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KVM: x86: Fix update RCX/RDI/RSI on REP-string 

When REP-string instruction is preceded with an address-size prefix,
ECX/EDI/ESI are used as the operation counter and pointers.  When they are
updated, the high 32-bits of RCX/RDI/RSI are cleared, similarly to the way they
are updated on every 32-bit register operation.  Fix it.

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 2015-04-28 13:06:00 +03:00 committed by Paolo Bonzini
parent 3db176d5b4
commit ee122a7109
1 changed files with 2 additions and 6 deletions
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8
arch/x86/kvm/emulate.c
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@ -524,13 +524,9 @@ static void masked_increment(ulong *reg, ulong mask, int inc)
static inline void
register_address_increment(struct x86_emulate_ctxt *ctxt, int reg, int inc)
{
ulong mask;
ulong *preg = reg_rmw(ctxt, reg);
if (ctxt->ad_bytes == sizeof(unsigned long))
mask = ~0UL;
else
mask = ad_mask(ctxt);
masked_increment(reg_rmw(ctxt, reg), mask, inc);
assign_register(preg, *preg + inc, ctxt->ad_bytes);
}
static void rsp_increment(struct x86_emulate_ctxt *ctxt, int inc)