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Subject[PATCH 18/40] KVM: SVM: Unify register save/restore across 32 and 64 bit hosts
Date
From: Avi Kivity <avi@qumranet.com>

Signed-off-by: Avi Kivity <avi@qumranet.com>
---
arch/x86/kvm/svm.c | 78 +++++++++++++++++----------------------------------
1 files changed, 26 insertions(+), 52 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 743c98d..179c2e0 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1697,6 +1697,12 @@ static inline void sync_lapic_to_cr8(struct kvm_vcpu *vcpu)
svm->vmcb->control.int_ctl |= cr8 & V_TPR_MASK;
}

+#ifdef CONFIG_X86_64
+#define R "r"
+#else
+#define R "e"
+#endif
+
static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
struct vcpu_svm *svm = to_svm(vcpu);
@@ -1735,19 +1741,14 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
local_irq_enable();

asm volatile (
+ "push %%"R"bp; \n\t"
+ "mov %c[rbx](%[svm]), %%"R"bx \n\t"
+ "mov %c[rcx](%[svm]), %%"R"cx \n\t"
+ "mov %c[rdx](%[svm]), %%"R"dx \n\t"
+ "mov %c[rsi](%[svm]), %%"R"si \n\t"
+ "mov %c[rdi](%[svm]), %%"R"di \n\t"
+ "mov %c[rbp](%[svm]), %%"R"bp \n\t"
#ifdef CONFIG_X86_64
- "push %%rbp; \n\t"
-#else
- "push %%ebp; \n\t"
-#endif
-
-#ifdef CONFIG_X86_64
- "mov %c[rbx](%[svm]), %%rbx \n\t"
- "mov %c[rcx](%[svm]), %%rcx \n\t"
- "mov %c[rdx](%[svm]), %%rdx \n\t"
- "mov %c[rsi](%[svm]), %%rsi \n\t"
- "mov %c[rdi](%[svm]), %%rdi \n\t"
- "mov %c[rbp](%[svm]), %%rbp \n\t"
"mov %c[r8](%[svm]), %%r8 \n\t"
"mov %c[r9](%[svm]), %%r9 \n\t"
"mov %c[r10](%[svm]), %%r10 \n\t"
@@ -1756,41 +1757,24 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
"mov %c[r13](%[svm]), %%r13 \n\t"
"mov %c[r14](%[svm]), %%r14 \n\t"
"mov %c[r15](%[svm]), %%r15 \n\t"
-#else
- "mov %c[rbx](%[svm]), %%ebx \n\t"
- "mov %c[rcx](%[svm]), %%ecx \n\t"
- "mov %c[rdx](%[svm]), %%edx \n\t"
- "mov %c[rsi](%[svm]), %%esi \n\t"
- "mov %c[rdi](%[svm]), %%edi \n\t"
- "mov %c[rbp](%[svm]), %%ebp \n\t"
#endif

-#ifdef CONFIG_X86_64
/* Enter guest mode */
- "push %%rax \n\t"
- "mov %c[vmcb](%[svm]), %%rax \n\t"
+ "push %%"R"ax \n\t"
+ "mov %c[vmcb](%[svm]), %%"R"ax \n\t"
__ex(SVM_VMLOAD) "\n\t"
__ex(SVM_VMRUN) "\n\t"
__ex(SVM_VMSAVE) "\n\t"
- "pop %%rax \n\t"
-#else
- /* Enter guest mode */
- "push %%eax \n\t"
- "mov %c[vmcb](%[svm]), %%eax \n\t"
- __ex(SVM_VMLOAD) "\n\t"
- __ex(SVM_VMRUN) "\n\t"
- __ex(SVM_VMSAVE) "\n\t"
- "pop %%eax \n\t"
-#endif
+ "pop %%"R"ax \n\t"

/* Save guest registers, load host registers */
+ "mov %%"R"bx, %c[rbx](%[svm]) \n\t"
+ "mov %%"R"cx, %c[rcx](%[svm]) \n\t"
+ "mov %%"R"dx, %c[rdx](%[svm]) \n\t"
+ "mov %%"R"si, %c[rsi](%[svm]) \n\t"
+ "mov %%"R"di, %c[rdi](%[svm]) \n\t"
+ "mov %%"R"bp, %c[rbp](%[svm]) \n\t"
#ifdef CONFIG_X86_64
- "mov %%rbx, %c[rbx](%[svm]) \n\t"
- "mov %%rcx, %c[rcx](%[svm]) \n\t"
- "mov %%rdx, %c[rdx](%[svm]) \n\t"
- "mov %%rsi, %c[rsi](%[svm]) \n\t"
- "mov %%rdi, %c[rdi](%[svm]) \n\t"
- "mov %%rbp, %c[rbp](%[svm]) \n\t"
"mov %%r8, %c[r8](%[svm]) \n\t"
"mov %%r9, %c[r9](%[svm]) \n\t"
"mov %%r10, %c[r10](%[svm]) \n\t"
@@ -1799,18 +1783,8 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
"mov %%r13, %c[r13](%[svm]) \n\t"
"mov %%r14, %c[r14](%[svm]) \n\t"
"mov %%r15, %c[r15](%[svm]) \n\t"
-
- "pop %%rbp; \n\t"
-#else
- "mov %%ebx, %c[rbx](%[svm]) \n\t"
- "mov %%ecx, %c[rcx](%[svm]) \n\t"
- "mov %%edx, %c[rdx](%[svm]) \n\t"
- "mov %%esi, %c[rsi](%[svm]) \n\t"
- "mov %%edi, %c[rdi](%[svm]) \n\t"
- "mov %%ebp, %c[rbp](%[svm]) \n\t"
-
- "pop %%ebp; \n\t"
#endif
+ "pop %%"R"bp"
:
: [svm]"a"(svm),
[vmcb]"i"(offsetof(struct vcpu_svm, vmcb_pa)),
@@ -1831,11 +1805,9 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
[r15]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R15]))
#endif
: "cc", "memory"
+ , R"bx", R"cx", R"dx", R"si", R"di"
#ifdef CONFIG_X86_64
- , "rbx", "rcx", "rdx", "rsi", "rdi"
, "r8", "r9", "r10", "r11" , "r12", "r13", "r14", "r15"
-#else
- , "ebx", "ecx", "edx" , "esi", "edi"
#endif
);

@@ -1867,6 +1839,8 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
svm->next_rip = 0;
}

+#undef R
+
static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root)
{
struct vcpu_svm *svm = to_svm(vcpu);
--
1.6.0.1


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