From 8317c298eab14cc20e2de5289743ff0d4c5a6b30 Mon Sep 17 00:00:00 2001 From: Gleb Natapov Date: Sun, 12 Apr 2009 13:37:02 +0300 Subject: [PATCH] KVM: SVM: Skip instruction on a task switch only when appropriate 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 Signed-off-by: Avi Kivity --- arch/x86/kvm/svm.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index bba67b70c4b0..8fc6eea148e7 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -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); } -- 2.20.1