From b978c25f6ee7d4c79cbe918eed684e53887ec001 Mon Sep 17 00:00:00 2001 From: Zenghui Yu Date: Wed, 4 Mar 2020 20:33:11 +0000 Subject: [PATCH] irqchip/gic-v4.1: Wait for completion of redistributor's INVALL operation In GICv4.1, we emulate a guest-issued INVALL command by a direct write to GICR_INVALLR. Before we finish the emulation and go back to guest, let's make sure the physical invalidate operation is actually completed and no stale data will be left in redistributor. Per the specification, this can be achieved by polling the GICR_SYNCR.Busy bit (to zero). Signed-off-by: Zenghui Yu Signed-off-by: Marc Zyngier Reviewed-by: Eric Auger Link: https://lore.kernel.org/r/20200302092145.899-1-yuzenghui@huawei.com Link: https://lore.kernel.org/r/20200304203330.4967-5-maz@kernel.org --- drivers/irqchip/irq-gic-v3-its.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 1af7139..c843702 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -3827,6 +3827,8 @@ static void its_vpe_4_1_invall(struct its_vpe *vpe) /* Target the redistributor this vPE is currently known on */ rdbase = per_cpu_ptr(gic_rdists->rdist, vpe->col_idx)->rd_base; gic_write_lpir(val, rdbase + GICR_INVALLR); + + wait_for_syncr(rdbase); } static int its_vpe_4_1_set_vcpu_affinity(struct irq_data *d, void *vcpu_info) -- 2.7.4