linux-kernel - [PATCH -next] kvm/svm: disable KCSAN for svm_vcpu

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Date:   Wed, 15 Apr 2020 11:37:09 -0400
From:   Qian Cai <cai@....pw>
To:     paulmck@...nel.org, pbonzini@...hat.com
Cc:     elver@...gle.com, sean.j.christopherson@...el.com,
        kasan-dev@...glegroups.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Qian Cai <cai@....pw>
Subject: [PATCH -next] kvm/svm: disable KCSAN for svm_vcpu_run()

For some reasons, running a simple qemu-kvm command with KCSAN will
reset AMD hosts. It turns out svm_vcpu_run() could not be instrumented.
Disable it for now.

 # /usr/libexec/qemu-kvm -name ubuntu-18.04-server-cloudimg -cpu host
	-smp 2 -m 2G -hda ubuntu-18.04-server-cloudimg.qcow2

=== console output ===
Kernel 5.6.0-next-20200408+ on an x86_64

hp-dl385g10-05 login:

<...host reset...>

HPE ProLiant System BIOS A40 v1.20 (03/09/2018)
(C) Copyright 1982-2018 Hewlett Packard Enterprise Development LP
Early system initialization, please wait...

Signed-off-by: Qian Cai <cai@....pw>
---
 arch/x86/kvm/svm/svm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 2be5bbae3a40..1fdb300e9337 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3278,7 +3278,7 @@ static void svm_cancel_injection(struct kvm_vcpu *vcpu)
 
 bool __svm_vcpu_run(unsigned long vmcb_pa, unsigned long *regs);
 
-static void svm_vcpu_run(struct kvm_vcpu *vcpu)
+static __no_kcsan void svm_vcpu_run(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
 
-- 
2.21.0 (Apple Git-122.2)