diff options
| -rw-r--r-- | drivers/virtio/virtio_mem.c | 55 |
1 files changed, 12 insertions, 43 deletions
diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c index 80cdb9e6b3c4..8dd57b61b09b 100644 --- a/drivers/virtio/virtio_mem.c +++ b/drivers/virtio/virtio_mem.c @@ -1616,23 +1616,6 @@ static int virtio_mem_init_vq(struct virtio_mem *vm) return 0; } -/* - * Test if any memory in the range is present in Linux. - */ -static bool virtio_mem_any_memory_present(unsigned long start, - unsigned long size) -{ - const unsigned long start_pfn = PFN_DOWN(start); - const unsigned long end_pfn = PFN_UP(start + size); - unsigned long pfn; - - for (pfn = start_pfn; pfn != end_pfn; pfn++) - if (present_section_nr(pfn_to_section_nr(pfn))) - return true; - - return false; -} - static int virtio_mem_init(struct virtio_mem *vm) { const uint64_t phys_limit = 1UL << MAX_PHYSMEM_BITS; @@ -1665,32 +1648,6 @@ static int virtio_mem_init(struct virtio_mem *vm) &vm->region_size); /* - * If we still have memory plugged, we might have to unplug all - * memory first. However, if somebody simply unloaded the driver - * we would have to reinitialize the old state - something we don't - * support yet. Detect if we have any memory in the area present. - */ - if (vm->plugged_size) { - uint64_t usable_region_size; - - virtio_cread(vm->vdev, struct virtio_mem_config, - usable_region_size, &usable_region_size); - - if (virtio_mem_any_memory_present(vm->addr, - usable_region_size)) { - dev_err(&vm->vdev->dev, - "reloading the driver is not supported\n"); - return -EINVAL; - } - /* - * Note: it might happen that the device is busy and - * unplugging all memory might take some time. - */ - dev_info(&vm->vdev->dev, "unplugging all memory required\n"); - vm->unplug_all_required = 1; - } - - /* * We always hotplug memory in memory block granularity. This way, * we have to wait for exactly one memory block to online. */ @@ -1760,6 +1717,8 @@ static int virtio_mem_create_resource(struct virtio_mem *vm) if (!vm->parent_resource) { kfree(name); dev_warn(&vm->vdev->dev, "could not reserve device region\n"); + dev_info(&vm->vdev->dev, + "reloading the driver is not supported\n"); return -EBUSY; } @@ -1816,6 +1775,16 @@ static int virtio_mem_probe(struct virtio_device *vdev) if (rc) goto out_del_vq; + /* + * If we still have memory plugged, we have to unplug all memory first. + * Registering our parent resource makes sure that this memory isn't + * actually in use (e.g., trying to reload the driver). + */ + if (vm->plugged_size) { + vm->unplug_all_required = 1; + dev_info(&vm->vdev->dev, "unplugging all memory is required\n"); + } + /* register callbacks */ vm->memory_notifier.notifier_call = virtio_mem_memory_notifier_cb; rc = register_memory_notifier(&vm->memory_notifier); |