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From: Peter Maydell <peter.maydell@linaro.org>
To: qemu-devel@nongnu.org
Subject: [PULL 26/32] hw/intc/arm_gicv3_its: Provide read accessor for
translation_ops
Date: Fri, 28 Jan 2022 15:30:03 +0000
Message-Id: <20220128153009.2467560-27-peter.maydell@linaro.org>
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The MemoryRegionOps gicv3_its_translation_ops currently provides only
a .write_with_attrs function, because the only register in this
region is the write-only GITS_TRANSLATER. However, if you don't
provide a read function and the guest tries reading from this memory
region, QEMU will crash because
memory_region_read_with_attrs_accessor() calls a NULL pointer.
Add a read function which always returns 0, to cover both bogus
attempts to read GITS_TRANSLATER and also reads from the rest of the
region, which is documented to be reserved, RES0.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daud=C3=A9 <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220122182444.724087-11-peter.maydell@linaro.org
---
hw/intc/arm_gicv3_its.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/hw/intc/arm_gicv3_its.c b/hw/intc/arm_gicv3_its.c
index d9ff7b88492..b17f2631269 100644
--- a/hw/intc/arm_gicv3_its.c
+++ b/hw/intc/arm_gicv3_its.c
@@ -813,6 +813,18 @@ static void extract_cmdq_params(GICv3ITSState *s)
}
}
=20
+static MemTxResult gicv3_its_translation_read(void *opaque, hwaddr offset,
+ uint64_t *data, unsigned siz=
e,
+ MemTxAttrs attrs)
+{
+ /*
+ * GITS_TRANSLATER is write-only, and all other addresses
+ * in the interrupt translation space frame are RES0.
+ */
+ *data =3D 0;
+ return MEMTX_OK;
+}
+
static MemTxResult gicv3_its_translation_write(void *opaque, hwaddr offset,
uint64_t data, unsigned siz=
e,
MemTxAttrs attrs)
@@ -1168,6 +1180,7 @@ static const MemoryRegionOps gicv3_its_control_ops =
=3D {
};
=20
static const MemoryRegionOps gicv3_its_translation_ops =3D {
+ .read_with_attrs =3D gicv3_its_translation_read,
.write_with_attrs =3D gicv3_its_translation_write,
.valid.min_access_size =3D 2,
.valid.max_access_size =3D 4,
--=20
2.25.1