From e5ff041f62fd01154dc91f9ac43ac3498b4689e1 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Sat, 22 Jan 2022 18:24:33 +0000 Subject: hw/intc/arm_gicv3: Initialise dma_as in GIC, not ITS In our implementation, all ITSes connected to a GIC share a single AddressSpace, which we keep in the GICv3State::dma_as field and initialized based on the GIC's 'sysmem' property. The right place to set it up by calling address_space_init() is therefore in the GIC's realize method, not the ITS's realize. This fixes a theoretical bug where QEMU hangs on startup if the board model creates two ITSes connected to the same GIC -- we would call address_space_init() twice on the same AddressSpace*, which creates an infinite loop in the QTAILQ that softmmu/memory.c uses to store its list of AddressSpaces and causes any subsequent attempt to iterate through that list to loop forever. There aren't any board models like that in the tree at the moment, though. Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson Message-id: 20220122182444.724087-4-peter.maydell@linaro.org --- hw/intc/arm_gicv3_common.c | 5 +++++ hw/intc/arm_gicv3_its.c | 3 --- 2 files changed, 5 insertions(+), 3 deletions(-) (limited to 'hw') diff --git a/hw/intc/arm_gicv3_common.c b/hw/intc/arm_gicv3_common.c index 9884d2e..579aa0c 100644 --- a/hw/intc/arm_gicv3_common.c +++ b/hw/intc/arm_gicv3_common.c @@ -357,6 +357,11 @@ static void arm_gicv3_common_realize(DeviceState *dev, Error **errp) return; } + if (s->lpi_enable) { + address_space_init(&s->dma_as, s->dma, + "gicv3-its-sysmem"); + } + s->cpu = g_new0(GICv3CPUState, s->num_cpu); for (i = 0; i < s->num_cpu; i++) { diff --git a/hw/intc/arm_gicv3_its.c b/hw/intc/arm_gicv3_its.c index 6d2549e..67f12d9 100644 --- a/hw/intc/arm_gicv3_its.c +++ b/hw/intc/arm_gicv3_its.c @@ -1194,9 +1194,6 @@ static void gicv3_arm_its_realize(DeviceState *dev, Error **errp) gicv3_its_init_mmio(s, &gicv3_its_control_ops, &gicv3_its_translation_ops); - address_space_init(&s->gicv3->dma_as, s->gicv3->dma, - "gicv3-its-sysmem"); - /* set the ITS default features supported */ s->typer = FIELD_DP64(s->typer, GITS_TYPER, PHYSICAL, 1); s->typer = FIELD_DP64(s->typer, GITS_TYPER, ITT_ENTRY_SIZE, -- cgit v1.1