diff options
| author | Christoffer Dall <christoffer.dall@linaro.org> | 2017-12-04 21:35:23 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-12-14 09:26:49 +0100 |
| commit | ec7660ccdd2b71d8c7f0243f8590253713e9b75d (patch) | |
| tree | c745134c653e1f9a1d08decdd179f4fd742dd024 /include | |
| parent | KVM: VMX: drop I/O permission bitmaps (diff) | |
| download | linux-ec7660ccdd2b71d8c7f0243f8590253713e9b75d.tar.xz linux-ec7660ccdd2b71d8c7f0243f8590253713e9b75d.zip | |
KVM: Take vcpu->mutex outside vcpu_load
As we're about to call vcpu_load() from architecture-specific
implementations of the KVM vcpu ioctls, but yet we access data
structures protected by the vcpu->mutex in the generic code, factor
this logic out from vcpu_load().
x86 is the only architecture which calls vcpu_load() outside of the main
vcpu ioctl function, and these calls will no longer take the vcpu mutex
following this patch. However, with the exception of
kvm_arch_vcpu_postcreate (see below), the callers are either in the
creation or destruction path of the VCPU, which means there cannot be
any concurrent access to the data structure, because the file descriptor
is not yet accessible, or is already gone.
kvm_arch_vcpu_postcreate makes the newly created vcpu potentially
accessible by other in-kernel threads through the kvm->vcpus array, and
we therefore take the vcpu mutex in this case directly.
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/kvm_host.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 6bdd4b9f6611..09de0ff3d677 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -533,7 +533,7 @@ static inline int kvm_vcpu_get_idx(struct kvm_vcpu *vcpu) int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id); void kvm_vcpu_uninit(struct kvm_vcpu *vcpu); -int __must_check vcpu_load(struct kvm_vcpu *vcpu); +void vcpu_load(struct kvm_vcpu *vcpu); void vcpu_put(struct kvm_vcpu *vcpu); #ifdef __KVM_HAVE_IOAPIC |