From 0fcc207c66a7cff024b05367b86d70d742072d61 Mon Sep 17 00:00:00 2001 From: Nadav Amit Date: Sun, 2 Nov 2014 11:54:51 +0200 Subject: [PATCH] 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 Signed-off-by: Paolo Bonzini --- arch/x86/kvm/emulate.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 7aba1db168c9..a2a9c18b42e4 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -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); } -- 2.20.1