From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Subject: [PATCH 1/9] KVM: SVM: Notify nested hypervisor of lost event injections Date: Fri, 9 Oct 2009 16:08:25 +0200 Message-ID: <1255097313-23267-2-git-send-email-joerg.roedel@amd.com> References: <1255097313-23267-1-git-send-email-joerg.roedel@amd.com> Mime-Version: 1.0 Content-Type: text/plain Cc: Alexander Graf , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Joerg Roedel To: Avi Kivity , Marcelo Tosatti Return-path: In-Reply-To: <1255097313-23267-1-git-send-email-joerg.roedel@amd.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org From: Alexander Graf If event_inj is valid on a #vmexit the host CPU would write the contents to exit_int_info, so the hypervisor knows that the event wasn't injected. We don't do this in nested SVM by now which is a bug and fixed by this patch. Signed-off-by: Alexander Graf Signed-off-by: Joerg Roedel --- arch/x86/kvm/svm.c | 16 ++++++++++++++++ 1 files changed, 16 insertions(+), 0 deletions(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 279a2ae..e372854 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1615,6 +1615,22 @@ static int nested_svm_vmexit(struct vcpu_svm *svm) nested_vmcb->control.exit_info_2 = vmcb->control.exit_info_2; nested_vmcb->control.exit_int_info = vmcb->control.exit_int_info; nested_vmcb->control.exit_int_info_err = vmcb->control.exit_int_info_err; + + /* + * If we emulate a VMRUN/#VMEXIT in the same host #vmexit cycle we have + * to make sure that we do not lose injected events. So check event_inj + * here and copy it to exit_int_info if it is valid. + * Exit_int_info and event_inj can't be both valid because the case + * below only happens on a VMRUN instruction intercept which has + * no valid exit_int_info set. + */ + if (vmcb->control.event_inj & SVM_EVTINJ_VALID) { + struct vmcb_control_area *nc = &nested_vmcb->control; + + nc->exit_int_info = vmcb->control.event_inj; + nc->exit_int_info_err = vmcb->control.event_inj_err; + } + nested_vmcb->control.tlb_ctl = 0; nested_vmcb->control.event_inj = 0; nested_vmcb->control.event_inj_err = 0; -- 1.6.4.3