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[PATCH] KVM: Clean up AMD SVM debug registers load and unload

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By letting gcc choose the temporary register for us, we lose arch dependency
and some ugliness.  Conceivably gcc will also generate marginally better code.

Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Avi Kivity 2006-12-13 00:33:45 -08:00 committed by Linus Torvalds
parent fd24dc4af6
commit 5aff458e9c
1 changed files with 8 additions and 43 deletions
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51
drivers/kvm/svm.c
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@ -1345,53 +1345,18 @@ static void kvm_reput_irq(struct kvm_vcpu *vcpu)
static void save_db_regs(unsigned long *db_regs) static void save_db_regs(unsigned long *db_regs)
{ {
#ifdef __x86_64__ asm volatile ("mov %%dr0, %0" : "=r"(db_regs[0]));
asm ("mov %%dr0, %%rax \n\t" asm volatile ("mov %%dr1, %0" : "=r"(db_regs[1]));
"mov %%rax, %[dr0] \n\t" asm volatile ("mov %%dr2, %0" : "=r"(db_regs[2]));
"mov %%dr1, %%rax \n\t" asm volatile ("mov %%dr3, %0" : "=r"(db_regs[3]));
"mov %%rax, %[dr1] \n\t"
"mov %%dr2, %%rax \n\t"
"mov %%rax, %[dr2] \n\t"
"mov %%dr3, %%rax \n\t"
"mov %%rax, %[dr3] \n\t"
: [dr0] "=m"(db_regs[0]),
[dr1] "=m"(db_regs[1]),
[dr2] "=m"(db_regs[2]),
[dr3] "=m"(db_regs[3])
: : "rax");
#else
asm ("mov %%dr0, %%eax \n\t"
"mov %%eax, %[dr0] \n\t"
"mov %%dr1, %%eax \n\t"
"mov %%eax, %[dr1] \n\t"
"mov %%dr2, %%eax \n\t"
"mov %%eax, %[dr2] \n\t"
"mov %%dr3, %%eax \n\t"
"mov %%eax, %[dr3] \n\t"
: [dr0] "=m"(db_regs[0]),
[dr1] "=m"(db_regs[1]),
[dr2] "=m"(db_regs[2]),
[dr3] "=m"(db_regs[3])
: : "eax");
#endif
} }
static void load_db_regs(unsigned long *db_regs) static void load_db_regs(unsigned long *db_regs)
{ {
asm volatile ("mov %[dr0], %%dr0 \n\t" asm volatile ("mov %0, %%dr0" : : "r"(db_regs[0]));
"mov %[dr1], %%dr1 \n\t" asm volatile ("mov %0, %%dr1" : : "r"(db_regs[1]));
"mov %[dr2], %%dr2 \n\t" asm volatile ("mov %0, %%dr2" : : "r"(db_regs[2]));
"mov %[dr3], %%dr3 \n\t" asm volatile ("mov %0, %%dr3" : : "r"(db_regs[3]));
:
: [dr0] "r"(db_regs[0]),
[dr1] "r"(db_regs[1]),
[dr2] "r"(db_regs[2]),
[dr3] "r"(db_regs[3])
#ifdef __x86_64__
: "rax");
#else
: "eax");
#endif
} }
static int svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) static int svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)