871 lines
29 KiB
C
871 lines
29 KiB
C
/*
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* Virtio MEM device
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*
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* Copyright (C) 2020 Red Hat, Inc.
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*
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* Authors:
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* David Hildenbrand <david@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "qemu/iov.h"
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#include "qemu/cutils.h"
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#include "qemu/error-report.h"
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#include "qemu/units.h"
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#include "sysemu/numa.h"
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#include "sysemu/sysemu.h"
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#include "sysemu/reset.h"
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#include "hw/virtio/virtio.h"
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#include "hw/virtio/virtio-bus.h"
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#include "hw/virtio/virtio-access.h"
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#include "hw/virtio/virtio-mem.h"
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#include "qapi/error.h"
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#include "qapi/visitor.h"
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#include "exec/ram_addr.h"
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#include "migration/misc.h"
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#include "hw/boards.h"
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#include "hw/qdev-properties.h"
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#include "config-devices.h"
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#include "trace.h"
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/*
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* Use QEMU_VMALLOC_ALIGN, so no THP will have to be split when unplugging
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* memory (e.g., 2MB on x86_64).
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*/
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#define VIRTIO_MEM_MIN_BLOCK_SIZE ((uint32_t)QEMU_VMALLOC_ALIGN)
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/*
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* Size the usable region bigger than the requested size if possible. Esp.
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* Linux guests will only add (aligned) memory blocks in case they fully
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* fit into the usable region, but plug+online only a subset of the pages.
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* The memory block size corresponds mostly to the section size.
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*
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* This allows e.g., to add 20MB with a section size of 128MB on x86_64, and
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* a section size of 1GB on arm64 (as long as the start address is properly
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* aligned, similar to ordinary DIMMs).
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*
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* We can change this at any time and maybe even make it configurable if
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* necessary (as the section size can change). But it's more likely that the
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* section size will rather get smaller and not bigger over time.
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*/
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#if defined(TARGET_X86_64) || defined(TARGET_I386)
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#define VIRTIO_MEM_USABLE_EXTENT (2 * (128 * MiB))
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#else
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#error VIRTIO_MEM_USABLE_EXTENT not defined
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#endif
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static bool virtio_mem_is_busy(void)
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{
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/*
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* Postcopy cannot handle concurrent discards and we don't want to migrate
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* pages on-demand with stale content when plugging new blocks.
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*
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* For precopy, we don't want unplugged blocks in our migration stream, and
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* when plugging new blocks, the page content might differ between source
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* and destination (observable by the guest when not initializing pages
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* after plugging them) until we're running on the destination (as we didn't
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* migrate these blocks when they were unplugged).
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*/
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return migration_in_incoming_postcopy() || !migration_is_idle();
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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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const unsigned long first_bit = (start_gpa - vmem->addr) / vmem->block_size;
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const unsigned long last_bit = first_bit + (size / vmem->block_size) - 1;
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unsigned long found_bit;
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/* We fake a shorter bitmap to avoid searching too far. */
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if (plugged) {
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found_bit = find_next_zero_bit(vmem->bitmap, last_bit + 1, first_bit);
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} else {
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found_bit = find_next_bit(vmem->bitmap, last_bit + 1, first_bit);
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}
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return found_bit > last_bit;
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}
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static void virtio_mem_set_bitmap(VirtIOMEM *vmem, uint64_t start_gpa,
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uint64_t size, bool plugged)
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{
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const unsigned long bit = (start_gpa - vmem->addr) / vmem->block_size;
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const unsigned long nbits = size / vmem->block_size;
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if (plugged) {
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bitmap_set(vmem->bitmap, bit, nbits);
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} else {
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bitmap_clear(vmem->bitmap, bit, nbits);
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}
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}
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static void virtio_mem_send_response(VirtIOMEM *vmem, VirtQueueElement *elem,
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struct virtio_mem_resp *resp)
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{
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VirtIODevice *vdev = VIRTIO_DEVICE(vmem);
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VirtQueue *vq = vmem->vq;
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trace_virtio_mem_send_response(le16_to_cpu(resp->type));
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iov_from_buf(elem->in_sg, elem->in_num, 0, resp, sizeof(*resp));
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virtqueue_push(vq, elem, sizeof(*resp));
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virtio_notify(vdev, vq);
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}
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static void virtio_mem_send_response_simple(VirtIOMEM *vmem,
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VirtQueueElement *elem,
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uint16_t type)
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{
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struct virtio_mem_resp resp = {
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.type = cpu_to_le16(type),
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};
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virtio_mem_send_response(vmem, elem, &resp);
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}
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static bool virtio_mem_valid_range(VirtIOMEM *vmem, uint64_t gpa, uint64_t size)
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{
