Messages in this thread Patch in this message | | | From | Joerg Roedel <> | Subject | [PATCH 03/11] KVM: SVM: Check for nested intercepts on NMI injection | Date | Wed, 24 Feb 2010 18:59:12 +0100 |
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This patch implements the NMI intercept checking for nested svm.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> --- arch/x86/kvm/svm.c | 22 +++++++++++++++++++--- 1 files changed, 19 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index b821b2f..9759d9f 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1480,6 +1480,20 @@ static inline bool nested_svm_intr(struct vcpu_svm *svm) return true; } +/* This function returns true if it is save to enable the nmi window */ +static inline bool nested_svm_nmi(struct vcpu_svm *svm) +{ + if (!is_nested(svm)) + return true; + + if (!(svm->nested.intercept & (1ULL << INTERCEPT_NMI))) + return true; + + svm->vmcb->control.exit_code = SVM_EXIT_NMI; + svm->nested.exit_required = true; + + return false; +} static void *nested_svm_map(struct vcpu_svm *svm, u64 gpa, struct page **_page) { struct page *page; @@ -2681,9 +2695,11 @@ static void enable_nmi_window(struct kvm_vcpu *vcpu) * Something prevents NMI from been injected. Single step over possible * problem (IRET or exception injection or interrupt shadow) */ - svm->nmi_singlestep = true; - svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF); - update_db_intercept(vcpu); + if (gif_set(svm) && nested_svm_nmi(svm)) { + svm->nmi_singlestep = true; + svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF); + update_db_intercept(vcpu); + } } static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr) -- 1.7.0
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