diff options
| author | David Hildenbrand <david@redhat.com> | 2017-04-28 17:06:20 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-05-02 14:45:45 +0200 |
| commit | 5c0aea0e8d98e38858fbb3a09870ed8487a01da2 (patch) | |
| tree | 12549a0a41cdda2b265bf0107daca828bc52b8c5 /arch/x86/include/asm | |
| parent | bcb85c887647c0f096b51ac2ee391ea792b14b9e (diff) | |
KVM: x86: don't hold kvm->lock in KVM_SET_GSI_ROUTING
We needed the lock to avoid racing with creation of the irqchip on x86. As
kvm_set_irq_routing() calls srcu_synchronize_expedited(), this lock
might be held for a longer time.
Let's introduce an arch specific callback to check if we can actually
add irq routes. For x86, all we have to do is check if we have an
irqchip in the kernel. We don't need kvm->lock at that point as the
irqchip is marked as inititalized only when actually fully created.
Reported-by: Steve Rutherford <srutherford@google.com>
Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>
Fixes: 1df6ddede10a ("KVM: x86: race between KVM_SET_GSI_ROUTING and KVM_CREATE_IRQCHIP")
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 84c8489531bb..f5bddf92faba 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -728,7 +728,6 @@ struct kvm_hv { enum kvm_irqchip_mode { KVM_IRQCHIP_NONE, - KVM_IRQCHIP_INIT_IN_PROGRESS, /* temporarily set during creation */ KVM_IRQCHIP_KERNEL, /* created with KVM_CREATE_IRQCHIP */ KVM_IRQCHIP_SPLIT, /* created with KVM_CAP_SPLIT_IRQCHIP */ }; |