For vfio-user, device operations such as IRQ handling and region
read/writes are implemented in userspace over the control socket, not
ioctl() to the vfio kernel driver; add an ops vector to generalize this,
and implement vfio_device_io_ops_ioctl for interacting with the kernel
vfio driver.
Originally-by: John Johnson <john.g.john...@oracle.com>
Signed-off-by: Elena Ufimtseva <elena.ufimts...@oracle.com>
Signed-off-by: Jagannathan Raman <jag.ra...@oracle.com>
Signed-off-by: John Levon <john.le...@nutanix.com>
---
hw/vfio/container-base.c | 6 +--
hw/vfio/device.c | 77 ++++++++++++++++++++++++++++++-----
hw/vfio/listener.c | 13 +++---
hw/vfio/pci.c | 10 ++---
include/hw/vfio/vfio-device.h | 38 +++++++++++++++++
5 files changed, 117 insertions(+), 27 deletions(-)
diff --git a/hw/vfio/container-base.c b/hw/vfio/container-base.c
index 3ff473a45c..1c6ca94b60 100644
--- a/hw/vfio/container-base.c
+++ b/hw/vfio/container-base.c
@@ -198,11 +198,7 @@ static int vfio_device_dma_logging_report(VFIODevice
*vbasedev, hwaddr iova,
feature->flags = VFIO_DEVICE_FEATURE_GET |
VFIO_DEVICE_FEATURE_DMA_LOGGING_REPORT;
- if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
- return -errno;
- }
-
- return 0;
+ return vbasedev->io_ops->device_feature(vbasedev, feature);
}
static int vfio_container_iommu_query_dirty_bitmap(const VFIOContainerBase
*bcontainer,
diff --git a/hw/vfio/device.c b/hw/vfio/device.c
index 5d837092cb..468fb50eac 100644
--- a/hw/vfio/device.c
+++ b/hw/vfio/device.c
@@ -82,7 +82,7 @@ void vfio_device_irq_disable(VFIODevice *vbasedev, int index)
.count = 0,
};
- ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
+ vbasedev->io_ops->set_irqs(vbasedev, &irq_set);
}
void vfio_device_irq_unmask(VFIODevice *vbasedev, int index)
@@ -95,7 +95,7 @@ void vfio_device_irq_unmask(VFIODevice *vbasedev, int index)
.count = 1,
};
- ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
+ vbasedev->io_ops->set_irqs(vbasedev, &irq_set);
}
void vfio_device_irq_mask(VFIODevice *vbasedev, int index)
@@ -108,7 +108,7 @@ void vfio_device_irq_mask(VFIODevice *vbasedev, int index)
.count = 1,
};
- ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
+ vbasedev->io_ops->set_irqs(vbasedev, &irq_set);
}
static inline const char *action_to_str(int action)
@@ -155,6 +155,7 @@ bool vfio_device_irq_set_signaling(VFIODevice *vbasedev,
int index, int subindex
int argsz;
const char *name;
int32_t *pfd;
+ int ret;
argsz = sizeof(*irq_set) + sizeof(*pfd);
@@ -167,7 +168,9 @@ bool vfio_device_irq_set_signaling(VFIODevice *vbasedev,
int index, int subindex
pfd = (int32_t *)&irq_set->data;
*pfd = fd;
- if (!ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irq_set)) {
+ ret = vbasedev->io_ops->set_irqs(vbasedev, irq_set);
+
+ if (!ret) {
return true;
}
@@ -188,22 +191,19 @@ bool vfio_device_irq_set_signaling(VFIODevice *vbasedev,
int index, int subindex
int vfio_device_get_irq_info(VFIODevice *vbasedev, int index,
struct vfio_irq_info *info)
{
- int ret;
-
memset(info, 0, sizeof(*info));
info->argsz = sizeof(*info);
info->index = index;
- ret = ioctl(vbasedev->fd, VFIO_DEVICE_GET_IRQ_INFO, info);
-
- return ret < 0 ? -errno : ret;
