diff options
| author | Ravi Bangoria <[email protected]> | 2024-06-05 11:48:10 +0000 |
|---|---|---|
| committer | Paolo Bonzini <[email protected]> | 2024-06-05 07:50:50 -0400 |
| commit | f99b052256f16224687e5947772f0942bff73fc1 (patch) | |
| tree | 32ad1669fb76e6d89e26152080bc9ee402bf1589 | |
| parent | ab978c62e72d6b2d41842210e0cc435d9ed0dadb (diff) | |
KVM: SNP: Fix LBR Virtualization for SNP guest
SEV-ES and thus SNP guest mandates LBR Virtualization to be _always_ ON.
Although commit b7e4be0a224f ("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 <[email protected]>
Fixes: b7e4be0a224f ("KVM: SEV-ES: Delegate LBR virtualization to the processor")
Signed-off-by: Ravi Bangoria <[email protected]>
Message-ID: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
| -rw-r--r-- | arch/x86/kvm/svm/sev.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 113243daa3d6..df8818759698 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -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; |