KVM: VMX: Simplify saving guest rcx in vmx_vcpu_run

Change

  push top-of-stack
  pop guest-rcx
  pop dummy

to

  pop guest-rcx

which is the same thing, only simpler.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index e2c4e32..da468c2 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -4066,7 +4066,7 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
                "xchg %0,     (%%"R"sp) \n\t"
                "mov %%"R"ax, %c[rax](%0) \n\t"
                "mov %%"R"bx, %c[rbx](%0) \n\t"
-               "push"Q" (%%"R"sp); pop"Q" %c[rcx](%0) \n\t"
+               "pop"Q" %c[rcx](%0) \n\t"
                "mov %%"R"dx, %c[rdx](%0) \n\t"
                "mov %%"R"si, %c[rsi](%0) \n\t"
                "mov %%"R"di, %c[rdi](%0) \n\t"
@@ -4084,7 +4084,7 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
                "mov %%cr2, %%"R"ax   \n\t"
                "mov %%"R"ax, %c[cr2](%0) \n\t"
 
-               "pop  %%"R"bp; pop  %%"R"bp; pop  %%"R"dx \n\t"
+               "pop  %%"R"bp; pop  %%"R"dx \n\t"
                "setbe %c[fail](%0) \n\t"
              : : "c"(vmx), "d"((unsigned long)HOST_RSP),
                [launched]"i"(offsetof(struct vcpu_vmx, launched)),