+ return vbasedev->io_ops->get_irq_info(vbasedev, info);
}
int vfio_device_get_region_info(VFIODevice *vbasedev, int index,
struct vfio_region_info **info)
{
size_t argsz = sizeof(struct vfio_region_info);
+ int ret;
*info = g_malloc0(argsz);
@@ -211,10 +211,11 @@ int vfio_device_get_region_info(VFIODevice *vbasedev, int
index,
retry:
(*info)->argsz = argsz;
- if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) {
+ ret = vbasedev->io_ops->get_region_info(vbasedev, *info);
+ if (ret != 0) {
g_free(*info);
*info = NULL;
- return -errno;
+ return ret;
}
if ((*info)->argsz > argsz) {
@@ -320,11 +321,14 @@ void vfio_device_set_fd(VFIODevice *vbasedev, const char
*str, Error **errp)
vbasedev->fd = fd;
}
+static VFIODeviceIOOps vfio_device_io_ops_ioctl;
+
void vfio_device_init(VFIODevice *vbasedev, int type, VFIODeviceOps *ops,
DeviceState *dev, bool ram_discard)
{
vbasedev->type = type;
vbasedev->ops = ops;
+ vbasedev->io_ops = &vfio_device_io_ops_ioctl;
vbasedev->dev = dev;
vbasedev->fd = -1;
@@ -442,3 +446,54 @@ void vfio_device_unprepare(VFIODevice *vbasedev)
QLIST_REMOVE(vbasedev, global_next);
vbasedev->bcontainer = NULL;
}
+
+/*
+ * Traditional ioctl() based io
+ */
+
+static int vfio_device_io_device_feature(VFIODevice *vbasedev,
+ struct vfio_device_feature *feature)
+{
+ int ret;
+
+ ret = ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature);
+
+ return ret < 0 ? -errno : ret;
+}
+
+static int vfio_device_io_get_region_info(VFIODevice *vbasedev,
+ struct vfio_region_info *info)
+{
+ int ret;
+
+ ret = ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, info);
+
+ return ret < 0 ? -errno : ret;
+}
+
+static int vfio_device_io_get_irq_info(VFIODevice *vbasedev,
+ struct vfio_irq_info *info)
+{
+ int ret;
+
+ ret = ioctl(vbasedev->fd, VFIO_DEVICE_GET_IRQ_INFO, info);
+
+ return ret < 0 ? -errno : ret;
+}
+
+static int vfio_device_io_set_irqs(VFIODevice *vbasedev,
+ struct vfio_irq_set *irqs)
+{
+ int ret;
+
+ ret = ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irqs);
+
+ return ret < 0 ? -errno : ret;
+}
+
+static VFIODeviceIOOps vfio_device_io_ops_ioctl = {
+ .device_feature = vfio_device_io_device_feature,
+ .get_region_info = vfio_device_io_get_region_info,
+ .get_irq_info = vfio_device_io_get_irq_info,
+ .set_irqs = vfio_device_io_set_irqs,
+};
diff --git a/hw/vfio/listener.c b/hw/vfio/listener.c
index e7ade7d62e..2b93ca55b6 100644
--- a/hw/vfio/listener.c
+++ b/hw/vfio/listener.c
@@ -794,13 +794,17 @@ static void
vfio_devices_dma_logging_stop(VFIOContainerBase *bcontainer)
VFIO_DEVICE_FEATURE_DMA_LOGGING_STOP;
QLIST_FOREACH(vbasedev, &bcontainer->device_list, container_next) {
+ int ret;
+
if (!vbasedev->dirty_tracking) {
continue;
}
- if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
+ ret = vbasedev->io_ops->device_feature(vbasedev, feature);
+
+ if (ret != 0) {
warn_report("%s: Failed to stop DMA logging, err %d (%s)",
- vbasedev->name, -errno, strerror(errno));
+ vbasedev->name, -ret, strerror(-ret));
}
vbasedev->dirty_tracking = false;
}
@@ -901,10 +905,9 @@ static bool
vfio_devices_dma_logging_start(VFIOContainerBase *bcontainer,
continue;
}
- ret = ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature);
