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Message-Id: <1406202684-5226-2-git-send-email-namit@cs.technion.ac.il>
Date: Thu, 24 Jul 2014 14:51:23 +0300
From: Nadav Amit <namit@...technion.ac.il>
To: pbonzini@...hat.com
Cc: gleb@...nel.org, tglx@...utronix.de, mingo@...hat.com,
hpa@...or.com, x86@...nel.org, linux-kernel@...r.kernel.org,
nadav.amit@...il.com, Nadav Amit <namit@...technion.ac.il>
Subject: [PATCH 1/2] 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@...technion.ac.il>
---
arch/x86/kvm/emulate.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
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;
--
1.9.1
--
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