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| author | Marc Zyngier <maz@kernel.org> | 2019-10-27 14:41:59 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2019-10-28 16:20:58 +0000 |
| commit | 8e01d9a396e6db153d94a6004e6473d9ff251a6a (patch) | |
| tree | a7b0bba9a91ac8544ee28ba101864f5a8486e87e /include/kvm | |
| parent | 5c401308017f256ae9de804b4a1c65be1d390571 (diff) | |
| download | lwn-8e01d9a396e6db153d94a6004e6473d9ff251a6a.tar.gz lwn-8e01d9a396e6db153d94a6004e6473d9ff251a6a.zip | |
KVM: arm64: vgic-v4: Move the GICv4 residency flow to be driven by vcpu_load/put
When the VHE code was reworked, a lot of the vgic stuff was moved around,
but the GICv4 residency code did stay untouched, meaning that we come
in and out of residency on each flush/sync, which is obviously suboptimal.
To address this, let's move things around a bit:
- Residency entry (flush) moves to vcpu_load
- Residency exit (sync) moves to vcpu_put
- On blocking (entry to WFI), we "put"
- On unblocking (exit from WFI), we "load"
Because these can nest (load/block/put/load/unblock/put, for example),
we now have per-VPE tracking of the residency state.
Additionally, vgic_v4_put gains a "need doorbell" parameter, which only
gets set to true when blocking because of a WFI. This allows a finer
control of the doorbell, which now also gets disabled as soon as
it gets signaled.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20191027144234.8395-2-maz@kernel.org
Diffstat (limited to 'include/kvm')
| -rw-r--r-- | include/kvm/arm_vgic.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index af4f09c02bf1..4dc58d7a0010 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -396,7 +396,7 @@ int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int irq, int kvm_vgic_v4_unset_forwarding(struct kvm *kvm, int irq, struct kvm_kernel_irq_routing_entry *irq_entry); -void kvm_vgic_v4_enable_doorbell(struct kvm_vcpu *vcpu); -void kvm_vgic_v4_disable_doorbell(struct kvm_vcpu *vcpu); +int vgic_v4_load(struct kvm_vcpu *vcpu); +int vgic_v4_put(struct kvm_vcpu *vcpu, bool need_db); #endif /* __KVM_ARM_VGIC_H */ |