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KVM: x86: Emulate push sreg as done in Core
According to Intel SDM push of segment selectors is done in the following manner: "if the operand size is 32-bits, either a zero-extended value is pushed on the stack or the segment selector is written on the stack using a 16-bit move. For the last case, all recent Core and Atom processors perform a 16-bit move, leaving the upper portion of the stack location unmodified." This patch modifies the behavior to match the core behavior. Signed-off-by: Nadav Amit <namit@cs.technion.ac.il> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -1817,6 +1817,10 @@ static int em_push_sreg(struct x86_emulate_ctxt *ctxt)
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int seg = ctxt->src2.val;
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ctxt->src.val = get_segment_selector(ctxt, seg);
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if (ctxt->op_bytes == 4) {
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rsp_increment(ctxt, -2);
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ctxt->op_bytes = 2;
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}
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return em_push(ctxt);
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}
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