From: Sean Christopherson <seanjc@xxxxxxxxxx>
If NRIPS is supported in hardware but disabled in KVM, set next_rip to
the next RIP when advancing RIP as part of emulating INT3 injection.
There is no flag to tell the CPU that KVM isn't using next_rip, and so
leaving next_rip is left as is will result in the CPU pushing garbage
onto the stack when vectoring the injected event.
Reviewed-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
Fixes: 66b7138f9136 ("KVM: SVM: Emulate nRIP feature when reinjecting INT3")
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@xxxxxxxxxx>
---
arch/x86/kvm/svm/svm.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 1a719f47a964..a05a4e521400 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -392,6 +392,10 @@ static void svm_queue_exception(struct kvm_vcpu *vcpu)
*/
(void)svm_skip_emulated_instruction(vcpu);
rip = kvm_rip_read(vcpu);
+
+ if (boot_cpu_has(X86_FEATURE_NRIPS))
+ svm->vmcb->control.next_rip = rip;
+
svm->int3_rip = rip + svm->vmcb->save.cs.base;
svm->int3_injected = rip - old_rip;
}
@@ -3701,7 +3705,7 @@ static void svm_complete_interrupts(struct kvm_vcpu *vcpu)
/*
* If NextRIP isn't enabled, KVM must manually advance RIP prior to
* injecting the soft exception/interrupt. That advancement needs to
- * be unwound if vectoring didn't complete. Note, the _new_ event may
+ * be unwound if vectoring didn't complete. Note, the new event may
* not be the injected event, e.g. if KVM injected an INTn, the INTn
* hit a #NP in the guest, and the #NP encountered a #PF, the #NP will
* be the reported vectored event, but RIP still needs to be unwound.