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if (!QEMU_IS_ALIGNED(gpa, vmem->block_size)) {
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return false;
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}
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if (gpa + size < gpa || !size) {
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return false;
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}
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if (gpa < vmem->addr || gpa >= vmem->addr + vmem->usable_region_size) {
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return false;
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}
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if (gpa + size > vmem->addr + vmem->usable_region_size) {
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return false;
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}
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return true;
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}
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static int virtio_mem_set_block_state(VirtIOMEM *vmem, uint64_t start_gpa,
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uint64_t size, bool plug)
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{
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const uint64_t offset = start_gpa - vmem->addr;
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int ret;
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if (virtio_mem_is_busy()) {
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return -EBUSY;
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}
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if (!plug) {
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ret = ram_block_discard_range(vmem->memdev->mr.ram_block, 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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return -EBUSY;
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}
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}
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virtio_mem_set_bitmap(vmem, start_gpa, size, plug);
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return 0;
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}
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static int virtio_mem_state_change_request(VirtIOMEM *vmem, uint64_t gpa,
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uint16_t nb_blocks, bool plug)
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{
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const uint64_t size = nb_blocks * vmem->block_size;
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int ret;
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if (!virtio_mem_valid_range(vmem, gpa, size)) {
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return VIRTIO_MEM_RESP_ERROR;
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}
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if (plug && (vmem->size + size > vmem->requested_size)) {
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return VIRTIO_MEM_RESP_NACK;
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}
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/* test if really all blocks are in the opposite state */
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if (!virtio_mem_test_bitmap(vmem, gpa, size, !plug)) {
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return VIRTIO_MEM_RESP_ERROR;
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}
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ret = virtio_mem_set_block_state(vmem, gpa, size, plug);
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if (ret) {
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return VIRTIO_MEM_RESP_BUSY;
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}
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if (plug) {
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vmem->size += size;
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} else {
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vmem->size -= size;
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}
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notifier_list_notify(&vmem->size_change_notifiers, &vmem->size);
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return VIRTIO_MEM_RESP_ACK;
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}
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static void virtio_mem_plug_request(VirtIOMEM *vmem, VirtQueueElement *elem,
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struct virtio_mem_req *req)
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{
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const uint64_t gpa = le64_to_cpu(req->u.plug.addr);
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const uint16_t nb_blocks = le16_to_cpu(req->u.plug.nb_blocks);
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uint16_t type;
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trace_virtio_mem_plug_request(gpa, nb_blocks);
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type = virtio_mem_state_change_request(vmem, gpa, nb_blocks, true);
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virtio_mem_send_response_simple(vmem, elem, type);
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}
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static void virtio_mem_unplug_request(VirtIOMEM *vmem, VirtQueueElement *elem,
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struct virtio_mem_req *req)
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{
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const uint64_t gpa = le64_to_cpu(req->u.unplug.addr);
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const uint16_t nb_blocks = le16_to_cpu(req->u.unplug.nb_blocks);
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uint16_t type;
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trace_virtio_mem_unplug_request(gpa, nb_blocks);
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type = virtio_mem_state_change_request(vmem, gpa, nb_blocks, false);
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virtio_mem_send_response_simple(vmem, elem, type);
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}
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static void virtio_mem_resize_usable_region(VirtIOMEM *vmem,
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uint64_t requested_size,
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bool can_shrink)
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{
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uint64_t newsize = MIN(memory_region_size(&vmem->memdev->mr),
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requested_size + VIRTIO_MEM_USABLE_EXTENT);
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if (!requested_size) {
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newsize = 0;
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}
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if (newsize < vmem->usable_region_size && !can_shrink) {
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return;
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}
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trace_virtio_mem_resized_usable_region(vmem->usable_region_size, newsize);
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vmem->usable_region_size = newsize;
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}
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static int virtio_mem_unplug_all(VirtIOMEM *vmem)
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{
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RAMBlock *rb = vmem->memdev->mr.ram_block;
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int ret;
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if (virtio_mem_is_busy()) {
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return -EBUSY;
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}
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ret = ram_block_discard_range(rb, 0, qemu_ram_get_used_length(rb));
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if (ret) {
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error_report("Unexpected error discarding RAM: %s", strerror(-ret));
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return -EBUSY;
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}
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bitmap_clear(vmem->bitmap, 0, vmem->bitmap_size);
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if (vmem->size) {
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vmem->size = 0;
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notifier_list_notify(&vmem->size_change_notifiers, &vmem->size);
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}
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trace_virtio_mem_unplugged_all();
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virtio_mem_resize_usable_region(vmem, vmem->requested_size, true);
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return 0;
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}
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static void virtio_mem_unplug_all_request(VirtIOMEM *vmem,
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VirtQueueElement *elem)
