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KVM: VMX: Create a stack frame in vCPU-run 

...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>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2019-01-25 07:41:11 -08:00 committed by Paolo Bonzini
parent c14f9dd50b
commit 63c73aa07f
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/vmx/vmx.c
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@ -6407,8 +6407,8 @@ static void __vmx_vcpu_run(struct kvm_vcpu *vcpu, struct vcpu_vmx *vmx)
write_cr2(vcpu->arch.cr2); write_cr2(vcpu->arch.cr2);
asm( asm(
/* Store host registers */
"push %%" _ASM_BP " \n\t" "push %%" _ASM_BP " \n\t"
"mov %%" _ASM_SP ", %%" _ASM_BP " \n\t"
/* /*
* Save @regs, _ASM_ARG2 may be modified by vmx_update_host_rsp() and * Save @regs, _ASM_ARG2 may be modified by vmx_update_host_rsp() and