linux-kernel - [PATCH] kvm: always inline vmx_vcpu

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Message-Id: <20190115154014.73919-1-cai@lca.pw>
Date:   Tue, 15 Jan 2019 10:40:14 -0500
From:   Qian Cai <cai@....pw>
To:     pbonzini@...hat.com, rkrcmar@...hat.com
Cc:     sean.j.christopherson@...el.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com, x86@...nel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Qian Cai <cai@....pw>
Subject: [PATCH] kvm: always inline vmx_vcpu_run()

__noclone was removed from vmx_vcpu_run() in 453eafbe65f which causes a
compilation warning using GCC 8,

arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_vcpu_run.part.17()+0x3171:
call without frame pointer save/setup

GCC decides to splits the function into small parts for optimization
which confuses STACK_FRAME_NON_STANDARD(vmx_vcpu_run). Hence, just
inline the whole function to avoid this.

Fixes: 453eafbe65f (KVM: VMX: Move VM-Enter + VM-Exit handling to
non-inline sub-routines)
Signed-off-by: Qian Cai <cai@....pw>
---
 arch/x86/kvm/vmx/vmx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index f6915f10e584..d38b275bdcc3 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6362,7 +6362,7 @@ static void vmx_update_hv_timer(struct kvm_vcpu *vcpu)
 	vmx->loaded_vmcs->hv_timer_armed = false;
 }
 
-static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
+static __always_inline void vmx_vcpu_run(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
 	unsigned long cr3, cr4, evmcs_rsp;
-- 
2.17.2 (Apple Git-113)