virtio-mem: Factor out traversing unplugged ranges
Let's factor out the core logic, no need to replicate. Reviewed-by: Pankaj Gupta <pankaj.gupta@cloud.ionos.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Alex Williamson <alex.williamson@redhat.com> Cc: Dr. David Alan Gilbert <dgilbert@redhat.com> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Cc: Peter Xu <peterx@redhat.com> Cc: Auger Eric <eric.auger@redhat.com> Cc: Wei Yang <richard.weiyang@linux.alibaba.com> Cc: teawater <teawaterz@linux.alibaba.com> Cc: Marek Kedzierski <mkedzier@redhat.com> Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20210413095531.25603-4-david@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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@ -145,6 +145,33 @@ static bool virtio_mem_is_busy(void)
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return migration_in_incoming_postcopy() || !migration_is_idle();
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}
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typedef int (*virtio_mem_range_cb)(const VirtIOMEM *vmem, void *arg,
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uint64_t offset, uint64_t size);
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static int virtio_mem_for_each_unplugged_range(const VirtIOMEM *vmem, void *arg,
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virtio_mem_range_cb cb)
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{
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unsigned long first_zero_bit, last_zero_bit;
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uint64_t offset, size;
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int ret = 0;
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first_zero_bit = find_first_zero_bit(vmem->bitmap, vmem->bitmap_size);
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while (first_zero_bit < vmem->bitmap_size) {
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offset = first_zero_bit * vmem->block_size;
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last_zero_bit = find_next_bit(vmem->bitmap, vmem->bitmap_size,
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first_zero_bit + 1) - 1;
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size = (last_zero_bit - first_zero_bit + 1) * vmem->block_size;
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ret = cb(vmem, arg, offset, size);
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if (ret) {
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break;
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}
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first_zero_bit = find_next_zero_bit(vmem->bitmap, vmem->bitmap_size,
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last_zero_bit + 2);
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}
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return ret;
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}
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static bool virtio_mem_test_bitmap(VirtIOMEM *vmem, uint64_t start_gpa,
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uint64_t size, bool plugged)
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{
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@ -594,33 +621,27 @@ static void virtio_mem_device_unrealize(DeviceState *dev)
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ram_block_discard_require(false);
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}
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static int virtio_mem_restore_unplugged(VirtIOMEM *vmem)
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static int virtio_mem_discard_range_cb(const VirtIOMEM *vmem, void *arg,
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uint64_t offset, uint64_t size)
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{
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RAMBlock *rb = vmem->memdev->mr.ram_block;
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unsigned long first_zero_bit, last_zero_bit;
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uint64_t offset, length;
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int ret;
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/* Find consecutive unplugged blocks and discard the consecutive range. */
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first_zero_bit = find_first_zero_bit(vmem->bitmap, vmem->bitmap_size);
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while (first_zero_bit < vmem->bitmap_size) {
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offset = first_zero_bit * vmem->block_size;
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last_zero_bit = find_next_bit(vmem->bitmap, vmem->bitmap_size,
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first_zero_bit + 1) - 1;
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length = (last_zero_bit - first_zero_bit + 1) * vmem->block_size;
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ret = ram_block_discard_range(rb, offset, length);
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ret = ram_block_discard_range(rb, offset, size);
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if (ret) {
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error_report("Unexpected error discarding RAM: %s",
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strerror(-ret));
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error_report("Unexpected error discarding RAM: %s", strerror(-ret));
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return -EINVAL;
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}
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first_zero_bit = find_next_zero_bit(vmem->bitmap, vmem->bitmap_size,
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last_zero_bit + 2);
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}
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return 0;
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}
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static int virtio_mem_restore_unplugged(VirtIOMEM *vmem)
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{
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/* Make sure all memory is really discarded after migration. */
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return virtio_mem_for_each_unplugged_range(vmem, NULL,
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virtio_mem_discard_range_cb);
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}
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static int virtio_mem_post_load(void *opaque, int version_id)
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{
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if (migration_in_incoming_postcopy()) {
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@ -872,28 +893,19 @@ static void virtio_mem_set_block_size(Object *obj, Visitor *v, const char *name,
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vmem->block_size = value;
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}
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static void virtio_mem_precopy_exclude_unplugged(VirtIOMEM *vmem)
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static int virtio_mem_precopy_exclude_range_cb(const VirtIOMEM *vmem, void *arg,
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uint64_t offset, uint64_t size)
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{
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void * const host = qemu_ram_get_host_addr(vmem->memdev->mr.ram_block);
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unsigned long first_zero_bit, last_zero_bit;
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uint64_t offset, length;
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/*
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* Find consecutive unplugged blocks and exclude them from migration.
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*
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* Note: Blocks cannot get (un)plugged during precopy, no locking needed.
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*/
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first_zero_bit = find_first_zero_bit(vmem->bitmap, vmem->bitmap_size);
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while (first_zero_bit < vmem->bitmap_size) {
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offset = first_zero_bit * vmem->block_size;
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last_zero_bit = find_next_bit(vmem->bitmap, vmem->bitmap_size,
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first_zero_bit + 1) - 1;
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length = (last_zero_bit - first_zero_bit + 1) * vmem->block_size;
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qemu_guest_free_page_hint(host + offset, size);
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return 0;
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}
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qemu_guest_free_page_hint(host + offset, length);
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first_zero_bit = find_next_zero_bit(vmem->bitmap, vmem->bitmap_size,
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last_zero_bit + 2);
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}
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static void virtio_mem_precopy_exclude_unplugged(VirtIOMEM *vmem)
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{
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virtio_mem_for_each_unplugged_range(vmem, NULL,
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virtio_mem_precopy_exclude_range_cb);
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}
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static int virtio_mem_precopy_notify(NotifierWithReturn *n, void *data)
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