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virtio-iommu: Implement set|unset]_iommu_device() callbacks

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Implement PCIIOMMUOPs [set|unset]_iommu_device() callbacks.
In set(), the HostIOMMUDevice handle is stored in a hash
table indexed by PCI BDF. The object will allow to retrieve
information related to the physical IOMMU.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Eric Auger 2024-06-14 11:52:52 +02:00 committed by Cédric Le Goater
parent dc169694ca
commit 817ef10da2
2 changed files with 84 additions and 0 deletions
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82
hw/virtio/virtio-iommu.c
View File

@ -69,6 +69,11 @@ typedef struct VirtIOIOMMUMapping {
uint32_t flags;
} VirtIOIOMMUMapping;
struct hiod_key {
PCIBus *bus;
uint8_t devfn;
};
static inline uint16_t virtio_iommu_get_bdf(IOMMUDevice *dev)
{
return PCI_BUILD_BDF(pci_bus_num(dev->bus), dev->devfn);
@ -462,8 +467,82 @@ static AddressSpace *virtio_iommu_find_add_as(PCIBus *bus, void *opaque,
return &sdev->as;
}
static gboolean hiod_equal(gconstpointer v1, gconstpointer v2)
{
const struct hiod_key *key1 = v1;
const struct hiod_key *key2 = v2;
return (key1->bus == key2->bus) && (key1->devfn == key2->devfn);
}
static guint hiod_hash(gconstpointer v)
{
const struct hiod_key *key = v;
guint value = (guint)(uintptr_t)key->bus;
return (guint)(value << 8 | key->devfn);
}
static void hiod_destroy(gpointer v)
{
object_unref(v);
}
static HostIOMMUDevice *
get_host_iommu_device(VirtIOIOMMU *viommu, PCIBus *bus, int devfn) {
struct hiod_key key = {
.bus = bus,
.devfn = devfn,
};
return g_hash_table_lookup(viommu->host_iommu_devices, &key);
}
static bool virtio_iommu_set_iommu_device(PCIBus *bus, void *opaque, int devfn,
HostIOMMUDevice *hiod, Error **errp)
{
VirtIOIOMMU *viommu = opaque;
struct hiod_key *new_key;
assert(hiod);
if (get_host_iommu_device(viommu, bus, devfn)) {
error_setg(errp, "Host IOMMU device already exists");
return false;
}
new_key = g_malloc(sizeof(*new_key));
new_key->bus = bus;
new_key->devfn = devfn;
object_ref(hiod);
g_hash_table_insert(viommu->host_iommu_devices, new_key, hiod);
return true;
}
static void
virtio_iommu_unset_iommu_device(PCIBus *bus, void *opaque, int devfn)
{
VirtIOIOMMU *viommu = opaque;
HostIOMMUDevice *hiod;
struct hiod_key key = {
.bus = bus,
.devfn = devfn,
};
hiod = g_hash_table_lookup(viommu->host_iommu_devices, &key);
if (!hiod) {
return;
}
g_hash_table_remove(viommu->host_iommu_devices, &key);
}
static const PCIIOMMUOps virtio_iommu_ops = {
.get_address_space = virtio_iommu_find_add_as,
.set_iommu_device = virtio_iommu_set_iommu_device,
.unset_iommu_device = virtio_iommu_unset_iommu_device,
};
static int virtio_iommu_attach(VirtIOIOMMU *s,
@ -1357,6 +1436,9 @@ static void virtio_iommu_device_realize(DeviceState *dev, Error **errp)
s->as_by_busptr = g_hash_table_new_full(NULL, NULL, NULL, g_free);
s->host_iommu_devices = g_hash_table_new_full(hiod_hash, hiod_equal,
g_free, hiod_destroy);
if (s->primary_bus) {
pci_setup_iommu(s->primary_bus, &virtio_iommu_ops, s);
} else {

2
include/hw/virtio/virtio-iommu.h
View File

@ -25,6 +25,7 @@
#include "hw/pci/pci.h"
#include "qom/object.h"
#include "qapi/qapi-types-virtio.h"
#include "sysemu/host_iommu_device.h"
#define TYPE_VIRTIO_IOMMU "virtio-iommu-device"
#define TYPE_VIRTIO_IOMMU_PCI "virtio-iommu-pci"
@ -57,6 +58,7 @@ struct VirtIOIOMMU {
struct virtio_iommu_config config;
uint64_t features;
GHashTable *as_by_busptr;
GHashTable *host_iommu_devices;
IOMMUPciBus *iommu_pcibus_by_bus_num[PCI_BUS_MAX];
PCIBus *primary_bus;
ReservedRegion *prop_resv_regions;