM exposes to userspace through KVM_GET_MSRS,
+ * KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST. msrs_to_save holds MSRs that
+ * require host support, i.e. should be probed via RDMSR. emulated_msrs holds
+ * MSRs that KVM emulates without strictly requiring host support.
+ * msr_based_features holds MSRs that enumerate features, i.e. are effectively
+ * CPUID leafs. Note, msr_based_features isn't mutually exclusive with
+ * msrs_to_save and emulated_msrs.
*/
static const u32 msrs_to_save_base[] = {
MSR_IA32_UCODE_REV,
/*
- * The following list leaves out MSRs whose values are determined
- * by arch/x86/kvm/vmx/nested.c based on CPUID or other MSRs.
- * We always support the "true" VMX control MSRs, even if the host
- * processor does not, so I am putting these registers here rather
- * than in msrs_to_save_all.
+ * KVM always supports the "true" VMX control MSRs, even if the host
+ * does not. The VMX MSRs as a whole are considered "emulated" as KVM
+ * doesn't strictly require them to exist in the host (ignoring that
+ * KVM would refuse to load in the first place if the core set of MSRs
+ * aren't supported).
*/
MSR_IA32_VMX_BASIC,
MSR_IA32_VMX_TRUE_PINBASED_CTLS,