[PATCH 03/11] KVM: SVM: Check for nested intercepts on NMI injection

Joerg Roedel
2010-02-24T18:01:56Z

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