On 7/8/24 4:34 PM, Joao Martins wrote:
ioctl(iommufd, IOMMU_HWPT_SET_DIRTY_TRACKING, arg) is the UAPI that
enables or disables dirty page tracking. It is used if the hwpt
has been created with dirty tracking supported domain (stored in
hwpt::flags) and it is called on the whole list of iommu domains
it is are tracking. On failure it rolls it back.
The checking of hwpt::flags is introduced here as a second user
and thus consolidate such check into a helper function
iommufd_hwpt_dirty_tracking().
Signed-off-by: Joao Martins <joao.m.mart...@oracle.com>
---
include/sysemu/iommufd.h | 3 +++
backends/iommufd.c | 20 ++++++++++++++++++
hw/vfio/iommufd.c | 45 +++++++++++++++++++++++++++++++++++++++-
backends/trace-events | 1 +
4 files changed, 68 insertions(+), 1 deletion(-)
diff --git a/include/sysemu/iommufd.h b/include/sysemu/iommufd.h
index 35a8cec9780f..1470377f55ba 100644
--- a/include/sysemu/iommufd.h
+++ b/include/sysemu/iommufd.h
@@ -54,6 +54,9 @@ int iommufd_backend_alloc_hwpt(IOMMUFDBackend *be, uint32_t
dev_id,
uint32_t pt_id, uint32_t flags,
uint32_t data_type, uint32_t data_len,
void *data_ptr, uint32_t *out_hwpt);
+int iommufd_backend_set_dirty_tracking(IOMMUFDBackend *be, uint32_t hwpt_id,
+ bool start);
#define TYPE_HOST_IOMMU_DEVICE_IOMMUFD TYPE_HOST_IOMMU_DEVICE "-iommufd"
+
#endif
diff --git a/backends/iommufd.c b/backends/iommufd.c
index f5f73eaf4a1a..69daabc27473 100644
--- a/backends/iommufd.c
+++ b/backends/iommufd.c
@@ -237,6 +237,26 @@ int iommufd_backend_alloc_hwpt(IOMMUFDBackend *be,
uint32_t dev_id,
return ret;
}
+int iommufd_backend_set_dirty_tracking(IOMMUFDBackend *be, uint32_t hwpt_id,
+ bool start)
+{
+ int ret;
+ struct iommu_hwpt_set_dirty_tracking set_dirty = {
+ .size = sizeof(set_dirty),
+ .hwpt_id = hwpt_id,
+ .flags = !start ? 0 : IOMMU_HWPT_DIRTY_TRACKING_ENABLE,
+ };
+
+ ret = ioctl(be->fd, IOMMU_HWPT_SET_DIRTY_TRACKING, &set_dirty);
+ trace_iommufd_backend_set_dirty(be->fd, hwpt_id, start, ret);
+ if (ret) {
+ ret = -errno;
+ error_report("IOMMU_HWPT_SET_DIRTY_TRACKING failed: %s",
+ strerror(errno));
+ }
+ return ret;
+}
+
bool iommufd_backend_get_device_info(IOMMUFDBackend *be, uint32_t devid,
uint32_t *type, void *data, uint32_t len,
uint64_t *caps, Error **errp)
diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index 1b5b46d28ed6..158a98cb3b12 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -110,6 +110,48 @@ static void iommufd_cdev_unbind_and_disconnect(VFIODevice
*vbasedev)
iommufd_backend_disconnect(vbasedev->iommufd);
}
+static bool iommufd_hwpt_dirty_tracking(VFIOIOASHwpt *hwpt)
+{
+ return hwpt->hwpt_flags & IOMMU_HWPT_ALLOC_DIRTY_TRACKING;
+}
+
+static int iommufd_set_dirty_page_tracking(const VFIOContainerBase *bcontainer,
+ bool start, Error **errp)
+{
+ const VFIOIOMMUFDContainer *container =
+ container_of(bcontainer, VFIOIOMMUFDContainer, bcontainer);
+ int ret;
+ VFIOIOASHwpt *hwpt;
+
+ QLIST_FOREACH(hwpt, &container->hwpt_list, next) {
+ if (!iommufd_hwpt_dirty_tracking(hwpt)) {
+ continue;
+ }
+
+ ret = iommufd_backend_set_dirty_tracking(container->be,
+ hwpt->hwpt_id, start);
+ if (ret) {
+ ret = -errno;
+ error_setg_errno(errp, errno,
+ "Failed to start dirty tracking on hwpt_id %u",
+ hwpt->hwpt_id);
This error looks redundant with the one printed out in the lower backend
version. Couldn't we add an 'Error **' parameter and return a bool ?
Thanks,
C.
+ goto err;
+ }
+ }
+
+ return 0;
+
+err:
+ QLIST_FOREACH(hwpt, &container->hwpt_list, next) {
+ if (!iommufd_hwpt_dirty_tracking(hwpt)) {
+ continue;
+ }
+ iommufd_backend_set_dirty_tracking(container->be,
+ hwpt->hwpt_id, !start);
+ }
+ return ret;
+}
+
static int iommufd_cdev_getfd(const char *sysfs_path, Error **errp)
{
ERRP_GUARD();
@@ -292,7 +334,7 @@ static bool iommufd_cdev_autodomains_get(VFIODevice
*vbasedev,
QLIST_INSERT_HEAD(&hwpt->device_list, vbasedev, hwpt_next);
QLIST_INSERT_HEAD(&container->hwpt_list, hwpt, next);
container->bcontainer.dirty_pages_supported |=
- (flags & IOMMU_HWPT_ALLOC_DIRTY_TRACKING);
+ iommufd_hwpt_dirty_tracking(hwpt);
return true;
}
@@ -734,6 +776,7 @@ static void vfio_iommu_iommufd_class_init(ObjectClass *klass, void *data)
vioc->attach_device = iommufd_cdev_attach;
vioc->detach_device = iommufd_cdev_detach;
vioc->pci_hot_reset = iommufd_cdev_pci_hot_reset;
+ vioc->set_dirty_page_tracking = iommufd_set_dirty_page_tracking;
};
static bool hiod_iommufd_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
diff --git a/backends/trace-events b/backends/trace-events
index 4d8ac02fe7d6..28aca3b859d4 100644
--- a/backends/trace-events
+++ b/backends/trace-events
@@ -16,3 +16,4 @@ iommufd_backend_unmap_dma(int iommufd, uint32_t ioas,
uint64_t iova, uint64_t si
iommufd_backend_alloc_ioas(int iommufd, uint32_t ioas) " iommufd=%d ioas=%d"
iommufd_backend_alloc_hwpt(int iommufd, uint32_t dev_id, uint32_t pt_id, uint32_t flags, uint32_t
hwpt_type, uint32_t len, uint64_t data_ptr, uint32_t out_hwpt_id, int ret) " iommufd=%d
dev_id=%u pt_id=%u flags=0x%x hwpt_type=%u len=%u data_ptr=0x%"PRIx64" out_hwpt=%u
(%d)"
iommufd_backend_free_id(int iommufd, uint32_t id, int ret) " iommufd=%d id=%d
(%d)"
+iommufd_backend_set_dirty(int iommufd, uint32_t hwpt_id, bool start, int ret) "
iommufd=%d hwpt=%u enable=%d (%d)"
