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KVM: nSVM: Omit SEV-ES specific passthrough MSRs from L0+L1 bitmap merge

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Don't merge bitmaps on nested VMRUN for MSRs that KVM passes through only
for SEV-ES guests.  KVM doesn't support nested virtualization for SEV-ES,
and likely never will.

Link: https://lore.kernel.org/r/20250610225737.156318-12-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2025-06-10 15:57:16 -07:00
parent 9b72c3d59f
commit f21ff2c8c9
1 changed files with 1 additions and 8 deletions
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9
arch/x86/kvm/svm/nested.c
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@@ -194,7 +194,7 @@ void recalc_intercepts(struct vcpu_svm *svm)
* Hardcode the capacity of the array based on the maximum number of _offsets_.
* MSRs are batched together, so there are fewer offsets than MSRs.
*/
static int nested_svm_msrpm_merge_offsets[9] __ro_after_init;
static int nested_svm_msrpm_merge_offsets[6] __ro_after_init;
static int nested_svm_nr_msrpm_merge_offsets __ro_after_init;
int __init nested_svm_init_msrpm_merge_offsets(void)
@@ -219,13 +219,6 @@ int __init nested_svm_init_msrpm_merge_offsets(void)
MSR_IA32_LASTBRANCHTOIP,
MSR_IA32_LASTINTFROMIP,
MSR_IA32_LASTINTTOIP,
MSR_IA32_DEBUGCTLMSR,
MSR_IA32_XSS,
MSR_EFER,
MSR_IA32_CR_PAT,
MSR_AMD64_SEV_ES_GHCB,
MSR_TSC_AUX,
};
int i, j;