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| author | Marc Zyngier <maz@kernel.org> | 2019-10-27 17:41:59 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2019-10-28 19:20:58 +0300 |
| commit | 8e01d9a396e6db153d94a6004e6473d9ff251a6a (patch) | |
| tree | a7b0bba9a91ac8544ee28ba101864f5a8486e87e /drivers/irqchip | |
| parent | 5c401308017f256ae9de804b4a1c65be1d390571 (diff) | |
| download | linux-8e01d9a396e6db153d94a6004e6473d9ff251a6a.tar.xz | |
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 'drivers/irqchip')
| -rw-r--r-- | drivers/irqchip/irq-gic-v4.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/irqchip/irq-gic-v4.c b/drivers/irqchip/irq-gic-v4.c index 563e87ed0766..45969927cc81 100644 --- a/drivers/irqchip/irq-gic-v4.c +++ b/drivers/irqchip/irq-gic-v4.c @@ -141,12 +141,17 @@ static int its_send_vpe_cmd(struct its_vpe *vpe, struct its_cmd_info *info) int its_schedule_vpe(struct its_vpe *vpe, bool on) { struct its_cmd_info info; + int ret; WARN_ON(preemptible()); info.cmd_type = on ? SCHEDULE_VPE : DESCHEDULE_VPE; - return its_send_vpe_cmd(vpe, &info); + ret = its_send_vpe_cmd(vpe, &info); + if (!ret) + vpe->resident = on; + + return ret; } int its_invall_vpe(struct its_vpe *vpe) |