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{
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trace_virtio_mem_unplug_all_request();
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if (virtio_mem_unplug_all(vmem)) {
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virtio_mem_send_response_simple(vmem, elem, VIRTIO_MEM_RESP_BUSY);
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} else {
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virtio_mem_send_response_simple(vmem, elem, VIRTIO_MEM_RESP_ACK);
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}
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}
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static void virtio_mem_state_request(VirtIOMEM *vmem, VirtQueueElement *elem,
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struct virtio_mem_req *req)
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{
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const uint16_t nb_blocks = le16_to_cpu(req->u.state.nb_blocks);
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const uint64_t gpa = le64_to_cpu(req->u.state.addr);
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const uint64_t size = nb_blocks * vmem->block_size;
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struct virtio_mem_resp resp = {
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.type = cpu_to_le16(VIRTIO_MEM_RESP_ACK),
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};
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trace_virtio_mem_state_request(gpa, nb_blocks);
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if (!virtio_mem_valid_range(vmem, gpa, size)) {
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virtio_mem_send_response_simple(vmem, elem, VIRTIO_MEM_RESP_ERROR);
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return;
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}
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if (virtio_mem_test_bitmap(vmem, gpa, size, true)) {
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resp.u.state.state = cpu_to_le16(VIRTIO_MEM_STATE_PLUGGED);
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} else if (virtio_mem_test_bitmap(vmem, gpa, size, false)) {
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resp.u.state.state = cpu_to_le16(VIRTIO_MEM_STATE_UNPLUGGED);
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} else {
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resp.u.state.state = cpu_to_le16(VIRTIO_MEM_STATE_MIXED);
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}
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trace_virtio_mem_state_response(le16_to_cpu(resp.u.state.state));
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virtio_mem_send_response(vmem, elem, &resp);
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}
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static void virtio_mem_handle_request(VirtIODevice *vdev, VirtQueue *vq)
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{
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const int len = sizeof(struct virtio_mem_req);
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VirtIOMEM *vmem = VIRTIO_MEM(vdev);
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VirtQueueElement *elem;
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struct virtio_mem_req req;
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uint16_t type;
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while (true) {
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elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
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if (!elem) {
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return;
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}
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if (iov_to_buf(elem->out_sg, elem->out_num, 0, &req, len) < len) {
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virtio_error(vdev, "virtio-mem protocol violation: invalid request"
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" size: %d", len);
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g_free(elem);
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return;
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}
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if (iov_size(elem->in_sg, elem->in_num) <
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sizeof(struct virtio_mem_resp)) {
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virtio_error(vdev, "virtio-mem protocol violation: not enough space"
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" for response: %zu",
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iov_size(elem->in_sg, elem->in_num));
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g_free(elem);
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return;
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}
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type = le16_to_cpu(req.type);
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switch (type) {
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case VIRTIO_MEM_REQ_PLUG:
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virtio_mem_plug_request(vmem, elem, &req);
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break;
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case VIRTIO_MEM_REQ_UNPLUG:
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virtio_mem_unplug_request(vmem, elem, &req);
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break;
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case VIRTIO_MEM_REQ_UNPLUG_ALL:
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virtio_mem_unplug_all_request(vmem, elem);
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break;
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case VIRTIO_MEM_REQ_STATE:
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virtio_mem_state_request(vmem, elem, &req);
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break;
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default:
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virtio_error(vdev, "virtio-mem protocol violation: unknown request"
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" type: %d", type);
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g_free(elem);
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return;
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}
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g_free(elem);
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}
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}
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static void virtio_mem_get_config(VirtIODevice *vdev, uint8_t *config_data)
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{
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VirtIOMEM *vmem = VIRTIO_MEM(vdev);
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struct virtio_mem_config *config = (void *) config_data;
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config->block_size = cpu_to_le64(vmem->block_size);
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config->node_id = cpu_to_le16(vmem->node);
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config->requested_size = cpu_to_le64(vmem->requested_size);
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config->plugged_size = cpu_to_le64(vmem->size);
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config->addr = cpu_to_le64(vmem->addr);
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config->region_size = cpu_to_le64(memory_region_size(&vmem->memdev->mr));
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config->usable_region_size = cpu_to_le64(vmem->usable_region_size);
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}
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static uint64_t virtio_mem_get_features(VirtIODevice *vdev, uint64_t features,
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Error **errp)
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{
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MachineState *ms = MACHINE(qdev_get_machine());
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if (ms->numa_state) {
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#if defined(CONFIG_ACPI)
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virtio_add_feature(&features, VIRTIO_MEM_F_ACPI_PXM);
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#endif
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}
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return features;
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}
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static void virtio_mem_system_reset(void *opaque)
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{
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VirtIOMEM *vmem = VIRTIO_MEM(opaque);
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/*
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* During usual resets, we will unplug all memory and shrink the usable
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* region size. This is, however, not possible in all scenarios. Then,
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* the guest has to deal with this manually (VIRTIO_MEM_REQ_UNPLUG_ALL).
