linux-kernel - [PATCH 8/8] KVM: x86: Stop compiling vmenter.S with OBJECT_FILES_NON

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Date: Fri, 23 Feb 2024 12:42:33 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Tom Lendacky <thomas.lendacky@....com>, Michael Roth <michael.roth@....com>, 
	Alexey Kardashevskiy <aik@....com>
Subject: [PATCH 8/8] KVM: x86: Stop compiling vmenter.S with OBJECT_FILES_NON_STANDARD

Stop compiling vmenter.S with OBJECT_FILES_NON_STANDARD to skip objtool's
stack validation now that __svm_vcpu_run() and __svm_sev_es_vcpu_run()
create stack frames (thoughthe former's effectiveness is dubious).

Note, due to a quirk in how OBJECT_FILES_NON_STANDARD is handled by the
build system, this also affects vmx/vmenter.S.  But __vmx_vcpu_run()
already plays nice with frame pointers, i.e. it was collateral damage when
commit 7f4b5cde2409 ("kvm: Disable objtool frame pointer checking for
vmenter.S") added the OBJECT_FILES_NON_STANDARD hack-a-fix.

Link: https://lore.kernel.org/all/20240217055504.2059803-1-masahiroy@kernel.org
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/Makefile | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index 475b5fa917a6..addc44fc7187 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -3,10 +3,6 @@
 ccflags-y += -I $(srctree)/arch/x86/kvm
 ccflags-$(CONFIG_KVM_WERROR) += -Werror

-ifeq ($(CONFIG_FRAME_POINTER),y)
-OBJECT_FILES_NON_STANDARD_vmenter.o := y
-endif
-
 include $(srctree)/virt/kvm/Makefile.kvm

 kvm-y			+= x86.o emulate.o i8259.o irq.o lapic.o \
-- 
2.44.0.rc0.258.g7320e95886-goog