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authorDavid Hildenbrand <david@redhat.com>2020-11-12 16:37:57 +0300
committerMichael S. Tsirkin <mst@redhat.com>2020-12-19 00:14:26 +0300
commit989ff82527074b79bc89ba1c390be1eda01784a5 (patch)
tree2f1af38c9dba0fa7aa3a87170c42c19d6cef45fa /drivers/virtio
parentf2d799d591359685a3a74d28c2989c56f4bb9898 (diff)
downloadlinux-989ff82527074b79bc89ba1c390be1eda01784a5.tar.xz
virtio-mem: generalize check for added memory
Let's check by traversing busy system RAM resources instead, to avoid relying on memory block states. Don't use walk_system_ram_range(), as that works on pages and we want to use the bare addresses we have easily at hand. This is a preparation for Big Block Mode (BBM), which won't have memory block states. Reviewed-by: Wei Yang <richard.weiyang@linux.alibaba.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Signed-off-by: David Hildenbrand <david@redhat.com> Link: https://lore.kernel.org/r/20201112133815.13332-12-david@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio')
-rw-r--r--drivers/virtio/virtio_mem.c19
1 files changed, 15 insertions, 4 deletions
diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
index 2f1ce4d4781b..3731097cd9e8 100644
--- a/drivers/virtio/virtio_mem.c
+++ b/drivers/virtio/virtio_mem.c
@@ -1833,6 +1833,20 @@ static void virtio_mem_delete_resource(struct virtio_mem *vm)
vm->parent_resource = NULL;
}
+static int virtio_mem_range_has_system_ram(struct resource *res, void *arg)
+{
+ return 1;
+}
+
+static bool virtio_mem_has_memory_added(struct virtio_mem *vm)
+{
+ const unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+
+ return walk_iomem_res_desc(IORES_DESC_NONE, flags, vm->addr,
+ vm->addr + vm->region_size, NULL,
+ virtio_mem_range_has_system_ram) == 1;
+}
+
static int virtio_mem_probe(struct virtio_device *vdev)
{
struct virtio_mem *vm;
@@ -1954,10 +1968,7 @@ static void virtio_mem_remove(struct virtio_device *vdev)
* the system. And there is no way to stop the driver/device from going
* away. Warn at least.
*/
- if (vm->nb_mb_state[VIRTIO_MEM_MB_STATE_OFFLINE] ||
- vm->nb_mb_state[VIRTIO_MEM_MB_STATE_OFFLINE_PARTIAL] ||
- vm->nb_mb_state[VIRTIO_MEM_MB_STATE_ONLINE] ||
- vm->nb_mb_state[VIRTIO_MEM_MB_STATE_ONLINE_PARTIAL]) {
+ if (virtio_mem_has_memory_added(vm)) {
dev_warn(&vdev->dev, "device still has system memory added\n");
} else {
virtio_mem_delete_resource(vm);