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irqchip/gic-v3-its: Add a cache invalidation right after vPE unmapping

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In order to be able to manipulate the VPT once a vPE has been
unmapped, perform the required CMO to invalidate the CPU view
of the VPT.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Shenming Lu <lushenming@huawei.com>
Link: https://lore.kernel.org/r/20210322060158.1584-2-lushenming@huawei.com
This commit is contained in:
Marc Zyngier 2021-03-22 14:01:53 +08:00
parent 1e28eed176
commit 301beaf197
1 changed files with 9 additions and 0 deletions
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9
drivers/irqchip/irq-gic-v3-its.c
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@ -4554,6 +4554,15 @@ static void its_vpe_irq_domain_deactivate(struct irq_domain *domain,
its_send_vmapp(its, vpe, false);
}
/*
* There may be a direct read to the VPT after unmapping the
* vPE, to guarantee the validity of this, we make the VPT
* memory coherent with the CPU caches here.
*/
if (find_4_1_its() && !atomic_read(&vpe->vmapp_count))
gic_flush_dcache_to_poc(page_address(vpe->vpt_page),
LPI_PENDBASE_SZ);
}
static const struct irq_domain_ops its_vpe_domain_ops = {