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*/
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virtio_mem_unplug_all(vmem);
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}
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static void virtio_mem_device_realize(DeviceState *dev, Error **errp)
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{
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MachineState *ms = MACHINE(qdev_get_machine());
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int nb_numa_nodes = ms->numa_state ? ms->numa_state->num_nodes : 0;
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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VirtIOMEM *vmem = VIRTIO_MEM(dev);
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uint64_t page_size;
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RAMBlock *rb;
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int ret;
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if (!vmem->memdev) {
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error_setg(errp, "'%s' property is not set", VIRTIO_MEM_MEMDEV_PROP);
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return;
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} else if (host_memory_backend_is_mapped(vmem->memdev)) {
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error_setg(errp, "'%s' property specifies a busy memdev: %s",
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VIRTIO_MEM_MEMDEV_PROP,
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object_get_canonical_path_component(OBJECT(vmem->memdev)));
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return;
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} else if (!memory_region_is_ram(&vmem->memdev->mr) ||
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memory_region_is_rom(&vmem->memdev->mr) ||
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!vmem->memdev->mr.ram_block) {
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error_setg(errp, "'%s' property specifies an unsupported memdev",
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VIRTIO_MEM_MEMDEV_PROP);
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return;
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}
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if ((nb_numa_nodes && vmem->node >= nb_numa_nodes) ||
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(!nb_numa_nodes && vmem->node)) {
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error_setg(errp, "'%s' property has value '%" PRIu32 "', which exceeds"
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"the number of numa nodes: %d", VIRTIO_MEM_NODE_PROP,
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vmem->node, nb_numa_nodes ? nb_numa_nodes : 1);
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return;
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}
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if (enable_mlock) {
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error_setg(errp, "Incompatible with mlock");
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return;
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}
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rb = vmem->memdev->mr.ram_block;
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page_size = qemu_ram_pagesize(rb);
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if (vmem->block_size < page_size) {
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error_setg(errp, "'%s' property has to be at least the page size (0x%"
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PRIx64 ")", VIRTIO_MEM_BLOCK_SIZE_PROP, page_size);
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return;
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} else if (!QEMU_IS_ALIGNED(vmem->requested_size, vmem->block_size)) {
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error_setg(errp, "'%s' property has to be multiples of '%s' (0x%" PRIx64
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")", VIRTIO_MEM_REQUESTED_SIZE_PROP,
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VIRTIO_MEM_BLOCK_SIZE_PROP, vmem->block_size);
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return;
