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KVM: x86: Terminate early if task_switch_16/32 failed

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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>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka 2010-04-14 15:50:57 +02:00 committed by Avi Kivity
parent 8f6abd06f5
commit 0760d44868
1 changed files with 2 additions and 0 deletions
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arch/x86/kvm/emulate.c
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@ -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;