Copying an ASID into new vCPUs will not work for SEV-ES since the vCPUs
VMSAs need to be setup and measured before SEV_LAUNCH_FINISH. Return an
error if a users tries to KVM_CAP_VM_COPY_ENC_CONTEXT_FROM from an
SEV-ES guest.
Fixes: 54526d1fd593 ("KVM: x86: Support KVM VMs sharing SEV context")
Signed-off-by: Peter Gonda <pgonda@xxxxxxxxxx>
Cc: Marc Orr <marcorr@xxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
Cc: Nathan Tempelman <natet@xxxxxxxxxx>
Cc: Brijesh Singh <brijesh.singh@xxxxxxx>
Cc: kvm@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
arch/x86/kvm/svm/sev.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 75e0b21ad07c..8a279027425f 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -1728,7 +1728,7 @@ int svm_vm_copy_asid_from(struct kvm *kvm, unsigned int source_fd)
source_kvm = source_kvm_file->private_data;
mutex_lock(&source_kvm->lock);
- if (!sev_guest(source_kvm)) {
+ if (!sev_guest(source_kvm) || sev_es_guest(source_kvm)) {
ret = -EINVAL;
goto e_source_unlock;
}
--
2.33.0.309.g3052b89438-goog
