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hw/intc/arm_gicv3: Make reserved register addresses RAZ/WI 

The GICv3 specification says that reserved register addresses
should RAZ/WI. This means we need to return MEMTX_OK, not MEMTX_ERROR,
because now that we support generating external aborts the
latter will cause an abort on new board models.

Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1513183941-24300-2-git-send-email-peter.maydell@linaro.org
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
master
Peter Maydell 2018-01-11 13:25:40 +00:00
parent 2eea841c11
commit f1945632b4
3 changed files with 29 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
hw/intc/arm_gicv3_dist.c
View File

@ -817,6 +817,13 @@ MemTxResult gicv3_dist_read(void *opaque, hwaddr offset, uint64_t *data,
"%s: invalid guest read at offset " TARGET_FMT_plx
"size %u\n", __func__, offset, size);
trace_gicv3_dist_badread(offset, size, attrs.secure);
/* The spec requires that reserved registers are RAZ/WI;
* so use MEMTX_ERROR returns from leaf functions as a way to
* trigger the guest-error logging but don't return it to
* the caller, or we'll cause a spurious guest data abort.
*/
r = MEMTX_OK;
*data = 0;
} else {
trace_gicv3_dist_read(offset, *data, size, attrs.secure);
}
@ -852,6 +859,12 @@ MemTxResult gicv3_dist_write(void *opaque, hwaddr offset, uint64_t data,
"%s: invalid guest write at offset " TARGET_FMT_plx
"size %u\n", __func__, offset, size);
trace_gicv3_dist_badwrite(offset, data, size, attrs.secure);
/* The spec requires that reserved registers are RAZ/WI;
* so use MEMTX_ERROR returns from leaf functions as a way to
* trigger the guest-error logging but don't return it to
* the caller, or we'll cause a spurious guest data abort.
*/
r = MEMTX_OK;
} else {
trace_gicv3_dist_write(offset, data, size, attrs.secure);
}

8
hw/intc/arm_gicv3_its_common.c
View File

@ -67,7 +67,8 @@ static MemTxResult gicv3_its_trans_read(void *opaque, hwaddr offset,
MemTxAttrs attrs)
{
qemu_log_mask(LOG_GUEST_ERROR, "ITS read at offset 0x%"PRIx64"\n", offset);
return MEMTX_ERROR;
*data = 0;
return MEMTX_OK;
}
static MemTxResult gicv3_its_trans_write(void *opaque, hwaddr offset,
@ -82,15 +83,12 @@ static MemTxResult gicv3_its_trans_write(void *opaque, hwaddr offset,
if (ret <= 0) {
qemu_log_mask(LOG_GUEST_ERROR,
"ITS: Error sending MSI: %s\n", strerror(-ret));
return MEMTX_DECODE_ERROR;
}
return MEMTX_OK;
} else {
qemu_log_mask(LOG_GUEST_ERROR,
"ITS write at bad offset 0x%"PRIx64"\n", offset);
return MEMTX_DECODE_ERROR;
}
return MEMTX_OK;
}
static const MemoryRegionOps gicv3_its_trans_ops = {

13
hw/intc/arm_gicv3_redist.c
View File

@ -455,6 +455,13 @@ MemTxResult gicv3_redist_read(void *opaque, hwaddr offset, uint64_t *data,
"size %u\n", __func__, offset, size);
trace_gicv3_redist_badread(gicv3_redist_affid(cs), offset,
size, attrs.secure);
/* The spec requires that reserved registers are RAZ/WI;
* so use MEMTX_ERROR returns from leaf functions as a way to
* trigger the guest-error logging but don't return it to
* the caller, or we'll cause a spurious guest data abort.
*/
r = MEMTX_OK;
*data = 0;
} else {
trace_gicv3_redist_read(gicv3_redist_affid(cs), offset, *data,
size, attrs.secure);
@ -505,6 +512,12 @@ MemTxResult gicv3_redist_write(void *opaque, hwaddr offset, uint64_t data,
"size %u\n", __func__, offset, size);
trace_gicv3_redist_badwrite(gicv3_redist_affid(cs), offset, data,
size, attrs.secure);
/* The spec requires that reserved registers are RAZ/WI;
* so use MEMTX_ERROR returns from leaf functions as a way to
* trigger the guest-error logging but don't return it to
* the caller, or we'll cause a spurious guest data abort.
*/
r = MEMTX_OK;
} else {
trace_gicv3_redist_write(gicv3_redist_affid(cs), offset, data,
size, attrs.secure);