From: Laurent Vivier <Laurent.Vivier@bull.net>
Date: Thu, 25 Oct 2007 12:18:54 +0000 (+0200)
Subject: KVM: SVM: Let gcc to choose which registers to save (i386)
X-Git-Tag: v2.6.25-rc1~1138^2~185
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fe7935d49fbe33308c1b5f0e35137989da851010;p=pandora-kernel.git

KVM: SVM: Let gcc to choose which registers to save (i386)

This patch lets GCC to determine which registers to save when we
switch to/from a VCPU in the case of AMD i386

* Original code saves following registers:

    ebx, ecx, edx, esi, edi, ebp

* Patched code:

  - informs GCC that we modify following registers
    using the clobber description:

    ebx, ecx, edx, esi, edi

  - rbp is saved (pop/push) because GCC seems to ignore its use in the clobber
    description.

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
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