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qdev: Introduce DEFINE_PROP_RESERVED_REGION

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Introduce a new property defining a reserved region:
<low address>:<high address>:<type>.

This will be used to encode reserved IOVA regions.

For instance, in virtio-iommu use case, reserved IOVA regions
will be passed by the machine code to the virtio-iommu-pci
device (an array of those). The type of the reserved region
will match the virtio_iommu_probe_resv_mem subtype value:
- VIRTIO_IOMMU_RESV_MEM_T_RESERVED (0)
- VIRTIO_IOMMU_RESV_MEM_T_MSI (1)

on PC/Q35 machine, this will be used to inform the
virtio-iommu-pci device it should bypass the MSI region.
The reserved region will be: 0xfee00000:0xfeefffff:1.

On ARM, we can declare the ITS MSI doorbell as an MSI
region to prevent MSIs from being mapped on guest side.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-id: 20200629070404.10969-2-eric.auger@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Eric Auger 2020-07-03 16:59:41 +01:00 • committed by Peter Maydell
parent 6552bbc6a3
commit f78069253c
4 changed files with 99 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

89
hw/core/qdev-properties.c
View file

@ -15,6 +15,7 @@
#include "chardev/char.h"
#include "qemu/uuid.h"
#include "qemu/units.h"
#include "qemu/cutils.h"
void qdev_prop_set_after_realize(DeviceState *dev, const char *name,
Error **errp)
@ -578,6 +579,94 @@ const PropertyInfo qdev_prop_macaddr = {
.set = set_mac,
};
/* --- Reserved Region --- */
/*
* Accepted syntax:
* <low address>:<high address>:<type>
* where low/high addresses are uint64_t in hexadecimal
* and type is a non-negative decimal integer
*/
static void get_reserved_region(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
DeviceState *dev = DEVICE(obj);
Property *prop = opaque;
ReservedRegion *rr = qdev_get_prop_ptr(dev, prop);
char buffer[64];
char *p = buffer;
int rc;
rc = snprintf(buffer, sizeof(buffer), "0x%"PRIx64":0x%"PRIx64":%u",
rr->low, rr->high, rr->type);
assert(rc < sizeof(buffer));
visit_type_str(v, name, &p, errp);
}
static void set_reserved_region(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
DeviceState *dev = DEVICE(obj);
Property *prop = opaque;
ReservedRegion *rr = qdev_get_prop_ptr(dev, prop);
Error *local_err = NULL;
const char *endptr;
char *str;
int ret;
if (dev->realized) {
qdev_prop_set_after_realize(dev, name, errp);
return;
}
visit_type_str(v, name, &str, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
ret = qemu_strtou64(str, &endptr, 16, &rr->low);
if (ret) {
error_setg(errp, "start address of '%s'"
" must be a hexadecimal integer", name);
goto out;
}
if (*endptr != ':') {
goto separator_error;
}
ret = qemu_strtou64(endptr + 1, &endptr, 16, &rr->high);
if (ret) {
error_setg(errp, "end address of '%s'"
" must be a hexadecimal integer", name);
goto out;
}
if (*endptr != ':') {
goto separator_error;
}
ret = qemu_strtoui(endptr + 1, &endptr, 10, &rr->type);
if (ret) {
error_setg(errp, "type of '%s'"
" must be a non-negative decimal integer", name);
}
goto out;
separator_error:
error_setg(errp, "reserved region fields must be separated with ':'");
out:
g_free(str);
return;
}
const PropertyInfo qdev_prop_reserved_region = {
.name = "reserved_region",
.description = "Reserved Region, example: 0xFEE00000:0xFEEFFFFF:0",
.get = get_reserved_region,
.set = set_reserved_region,
};
/* --- on/off/auto --- */
const PropertyInfo qdev_prop_on_off_auto = {