From 1164e667cfe2c6cbccd04a5b05be9a03c4f1dc2c Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Mon, 2 May 2022 00:07:28 +0200 Subject: [PATCH] KVM: SVM: Stuff next_rip on emulated INT3 injection if NRIPS is supported 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 Fixes: 397076fd8c2e ("KVM: SVM: Emulate nRIP feature when reinjecting INT3") Signed-off-by: Sean Christopherson Signed-off-by: Maciej S. Szmigiero Message-Id: Signed-off-by: Paolo Bonzini --- 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 c1506069e67cf..8c3c6bba6ccd8 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; } @@ -3709,7 +3713,7 @@ 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. -- 2.39.5