irqchip/gic-v4: Substitute vmovp_lock for a per-VM lock

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vmovp_lock is abused in a number of cases to serialise updates
to vlpi_count[] and deal with map/unmap of a VM to ITSs.

Instead, provide a per-VM lock and revisit the use of vlpi_count[]
so that it is always wrapped in this per-VM vmapp_lock.

This reduces the potential contention on a concurrent VMOVP command,
and paves the way for subsequent VPE locking that holding vmovp_lock
actively prevents due to the lock ordering.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nianyao Tang <tangnianyao@huawei.com>
Link: https://lore.kernel.org/r/20240705093155.871070-3-maz@kernel.org

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Marc Zyngier 2024-07-05 10:31:54 +01:00 • committed by Thomas Gleixner

parent 7d2c2048a8

commit f0eb154c39

2 changed files with 20 additions and 15 deletions

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27

drivers/irqchip/irq-gic-v3-its.c

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8

include/linux/irqchip/arm-gic-v4.h

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