Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=fe7935d49fbe33308c1b5f0e35137989da851010
Commit:     fe7935d49fbe33308c1b5f0e35137989da851010
Parent:     54a08c0449683f763dc69e653d17e8c120e16299
Author:     Laurent Vivier <[EMAIL PROTECTED]>
AuthorDate: Thu Oct 25 14:18:54 2007 +0200
Committer:  Avi Kivity <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 17:52:57 2008 +0200

    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 <[EMAIL PROTECTED]>
    Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
---
 drivers/kvm/svm.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index debd091..fe2a5e8 100644
--- a/drivers/kvm/svm.c
+++ b/drivers/kvm/svm.c
@@ -1501,8 +1501,7 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct 
kvm_run *kvm_run)
 #ifdef CONFIG_X86_64
                "push %%rbp; \n\t"
 #else
-               "push %%ebx; push %%ecx; push %%edx;"
-               "push %%esi; push %%edi; push %%ebp;"
+               "push %%ebp; \n\t"
 #endif
 
 #ifdef CONFIG_X86_64
@@ -1573,8 +1572,7 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct 
kvm_run *kvm_run)
                "mov %%edi, %c[rdi](%[svm]) \n\t"
                "mov %%ebp, %c[rbp](%[svm]) \n\t"
 
-               "pop  %%ebp; pop  %%edi; pop  %%esi;"
-               "pop  %%edx; pop  %%ecx; pop  %%ebx; \n\t"
+               "pop  %%ebp; \n\t"
 #endif
                :
                : [svm]"a"(svm),
@@ -1599,6 +1597,8 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct 
kvm_run *kvm_run)
 #ifdef CONFIG_X86_64
                , "rbx", "rcx", "rdx", "rsi", "rdi"
                , "r8", "r9", "r10", "r11" , "r12", "r13", "r14", "r15"
+#else
+               , "ebx", "ecx", "edx" , "esi", "edi"
 #endif
                );
 
-
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