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From: Joerg Roedel on 19 Feb 2010 10:30
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(a)kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel(a)amd.com>
---
arch/x86/kvm/svm.c | 17 ++++++++---------
1 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 63ecd4d..f87fc98 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1389,16 +1389,17 @@ static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
return nested_svm_exit_handled(svm);
}

-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;

@@ -1411,10 +1412,10 @@ static inline int nested_svm_intr(struct vcpu_svm *svm)
*/
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)
@@ -2563,13 +2564,11 @@ static void enable_irq_window(struct kvm_vcpu *vcpu)
{
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);
}
--
1.6.6


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Prev: staging: remove unused methods
Next: [PATCH 05/11] KVM: SVM: Annotate nested_svm_map with might_sleep()