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} else if (!QEMU_IS_ALIGNED(memory_region_size(&vmem->memdev->mr),
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vmem->block_size)) {
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error_setg(errp, "'%s' property memdev size has to be multiples of"
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"'%s' (0x%" PRIx64 ")", VIRTIO_MEM_MEMDEV_PROP,
|
|
VIRTIO_MEM_BLOCK_SIZE_PROP, vmem->block_size);
|
|
return;
|
|
}
|
|
|
|
if (ram_block_discard_require(true)) {
|
|
error_setg(errp, "Discarding RAM is disabled");
|
|
return;
|
|
}
|
|
|
|
ret = ram_block_discard_range(rb, 0, qemu_ram_get_used_length(rb));
|
|
if (ret) {
|
|
error_setg_errno(errp, -ret, "Unexpected error discarding RAM");
|
|
ram_block_discard_require(false);
|
|
return;
|
|
}
|
|
|
|
virtio_mem_resize_usable_region(vmem, vmem->requested_size, true);
|
|
|
|
vmem->bitmap_size = memory_region_size(&vmem->memdev->mr) /
|
|
vmem->block_size;
|
|
vmem->bitmap = bitmap_new(vmem->bitmap_size);
|
|
|
|
virtio_init(vdev, TYPE_VIRTIO_MEM, VIRTIO_ID_MEM,
|
|
sizeof(struct virtio_mem_config));
|
|
vmem->vq = virtio_add_queue(vdev, 128, virtio_mem_handle_request);
|
|
|
|
host_memory_backend_set_mapped(vmem->memdev, true);
|
|
vmstate_register_ram(&vmem->memdev->mr, DEVICE(vmem));
|
|
qemu_register_reset(virtio_mem_system_reset, vmem);
|
|
precopy_add_notifier(&vmem->precopy_notifier);
|
|
}
|
|
|
|
static void virtio_mem_device_unrealize(DeviceState *dev)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VirtIOMEM *vmem = VIRTIO_MEM(dev);
|
|
|
|
precopy_remove_notifier(&vmem->precopy_notifier);
|
|
qemu_unregister_reset(virtio_mem_system_reset, vmem);
|
|
vmstate_unregister_ram(&vmem->memdev->mr, DEVICE(vmem));
|
|
host_memory_backend_set_mapped(vmem->memdev, false);
|
|
virtio_del_queue(vdev, 0);
|
|
virtio_cleanup(vdev);
|
|
g_free(vmem->bitmap);
|
|
ram_block_discard_require(false);
|
|
}
|
|
|
|
static int virtio_mem_restore_unplugged(VirtIOMEM *vmem)
|
|
{
|
|
RAMBlock *rb = vmem->memdev->mr.ram_block;
|
|
unsigned long first_zero_bit, last_zero_bit;
|
|
uint64_t offset, length;
|
|
int ret;
|
|
|
|
/* Find consecutive unplugged blocks and discard the consecutive range. */
|
|
first_zero_bit = find_first_zero_bit(vmem->bitmap, vmem->bitmap_size);
|
|
while (first_zero_bit < vmem->bitmap_size) {
|
|
offset = first_zero_bit * vmem->block_size;
|
|
last_zero_bit = find_next_bit(vmem->bitmap, vmem->bitmap_size,
|
|
first_zero_bit + 1) - 1;
|
|
length = (last_zero_bit - first_zero_bit + 1) * vmem->block_size;
|
|
|
|
ret = ram_block_discard_range(rb, offset, length);
|
|
if (ret) {
|
|
error_report("Unexpected error discarding RAM: %s",
|
|
strerror(-ret));
|
|
return -EINVAL;
|
|
}
|
|
first_zero_bit = find_next_zero_bit(vmem->bitmap, vmem->bitmap_size,
|
|
last_zero_bit + 2);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int virtio_mem_post_load(void *opaque, int version_id)
|
|
{
|
|
if (migration_in_incoming_postcopy()) {
|
|
return 0;
|
|
}
|
|
|
|
return virtio_mem_restore_unplugged(VIRTIO_MEM(opaque));
|
|
}
|
|
|
|
typedef struct VirtIOMEMMigSanityChecks {
|
|
VirtIOMEM *parent;
|
|
uint64_t addr;
|
|
uint64_t region_size;
|
|
uint64_t block_size;
|
|
uint32_t node;
|
|
} VirtIOMEMMigSanityChecks;
|
|
|
|
static int virtio_mem_mig_sanity_checks_pre_save(void *opaque)
|
|
{
|
|
VirtIOMEMMigSanityChecks *tmp = opaque;
|
|
VirtIOMEM *vmem = tmp->parent;
|
|
|
|
tmp->addr = vmem->addr;
|
|
tmp->region_size = memory_region_size(&vmem->memdev->mr);
|
|
tmp->block_size = vmem->block_size;
|
|
tmp->node = vmem->node;
|
|
return 0;
|
|
}
|
|
|
|
static int virtio_mem_mig_sanity_checks_post_load(void *opaque, int version_id)
|
|
{
|
|
VirtIOMEMMigSanityChecks *tmp = opaque;
|
|
VirtIOMEM *vmem = tmp->parent;
|
|
const uint64_t new_region_size = memory_region_size(&vmem->memdev->mr);
|
|
|
|
if (tmp->addr != vmem->addr) {
|
|
error_report("Property '%s' changed from 0x%" PRIx64 " to 0x%" PRIx64,
|
|
VIRTIO_MEM_ADDR_PROP, tmp->addr, vmem->addr);
|
|
return -EINVAL;
|
|
}
|
|
/*
|
|
* Note: Preparation for resizeable memory regions. The maximum size
|
|
* of the memory region must not change during migration.
