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>
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3db176d5b4
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ee122a7109
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@ -524,13 +524,9 @@ static void masked_increment(ulong *reg, ulong mask, int inc)
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static inline void
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register_address_increment(struct x86_emulate_ctxt *ctxt, int reg, int inc)
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{
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ulong mask;
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ulong *preg = reg_rmw(ctxt, reg);
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if (ctxt->ad_bytes == sizeof(unsigned long))
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mask = ~0UL;
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else
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mask = ad_mask(ctxt);
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masked_increment(reg_rmw(ctxt, reg), mask, inc);
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assign_register(preg, *preg + inc, ctxt->ad_bytes);
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}
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static void rsp_increment(struct x86_emulate_ctxt *ctxt, int inc)
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