KVM: SVM: Fix wrong interrupt injection in enable_irq_windows
The nested_svm_intr() function does not execute the vmexit
anymore. Therefore we may still be in the nested state after
that function ran. This patch changes the nested_svm_intr()
function to return wether the irq window could be enabled.
Cc: stable@kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index a8ec53f..294bbca 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1432,16 +1432,17 @@
return vmexit;
}
-static inline int nested_svm_intr(struct vcpu_svm *svm)
+/* This function returns true if it is save to enable the irq window */
+static inline bool nested_svm_intr(struct vcpu_svm *svm)
{
if (!is_nested(svm))
- return 0;
+ return true;
if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
- return 0;
+ return true;
if (!(svm->vcpu.arch.hflags & HF_HIF_MASK))
- return 0;
+ return false;
svm->vmcb->control.exit_code = SVM_EXIT_INTR;
@@ -1454,10 +1455,10 @@
*/
svm->nested.exit_required = true;
trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip);
- return 1;
+ return false;
}
- return 0;
+ return true;
}
static void *nested_svm_map(struct vcpu_svm *svm, u64 gpa, struct page **_page)
@@ -2629,13 +2630,11 @@
{
struct vcpu_svm *svm = to_svm(vcpu);
- nested_svm_intr(svm);
-
/* In case GIF=0 we can't rely on the CPU to tell us when
* GIF becomes 1, because that's a separate STGI/VMRUN intercept.
* The next time we get that intercept, this function will be
* called again though and we'll get the vintr intercept. */
- if (gif_set(svm)) {
+ if (gif_set(svm) && nested_svm_intr(svm)) {
svm_set_vintr(svm);
svm_inject_irq(svm, 0x0);
}
