From: Nadav Amit <namit@cs.technion.ac.il>
Date: Mon, 26 Jan 2015 07:32:22 +0000 (+0200)
Subject: KVM: x86: Wrong operand size for far ret
X-Git-Tag: fixes-v4.0-rc1~113^2~34
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=16794aaaab66fa74ab19588a8e255a460e8b3ace;p=pandora-kernel.git

KVM: x86: Wrong operand size for far ret

Indeed, Intel SDM specifically states that for the RET instruction "In 64-bit
mode, the default operation size of this instruction is the stack-address size,
i.e. 64 bits."

However, experiments show this is not the case. Here is for example objdump of
small 64-bit asm:

  4004f1:	ca 14 00             	lret   $0x14
  4004f4:	48 cb                	lretq
  4004f6:	48 ca 14 00          	lretq  $0x14

Therefore, remove the Stack flag from far-ret instructions.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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