KVM: SVM: Let gcc to choose which registers to save (x86_64)

This patch lets GCC to determine which registers to save when we
switch to/from a VCPU in the case of AMD x86_64.

* Original code saves following registers:

    rbx, rcx, rdx, rsi, rdi, rbp,
    r8, r9, r10, r11, r12, r13, r14, r15

* Patched code:

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

    rbx, rcx, rdx, rsi, rdi
    r8, r9, r10, r11, r12, r13, r14, r15

  - 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>

1 files changed, 8 insertions, 9 deletions

diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index beb1e684b68a..debd0912a016 100644
--- a/drivers/kvm/svm.c
+++ b/drivers/kvm/svm.c
@@ -1499,10 +1499,7 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 
         asm volatile (
 #ifdef CONFIG_X86_64
-                "push %%rbx; push %%rcx; push %%rdx;"
-                "push %%rsi; push %%rdi; push %%rbp;"
-                "push %%r8;  push %%r9;  push %%r10; push %%r11;"
-                "push %%r12; push %%r13; push %%r14; push %%r15;"
+                "push %%rbp; \n\t"
 #else
                 "push %%ebx; push %%ecx; push %%edx;"
                 "push %%esi; push %%edi; push %%ebp;"
@@ -1567,10 +1564,7 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
                 "mov %%r14, %c[r14](%[svm]) \n\t"
                 "mov %%r15, %c[r15](%[svm]) \n\t"
 
-                "pop  %%r15; pop  %%r14; pop  %%r13; pop  %%r12;"
-                "pop  %%r11; pop  %%r10; pop  %%r9;  pop  %%r8;"
-                "pop  %%rbp; pop  %%rdi; pop  %%rsi;"
-                "pop  %%rdx; pop  %%rcx; pop  %%rbx; \n\t"
+                "pop  %%rbp; \n\t"
 #else
                 "mov %%ebx, %c[rbx](%[svm]) \n\t"
                 "mov %%ecx, %c[rcx](%[svm]) \n\t"
@@ -1601,7 +1595,12 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
                   [r14]"i"(offsetof(struct vcpu_svm, vcpu.regs[VCPU_REGS_R14])),
                   [r15]"i"(offsetof(struct vcpu_svm, vcpu.regs[VCPU_REGS_R15]))
 #endif
-                : "cc", "memory");
+                : "cc", "memory"
+#ifdef CONFIG_X86_64
+                , "rbx", "rcx", "rdx", "rsi", "rdi"
+                , "r8", "r9", "r10", "r11" , "r12", "r13", "r14", "r15"
+#endif
+                );
 
         if ((svm->vmcb->save.dr7 & 0xff))
                 load_db_regs(svm->host_db_regs);