On 08/24/2010 02:30 PM, Gleb Natapov wrote:
Signed-off-by: Gleb Natapov<gleb@xxxxxxxxxx>
---
arch/x86/kvm/emulate.c | 42 +++++++++++++++++++++++++++++-------------
1 files changed, 29 insertions(+), 13 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index f9f8353..d34d706 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2921,6 +2921,32 @@ done:
return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0;
}
+static bool string_inst_completed(struct x86_emulate_ctxt *ctxt)
s/inst/insn/.
+{
+ struct decode_cache *c =&ctxt->decode;
+
+ /* All REP prefixes have the same first termination condition */
+ if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0)
+ return true;
This is checked during the beginning of the instruction, not after
completion. Why is it here? it will just be duplicated.
+
+ /* The second termination condition only applies for REPE
+ * and REPNE. Test if the repeat string operation prefix is
+ * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the
+ * corresponding termination condition according to:
+ * - if REPE/REPZ and ZF = 0 then done
+ * - if REPNE/REPNZ and ZF = 1 then done
+ */
+ if (((c->b == 0xa6) || (c->b == 0xa7) ||
+ (c->b == 0xae) || (c->b == 0xaf))
+ && (((c->rep_prefix == REPE_PREFIX)&&
+ ((ctxt->eflags& EFLG_ZF) == 0))
+ || ((c->rep_prefix == REPNE_PREFIX)&&
+ ((ctxt->eflags& EFLG_ZF) == EFLG_ZF))))
+ return true;
+
+ return false;
+}
+
--
error compiling committee.c: too many arguments to function
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