|
|
*/
|
|
if (tmp->region_size != new_region_size) {
|
|
error_report("Property '%s' size changed from 0x%" PRIx64 " to 0x%"
|
|
PRIx64, VIRTIO_MEM_MEMDEV_PROP, tmp->region_size,
|
|
new_region_size);
|
|
return -EINVAL;
|
|
}
|
|
if (tmp->block_size != vmem->block_size) {
|
|
error_report("Property '%s' changed from 0x%" PRIx64 " to 0x%" PRIx64,
|
|
VIRTIO_MEM_BLOCK_SIZE_PROP, tmp->block_size,
|
|
vmem->block_size);
|
|
return -EINVAL;
|
|
}
|
|
if (tmp->node != vmem->node) {
|
|
error_report("Property '%s' changed from %" PRIu32 " to %" PRIu32,
|
|
VIRTIO_MEM_NODE_PROP, tmp->node, vmem->node);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const VMStateDescription vmstate_virtio_mem_sanity_checks = {
|
|
.name = "virtio-mem-device/sanity-checks",
|
|
.pre_save = virtio_mem_mig_sanity_checks_pre_save,
|
|
.post_load = virtio_mem_mig_sanity_checks_post_load,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT64(addr, VirtIOMEMMigSanityChecks),
|
|
VMSTATE_UINT64(region_size, VirtIOMEMMigSanityChecks),
|
|
VMSTATE_UINT64(block_size, VirtIOMEMMigSanityChecks),
|
|
VMSTATE_UINT32(node, VirtIOMEMMigSanityChecks),
|
|
VMSTATE_END_OF_LIST(),
|
|
},
|
|
};
|
|
|
|
static const VMStateDescription vmstate_virtio_mem_device = {
|
|
.name = "virtio-mem-device",
|
|
.minimum_version_id = 1,
|
|
.version_id = 1,
|
|
.post_load = virtio_mem_post_load,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_WITH_TMP(VirtIOMEM, VirtIOMEMMigSanityChecks,
|
|
vmstate_virtio_mem_sanity_checks),
|
|
VMSTATE_UINT64(usable_region_size, VirtIOMEM),
|
|
VMSTATE_UINT64(size, VirtIOMEM),
|
|
VMSTATE_UINT64(requested_size, VirtIOMEM),
|
|
VMSTATE_BITMAP(bitmap, VirtIOMEM, 0, bitmap_size),
|
|
VMSTATE_END_OF_LIST()
|
|
},
|
|
};
|
|
|
|
static const VMStateDescription vmstate_virtio_mem = {
|
|
.name = "virtio-mem",
|
|
.minimum_version_id = 1,
|
|
.version_id = 1,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_VIRTIO_DEVICE,
|
|
VMSTATE_END_OF_LIST()
|
|
},
|
|
};
|
|
|
|
static void virtio_mem_fill_device_info(const VirtIOMEM *vmem,
|
|
VirtioMEMDeviceInfo *vi)
|
|
{
|
|
vi->memaddr = vmem->addr;
|
|
vi->node = vmem->node;
|
|
vi->requested_size = vmem->requested_size;
|
|
vi->size = vmem->size;
|
|
vi->max_size = memory_region_size(&vmem->memdev->mr);
|
|
vi->block_size = vmem->block_size;
|
|
vi->memdev = object_get_canonical_path(OBJECT(vmem->memdev));
|
|
}
|
|
|
|
static MemoryRegion *virtio_mem_get_memory_region(VirtIOMEM *vmem, Error **errp)
|
|
{
|
|
if (!vmem->memdev) {
|
|
error_setg(errp, "'%s' property must be set", VIRTIO_MEM_MEMDEV_PROP);
|
|
return NULL;
|
|
}
|
|
|
|
return &vmem->memdev->mr;
|
|
}
|
|
|
|
static void virtio_mem_add_size_change_notifier(VirtIOMEM *vmem,
|
|
Notifier *notifier)
|
|
{
|
|
notifier_list_add(&vmem->size_change_notifiers, notifier);
|
|
}
|
|
|
|
static void virtio_mem_remove_size_change_notifier(VirtIOMEM *vmem,
|
|
Notifier *notifier)
|
|
{
|
|
notifier_remove(notifier);
|
|
}
|
|
|
|
static void virtio_mem_get_size(Object *obj, Visitor *v, const char *name,
|
|
void *opaque, Error **errp)
|
|
{
|
|
const VirtIOMEM *vmem = VIRTIO_MEM(obj);
|
|
uint64_t value = vmem->size;
|
|
|
|
visit_type_size(v, name, &value, errp);
|
|
}
|
|
|
|
static void virtio_mem_get_requested_size(Object *obj, Visitor *v,
|
|
const char *name, void *opaque,
|
|
Error **errp)
|
|
{
|
|
const VirtIOMEM *vmem = VIRTIO_MEM(obj);
|
|
uint64_t value = vmem->requested_size;
|
|
|
|
visit_type_size(v, name, &value, errp);
|
|
}
|
|
|
|
static void virtio_mem_set_requested_size(Object *obj, Visitor *v,
|
|
const char *name, void *opaque,
|
|
Error **errp)
|
|
{
|
|
VirtIOMEM *vmem = VIRTIO_MEM(obj);
|
|
Error *err = NULL;
|
|
uint64_t value;
|
|
|
|
visit_type_size(v, name, &value, &err);
|
|
if (err) {
|
|
error_propagate(errp, err);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* The block size and memory backend are not fixed until the device was
|
|
* realized. realize() will verify these properties then.
