Don't inject PV async #PFs into guests with protected register state, i.e.
SEV-ES and SEV-SNP guests, unless the guest has opted-in to receiving #PFs
at CPL0. For protected guests, the actual CPL of the guest is unknown.
Note, no sane CoCo guest should enable PV async #PF, but the current state
of Linux-as-a-CoCo-guest isn't entirely sane.
Fixes: add5e2f04541 ("KVM: SVM: Add support for the SEV-ES VMSA")
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
arch/x86/kvm/x86.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 58b82d6fd77c..3b67425c3e3d 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -13395,7 +13395,7 @@ static bool kvm_can_deliver_async_pf(struct kvm_vcpu *vcpu)
return false;
if (vcpu->arch.apf.send_user_only &&
- kvm_x86_call(get_cpl)(vcpu) == 0)
+ (vcpu->arch.guest_state_protected || !kvm_x86_call(get_cpl)(vcpu)))
return false;
if (is_guest_mode(vcpu)) {
--
2.48.1.601.g30ceb7b040-goog
