KVM: SVM: Let gcc to choose which registers to save (i386)
authorLaurent Vivier <Laurent.Vivier@bull.net>
Thu, 25 Oct 2007 12:18:54 +0000 (14:18 +0200)
committerAvi Kivity <avi@qumranet.com>
Wed, 30 Jan 2008 15:52:57 +0000 (17:52 +0200)
commitfe7935d49fbe33308c1b5f0e35137989da851010
tree9adf908a42aafda09e1d100072bcb332611c8b85
parent54a08c0449683f763dc69e653d17e8c120e16299
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>
drivers/kvm/svm.c