diff options
| author | Sean Christopherson <seanjc@google.com> | 2025-06-03 01:44:59 +0300 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2025-06-24 22:20:15 +0300 |
| commit | 48f15f624189762e7ff2d95bcbb68e21c2d56077 (patch) | |
| tree | b6ce5a3227ac263d1279da51ff88de8f8902b966 | |
| parent | ecf371f8b02d5e31b9aa1da7f159f1b2107bdb01 (diff) | |
| download | linux-48f15f624189762e7ff2d95bcbb68e21c2d56077.tar.xz | |
KVM: SVM: Initialize vmsa_pa in VMCB to INVALID_PAGE if VMSA page is NULL
When creating an SEV-ES vCPU for intra-host migration, set its vmsa_pa to
INVALID_PAGE to harden against doing VMRUN with a bogus VMSA (KVM checks
for a valid VMSA page in pre_sev_run()).
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Tested-by: Liam Merwick <liam.merwick@oracle.com>
Link: https://lore.kernel.org/r/20250602224459.41505-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
| -rw-r--r-- | arch/x86/kvm/svm/sev.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 65d1597c3fed..b201f77fcd49 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -4449,8 +4449,12 @@ static void sev_es_init_vmcb(struct vcpu_svm *svm) * the VMSA will be NULL if this vCPU is the destination for intrahost * migration, and will be copied later. */ - if (svm->sev_es.vmsa && !svm->sev_es.snp_has_guest_vmsa) - svm->vmcb->control.vmsa_pa = __pa(svm->sev_es.vmsa); + if (!svm->sev_es.snp_has_guest_vmsa) { + if (svm->sev_es.vmsa) + svm->vmcb->control.vmsa_pa = __pa(svm->sev_es.vmsa); + else + svm->vmcb->control.vmsa_pa = INVALID_PAGE; + } if (cpu_feature_enabled(X86_FEATURE_ALLOWED_SEV_FEATURES)) svm->vmcb->control.allowed_sev_features = sev->vmsa_features | |