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| author | Marc Zyngier <marc.zyngier@arm.com> | 2016-02-02 19:35:34 (GMT) |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2016-03-09 04:22:20 (GMT) |
| commit | 59f00ff9afc028053fa9281407627e95008ebd5c (patch) | |
| tree | 68ae8ad7133b4707c9dd15a93b3ec263e33d1a3b /include/kvm | |
| parent | 9b4a3004439d5be680faf41f4267968ca11bb9f6 (diff) | |
| download | linux-59f00ff9afc028053fa9281407627e95008ebd5c.tar.xz | |
KVM: arm/arm64: vgic-v2: Avoid accessing GICH registers
GICv2 registers are *slow*. As in "terrifyingly slow". Which is bad.
But we're equaly bad, as we make a point in accessing them even if
we don't have any interrupt in flight.
A good solution is to first find out if we have anything useful to
write into the GIC, and if we don't, to simply not do it. This
involves tracking which LRs actually have something valid there.
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'include/kvm')
| -rw-r--r-- | include/kvm/arm_vgic.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index 13a3d53..f473fd6 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -321,6 +321,8 @@ struct vgic_cpu { /* Protected by the distributor's irq_phys_map_lock */ struct list_head irq_phys_map_list; + + u64 live_lrs; }; #define LR_EMPTY 0xff |