linux-kernel - [RFC v4 14/18] arm64: kvm: Annotate non-standard stack frame functions

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Date:   Fri, 16 Aug 2019 13:23:59 +0100
From:   Raphael Gault <raphael.gault@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        jpoimboe@...hat.com
Cc:     peterz@...radead.org, catalin.marinas@....com, will.deacon@....com,
        julien.thierry.kdev@...il.com, raph.gault+kdev@...il.com,
        Raphael Gault <raphael.gault@....com>
Subject: [RFC v4 14/18] arm64: kvm: Annotate non-standard stack frame functions

Both __guest_entry and __guest_exit functions do not setup
a correct stack frame. Because they can be considered as callable
functions, even if they are particular cases, we chose to silence
the warnings given by objtool by annotating them as non-standard.

Signed-off-by: Raphael Gault <raphael.gault@....com>
---
 arch/arm64/kvm/hyp/entry.S | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/kvm/hyp/entry.S b/arch/arm64/kvm/hyp/entry.S
index e5cc8d66bf53..c3443bfd0944 100644
--- a/arch/arm64/kvm/hyp/entry.S
+++ b/arch/arm64/kvm/hyp/entry.S
@@ -15,6 +15,7 @@
 #include <asm/kvm_asm.h>
 #include <asm/kvm_mmu.h>
 #include <asm/kvm_ptrauth.h>
+#include <linux/frame.h>
 
 #define CPU_GP_REG_OFFSET(x)	(CPU_GP_REGS + x)
 #define CPU_XREG_OFFSET(x)	CPU_GP_REG_OFFSET(CPU_USER_PT_REGS + 8*x)
@@ -97,6 +98,7 @@ alternative_else_nop_endif
 	eret
 	sb
 ENDPROC(__guest_enter)
+asm_stack_frame_non_standard __guest_enter
 
 ENTRY(__guest_exit)
 	// x0: return code
@@ -193,3 +195,4 @@ abort_guest_exit_end:
 	orr	x0, x0, x5
 1:	ret
 ENDPROC(__guest_exit)
+asm_stack_frame_non_standard __guest_exit
-- 
2.17.1