diff options
| author | Marc Zyngier <maz@kernel.org> | 2021-03-22 14:01:53 +0800 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2021-03-24 18:05:52 +0000 |
| commit | 301beaf19739cb6e640ed44e630e7da993f0ecc8 (patch) | |
| tree | b7c3e0c19300f9cd6d6220f7d15e6901ff7d3363 /drivers/irqchip | |
| parent | 1e28eed17697bcf343c6743f0028cc3b5dd88bf0 (diff) | |
irqchip/gic-v3-its: Add a cache invalidation right after vPE unmapping
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
Diffstat (limited to 'drivers/irqchip')
| -rw-r--r-- | drivers/irqchip/irq-gic-v3-its.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index ed46e6057e33..4eb907f65bd0 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -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 = { |