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| author | Radim Krčmář <rkrcmar@redhat.com> | 2017-06-04 14:43:52 +0200 |
|---|---|---|
| committer | Christoffer Dall <cdall@linaro.org> | 2017-06-04 16:53:00 +0200 |
| commit | 2fa6e1e12a024b48b2c7ea39f50205246e027da7 (patch) | |
| tree | e2c163ec4641fa294e39e5198ede51a74c927797 /arch/mips | |
| parent | 2387149eade25f32dcf1398811b3d0293181d005 (diff) | |
| download | linux-2fa6e1e12a024b48b2c7ea39f50205246e027da7.tar.bz2 | |
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 'arch/mips')
| -rw-r--r-- | arch/mips/kvm/trap_emul.c | 2 | ||||
| -rw-r--r-- | arch/mips/kvm/vz.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c index a563759fd142..6a0d7040d882 100644 --- a/arch/mips/kvm/trap_emul.c +++ b/arch/mips/kvm/trap_emul.c @@ -1094,7 +1094,7 @@ static void kvm_trap_emul_check_requests(struct kvm_vcpu *vcpu, int cpu, struct mm_struct *mm; int i; - if (likely(!vcpu->requests)) + if (likely(!kvm_request_pending(vcpu))) return; if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) { diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c index 71d8856ade64..74805035edc8 100644 --- a/arch/mips/kvm/vz.c +++ b/arch/mips/kvm/vz.c @@ -2337,7 +2337,7 @@ static int kvm_vz_check_requests(struct kvm_vcpu *vcpu, int cpu) int ret = 0; int i; - if (!vcpu->requests) + if (!kvm_request_pending(vcpu)) return 0; if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) { |