virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON
The VIRTIO_BALLOON_F_PAGE_POISON feature bit is used to indicate if the guest is using page poisoning. Guest writes to the poison_val config field to tell host about the page poisoning value that is in use. Suggested-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Wei Wang <wei.w.wang@intel.com> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>hifive-unleashed-5.1
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d95f58f4a6
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2e991629bc
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@ -825,6 +825,7 @@ static int virtio_balloon_register_shrinker(struct virtio_balloon *vb)
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static int virtballoon_probe(struct virtio_device *vdev)
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static int virtballoon_probe(struct virtio_device *vdev)
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{
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{
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struct virtio_balloon *vb;
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struct virtio_balloon *vb;
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__u32 poison_val;
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int err;
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int err;
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if (!vdev->config->get) {
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if (!vdev->config->get) {
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@ -892,6 +893,11 @@ static int virtballoon_probe(struct virtio_device *vdev)
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vb->num_free_page_blocks = 0;
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vb->num_free_page_blocks = 0;
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spin_lock_init(&vb->free_page_list_lock);
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spin_lock_init(&vb->free_page_list_lock);
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INIT_LIST_HEAD(&vb->free_page_list);
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INIT_LIST_HEAD(&vb->free_page_list);
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if (virtio_has_feature(vdev, VIRTIO_BALLOON_F_PAGE_POISON)) {
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memset(&poison_val, PAGE_POISON, sizeof(poison_val));
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virtio_cwrite(vb->vdev, struct virtio_balloon_config,
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poison_val, &poison_val);
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}
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}
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}
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/*
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/*
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* We continue to use VIRTIO_BALLOON_F_DEFLATE_ON_OOM to decide if a
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* We continue to use VIRTIO_BALLOON_F_DEFLATE_ON_OOM to decide if a
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@ -992,6 +998,9 @@ static int virtballoon_restore(struct virtio_device *vdev)
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static int virtballoon_validate(struct virtio_device *vdev)
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static int virtballoon_validate(struct virtio_device *vdev)
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{
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{
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if (!page_poisoning_enabled())
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__virtio_clear_bit(vdev, VIRTIO_BALLOON_F_PAGE_POISON);
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__virtio_clear_bit(vdev, VIRTIO_F_IOMMU_PLATFORM);
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__virtio_clear_bit(vdev, VIRTIO_F_IOMMU_PLATFORM);
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return 0;
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return 0;
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}
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}
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@ -1001,6 +1010,7 @@ static unsigned int features[] = {
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VIRTIO_BALLOON_F_STATS_VQ,
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VIRTIO_BALLOON_F_STATS_VQ,
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VIRTIO_BALLOON_F_DEFLATE_ON_OOM,
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VIRTIO_BALLOON_F_DEFLATE_ON_OOM,
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VIRTIO_BALLOON_F_FREE_PAGE_HINT,
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VIRTIO_BALLOON_F_FREE_PAGE_HINT,
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VIRTIO_BALLOON_F_PAGE_POISON,
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};
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};
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static struct virtio_driver virtio_balloon_driver = {
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static struct virtio_driver virtio_balloon_driver = {
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@ -35,6 +35,7 @@
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#define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory Stats virtqueue */
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#define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory Stats virtqueue */
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#define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */
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#define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */
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#define VIRTIO_BALLOON_F_FREE_PAGE_HINT 3 /* VQ to report free pages */
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#define VIRTIO_BALLOON_F_FREE_PAGE_HINT 3 /* VQ to report free pages */
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#define VIRTIO_BALLOON_F_PAGE_POISON 4 /* Guest is using page poisoning */
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/* Size of a PFN in the balloon interface. */
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/* Size of a PFN in the balloon interface. */
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#define VIRTIO_BALLOON_PFN_SHIFT 12
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#define VIRTIO_BALLOON_PFN_SHIFT 12
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@ -48,6 +49,8 @@ struct virtio_balloon_config {
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__u32 actual;
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__u32 actual;
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/* Free page report command id, readonly by guest */
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/* Free page report command id, readonly by guest */
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__u32 free_page_report_cmd_id;
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__u32 free_page_report_cmd_id;
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/* Stores PAGE_POISON if page poisoning is in use */
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__u32 poison_val;
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};
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};
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#define VIRTIO_BALLOON_S_SWAP_IN 0 /* Amount of memory swapped in */
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#define VIRTIO_BALLOON_S_SWAP_IN 0 /* Amount of memory swapped in */
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