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[23/29] KVM: VMX: Create a stack frame in vCPU-run

Message ID 20190118212037.24412-24-sean.j.christopherson@intel.com
State New, archived
Headers show
Series KVM: VMX: Move vCPU-run to proper asm sub-routine | expand

Commit Message

Sean Christopherson Jan. 18, 2019, 9:20 p.m. UTC
...in preparation for moving to a proper assembly sub-routnine.
vCPU-run isn't a leaf function since it calls vmx_update_host_rsp()
and vmx_vmenter().  And since we need to save/restore RBP anyways,
unconditionally creating the frame costs a single MOV, i.e. don't
bother keying off CONFIG_FRAME_POINTER or using FRAME_BEGIN, etc...

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/vmx/vmx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 46ad278ae272..96f7237c8b14 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6406,8 +6406,8 @@  static void __vmx_vcpu_run(struct kvm_vcpu *vcpu, struct vcpu_vmx *vmx)
 		write_cr2(vcpu->arch.cr2);
 
 	asm(
-		/* Store host registers */
 		"push %%" _ASM_BP " \n\t"
+		"mov %%" _ASM_SP ", %%" _ASM_BP " \n\t"
 		"push %%" _ASM_ARG2 " \n\t"
 
 		/* Adjust RSP to account for the CALL to vmx_vmenter(). */