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KVM: x86: Setting rflags.rf during rep-string emulation

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This patch updates RF for rep-string emulation.  The flag is set upon the first
iteration, and cleared after the last (if emulated). It is intended to make
sure that if a trap (in future data/io #DB emulation) or interrupt is delivered
to the guest during the rep-string instruction, RF will be set correctly. RF
affects whether instruction breakpoint in the guest is masked.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Nadav Amit 2014-07-24 14:51:23 +03:00 committed by Paolo Bonzini
parent c756ad036f
commit b9a1ecb909
1 changed files with 5 additions and 1 deletions
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6
arch/x86/kvm/emulate.c
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@ -4683,7 +4683,10 @@ special_insn:
goto done;
}
ctxt->eflags &= ~EFLG_RF;
if (ctxt->rep_prefix && (ctxt->d & String))
ctxt->eflags |= EFLG_RF;
else
ctxt->eflags &= ~EFLG_RF;
if (ctxt->execute) {
if (ctxt->d & Fastop) {
@ -4824,6 +4827,7 @@ writeback:
}
goto done; /* skip rip writeback */
}
ctxt->eflags &= ~EFLG_RF;
}
ctxt->eip = ctxt->_eip;