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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2019-07-19 13:41:06 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2019-09-25 15:23:33 +0200 |
| commit | 4b526de50e39b38cd828396267379183c7c21354 (patch) | |
| tree | 0bd8139ce3b40338e07c1e30b4f9e85fa08f6369 /arch/x86 | |
| parent | 90a48843a18663a25aa70c6d717d38a4443e5e29 (diff) | |
| download | lwn-4b526de50e39b38cd828396267379183c7c21354.tar.gz lwn-4b526de50e39b38cd828396267379183c7c21354.zip | |
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/x86')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 2 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.c | 3 |
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); |