diff options
| author | Nadav Amit <namit@cs.technion.ac.il> | 2014-07-24 11:51:23 (GMT) |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-07-24 12:03:54 (GMT) |
| commit | b9a1ecb909e8f772934cc4bf1f164124c9fbb0d0 (patch) | |
| tree | 601e3dac423c8528adb089df01cedb37e7416e88 | |
| parent | c756ad036fc8ef432438e89aab63cc723eda39b4 (diff) | |
| download | linux-b9a1ecb909e8f772934cc4bf1f164124c9fbb0d0.tar.xz | |
KVM: x86: Setting rflags.rf during rep-string emulation
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>
| -rw-r--r-- | arch/x86/kvm/emulate.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 8d41556..57743ed 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -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; |