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KVM: x86: Emulate push sreg as done in Core

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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>
This commit is contained in:
Nadav Amit 2014-11-02 11:54:51 +02:00 committed by Paolo Bonzini
parent 5aca372236
commit 0fcc207c66
1 changed files with 4 additions and 0 deletions
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arch/x86/kvm/emulate.c
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@ -1817,6 +1817,10 @@ static int em_push_sreg(struct x86_emulate_ctxt *ctxt)
int seg = ctxt->src2.val;
ctxt->src.val = get_segment_selector(ctxt, seg);
if (ctxt->op_bytes == 4) {
rsp_increment(ctxt, -2);
ctxt->op_bytes = 2;
}
return em_push(ctxt);
}