From: Sean Christopherson Date: Fri, 25 Jan 2019 15:41:11 +0000 (-0800) Subject: KVM: VMX: Create a stack frame in vCPU-run X-Git-Tag: v5.1-rc1~15^2~70 X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=63c73aa07fcabc090661a586f7ae5200a0fc5cb4;p=uclinux-h8%2Flinux.git 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 Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 12fb342218ad..52fea89732db 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -6407,8 +6407,8 @@ 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" /* * Save @regs, _ASM_ARG2 may be modified by vmx_update_host_rsp() and