From: Nadav Amit <namit@cs.technion.ac.il>
Date: Sun, 2 Nov 2014 09:54:46 +0000 (+0200)
Subject: KVM: x86: Emulation of MOV-sreg to memory uses incorrect size
X-Git-Tag: omap-for-v3.19/fixes-rc1~43^2~83
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b5bbf10ee6b65b70c10c139822bc2dc077cefa76;p=pandora-kernel.git

KVM: x86: Emulation of MOV-sreg to memory uses incorrect size

In x86, you can only MOV-sreg to memory with either 16-bits or 64-bits size.
In contrast, KVM may write to 32-bits memory on MOV-sreg. This patch fixes KVM
behavior, and sets the destination operand size to two, if the destination is
memory.

When destination is registers, and the operand size is 32-bits, the high
16-bits in modern CPUs is filled with zero.  This is handled correctly.

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