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authorSean Christopherson <sean.j.christopherson@intel.com>2019-07-19 13:41:06 -0700
committerPaolo Bonzini <pbonzini@redhat.com>2019-09-25 15:23:33 +0200
commit4b526de50e39b38cd828396267379183c7c21354 (patch)
tree0bd8139ce3b40338e07c1e30b4f9e85fa08f6369 /arch
parent90a48843a18663a25aa70c6d717d38a4443e5e29 (diff)
downloadlinux-4b526de50e39b38cd828396267379183c7c21354.tar.gz
KVM: x86: Check kvm_rebooting in kvm_spurious_fault()
Explicitly check kvm_rebooting in kvm_spurious_fault() prior to invoking BUG(), as opposed to assuming the caller has already done so. Letting kvm_spurious_fault() be called "directly" will allow VMX to better optimize its low level assembly flows. As a happy side effect, kvm_spurious_fault() no longer needs to be marked as a dead end since it doesn't unconditionally BUG(). Acked-by: Paolo Bonzini <pbonzini@redhat.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/include/asm/kvm_host.h2
-rw-r--r--arch/x86/kvm/x86.c3
2 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index c5ed92482e2c..de0c9d8097c2 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1534,7 +1534,7 @@ enum {
#define kvm_arch_vcpu_memslots_id(vcpu) ((vcpu)->arch.hflags & HF_SMM_MASK ? 1 : 0)
#define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, (role).smm)
-asmlinkage void __noreturn kvm_spurious_fault(void);
+asmlinkage void kvm_spurious_fault(void);
/*
* Hardware virtualization extension instructions may fault if a
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c9a3d8efe1c2..0ed07d8d2caa 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -360,7 +360,8 @@ EXPORT_SYMBOL_GPL(kvm_set_apic_base);
asmlinkage __visible void kvm_spurious_fault(void)
{
/* Fault while not rebooting. We want the trace. */
- BUG();
+ if (!kvm_rebooting)
+ BUG();
}
EXPORT_SYMBOL_GPL(kvm_spurious_fault);