+ ret = vbasedev->io_ops->device_feature(vbasedev, feature);
if (ret) {
- ret = -errno;
- error_setg_errno(errp, errno, "%s: Failed to start DMA logging",
+ error_setg_errno(errp, -ret, "%s: Failed to start DMA logging",
vbasedev->name);
goto out;
}
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 8455010d62..bbf95215cc 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -381,7 +381,7 @@ static void vfio_msi_interrupt(void *opaque)
static int vfio_enable_msix_no_vec(VFIOPCIDevice *vdev)
{
g_autofree struct vfio_irq_set *irq_set = NULL;
- int ret = 0, argsz;
+ int argsz;
int32_t *fd;
argsz = sizeof(*irq_set) + sizeof(*fd);
@@ -396,9 +396,7 @@ static int vfio_enable_msix_no_vec(VFIOPCIDevice *vdev)
fd = (int32_t *)&irq_set->data;
*fd = -1;
- ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set);
-
- return ret < 0 ? -errno : ret;
+ return vdev->vbasedev.io_ops->set_irqs(&vdev->vbasedev, irq_set);
}
static int vfio_enable_vectors(VFIOPCIDevice *vdev, bool msix)
@@ -455,11 +453,11 @@ static int vfio_enable_vectors(VFIOPCIDevice *vdev, bool
msix)
fds[i] = fd;
}
- ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_SET_IRQS, irq_set);
+ ret = vdev->vbasedev.io_ops->set_irqs(&vdev->vbasedev, irq_set);
g_free(irq_set);
- return ret < 0 ? -errno : ret;
+ return ret;
}
static void vfio_add_kvm_msi_virq(VFIOPCIDevice *vdev, VFIOMSIVector *vector,
diff --git a/include/hw/vfio/vfio-device.h b/include/hw/vfio/vfio-device.h
index 5b833868c9..e89ed02c0e 100644
--- a/include/hw/vfio/vfio-device.h
+++ b/include/hw/vfio/vfio-device.h
@@ -41,6 +41,7 @@ enum {
};
typedef struct VFIODeviceOps VFIODeviceOps;
+typedef struct VFIODeviceIOOps VFIODeviceIOOps;
typedef struct VFIOMigration VFIOMigration;
typedef struct IOMMUFDBackend IOMMUFDBackend;
@@ -66,6 +67,7 @@ typedef struct VFIODevice {
OnOffAuto migration_multifd_transfer;
bool migration_events;
VFIODeviceOps *ops;
+ VFIODeviceIOOps *io_ops;
unsigned int num_irqs;
unsigned int num_regions;
unsigned int flags;
@@ -141,6 +143,42 @@ typedef QLIST_HEAD(VFIODeviceList, VFIODevice)
VFIODeviceList;
extern VFIODeviceList vfio_device_list;
#ifdef CONFIG_LINUX
+/*
+ * How devices communicate with the server. The default option is through
+ * ioctl() to the kernel VFIO driver, but vfio-user can use a socket to a
remote
+ * process.
+ */
+struct VFIODeviceIOOps {
+ /**
+ * @device_feature
+ *
+ * Fill in feature info for the given device.
+ */
+ int (*device_feature)(VFIODevice *vdev, struct vfio_device_feature *);
+
+ /**
+ * @get_region_info
+ *
+ * Fill in @info with information on the region given by @info->index.
+ */
+ int (*get_region_info)(VFIODevice *vdev,
+ struct vfio_region_info *info);
+
+ /**
+ * @get_irq_info
+ *
+ * Fill in @irq with information on the IRQ given by @info->index.
+ */
+ int (*get_irq_info)(VFIODevice *vdev, struct vfio_irq_info *irq);
+
+ /**
+ * @set_irqs
+ *
+ * Configure IRQs as defined by @irqs.
+ */
+ int (*set_irqs)(VFIODevice *vdev, struct vfio_irq_set *irqs);
+};
+
int vfio_device_get_region_info(VFIODevice *vbasedev, int index,
struct vfio_region_info **info);
int vfio_device_get_region_info_type(VFIODevice *vbasedev, uint32_t type,
--
2.43.0
