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| author | Jan Kiszka <jan.kiszka@siemens.com> | 2011-10-18 18:23:11 +0200 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2011-10-27 10:40:46 -0200 |
| commit | 15649916aba1fd0784ce490a65294c23a758a564 (patch) | |
| tree | 90ab0b7c09a3ecd6994dc159dad8550eebc0e9f2 | |
| parent | cc526cf0fcff1ded77771706950522b44f5affbe (diff) | |
| download | kvm-15649916aba1fd0784ce490a65294c23a758a564.tar.gz | |
KVM: SVM: Keep intercepting task switching with NPT enabled
AMD processors apparently have a bug in the hardware task switching
support when NPT is enabled. If the task switch triggers a NPF, we can
get wrong EXITINTINFO along with that fault. On resume, spurious
exceptions may then be injected into the guest.
We were able to reproduce this bug when our guest triggered #SS and the
handler were supposed to run over a separate task with not yet touched
stack pages.
Work around the issue by continuing to emulate task switches even in
NPT mode.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
| -rw-r--r-- | arch/x86/kvm/svm.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index e7ed4b1623b96..e32243eac2f48 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1084,7 +1084,6 @@ static void init_vmcb(struct vcpu_svm *svm) if (npt_enabled) { /* Setup VMCB for Nested Paging */ control->nested_ctl = 1; - clr_intercept(svm, INTERCEPT_TASK_SWITCH); clr_intercept(svm, INTERCEPT_INVLPG); clr_exception_intercept(svm, PF_VECTOR); clr_cr_intercept(svm, INTERCEPT_CR3_READ); |