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linux-sg2042
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KVM: x86 emulator: Fix HLT instruction 

This patch fixes issue encountered with HLT instruction
under FreeDOS's HIMEM XMS Driver.

The HLT instruction jumped directly to the done label and
skips updating the EIP value, therefore causing the guest
to spin endlessly on the same instruction.

The patch changes the instruction so that it writes back
the updated EIP value.

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Mohammed Gamal 2008-07-06 16:51:26 +03:00 committed by Avi Kivity
parent ac9f6dc0db
commit 19fdfa0d13
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/x86_emulate.c
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@ -1731,7 +1731,7 @@ special_insn:
break; break;
case 0xf4: /* hlt */ case 0xf4: /* hlt */
ctxt->vcpu->arch.halt_request = 1; ctxt->vcpu->arch.halt_request = 1;
goto done; break;
case 0xf5: /* cmc */ case 0xf5: /* cmc */
/* complement carry flag from eflags reg */ /* complement carry flag from eflags reg */
ctxt->eflags ^= EFLG_CF; ctxt->eflags ^= EFLG_CF;