diff options
Diffstat (limited to 'hw/virtio/virtio-mem.c')
| -rw-r--r-- | hw/virtio/virtio-mem.c | 873 |
1 files changed, 873 insertions, 0 deletions
diff --git a/hw/virtio/virtio-mem.c b/hw/virtio/virtio-mem.c new file mode 100644 index 0000000000..65850530e7 --- /dev/null +++ b/hw/virtio/virtio-mem.c @@ -0,0 +1,873 @@ +/* + * Virtio MEM device + * + * Copyright (C) 2020 Red Hat, Inc. + * + * Authors: + * David Hildenbrand <david@redhat.com> + * + * This work is licensed under the terms of the GNU GPL, version 2. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "qemu-common.h" +#include "qemu/iov.h" +#include "qemu/cutils.h" +#include "qemu/error-report.h" +#include "qemu/units.h" +#include "sysemu/numa.h" +#include "sysemu/sysemu.h" +#include "sysemu/reset.h" +#include "hw/virtio/virtio.h" +#include "hw/virtio/virtio-bus.h" +#include "hw/virtio/virtio-access.h" +#include "hw/virtio/virtio-mem.h" +#include "qapi/error.h" +#include "qapi/visitor.h" +#include "exec/ram_addr.h" +#include "migration/misc.h" +#include "hw/boards.h" +#include "hw/qdev-properties.h" +#include "config-devices.h" +#include "trace.h" + +/* + * Use QEMU_VMALLOC_ALIGN, so no THP will have to be split when unplugging + * memory (e.g., 2MB on x86_64). + */ +#define VIRTIO_MEM_MIN_BLOCK_SIZE QEMU_VMALLOC_ALIGN +/* + * Size the usable region bigger than the requested size if possible. Esp. + * Linux guests will only add (aligned) memory blocks in case they fully + * fit into the usable region, but plug+online only a subset of the pages. + * The memory block size corresponds mostly to the section size. + * + * This allows e.g., to add 20MB with a section size of 128MB on x86_64, and + * a section size of 1GB on arm64 (as long as the start address is properly + * aligned, similar to ordinary DIMMs). + * + * We can change this at any time and maybe even make it configurable if + * necessary (as the section size can change). But it's more likely that the + * section size will rather get smaller and not bigger over time. + */ +#if defined(TARGET_X86_64) || defined(TARGET_I386) +#define VIRTIO_MEM_USABLE_EXTENT (2 * (128 * MiB)) +#else +#error VIRTIO_MEM_USABLE_EXTENT not defined +#endif + +static bool virtio_mem_is_busy(void) +{ + /* + * Postcopy cannot handle concurrent discards and we don't want to migrate + * pages on-demand with stale content when plugging new blocks. + * + * For precopy, we don't want unplugged blocks in our migration stream, and + * when plugging new blocks, the page content might differ between source + * and destination (observable by the guest when not initializing pages + * after plugging them) until we're running on the destination (as we didn't + * migrate these blocks when they were unplugged). + */ + return migration_in_incoming_postcopy() || !migration_is_idle(); +} + +static bool virtio_mem_test_bitmap(VirtIOMEM *vmem, uint64_t start_gpa, + uint64_t size, bool plugged) +{ + const unsigned long first_bit = (start_gpa - vmem->addr) / vmem->block_size; + const unsigned long last_bit = first_bit + (size / vmem->block_size) - 1; + unsigned long found_bit; + + /* We fake a shorter bitmap to avoid searching too far. */ + if (plugged) { + found_bit = find_next_zero_bit(vmem->bitmap, last_bit + 1, first_bit); + } else { + found_bit = find_next_bit(vmem->bitmap, last_bit + 1, first_bit); + } + return found_bit > last_bit; +} + +static void virtio_mem_set_bitmap(VirtIOMEM *vmem, uint64_t start_gpa, + uint64_t size, bool plugged) +{ + const unsigned long bit = (start_gpa - vmem->addr) / vmem->block_size; + const unsigned long nbits = size / vmem->block_size; + + if (plugged) { + bitmap_set(vmem->bitmap, bit, nbits); + } else { + bitmap_clear(vmem->bitmap, bit, nbits); + } +} + +static void virtio_mem_send_response(VirtIOMEM *vmem, VirtQueueElement *elem, + struct virtio_mem_resp *resp) +{ + VirtIODevice *vdev = VIRTIO_DEVICE(vmem); + VirtQueue *vq = vmem->vq; + + trace_virtio_mem_send_response(le16_to_cpu(resp->type)); + iov_from_buf(elem->in_sg, elem->in_num, 0, resp, sizeof(*resp)); + + virtqueue_push(vq, elem, sizeof(*resp)); + virtio_notify(vdev, vq); +} + +static void virtio_mem_send_response_simple(VirtIOMEM *vmem, + VirtQueueElement *elem, + uint16_t type) +{ + struct virtio_mem_resp resp = { + .type = cpu_to_le16(type), + }; + + virtio_mem_send_response(vmem, elem, &resp); +} + +static bool virtio_mem_valid_range(VirtIOMEM *vmem, uint64_t gpa, uint64_t size) +{ + if (!QEMU_IS_ALIGNED(gpa, vmem->block_size)) { + return false; + } + if (gpa + size < gpa || !size) { + return false; + } + if (gpa < vmem->addr || gpa >= vmem->addr + vmem->usable_region_size) { + return false; + } + if (gpa + size > vmem->addr + vmem->usable_region_size) { + return false; + } + return true; +} + +static int virtio_mem_set_block_state(VirtIOMEM *vmem, uint64_t start_gpa, + uint64_t size, bool plug) +{ + const uint64_t offset = start_gpa - vmem->addr; + int ret; + + if (virtio_mem_is_busy()) { + return -EBUSY; + } + + if (!plug) { + ret = ram_block_discard_range(vmem->memdev->mr.ram_block, offset, size); + if (ret) { + error_report("Unexpected error discarding RAM: %s", + strerror(-ret)); + return -EBUSY; + } + } + virtio_mem_set_bitmap(vmem, start_gpa, size, plug); + return 0; +} + +static int virtio_mem_state_change_request(VirtIOMEM *vmem, uint64_t gpa, + uint16_t nb_blocks, bool plug) +{ + const uint64_t size = nb_blocks * vmem->block_size; + int ret; + + if (!virtio_mem_valid_range(vmem, gpa, size)) { + return VIRTIO_MEM_RESP_ERROR; + } + + if (plug && (vmem->size + size > vmem->requested_size)) { + return VIRTIO_MEM_RESP_NACK; + } + + /* test if really all blocks are in the opposite state */ + if (!virtio_mem_test_bitmap(vmem, gpa, size, !plug)) { + return VIRTIO_MEM_RESP_ERROR; + } + + ret = virtio_mem_set_block_state(vmem, gpa, size, plug); + if (ret) { + return VIRTIO_MEM_RESP_BUSY; + } + if (plug) { + vmem->size += size; + } else { + vmem->size -= size; + } + notifier_list_notify(&vmem->size_change_notifiers, &vmem->size); + return VIRTIO_MEM_RESP_ACK; +} + +static void virtio_mem_plug_request(VirtIOMEM *vmem, VirtQueueElement *elem, + struct virtio_mem_req *req) +{ + const uint64_t gpa = le64_to_cpu(req->u.plug.addr); + const uint16_t nb_blocks = le16_to_cpu(req->u.plug.nb_blocks); + uint16_t type; + + trace_virtio_mem_plug_request(gpa, nb_blocks); + type = virtio_mem_state_change_request(vmem, gpa, nb_blocks, true); + virtio_mem_send_response_simple(vmem, elem, type); +} + +static void virtio_mem_unplug_request(VirtIOMEM *vmem, VirtQueueElement *elem, + struct virtio_mem_req *req) +{ + const uint64_t gpa = le64_to_cpu(req->u.unplug.addr); + const uint16_t nb_blocks = le16_to_cpu(req->u.unplug.nb_blocks); + uint16_t type; + + trace_virtio_mem_unplug_request(gpa, nb_blocks); + type = virtio_mem_state_change_request(vmem, gpa, nb_blocks, false); + virtio_mem_send_response_simple(vmem, elem, type); +} + +static void virtio_mem_resize_usable_region(VirtIOMEM *vmem, + uint64_t requested_size, + bool can_shrink) +{ + uint64_t newsize = MIN(memory_region_size(&vmem->memdev->mr), + requested_size + VIRTIO_MEM_USABLE_EXTENT); + + if (!requested_size) { + newsize = 0; + } + + if (newsize < vmem->usable_region_size && !can_shrink) { + return; + } + + trace_virtio_mem_resized_usable_region(vmem->usable_region_size, newsize); + vmem->usable_region_size = newsize; +} + +static int virtio_mem_unplug_all(VirtIOMEM *vmem) +{ + RAMBlock *rb = vmem->memdev->mr.ram_block; + int ret; + + if (virtio_mem_is_busy()) { + return -EBUSY; + } + + ret = ram_block_discard_range(rb, 0, qemu_ram_get_used_length(rb)); + if (ret) { + error_report("Unexpected error discarding RAM: %s", strerror(-ret)); + return -EBUSY; + } + bitmap_clear(vmem->bitmap, 0, vmem->bitmap_size); + if (vmem->size) { + vmem->size = 0; + notifier_list_notify(&vmem->size_change_notifiers, &vmem->size); + } + trace_virtio_mem_unplugged_all(); + virtio_mem_resize_usable_region(vmem, vmem->requested_size, true); + return 0; +} + +static void virtio_mem_unplug_all_request(VirtIOMEM *vmem, + VirtQueueElement *elem) +{ + trace_virtio_mem_unplug_all_request(); + if (virtio_mem_unplug_all(vmem)) { + virtio_mem_send_response_simple(vmem, elem, VIRTIO_MEM_RESP_BUSY); + } else { + virtio_mem_send_response_simple(vmem, elem, VIRTIO_MEM_RESP_ACK); + } +} + +static void virtio_mem_state_request(VirtIOMEM *vmem, VirtQueueElement *elem, + struct virtio_mem_req *req) +{ + const uint16_t nb_blocks = le16_to_cpu(req->u.state.nb_blocks); + const uint64_t gpa = le64_to_cpu(req->u.state.addr); + const uint64_t size = nb_blocks * vmem->block_size; + struct virtio_mem_resp resp = { + .type = cpu_to_le16(VIRTIO_MEM_RESP_ACK), + }; + + trace_virtio_mem_state_request(gpa, nb_blocks); + if (!virtio_mem_valid_range(vmem, gpa, size)) { + virtio_mem_send_response_simple(vmem, elem, VIRTIO_MEM_RESP_ERROR); + return; + } + + if (virtio_mem_test_bitmap(vmem, gpa, size, true)) { + resp.u.state.state = cpu_to_le16(VIRTIO_MEM_STATE_PLUGGED); + } else if (virtio_mem_test_bitmap(vmem, gpa, size, false)) { + resp.u.state.state = cpu_to_le16(VIRTIO_MEM_STATE_UNPLUGGED); + } else { + resp.u.state.state = cpu_to_le16(VIRTIO_MEM_STATE_MIXED); + } + trace_virtio_mem_state_response(le16_to_cpu(resp.u.state.state)); + virtio_mem_send_response(vmem, elem, &resp); +} + +static void virtio_mem_handle_request(VirtIODevice *vdev, VirtQueue *vq) +{ + const int len = sizeof(struct virtio_mem_req); + VirtIOMEM *vmem = VIRTIO_MEM(vdev); + VirtQueueElement *elem; + struct virtio_mem_req req; + uint16_t type; + + while (true) { + elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); + if (!elem) { + return; + } + + if (iov_to_buf(elem->out_sg, elem->out_num, 0, &req, len) < len) { + virtio_error(vdev, "virtio-mem protocol violation: invalid request" + " size: %d", len); + g_free(elem); + return; + } + + if (iov_size(elem->in_sg, elem->in_num) < + sizeof(struct virtio_mem_resp)) { + virtio_error(vdev, "virtio-mem protocol violation: not enough space" + " for response: %zu", + iov_size(elem->in_sg, elem->in_num)); + g_free(elem); + return; + } + + type = le16_to_cpu(req.type); + switch (type) { + case VIRTIO_MEM_REQ_PLUG: + virtio_mem_plug_request(vmem, elem, &req); + break; + case VIRTIO_MEM_REQ_UNPLUG: + virtio_mem_unplug_request(vmem, elem, &req); + break; + case VIRTIO_MEM_REQ_UNPLUG_ALL: + virtio_mem_unplug_all_request(vmem, elem); + break; + case VIRTIO_MEM_REQ_STATE: + virtio_mem_state_request(vmem, elem, &req); + break; + default: + virtio_error(vdev, "virtio-mem protocol violation: unknown request" + " type: %d", type); + g_free(elem); + return; + } + + g_free(elem); + } +} + +static void virtio_mem_get_config(VirtIODevice *vdev, uint8_t *config_data) +{ + VirtIOMEM *vmem = VIRTIO_MEM(vdev); + struct virtio_mem_config *config = (void *) config_data; + + config->block_size = cpu_to_le64(vmem->block_size); + config->node_id = cpu_to_le16(vmem->node); + config->requested_size = cpu_to_le64(vmem->requested_size); + config->plugged_size = cpu_to_le64(vmem->size); + config->addr = cpu_to_le64(vmem->addr); + config->region_size = cpu_to_le64(memory_region_size(&vmem->memdev->mr)); + config->usable_region_size = cpu_to_le64(vmem->usable_region_size); +} + +static uint64_t virtio_mem_get_features(VirtIODevice *vdev, uint64_t features, + Error **errp) +{ + MachineState *ms = MACHINE(qdev_get_machine()); + + if (ms->numa_state) { +#if defined(CONFIG_ACPI) + virtio_add_feature(&features, VIRTIO_MEM_F_ACPI_PXM); +#endif + } + return features; +} + +static void virtio_mem_system_reset(void *opaque) +{ + VirtIOMEM *vmem = VIRTIO_MEM(opaque); + + /* + * During usual resets, we will unplug all memory and shrink the usable + * region size. This is, however, not possible in all scenarios. Then, + * the guest has to deal with this manually (VIRTIO_MEM_REQ_UNPLUG_ALL). + */ + virtio_mem_unplug_all(vmem); +} + +static void virtio_mem_device_realize(DeviceState *dev, Error **errp) +{ + MachineState *ms = MACHINE(qdev_get_machine()); + int nb_numa_nodes = ms->numa_state ? ms->numa_state->num_nodes : 0; + VirtIODevice *vdev = VIRTIO_DEVICE(dev); + VirtIOMEM *vmem = VIRTIO_MEM(dev); + uint64_t page_size; + RAMBlock *rb; + int ret; + + if (!vmem->memdev) { + error_setg(errp, "'%s' property is not set", VIRTIO_MEM_MEMDEV_PROP); + return; + } else if (host_memory_backend_is_mapped(vmem->memdev)) { + char *path = object_get_canonical_path_component(OBJECT(vmem->memdev)); + + error_setg(errp, "'%s' property specifies a busy memdev: %s", + VIRTIO_MEM_MEMDEV_PROP, path); + g_free(path); + return; + } else if (!memory_region_is_ram(&vmem->memdev->mr) || + memory_region_is_rom(&vmem->memdev->mr) || + !vmem->memdev->mr.ram_block) { + error_setg(errp, "'%s' property specifies an unsupported memdev", + VIRTIO_MEM_MEMDEV_PROP); + return; + } + + if ((nb_numa_nodes && vmem->node >= nb_numa_nodes) || + (!nb_numa_nodes && vmem->node)) { + error_setg(errp, "'%s' property has value '%" PRIu32 "', which exceeds" + "the number of numa nodes: %d", VIRTIO_MEM_NODE_PROP, + vmem->node, nb_numa_nodes ? nb_numa_nodes : 1); + return; + } + + if (enable_mlock) { + error_setg(errp, "Incompatible with mlock"); + return; + } + + rb = vmem->memdev->mr.ram_block; + page_size = qemu_ram_pagesize(rb); + + if (vmem->block_size < page_size) { + error_setg(errp, "'%s' property has to be at least the page size (0x%" + PRIx64 ")", VIRTIO_MEM_BLOCK_SIZE_PROP, page_size); + return; + } else if (!QEMU_IS_ALIGNED(vmem->requested_size, vmem->block_size)) { + error_setg(errp, "'%s' property has to be multiples of '%s' (0x%" PRIx64 + ")", VIRTIO_MEM_REQUESTED_SIZE_PROP, + VIRTIO_MEM_BLOCK_SIZE_PROP, vmem->block_size); + return; + } else if (!QEMU_IS_ALIGNED(memory_region_size(&vmem->memdev->mr), + vmem->block_size)) { + error_setg(errp, "'%s' property memdev size has to be multiples of" + "'%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) |