|
|
*/
|
|
if (DEVICE(obj)->realized) {
|
|
if (!QEMU_IS_ALIGNED(value, vmem->block_size)) {
|
|
error_setg(errp, "'%s' has to be multiples of '%s' (0x%" PRIx64
|
|
")", name, VIRTIO_MEM_BLOCK_SIZE_PROP,
|
|
vmem->block_size);
|
|
return;
|
|
} else if (value > memory_region_size(&vmem->memdev->mr)) {
|
|
error_setg(errp, "'%s' cannot exceed the memory backend size"
|
|
"(0x%" PRIx64 ")", name,
|
|
memory_region_size(&vmem->memdev->mr));
|
|
return;
|
|
}
|
|
|
|
if (value != vmem->requested_size) {
|
|
virtio_mem_resize_usable_region(vmem, value, false);
|
|
vmem->requested_size = value;
|
|
}
|
|
/*
|
|
* Trigger a config update so the guest gets notified. We trigger
|
|
* even if the size didn't change (especially helpful for debugging).
|
|
*/
|
|
virtio_notify_config(VIRTIO_DEVICE(vmem));
|
|
} else {
|
|
vmem->requested_size = value;
|
|
}
|
|
}
|
|
|
|
static void virtio_mem_get_block_size(Object *obj, Visitor *v, const char *name,
|
|
void *opaque, Error **errp)
|
|
{
|
|
const VirtIOMEM *vmem = VIRTIO_MEM(obj);
|
|
uint64_t value = vmem->block_size;
|
|
|
|
visit_type_size(v, name, &value, errp);
|
|
}
|
|
|
|
static void virtio_mem_set_block_size(Object *obj, Visitor *v, const char *name,
|
|
void *opaque, Error **errp)
|
|
{
|
|
VirtIOMEM *vmem = VIRTIO_MEM(obj);
|
|
Error *err = NULL;
|
|
uint64_t value;
|
|
|
|
if (DEVICE(obj)->realized) {
|
|
error_setg(errp, "'%s' cannot be changed", name);
|
|
return;
|
|
}
|
|
|
|
visit_type_size(v, name, &value, &err);
|
|
if (err) {
|
|
error_propagate(errp, err);
|
|
return;
|
|
}
|
|
|
|
if (value < VIRTIO_MEM_MIN_BLOCK_SIZE) {
|
|
error_setg(errp, "'%s' property has to be at least 0x%" PRIx32, name,
|
|
VIRTIO_MEM_MIN_BLOCK_SIZE);
|
|
return;
|
|
} else if (!is_power_of_2(value)) {
|
|
error_setg(errp, "'%s' property has to be a power of two", name);
|
|
return;
|
|
}
|
|
vmem->block_size = value;
|
|
}
|
|
|
|
static void virtio_mem_precopy_exclude_unplugged(VirtIOMEM *vmem)
|
|
{
|
|
void * const host = qemu_ram_get_host_addr(vmem->memdev->mr.ram_block);
|
|
unsigned long first_zero_bit, last_zero_bit;
|
|
uint64_t offset, length;
|
|
|
|
/*
|
|
* Find consecutive unplugged blocks and exclude them from migration.
|
|
*
|
|
* Note: Blocks cannot get (un)plugged during precopy, no locking needed.
