diff options
| author | Radim Krčmář <rkrcmar@redhat.com> | 2017-06-04 15:43:52 +0300 |
|---|---|---|
| committer | Christoffer Dall <cdall@linaro.org> | 2017-06-04 17:53:00 +0300 |
| commit | 2fa6e1e12a024b48b2c7ea39f50205246e027da7 (patch) | |
| tree | e2c163ec4641fa294e39e5198ede51a74c927797 /include/linux/kvm_host.h | |
| parent | 2387149eade25f32dcf1398811b3d0293181d005 (diff) | |
| download | linux-2fa6e1e12a024b48b2c7ea39f50205246e027da7.tar.xz | |
KVM: add kvm_request_pending
A first step in vcpu->requests encapsulation. Additionally, we now
use READ_ONCE() when accessing vcpu->requests, which ensures we
always load vcpu->requests when it's accessed. This is important as
other threads can change it any time. Also, READ_ONCE() documents
that vcpu->requests is used with other threads, likely requiring
memory barriers, which it does.
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
[ Documented the new use of READ_ONCE() and converted another check
in arch/mips/kvm/vz.c ]
Signed-off-by: Andrew Jones <drjones@redhat.com>
Acked-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
Diffstat (limited to 'include/linux/kvm_host.h')
| -rw-r--r-- | include/linux/kvm_host.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 3724b51aab64..0b50e7b35ed4 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1105,6 +1105,11 @@ static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu) set_bit(req & KVM_REQUEST_MASK, &vcpu->requests); } +static inline bool kvm_request_pending(struct kvm_vcpu *vcpu) +{ + return READ_ONCE(vcpu->requests); +} + static inline bool kvm_test_request(int req, struct kvm_vcpu *vcpu) { return test_bit(req & KVM_REQUEST_MASK, &vcpu->requests); |