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KVM: SVM: Skip instruction on a task switch only when appropriate

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If a task switch was initiated because off a task gate in IDT and IDT
was accessed because of an external even the instruction should not
be skipped.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2009-04-12 13:37:02 +03:00 committed by Avi Kivity
parent ba8afb6b0a
commit 8317c298ea
1 changed files with 9 additions and 2 deletions
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11
arch/x86/kvm/svm.c
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@ -1828,6 +1828,7 @@ static int task_switch_interception(struct vcpu_svm *svm,
int reason;
int int_type = svm->vmcb->control.exit_int_info &
SVM_EXITINTINFO_TYPE_MASK;
int int_vec = svm->vmcb->control.exit_int_info & SVM_EVTINJ_VEC_MASK;
tss_selector = (u16)svm->vmcb->control.exit_info_1;
@ -1843,8 +1844,14 @@ static int task_switch_interception(struct vcpu_svm *svm,
reason = TASK_SWITCH_CALL;
if (reason != TASK_SWITCH_GATE || int_type == SVM_EXITINTINFO_TYPE_SOFT)
skip_emulated_instruction(&svm->vcpu);
if (reason != TASK_SWITCH_GATE ||
int_type == SVM_EXITINTINFO_TYPE_SOFT ||
(int_type == SVM_EXITINTINFO_TYPE_EXEPT &&
(int_vec == OF_VECTOR || int_vec == BP_VECTOR))) {
if (emulate_instruction(&svm->vcpu, kvm_run, 0, 0,
EMULTYPE_SKIP) != EMULATE_DONE)
return 0;
}
return kvm_task_switch(&svm->vcpu, tss_selector, reason);
}