|
|
*/
|
|
first_zero_bit = find_first_zero_bit(vmem->bitmap, vmem->bitmap_size);
|
|
while (first_zero_bit < vmem->bitmap_size) {
|
|
offset = first_zero_bit * vmem->block_size;
|
|
last_zero_bit = find_next_bit(vmem->bitmap, vmem->bitmap_size,
|
|
first_zero_bit + 1) - 1;
|
|
length = (last_zero_bit - first_zero_bit + 1) * vmem->block_size;
|
|
|
|
qemu_guest_free_page_hint(host + offset, length);
|
|
first_zero_bit = find_next_zero_bit(vmem->bitmap, vmem->bitmap_size,
|
|
last_zero_bit + 2);
|
|
}
|
|
}
|
|
|
|
static int virtio_mem_precopy_notify(NotifierWithReturn *n, void *data)
|
|
{
|
|
VirtIOMEM *vmem = container_of(n, VirtIOMEM, precopy_notifier);
|
|
PrecopyNotifyData *pnd = data;
|
|
|
|
switch (pnd->reason) {
|
|
case PRECOPY_NOTIFY_SETUP:
|
|
precopy_enable_free_page_optimization();
|
|
break;
|
|
case PRECOPY_NOTIFY_AFTER_BITMAP_SYNC:
|
|
virtio_mem_precopy_exclude_unplugged(vmem);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void virtio_mem_instance_init(Object *obj)
|
|
{
|
|
VirtIOMEM *vmem = VIRTIO_MEM(obj);
|
|
|
|
vmem->block_size = VIRTIO_MEM_MIN_BLOCK_SIZE;
|
|
notifier_list_init(&vmem->size_change_notifiers);
|
|
vmem->precopy_notifier.notify = virtio_mem_precopy_notify;
|
|
|
|
object_property_add(obj, VIRTIO_MEM_SIZE_PROP, "size", virtio_mem_get_size,
|
|
NULL, NULL, NULL);
|
|
object_property_add(obj, VIRTIO_MEM_REQUESTED_SIZE_PROP, "size",
|
|
virtio_mem_get_requested_size,
|
|
virtio_mem_set_requested_size, NULL, NULL);
|
|
object_property_add(obj, VIRTIO_MEM_BLOCK_SIZE_PROP, "size",
|
|
virtio_mem_get_block_size, virtio_mem_set_block_size,
|
|
NULL, NULL);
|
|
}
|
|
|
|
static Property virtio_mem_properties[] = {
|
|
DEFINE_PROP_UINT64(VIRTIO_MEM_ADDR_PROP, VirtIOMEM, addr, 0),
|
|
DEFINE_PROP_UINT32(VIRTIO_MEM_NODE_PROP, VirtIOMEM, node, 0),
|
|
DEFINE_PROP_LINK(VIRTIO_MEM_MEMDEV_PROP, VirtIOMEM, memdev,
|
|
TYPE_MEMORY_BACKEND, HostMemoryBackend *),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static void virtio_mem_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
|
|
VirtIOMEMClass *vmc = VIRTIO_MEM_CLASS(klass);
|
|
|
|
device_class_set_props(dc, virtio_mem_properties);
|
|
dc->vmsd = &vmstate_virtio_mem;
|
|
|
|
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
|
|
vdc->realize = virtio_mem_device_realize;
|
|
vdc->unrealize = virtio_mem_device_unrealize;
|
|
vdc->get_config = virtio_mem_get_config;
|
|
vdc->get_features = virtio_mem_get_features;
|
|
vdc->vmsd = &vmstate_virtio_mem_device;
|
|
|
|
vmc->fill_device_info = virtio_mem_fill_device_info;
|
|
vmc->get_memory_region = virtio_mem_get_memory_region;
|
|
vmc->add_size_change_notifier = virtio_mem_add_size_change_notifier;
|
|
vmc->remove_size_change_notifier = virtio_mem_remove_size_change_notifier;
|
|
}
|
|
|
|
static const TypeInfo virtio_mem_info = {
|
|
.name = TYPE_VIRTIO_MEM,
|
|
.parent = TYPE_VIRTIO_DEVICE,
|
|
.instance_size = sizeof(VirtIOMEM),
|
|
.instance_init = virtio_mem_instance_init,
|
|
.class_init = virtio_mem_class_init,
|
|
.class_size = sizeof(VirtIOMEMClass),
|
|
};
|
|
|
|
static void virtio_register_types(void)
|
|
{
|
|
type_register_static(&virtio_mem_info);
|
|
}
|
|
|
|
type_init(virtio_register_types)
|