The patch titled
KVM: Clean up AMD SVM debug registers load and unload
has been removed from the -mm tree. Its filename was
kvm-clean-up-amd-svm-debug-registers-load-and-unload.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: KVM: Clean up AMD SVM debug registers load and unload
From: Avi Kivity <avi@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/kvm/svm.c | 51 ++++++--------------------------------------
1 file changed, 8 insertions(+), 43 deletions(-)
diff -puN drivers/kvm/svm.c~kvm-clean-up-amd-svm-debug-registers-load-and-unload drivers/kvm/svm.c
--- a/drivers/kvm/svm.c~kvm-clean-up-amd-svm-debug-registers-load-and-unload
+++ a/drivers/kvm/svm.c
@@ -1345,53 +1345,18 @@ static void kvm_reput_irq(struct kvm_vcp
static void save_db_regs(unsigned long *db_regs)
{
-#ifdef __x86_64__
- asm ("mov %%dr0, %%rax \n\t"
- "mov %%rax, %[dr0] \n\t"
- "mov %%dr1, %%rax \n\t"
- "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
+ asm volatile ("mov %%dr0, %0" : "=r"(db_regs[0]));
+ asm volatile ("mov %%dr1, %0" : "=r"(db_regs[1]));
+ asm volatile ("mov %%dr2, %0" : "=r"(db_regs[2]));
+ asm volatile ("mov %%dr3, %0" : "=r"(db_regs[3]));
}
static void load_db_regs(unsigned long *db_regs)
{
- asm volatile ("mov %[dr0], %%dr0 \n\t"
- "mov %[dr1], %%dr1 \n\t"
- "mov %[dr2], %%dr2 \n\t"
- "mov %[dr3], %%dr3 \n\t"
- :
- : [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
+ asm volatile ("mov %0, %%dr0" : : "r"(db_regs[0]));
+ asm volatile ("mov %0, %%dr1" : : "r"(db_regs[1]));
+ asm volatile ("mov %0, %%dr2" : : "r"(db_regs[2]));
+ asm volatile ("mov %0, %%dr3" : : "r"(db_regs[3]));
}
static int svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
_
Patches currently in -mm which might be from avi@xxxxxxxxxxxx are
kvm-add-valid_vcpu-helper.patch
kvm-amd-svm-handle-msr_star-in-32-bit-mode.patch
kvm-amd-svm-save-and-restore-the-floating-point-unit.patch
-
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