Commit 301beaf1 authored by Marc Zyngier's avatar Marc Zyngier
Browse files

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: default avatarMarc Zyngier <maz@kernel.org>
Signed-off-by: default avatarShenming Lu <lushenming@huawei.com>
Link: https://lore.kernel.org/r/20210322060158.1584-2-lushenming@huawei.com
parent 1e28eed1

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

+9 −0
Original line number Diff line number Diff line
@@ -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 = {