linux-kernel - [PATCH 03/22] x86/kvm: Fix frame pointer usage in vmx

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Date:   Sun, 14 Jul 2019 19:36:58 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Arnd Bergmann <arnd@...db.de>, Jann Horn <jannh@...gle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Subject: [PATCH 03/22] x86/kvm: Fix frame pointer usage in vmx_vmenter()

With CONFIG_FRAME_POINTER, vmx_vmenter() needs to do frame pointer setup
before calling kvm_spurious_fault().

Fixes the following warning:

  arch/x86/kvm/vmx/vmenter.o: warning: objtool: vmx_vmenter()+0x14: call without frame pointer save/setup

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Radim Krčmář <rkrcmar@...hat.com>
---
 arch/x86/kvm/vmx/vmenter.S | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmenter.S b/arch/x86/kvm/vmx/vmenter.S
index d4cb1945b2e3..a2fabe3aaf9c 100644
--- a/arch/x86/kvm/vmx/vmenter.S
+++ b/arch/x86/kvm/vmx/vmenter.S
@@ -4,6 +4,7 @@
 #include <asm/bitsperlong.h>
 #include <asm/kvm_vcpu_regs.h>
 #include <asm/nospec-branch.h>
+#include <asm/frame.h>
 
 #define WORD_SIZE (BITS_PER_LONG / 8)
 
@@ -44,19 +45,22 @@
  * to vmx_vmexit.
  */
 ENTRY(vmx_vmenter)
+	FRAME_BEGIN
 	/* EFLAGS.ZF is set if VMCS.LAUNCHED == 0 */
 	je 2f
 
 1:	vmresume
-	ret
+	jmp 4f
 
 2:	vmlaunch
-	ret
+	jmp 4f
 
 3:	cmpb $0, kvm_rebooting
 	jne 4f
 	call kvm_spurious_fault
-4:	ret
+
+4:	FRAME_END
+	ret
 
 	.pushsection .fixup, "ax"
 5:	jmp 3b
-- 
2.20.1