Pass-through devices of a VM are not necessarily in the same group and
all groups/address_spaces need to be scanned when the machine is
reset. Commit f16f39c3fc97 ("Implement PCI hot reset") introduced a VM
reset handler for this purpose. Move it under device.c
Also reintroduce the comment which explained the context and was lost
along the way.
Signed-off-by: Cédric Le Goater <clg@redhat.com>
---
hw/vfio/common.c | 18 ------------------
hw/vfio/device.c | 35 +++++++++++++++++++++++++++++++++++
hw/vfio/trace-events | 2 +-
3 files changed, 36 insertions(+), 19 deletions(-)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index a4052526ece5fdee0e690ad133416d1dc4eb1815..e62bb3818c55a789e81fe50cebf7c6693228db31 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1301,21 +1301,3 @@ const MemoryListener vfio_memory_listener = {
.log_global_stop = vfio_listener_log_global_stop,
.log_sync = vfio_listener_log_sync,
};
-
-void vfio_reset_handler(void *opaque)
-{
- VFIODevice *vbasedev;
-
- trace_vfio_reset_handler();
- QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) {
- if (vbasedev->dev->realized) {
- vbasedev->ops->vfio_compute_needs_reset(vbasedev);
- }
- }
-
- QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) {
- if (vbasedev->dev->realized && vbasedev->needs_reset) {
- vbasedev->ops->vfio_hot_reset_multi(vbasedev);
- }
- }
-}
diff --git a/hw/vfio/device.c b/hw/vfio/device.c
index 179c9fb8decc42dcd8d1b4fe10e7acaa2a6f2c7c..e122c797c206c285ef26c3a56d841d8c3be8b58b 100644
--- a/hw/vfio/device.c
+++ b/hw/vfio/device.c
@@ -34,6 +34,41 @@
VFIODeviceList vfio_device_list =
QLIST_HEAD_INITIALIZER(vfio_device_list);
+/*
+ * We want to differentiate hot reset of multiple in-use devices vs
+ * hot reset of a single in-use device. VFIO_DEVICE_RESET will already
+ * handle the case of doing hot resets when there is only a single
+ * device per bus. The in-use here refers to how many VFIODevices are
+ * affected. A hot reset that affects multiple devices, but only a
+ * single in-use device, means that we can call it from our bus
+ * ->reset() callback since the extent is effectively a single
+ * device. This allows us to make use of it in the hotplug path. When
+ * there are multiple in-use devices, we can only trigger the hot
+ * reset during a system reset and thus from our reset handler. We
+ * separate _one vs _multi here so that we don't overlap and do a
+ * double reset on the system reset path where both our reset handler
+ * and ->reset() callback are used. Calling _one() will only do a hot
+ * reset for the one in-use devices case, calling _multi() will do
+ * nothing if a _one() would have been sufficient.
+ */
+void vfio_reset_handler(void *opaque)
+{
+ VFIODevice *vbasedev;
+
+ trace_vfio_reset_handler();
+ QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) {
+ if (vbasedev->dev->realized) {
+ vbasedev->ops->vfio_compute_needs_reset(vbasedev);
+ }
+ }
+
+ QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) {
+ if (vbasedev->dev->realized && vbasedev->needs_reset) {
+ vbasedev->ops->vfio_hot_reset_multi(vbasedev);
+ }
+ }
+}
+
/*
* Common VFIO interrupt disable
*/
diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
index 590d9674cf7bc47171516082abaf398dda72b86d..9fee7df8764978723f79dc60d3dc796777278858 100644
--- a/hw/vfio/trace-events
+++ b/hw/vfio/trace-events
@@ -108,7 +108,6 @@ vfio_put_base_device(int fd) "close vdev->fd=%d"
vfio_legacy_dma_unmap_overflow_workaround(void) ""
vfio_get_dirty_bitmap(uint64_t iova, uint64_t size, uint64_t bitmap_size, uint64_t start, uint64_t dirty_pages) "iova=0x%"PRIx64" size= 0x%"PRIx64" bitmap_size=0x%"PRIx64" start=0x%"PRIx64" dirty_pages=%"PRIu64
vfio_iommu_map_dirty_notify(uint64_t iova_start, uint64_t iova_end) "iommu dirty @ 0x%"PRIx64" - 0x%"PRIx64
-vfio_reset_handler(void) ""
# region.c
vfio_region_write(const char *name, int index, uint64_t addr, uint64_t data, unsigned size) " (%s:region%d+0x%"PRIx64", 0x%"PRIx64 ", %d)"
@@ -196,3 +195,4 @@ iommufd_cdev_pci_hot_reset_dep_devices(int domain, int bus, int slot, int functi
# device.c
vfio_get_dev_region(const char *name, int index, uint32_t type, uint32_t subtype) "%s index %d, %08x/%08x"
+vfio_reset_handler(void) ""
--
2.49.0