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KVM: SNP: Fix LBR Virtualization for SNP guest

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SEV-ES and thus SNP guest mandates LBR Virtualization to be _always_ ON.
Although commit b7e4be0a22 ("KVM: SEV-ES: Delegate LBR virtualization
to the processor") did the correct change for SEV-ES guests, it missed
the SNP. Fix it.

Reported-by: Srikanth Aithal <sraithal@amd.com>
Fixes: b7e4be0a22 ("KVM: SEV-ES: Delegate LBR virtualization to the processor")
Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Message-ID: <20240605114810.1304-1-ravi.bangoria@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Ravi Bangoria 2024-06-05 11:48:10 +00:00 committed by Paolo Bonzini
parent ab978c62e7
commit f99b052256
1 changed files with 8 additions and 0 deletions
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8
arch/x86/kvm/svm/sev.c
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@ -2402,6 +2402,14 @@ static int snp_launch_update_vmsa(struct kvm *kvm, struct kvm_sev_cmd *argp)
}
svm->vcpu.arch.guest_state_protected = true;
/*
* SEV-ES (and thus SNP) guest mandates LBR Virtualization to
* be _always_ ON. Enable it only after setting
* guest_state_protected because KVM_SET_MSRS allows dynamic
* toggling of LBRV (for performance reason) on write access to
* MSR_IA32_DEBUGCTLMSR when guest_state_protected is not set.
*/
svm_enable_lbrv(vcpu);
}
return 0;