* [PATCH 1/2] KVM: x86: Terminate early if task_switch_16/32 failed
@ 2010-04-14 13:50 Jan Kiszka
0 siblings, 0 replies; only message in thread
From: Jan Kiszka @ 2010-04-14 13:50 UTC (permalink / raw)
To: Avi Kivity, Marcelo Tosatti; +Cc: kvm, Gleb Natapov
Stop the switch immediately if task_switch_16/32 returned an error. Only
if that step succeeded, the switch should actually take place and update
any register states.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
arch/x86/kvm/emulate.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 083b269..aace565 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2402,6 +2402,8 @@ static int emulator_do_task_switch(struct x86_emulate_ctxt *ctxt,
else
ret = task_switch_16(ctxt, ops, tss_selector, old_tss_sel,
old_tss_base, &next_tss_desc);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE)
ctxt->eflags = ctxt->eflags | X86_EFLAGS_NT;
^ permalink raw reply related [flat|nested] only message in thread
only message in thread, other threads:[~2010-04-14 13:51 UTC | newest]
Thread overview: (only message) (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2010-04-14 13:50 [PATCH 1/2] KVM: x86: Terminate early if task_switch_16/32 failed Jan Kiszka
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox