mirror of https://gitee.com/openkylin/qemu.git
1794 lines
53 KiB
C
1794 lines
53 KiB
C
/*
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* vhost-user
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*
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* Copyright (c) 2013 Virtual Open Systems Sarl.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "hw/virtio/vhost.h"
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#include "hw/virtio/vhost-user.h"
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#include "hw/virtio/vhost-backend.h"
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#include "hw/virtio/virtio.h"
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#include "hw/virtio/virtio-net.h"
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#include "chardev/char-fe.h"
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#include "sysemu/kvm.h"
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#include "qemu/error-report.h"
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#include "qemu/sockets.h"
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#include "sysemu/cryptodev.h"
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#include "migration/migration.h"
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#include "migration/postcopy-ram.h"
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#include "trace.h"
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <linux/vhost.h>
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#include <linux/userfaultfd.h>
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#define VHOST_MEMORY_MAX_NREGIONS 8
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#define VHOST_USER_F_PROTOCOL_FEATURES 30
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#define VHOST_USER_SLAVE_MAX_FDS 8
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/*
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* Maximum size of virtio device config space
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*/
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#define VHOST_USER_MAX_CONFIG_SIZE 256
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enum VhostUserProtocolFeature {
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VHOST_USER_PROTOCOL_F_MQ = 0,
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VHOST_USER_PROTOCOL_F_LOG_SHMFD = 1,
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VHOST_USER_PROTOCOL_F_RARP = 2,
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VHOST_USER_PROTOCOL_F_REPLY_ACK = 3,
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VHOST_USER_PROTOCOL_F_NET_MTU = 4,
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VHOST_USER_PROTOCOL_F_SLAVE_REQ = 5,
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VHOST_USER_PROTOCOL_F_CROSS_ENDIAN = 6,
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VHOST_USER_PROTOCOL_F_CRYPTO_SESSION = 7,
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VHOST_USER_PROTOCOL_F_PAGEFAULT = 8,
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VHOST_USER_PROTOCOL_F_CONFIG = 9,
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VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD = 10,
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VHOST_USER_PROTOCOL_F_HOST_NOTIFIER = 11,
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VHOST_USER_PROTOCOL_F_MAX
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};
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#define VHOST_USER_PROTOCOL_FEATURE_MASK ((1 << VHOST_USER_PROTOCOL_F_MAX) - 1)
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typedef enum VhostUserRequest {
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VHOST_USER_NONE = 0,
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VHOST_USER_GET_FEATURES = 1,
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VHOST_USER_SET_FEATURES = 2,
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VHOST_USER_SET_OWNER = 3,
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VHOST_USER_RESET_OWNER = 4,
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VHOST_USER_SET_MEM_TABLE = 5,
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VHOST_USER_SET_LOG_BASE = 6,
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VHOST_USER_SET_LOG_FD = 7,
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VHOST_USER_SET_VRING_NUM = 8,
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VHOST_USER_SET_VRING_ADDR = 9,
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VHOST_USER_SET_VRING_BASE = 10,
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VHOST_USER_GET_VRING_BASE = 11,
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VHOST_USER_SET_VRING_KICK = 12,
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VHOST_USER_SET_VRING_CALL = 13,
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VHOST_USER_SET_VRING_ERR = 14,
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VHOST_USER_GET_PROTOCOL_FEATURES = 15,
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VHOST_USER_SET_PROTOCOL_FEATURES = 16,
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VHOST_USER_GET_QUEUE_NUM = 17,
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VHOST_USER_SET_VRING_ENABLE = 18,
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VHOST_USER_SEND_RARP = 19,
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VHOST_USER_NET_SET_MTU = 20,
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VHOST_USER_SET_SLAVE_REQ_FD = 21,
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VHOST_USER_IOTLB_MSG = 22,
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VHOST_USER_SET_VRING_ENDIAN = 23,
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VHOST_USER_GET_CONFIG = 24,
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VHOST_USER_SET_CONFIG = 25,
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VHOST_USER_CREATE_CRYPTO_SESSION = 26,
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VHOST_USER_CLOSE_CRYPTO_SESSION = 27,
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VHOST_USER_POSTCOPY_ADVISE = 28,
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VHOST_USER_POSTCOPY_LISTEN = 29,
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VHOST_USER_POSTCOPY_END = 30,
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VHOST_USER_MAX
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} VhostUserRequest;
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typedef enum VhostUserSlaveRequest {
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VHOST_USER_SLAVE_NONE = 0,
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VHOST_USER_SLAVE_IOTLB_MSG = 1,
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VHOST_USER_SLAVE_CONFIG_CHANGE_MSG = 2,
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VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG = 3,
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VHOST_USER_SLAVE_MAX
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} VhostUserSlaveRequest;
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typedef struct VhostUserMemoryRegion {
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uint64_t guest_phys_addr;
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uint64_t memory_size;
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uint64_t userspace_addr;
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uint64_t mmap_offset;
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} VhostUserMemoryRegion;
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typedef struct VhostUserMemory {
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uint32_t nregions;
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uint32_t padding;
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VhostUserMemoryRegion regions[VHOST_MEMORY_MAX_NREGIONS];
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} VhostUserMemory;
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typedef struct VhostUserLog {
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uint64_t mmap_size;
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uint64_t mmap_offset;
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} VhostUserLog;
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typedef struct VhostUserConfig {
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uint32_t offset;
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uint32_t size;
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uint32_t flags;
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uint8_t region[VHOST_USER_MAX_CONFIG_SIZE];
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} VhostUserConfig;
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#define VHOST_CRYPTO_SYM_HMAC_MAX_KEY_LEN 512
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#define VHOST_CRYPTO_SYM_CIPHER_MAX_KEY_LEN 64
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typedef struct VhostUserCryptoSession {
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/* session id for success, -1 on errors */
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int64_t session_id;
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CryptoDevBackendSymSessionInfo session_setup_data;
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uint8_t key[VHOST_CRYPTO_SYM_CIPHER_MAX_KEY_LEN];
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uint8_t auth_key[VHOST_CRYPTO_SYM_HMAC_MAX_KEY_LEN];
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} VhostUserCryptoSession;
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static VhostUserConfig c __attribute__ ((unused));
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#define VHOST_USER_CONFIG_HDR_SIZE (sizeof(c.offset) \
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+ sizeof(c.size) \
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+ sizeof(c.flags))
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typedef struct VhostUserVringArea {
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uint64_t u64;
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uint64_t size;
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uint64_t offset;
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} VhostUserVringArea;
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typedef struct {
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VhostUserRequest request;
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#define VHOST_USER_VERSION_MASK (0x3)
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#define VHOST_USER_REPLY_MASK (0x1<<2)
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#define VHOST_USER_NEED_REPLY_MASK (0x1 << 3)
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uint32_t flags;
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uint32_t size; /* the following payload size */
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} QEMU_PACKED VhostUserHeader;
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typedef union {
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#define VHOST_USER_VRING_IDX_MASK (0xff)
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#define VHOST_USER_VRING_NOFD_MASK (0x1<<8)
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uint64_t u64;
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struct vhost_vring_state state;
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struct vhost_vring_addr addr;
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VhostUserMemory memory;
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VhostUserLog log;
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struct vhost_iotlb_msg iotlb;
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VhostUserConfig config;
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VhostUserCryptoSession session;
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VhostUserVringArea area;
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} VhostUserPayload;
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typedef struct VhostUserMsg {
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VhostUserHeader hdr;
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VhostUserPayload payload;
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} QEMU_PACKED VhostUserMsg;
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static VhostUserMsg m __attribute__ ((unused));
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#define VHOST_USER_HDR_SIZE (sizeof(VhostUserHeader))
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#define VHOST_USER_PAYLOAD_SIZE (sizeof(VhostUserPayload))
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/* The version of the protocol we support */
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#define VHOST_USER_VERSION (0x1)
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struct vhost_user {
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struct vhost_dev *dev;
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/* Shared between vhost devs of the same virtio device */
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VhostUserState *user;
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int slave_fd;
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NotifierWithReturn postcopy_notifier;
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struct PostCopyFD postcopy_fd;
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uint64_t postcopy_client_bases[VHOST_MEMORY_MAX_NREGIONS];
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/* Length of the region_rb and region_rb_offset arrays */
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size_t region_rb_len;
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/* RAMBlock associated with a given region */
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RAMBlock **region_rb;
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/* The offset from the start of the RAMBlock to the start of the
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* vhost region.
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*/
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ram_addr_t *region_rb_offset;
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/* True once we've entered postcopy_listen */
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bool postcopy_listen;
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};
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static bool ioeventfd_enabled(void)
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{
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return !kvm_enabled() || kvm_eventfds_enabled();
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}
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static int vhost_user_read(struct vhost_dev *dev, VhostUserMsg *msg)
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{
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struct vhost_user *u = dev->opaque;
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CharBackend *chr = u->user->chr;
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uint8_t *p = (uint8_t *) msg;
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int r, size = VHOST_USER_HDR_SIZE;
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r = qemu_chr_fe_read_all(chr, p, size);
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if (r != size) {
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error_report("Failed to read msg header. Read %d instead of %d."
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" Original request %d.", r, size, msg->hdr.request);
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goto fail;
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}
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/* validate received flags */
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if (msg->hdr.flags != (VHOST_USER_REPLY_MASK | VHOST_USER_VERSION)) {
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error_report("Failed to read msg header."
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" Flags 0x%x instead of 0x%x.", msg->hdr.flags,
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VHOST_USER_REPLY_MASK | VHOST_USER_VERSION);
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goto fail;
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}
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/* validate message size is sane */
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if (msg->hdr.size > VHOST_USER_PAYLOAD_SIZE) {
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error_report("Failed to read msg header."
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" Size %d exceeds the maximum %zu.", msg->hdr.size,
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VHOST_USER_PAYLOAD_SIZE);
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goto fail;
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}
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if (msg->hdr.size) {
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p += VHOST_USER_HDR_SIZE;
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size = msg->hdr.size;
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r = qemu_chr_fe_read_all(chr, p, size);
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if (r != size) {
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error_report("Failed to read msg payload."
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" Read %d instead of %d.", r, msg->hdr.size);
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goto fail;
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}
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}
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return 0;
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fail:
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return -1;
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}
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static int process_message_reply(struct vhost_dev *dev,
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const VhostUserMsg *msg)
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{
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VhostUserMsg msg_reply;
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if ((msg->hdr.flags & VHOST_USER_NEED_REPLY_MASK) == 0) {
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return 0;
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}
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if (vhost_user_read(dev, &msg_reply) < 0) {
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return -1;
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}
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if (msg_reply.hdr.request != msg->hdr.request) {
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error_report("Received unexpected msg type."
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"Expected %d received %d",
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msg->hdr.request, msg_reply.hdr.request);
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return -1;
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}
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return msg_reply.payload.u64 ? -1 : 0;
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}
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static bool vhost_user_one_time_request(VhostUserRequest request)
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{
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switch (request) {
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case VHOST_USER_SET_OWNER:
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case VHOST_USER_RESET_OWNER:
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case VHOST_USER_SET_MEM_TABLE:
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case VHOST_USER_GET_QUEUE_NUM:
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case VHOST_USER_NET_SET_MTU:
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return true;
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default:
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return false;
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}
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}
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/* most non-init callers ignore the error */
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static int vhost_user_write(struct vhost_dev *dev, VhostUserMsg *msg,
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int *fds, int fd_num)
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{
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struct vhost_user *u = dev->opaque;
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CharBackend *chr = u->user->chr;
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int ret, size = VHOST_USER_HDR_SIZE + msg->hdr.size;
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/*
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* For non-vring specific requests, like VHOST_USER_SET_MEM_TABLE,
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* we just need send it once in the first time. For later such
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* request, we just ignore it.
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*/
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if (vhost_user_one_time_request(msg->hdr.request) && dev->vq_index != 0) {
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msg->hdr.flags &= ~VHOST_USER_NEED_REPLY_MASK;
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return 0;
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}
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if (qemu_chr_fe_set_msgfds(chr, fds, fd_num) < 0) {
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error_report("Failed to set msg fds.");
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return -1;
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}
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ret = qemu_chr_fe_write_all(chr, (const uint8_t *) msg, size);
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if (ret != size) {
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error_report("Failed to write msg."
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" Wrote %d instead of %d.", ret, size);
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return -1;
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}
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return 0;
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}
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static int vhost_user_set_log_base(struct vhost_dev *dev, uint64_t base,
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struct vhost_log *log)
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{
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int fds[VHOST_MEMORY_MAX_NREGIONS];
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size_t fd_num = 0;
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bool shmfd = virtio_has_feature(dev->protocol_features,
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VHOST_USER_PROTOCOL_F_LOG_SHMFD);
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VhostUserMsg msg = {
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.hdr.request = VHOST_USER_SET_LOG_BASE,
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.hdr.flags = VHOST_USER_VERSION,
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.payload.log.mmap_size = log->size * sizeof(*(log->log)),
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.payload.log.mmap_offset = 0,
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.hdr.size = sizeof(msg.payload.log),
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};
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if (shmfd && log->fd != -1) {
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fds[fd_num++] = log->fd;
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}
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if (vhost_user_write(dev, &msg, fds, fd_num) < 0) {
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return -1;
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}
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if (shmfd) {
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msg.hdr.size = 0;
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if (vhost_user_read(dev, &msg) < 0) {
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return -1;
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}
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if (msg.hdr.request != VHOST_USER_SET_LOG_BASE) {
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error_report("Received unexpected msg type. "
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"Expected %d received %d",
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VHOST_USER_SET_LOG_BASE, msg.hdr.request);
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return -1;
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}
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}
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return 0;
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}
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static int vhost_user_set_mem_table_postcopy(struct vhost_dev *dev,
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struct vhost_memory *mem)
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{
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struct vhost_user *u = dev->opaque;
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int fds[VHOST_MEMORY_MAX_NREGIONS];
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int i, fd;
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size_t fd_num = 0;
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VhostUserMsg msg_reply;
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int region_i, msg_i;
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VhostUserMsg msg = {
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.hdr.request = VHOST_USER_SET_MEM_TABLE,
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.hdr.flags = VHOST_USER_VERSION,
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};
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if (u->region_rb_len < dev->mem->nregions) {
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u->region_rb = g_renew(RAMBlock*, u->region_rb, dev->mem->nregions);
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u->region_rb_offset = g_renew(ram_addr_t, u->region_rb_offset,
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dev->mem->nregions);
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memset(&(u->region_rb[u->region_rb_len]), '\0',
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sizeof(RAMBlock *) * (dev->mem->nregions - u->region_rb_len));
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memset(&(u->region_rb_offset[u->region_rb_len]), '\0',
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sizeof(ram_addr_t) * (dev->mem->nregions - u->region_rb_len));
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u->region_rb_len = dev->mem->nregions;
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}
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for (i = 0; i < dev->mem->nregions; ++i) {
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struct vhost_memory_region *reg = dev->mem->regions + i;
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ram_addr_t offset;
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MemoryRegion *mr;
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assert((uintptr_t)reg->userspace_addr == reg->userspace_addr);
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mr = memory_region_from_host((void *)(uintptr_t)reg->userspace_addr,
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&offset);
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fd = memory_region_get_fd(mr);
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if (fd > 0) {
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trace_vhost_user_set_mem_table_withfd(fd_num, mr->name,
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reg->memory_size,
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reg->guest_phys_addr,
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reg->userspace_addr, offset);
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u->region_rb_offset[i] = offset;
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u->region_rb[i] = mr->ram_block;
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msg.payload.memory.regions[fd_num].userspace_addr =
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reg->userspace_addr;
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msg.payload.memory.regions[fd_num].memory_size = reg->memory_size;
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msg.payload.memory.regions[fd_num].guest_phys_addr =
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reg->guest_phys_addr;
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msg.payload.memory.regions[fd_num].mmap_offset = offset;
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assert(fd_num < VHOST_MEMORY_MAX_NREGIONS);
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fds[fd_num++] = fd;
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} else {
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u->region_rb_offset[i] = 0;
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u->region_rb[i] = NULL;
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}
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}
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msg.payload.memory.nregions = fd_num;
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|
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if (!fd_num) {
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error_report("Failed initializing vhost-user memory map, "
|
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"consider using -object memory-backend-file share=on");
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return -1;
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}
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|
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msg.hdr.size = sizeof(msg.payload.memory.nregions);
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msg.hdr.size += sizeof(msg.payload.memory.padding);
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msg.hdr.size += fd_num * sizeof(VhostUserMemoryRegion);
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if (vhost_user_write(dev, &msg, fds, fd_num) < 0) {
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return -1;
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}
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if (vhost_user_read(dev, &msg_reply) < 0) {
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return -1;
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}
|
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|
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if (msg_reply.hdr.request != VHOST_USER_SET_MEM_TABLE) {
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error_report("%s: Received unexpected msg type."
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"Expected %d received %d", __func__,
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VHOST_USER_SET_MEM_TABLE, msg_reply.hdr.request);
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return -1;
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}
|
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/* We're using the same structure, just reusing one of the
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* fields, so it should be the same size.
|
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*/
|
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if (msg_reply.hdr.size != msg.hdr.size) {
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error_report("%s: Unexpected size for postcopy reply "
|
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"%d vs %d", __func__, msg_reply.hdr.size, msg.hdr.size);
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return -1;
|
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}
|
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|
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memset(u->postcopy_client_bases, 0,
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sizeof(uint64_t) * VHOST_MEMORY_MAX_NREGIONS);
|
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|
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/* They're in the same order as the regions that were sent
|
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* but some of the regions were skipped (above) if they
|
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* didn't have fd's
|
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*/
|
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for (msg_i = 0, region_i = 0;
|
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region_i < dev->mem->nregions;
|
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region_i++) {
|
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if (msg_i < fd_num &&
|
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msg_reply.payload.memory.regions[msg_i].guest_phys_addr ==
|
|
dev->mem->regions[region_i].guest_phys_addr) {
|
|
u->postcopy_client_bases[region_i] =
|
|
msg_reply.payload.memory.regions[msg_i].userspace_addr;
|
|
trace_vhost_user_set_mem_table_postcopy(
|
|
msg_reply.payload.memory.regions[msg_i].userspace_addr,
|
|
msg.payload.memory.regions[msg_i].userspace_addr,
|
|
msg_i, region_i);
|
|
msg_i++;
|
|
}
|
|
}
|
|
if (msg_i != fd_num) {
|
|
error_report("%s: postcopy reply not fully consumed "
|
|
"%d vs %zd",
|
|
__func__, msg_i, fd_num);
|
|
return -1;
|
|
}
|
|
/* Now we've registered this with the postcopy code, we ack to the client,
|
|
* because now we're in the position to be able to deal with any faults
|
|
* it generates.
|
|
*/
|
|
/* TODO: Use this for failure cases as well with a bad value */
|
|
msg.hdr.size = sizeof(msg.payload.u64);
|
|
msg.payload.u64 = 0; /* OK */
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_user_set_mem_table(struct vhost_dev *dev,
|
|
struct vhost_memory *mem)
|
|
{
|
|
struct vhost_user *u = dev->opaque;
|
|
int fds[VHOST_MEMORY_MAX_NREGIONS];
|
|
int i, fd;
|
|
size_t fd_num = 0;
|
|
bool do_postcopy = u->postcopy_listen && u->postcopy_fd.handler;
|
|
bool reply_supported = virtio_has_feature(dev->protocol_features,
|
|
VHOST_USER_PROTOCOL_F_REPLY_ACK);
|
|
|
|
if (do_postcopy) {
|
|
/* Postcopy has enough differences that it's best done in it's own
|
|
* version
|
|
*/
|
|
return vhost_user_set_mem_table_postcopy(dev, mem);
|
|
}
|
|
|
|
VhostUserMsg msg = {
|
|
.hdr.request = VHOST_USER_SET_MEM_TABLE,
|
|
.hdr.flags = VHOST_USER_VERSION,
|
|
};
|
|
|
|
if (reply_supported) {
|
|
msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK;
|
|
}
|
|
|
|
for (i = 0; i < dev->mem->nregions; ++i) {
|
|
struct vhost_memory_region *reg = dev->mem->regions + i;
|
|
ram_addr_t offset;
|
|
MemoryRegion *mr;
|
|
|
|
assert((uintptr_t)reg->userspace_addr == reg->userspace_addr);
|
|
mr = memory_region_from_host((void *)(uintptr_t)reg->userspace_addr,
|
|
&offset);
|
|
fd = memory_region_get_fd(mr);
|
|
if (fd > 0) {
|
|
if (fd_num == VHOST_MEMORY_MAX_NREGIONS) {
|
|
error_report("Failed preparing vhost-user memory table msg");
|
|
return -1;
|
|
}
|
|
msg.payload.memory.regions[fd_num].userspace_addr =
|
|
reg->userspace_addr;
|
|
msg.payload.memory.regions[fd_num].memory_size = reg->memory_size;
|
|
msg.payload.memory.regions[fd_num].guest_phys_addr =
|
|
reg->guest_phys_addr;
|
|
msg.payload.memory.regions[fd_num].mmap_offset = offset;
|
|
fds[fd_num++] = fd;
|
|
}
|
|
}
|
|
|
|
msg.payload.memory.nregions = fd_num;
|
|
|
|
if (!fd_num) {
|
|
error_report("Failed initializing vhost-user memory map, "
|
|
"consider using -object memory-backend-file share=on");
|
|
return -1;
|
|
}
|
|
|
|
msg.hdr.size = sizeof(msg.payload.memory.nregions);
|
|
msg.hdr.size += sizeof(msg.payload.memory.padding);
|
|
msg.hdr.size += fd_num * sizeof(VhostUserMemoryRegion);
|
|
|
|
if (vhost_user_write(dev, &msg, fds, fd_num) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (reply_supported) {
|
|
return process_message_reply(dev, &msg);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_user_set_vring_addr(struct vhost_dev *dev,
|
|
struct vhost_vring_addr *addr)
|
|
{
|
|
VhostUserMsg msg = {
|
|
.hdr.request = VHOST_USER_SET_VRING_ADDR,
|
|
.hdr.flags = VHOST_USER_VERSION,
|
|
.payload.addr = *addr,
|
|
.hdr.size = sizeof(msg.payload.addr),
|
|
};
|
|
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_user_set_vring_endian(struct vhost_dev *dev,
|
|
struct vhost_vring_state *ring)
|
|
{
|
|
bool cross_endian = virtio_has_feature(dev->protocol_features,
|
|
VHOST_USER_PROTOCOL_F_CROSS_ENDIAN);
|
|
VhostUserMsg msg = {
|
|
.hdr.request = VHOST_USER_SET_VRING_ENDIAN,
|
|
.hdr.flags = VHOST_USER_VERSION,
|
|
.payload.state = *ring,
|
|
.hdr.size = sizeof(msg.payload.state),
|
|
};
|
|
|
|
if (!cross_endian) {
|
|
error_report("vhost-user trying to send unhandled ioctl");
|
|
return -1;
|
|
}
|
|
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_set_vring(struct vhost_dev *dev,
|
|
unsigned long int request,
|
|
struct vhost_vring_state *ring)
|
|
{
|
|
VhostUserMsg msg = {
|
|
.hdr.request = request,
|
|
.hdr.flags = VHOST_USER_VERSION,
|
|
.payload.state = *ring,
|
|
.hdr.size = sizeof(msg.payload.state),
|
|
};
|
|
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_user_set_vring_num(struct vhost_dev *dev,
|
|
struct vhost_vring_state *ring)
|
|
{
|
|
return vhost_set_vring(dev, VHOST_USER_SET_VRING_NUM, ring);
|
|
}
|
|
|
|
static void vhost_user_host_notifier_restore(struct vhost_dev *dev,
|
|
int queue_idx)
|
|
{
|
|
struct vhost_user *u = dev->opaque;
|
|
VhostUserHostNotifier *n = &u->user->notifier[queue_idx];
|
|
VirtIODevice *vdev = dev->vdev;
|
|
|
|
if (n->addr && !n->set) {
|
|
virtio_queue_set_host_notifier_mr(vdev, queue_idx, &n->mr, true);
|
|
n->set = true;
|
|
}
|
|
}
|
|
|
|
static void vhost_user_host_notifier_remove(struct vhost_dev *dev,
|
|
int queue_idx)
|
|
{
|
|
struct vhost_user *u = dev->opaque;
|
|
VhostUserHostNotifier *n = &u->user->notifier[queue_idx];
|
|
VirtIODevice *vdev = dev->vdev;
|
|
|
|
if (n->addr && n->set) {
|
|
virtio_queue_set_host_notifier_mr(vdev, queue_idx, &n->mr, false);
|
|
n->set = false;
|
|
}
|
|
}
|
|
|
|
static int vhost_user_set_vring_base(struct vhost_dev *dev,
|
|
struct vhost_vring_state *ring)
|
|
{
|
|
vhost_user_host_notifier_restore(dev, ring->index);
|
|
|
|
return vhost_set_vring(dev, VHOST_USER_SET_VRING_BASE, ring);
|
|
}
|
|
|
|
static int vhost_user_set_vring_enable(struct vhost_dev *dev, int enable)
|
|
{
|
|
int i;
|
|
|
|
if (!virtio_has_feature(dev->features, VHOST_USER_F_PROTOCOL_FEATURES)) {
|
|
return -1;
|
|
}
|
|
|
|
for (i = 0; i < dev->nvqs; ++i) {
|
|
struct vhost_vring_state state = {
|
|
.index = dev->vq_index + i,
|
|
.num = enable,
|
|
};
|
|
|
|
vhost_set_vring(dev, VHOST_USER_SET_VRING_ENABLE, &state);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_user_get_vring_base(struct vhost_dev *dev,
|
|
struct vhost_vring_state *ring)
|
|
{
|
|
VhostUserMsg msg = {
|
|
.hdr.request = VHOST_USER_GET_VRING_BASE,
|
|
.hdr.flags = VHOST_USER_VERSION,
|
|
.payload.state = *ring,
|
|
.hdr.size = sizeof(msg.payload.state),
|
|
};
|
|
|
|
vhost_user_host_notifier_remove(dev, ring->index);
|
|
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (vhost_user_read(dev, &msg) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (msg.hdr.request != VHOST_USER_GET_VRING_BASE) {
|
|
error_report("Received unexpected msg type. Expected %d received %d",
|
|
VHOST_USER_GET_VRING_BASE, msg.hdr.request);
|
|
return -1;
|
|
}
|
|
|
|
if (msg.hdr.size != sizeof(msg.payload.state)) {
|
|
error_report("Received bad msg size.");
|
|
return -1;
|
|
}
|
|
|
|
*ring = msg.payload.state;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_set_vring_file(struct vhost_dev *dev,
|
|
VhostUserRequest request,
|
|
struct vhost_vring_file *file)
|
|
{
|
|
int fds[VHOST_MEMORY_MAX_NREGIONS];
|
|
size_t fd_num = 0;
|
|
VhostUserMsg msg = {
|
|
.hdr.request = request,
|
|
.hdr.flags = VHOST_USER_VERSION,
|
|
.payload.u64 = file->index & VHOST_USER_VRING_IDX_MASK,
|
|
.hdr.size = sizeof(msg.payload.u64),
|
|
};
|
|
|
|
if (ioeventfd_enabled() && file->fd > 0) {
|
|
fds[fd_num++] = file->fd;
|
|
} else {
|
|
msg.payload.u64 |= VHOST_USER_VRING_NOFD_MASK;
|
|
}
|
|
|
|
if (vhost_user_write(dev, &msg, fds, fd_num) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_user_set_vring_kick(struct vhost_dev *dev,
|
|
struct vhost_vring_file *file)
|
|
{
|
|
return vhost_set_vring_file(dev, VHOST_USER_SET_VRING_KICK, file);
|
|
}
|
|
|
|
static int vhost_user_set_vring_call(struct vhost_dev *dev,
|
|
struct vhost_vring_file *file)
|
|
{
|
|
return vhost_set_vring_file(dev, VHOST_USER_SET_VRING_CALL, file);
|
|
}
|
|
|
|
static int vhost_user_set_u64(struct vhost_dev *dev, int request, uint64_t u64)
|
|
{
|
|
VhostUserMsg msg = {
|
|
.hdr.request = request,
|
|
.hdr.flags = VHOST_USER_VERSION,
|
|
.payload.u64 = u64,
|
|
.hdr.size = sizeof(msg.payload.u64),
|
|
};
|
|
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_user_set_features(struct vhost_dev *dev,
|
|
uint64_t features)
|
|
{
|
|
return vhost_user_set_u64(dev, VHOST_USER_SET_FEATURES, features);
|
|
}
|
|
|
|
static int vhost_user_set_protocol_features(struct vhost_dev *dev,
|
|
uint64_t features)
|
|
{
|
|
return vhost_user_set_u64(dev, VHOST_USER_SET_PROTOCOL_FEATURES, features);
|
|
}
|
|
|
|
static int vhost_user_get_u64(struct vhost_dev *dev, int request, uint64_t *u64)
|
|
{
|
|
VhostUserMsg msg = {
|
|
.hdr.request = request,
|
|
.hdr.flags = VHOST_USER_VERSION,
|
|
};
|
|
|
|
if (vhost_user_one_time_request(request) && dev->vq_index != 0) {
|
|
return 0;
|
|
}
|
|
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (vhost_user_read(dev, &msg) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (msg.hdr.request != request) {
|
|
error_report("Received unexpected msg type. Expected %d received %d",
|
|
request, msg.hdr.request);
|
|
return -1;
|
|
}
|
|
|
|
if (msg.hdr.size != sizeof(msg.payload.u64)) {
|
|
error_report("Received bad msg size.");
|
|
return -1;
|
|
}
|
|
|
|
*u64 = msg.payload.u64;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_user_get_features(struct vhost_dev *dev, uint64_t *features)
|
|
{
|
|
return vhost_user_get_u64(dev, VHOST_USER_GET_FEATURES, features);
|
|
}
|
|
|
|
static int vhost_user_set_owner(struct vhost_dev *dev)
|
|
{
|
|
VhostUserMsg msg = {
|
|
.hdr.request = VHOST_USER_SET_OWNER,
|
|
.hdr.flags = VHOST_USER_VERSION,
|
|
};
|
|
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_user_reset_device(struct vhost_dev *dev)
|
|
{
|
|
VhostUserMsg msg = {
|
|
.hdr.request = VHOST_USER_RESET_OWNER,
|
|
.hdr.flags = VHOST_USER_VERSION,
|
|
};
|
|
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_user_slave_handle_config_change(struct vhost_dev *dev)
|
|
{
|
|
int ret = -1;
|
|
|
|
if (!dev->config_ops) {
|
|
return -1;
|
|
}
|
|
|
|
if (dev->config_ops->vhost_dev_config_notifier) {
|
|
ret = dev->config_ops->vhost_dev_config_notifier(dev);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int vhost_user_slave_handle_vring_host_notifier(struct vhost_dev *dev,
|
|
VhostUserVringArea *area,
|
|
int fd)
|
|
{
|
|
int queue_idx = area->u64 & VHOST_USER_VRING_IDX_MASK;
|
|
size_t page_size = qemu_real_host_page_size;
|
|
struct vhost_user *u = dev->opaque;
|
|
VhostUserState *user = u->user;
|
|
VirtIODevice *vdev = dev->vdev;
|
|
VhostUserHostNotifier *n;
|
|
void *addr;
|
|
char *name;
|
|
|
|
if (!virtio_has_feature(dev->protocol_features,
|
|
VHOST_USER_PROTOCOL_F_HOST_NOTIFIER) ||
|
|
vdev == NULL || queue_idx >= virtio_get_num_queues(vdev)) {
|
|
return -1;
|
|
}
|
|
|
|
n = &user->notifier[queue_idx];
|
|
|
|
if (n->addr) {
|
|
virtio_queue_set_host_notifier_mr(vdev, queue_idx, &n->mr, false);
|
|
object_unparent(OBJECT(&n->mr));
|
|
munmap(n->addr, page_size);
|
|
n->addr = NULL;
|
|
}
|
|
|
|
if (area->u64 & VHOST_USER_VRING_NOFD_MASK) {
|
|
return 0;
|
|
}
|
|
|
|
/* Sanity check. */
|
|
if (area->size != page_size) {
|
|
return -1;
|
|
}
|
|
|
|
addr = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED,
|
|
fd, area->offset);
|
|
if (addr == MAP_FAILED) {
|
|
return -1;
|
|
}
|
|
|
|
name = g_strdup_printf("vhost-user/host-notifier@%p mmaps[%d]",
|
|
user, queue_idx);
|
|
memory_region_init_ram_device_ptr(&n->mr, OBJECT(vdev), name,
|
|
page_size, addr);
|
|
g_free(name);
|
|
|
|
if (virtio_queue_set_host_notifier_mr(vdev, queue_idx, &n->mr, true)) {
|
|
munmap(addr, page_size);
|
|
return -1;
|
|
}
|
|
|
|
n->addr = addr;
|
|
n->set = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void slave_read(void *opaque)
|
|
{
|
|
struct vhost_dev *dev = opaque;
|
|
struct vhost_user *u = dev->opaque;
|
|
VhostUserHeader hdr = { 0, };
|
|
VhostUserPayload payload = { 0, };
|
|
int size, ret = 0;
|
|
struct iovec iov;
|
|
struct msghdr msgh;
|
|
int fd[VHOST_USER_SLAVE_MAX_FDS];
|
|
char control[CMSG_SPACE(sizeof(fd))];
|
|
struct cmsghdr *cmsg;
|
|
int i, fdsize = 0;
|
|
|
|
memset(&msgh, 0, sizeof(msgh));
|
|
msgh.msg_iov = &iov;
|
|
msgh.msg_iovlen = 1;
|
|
msgh.msg_control = control;
|
|
msgh.msg_controllen = sizeof(control);
|
|
|
|
memset(fd, -1, sizeof(fd));
|
|
|
|
/* Read header */
|
|
iov.iov_base = &hdr;
|
|
iov.iov_len = VHOST_USER_HDR_SIZE;
|
|
|
|
size = recvmsg(u->slave_fd, &msgh, 0);
|
|
if (size != VHOST_USER_HDR_SIZE) {
|
|
error_report("Failed to read from slave.");
|
|
goto err;
|
|
}
|
|
|
|
if (msgh.msg_flags & MSG_CTRUNC) {
|
|
error_report("Truncated message.");
|
|
goto err;
|
|
}
|
|
|
|
for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
|
|
cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
|
|
if (cmsg->cmsg_level == SOL_SOCKET &&
|
|
cmsg->cmsg_type == SCM_RIGHTS) {
|
|
fdsize = cmsg->cmsg_len - CMSG_LEN(0);
|
|
memcpy(fd, CMSG_DATA(cmsg), fdsize);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (hdr.size > VHOST_USER_PAYLOAD_SIZE) {
|
|
error_report("Failed to read msg header."
|
|
" Size %d exceeds the maximum %zu.", hdr.size,
|
|
VHOST_USER_PAYLOAD_SIZE);
|
|
goto err;
|
|
}
|
|
|
|
/* Read payload */
|
|
size = read(u->slave_fd, &payload, hdr.size);
|
|
if (size != hdr.size) {
|
|
error_report("Failed to read payload from slave.");
|
|
goto err;
|
|
}
|
|
|
|
switch (hdr.request) {
|
|
case VHOST_USER_SLAVE_IOTLB_MSG:
|
|
ret = vhost_backend_handle_iotlb_msg(dev, &payload.iotlb);
|
|
break;
|
|
case VHOST_USER_SLAVE_CONFIG_CHANGE_MSG :
|
|
ret = vhost_user_slave_handle_config_change(dev);
|
|
break;
|
|
case VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG:
|
|
ret = vhost_user_slave_handle_vring_host_notifier(dev, &payload.area,
|
|
fd[0]);
|
|
break;
|
|
default:
|
|
error_report("Received unexpected msg type.");
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/* Close the remaining file descriptors. */
|
|
for (i = 0; i < fdsize; i++) {
|
|
if (fd[i] != -1) {
|
|
close(fd[i]);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* REPLY_ACK feature handling. Other reply types has to be managed
|
|
* directly in their request handlers.
|
|
*/
|
|
if (hdr.flags & VHOST_USER_NEED_REPLY_MASK) {
|
|
struct iovec iovec[2];
|
|
|
|
|
|
hdr.flags &= ~VHOST_USER_NEED_REPLY_MASK;
|
|
hdr.flags |= VHOST_USER_REPLY_MASK;
|
|
|
|
payload.u64 = !!ret;
|
|
hdr.size = sizeof(payload.u64);
|
|
|
|
iovec[0].iov_base = &hdr;
|
|
iovec[0].iov_len = VHOST_USER_HDR_SIZE;
|
|
iovec[1].iov_base = &payload;
|
|
iovec[1].iov_len = hdr.size;
|
|
|
|
size = writev(u->slave_fd, iovec, ARRAY_SIZE(iovec));
|
|
if (size != VHOST_USER_HDR_SIZE + hdr.size) {
|
|
error_report("Failed to send msg reply to slave.");
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
return;
|
|
|
|
err:
|
|
qemu_set_fd_handler(u->slave_fd, NULL, NULL, NULL);
|
|
close(u->slave_fd);
|
|
u->slave_fd = -1;
|
|
for (i = 0; i < fdsize; i++) {
|
|
if (fd[i] != -1) {
|
|
close(fd[i]);
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
static int vhost_setup_slave_channel(struct vhost_dev *dev)
|
|
{
|
|
VhostUserMsg msg = {
|
|
.hdr.request = VHOST_USER_SET_SLAVE_REQ_FD,
|
|
.hdr.flags = VHOST_USER_VERSION,
|
|
};
|
|
struct vhost_user *u = dev->opaque;
|
|
int sv[2], ret = 0;
|
|
bool reply_supported = virtio_has_feature(dev->protocol_features,
|
|
VHOST_USER_PROTOCOL_F_REPLY_ACK);
|
|
|
|
if (!virtio_has_feature(dev->protocol_features,
|
|
VHOST_USER_PROTOCOL_F_SLAVE_REQ)) {
|
|
return 0;
|
|
}
|
|
|
|
if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) == -1) {
|
|
error_report("socketpair() failed");
|
|
return -1;
|
|
}
|
|
|
|
u->slave_fd = sv[0];
|
|
qemu_set_fd_handler(u->slave_fd, slave_read, NULL, dev);
|
|
|
|
if (reply_supported) {
|
|
msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK;
|
|
}
|
|
|
|
ret = vhost_user_write(dev, &msg, &sv[1], 1);
|
|
if (ret) {
|
|
goto out;
|
|
}
|
|
|
|
if (reply_supported) {
|
|
ret = process_message_reply(dev, &msg);
|
|
}
|
|
|
|
out:
|
|
close(sv[1]);
|
|
if (ret) {
|
|
qemu_set_fd_handler(u->slave_fd, NULL, NULL, NULL);
|
|
close(u->slave_fd);
|
|
u->slave_fd = -1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Called back from the postcopy fault thread when a fault is received on our
|
|
* ufd.
|
|
* TODO: This is Linux specific
|
|
*/
|
|
static int vhost_user_postcopy_fault_handler(struct PostCopyFD *pcfd,
|
|
void *ufd)
|
|
{
|
|
struct vhost_dev *dev = pcfd->data;
|
|
struct vhost_user *u = dev->opaque;
|
|
struct uffd_msg *msg = ufd;
|
|
uint64_t faultaddr = msg->arg.pagefault.address;
|
|
RAMBlock *rb = NULL;
|
|
uint64_t rb_offset;
|
|
int i;
|
|
|
|
trace_vhost_user_postcopy_fault_handler(pcfd->idstr, faultaddr,
|
|
dev->mem->nregions);
|
|
for (i = 0; i < MIN(dev->mem->nregions, u->region_rb_len); i++) {
|
|
trace_vhost_user_postcopy_fault_handler_loop(i,
|
|
u->postcopy_client_bases[i], dev->mem->regions[i].memory_size);
|
|
if (faultaddr >= u->postcopy_client_bases[i]) {
|
|
/* Ofset of the fault address in the vhost region */
|
|
uint64_t region_offset = faultaddr - u->postcopy_client_bases[i];
|
|
if (region_offset < dev->mem->regions[i].memory_size) {
|
|
rb_offset = region_offset + u->region_rb_offset[i];
|
|
trace_vhost_user_postcopy_fault_handler_found(i,
|
|
region_offset, rb_offset);
|
|
rb = u->region_rb[i];
|
|
return postcopy_request_shared_page(pcfd, rb, faultaddr,
|
|
rb_offset);
|
|
}
|
|
}
|
|
}
|
|
error_report("%s: Failed to find region for fault %" PRIx64,
|
|
__func__, faultaddr);
|
|
return -1;
|
|
}
|
|
|
|
static int vhost_user_postcopy_waker(struct PostCopyFD *pcfd, RAMBlock *rb,
|
|
uint64_t offset)
|
|
{
|
|
struct vhost_dev *dev = pcfd->data;
|
|
struct vhost_user *u = dev->opaque;
|
|
int i;
|
|
|
|
trace_vhost_user_postcopy_waker(qemu_ram_get_idstr(rb), offset);
|
|
|
|
if (!u) {
|
|
return 0;
|
|
}
|
|
/* Translate the offset into an address in the clients address space */
|
|
for (i = 0; i < MIN(dev->mem->nregions, u->region_rb_len); i++) {
|
|
if (u->region_rb[i] == rb &&
|
|
offset >= u->region_rb_offset[i] &&
|
|
offset < (u->region_rb_offset[i] +
|
|
dev->mem->regions[i].memory_size)) {
|
|
uint64_t client_addr = (offset - u->region_rb_offset[i]) +
|
|
u->postcopy_client_bases[i];
|
|
trace_vhost_user_postcopy_waker_found(client_addr);
|
|
return postcopy_wake_shared(pcfd, client_addr, rb);
|
|
}
|
|
}
|
|
|
|
trace_vhost_user_postcopy_waker_nomatch(qemu_ram_get_idstr(rb), offset);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Called at the start of an inbound postcopy on reception of the
|
|
* 'advise' command.
|
|
*/
|
|
static int vhost_user_postcopy_advise(struct vhost_dev *dev, Error **errp)
|
|
{
|
|
struct vhost_user *u = dev->opaque;
|
|
CharBackend *chr = u->user->chr;
|
|
int ufd;
|
|
VhostUserMsg msg = {
|
|
.hdr.request = VHOST_USER_POSTCOPY_ADVISE,
|
|
.hdr.flags = VHOST_USER_VERSION,
|
|
};
|
|
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
error_setg(errp, "Failed to send postcopy_advise to vhost");
|
|
return -1;
|
|
}
|
|
|
|
if (vhost_user_read(dev, &msg) < 0) {
|
|
error_setg(errp, "Failed to get postcopy_advise reply from vhost");
|
|
return -1;
|
|
}
|
|
|
|
if (msg.hdr.request != VHOST_USER_POSTCOPY_ADVISE) {
|
|
error_setg(errp, "Unexpected msg type. Expected %d received %d",
|
|
VHOST_USER_POSTCOPY_ADVISE, msg.hdr.request);
|
|
return -1;
|
|
}
|
|
|
|
if (msg.hdr.size) {
|
|
error_setg(errp, "Received bad msg size.");
|
|
return -1;
|
|
}
|
|
ufd = qemu_chr_fe_get_msgfd(chr);
|
|
if (ufd < 0) {
|
|
error_setg(errp, "%s: Failed to get ufd", __func__);
|
|
return -1;
|
|
}
|
|
qemu_set_nonblock(ufd);
|
|
|
|
/* register ufd with userfault thread */
|
|
u->postcopy_fd.fd = ufd;
|
|
u->postcopy_fd.data = dev;
|
|
u->postcopy_fd.handler = vhost_user_postcopy_fault_handler;
|
|
u->postcopy_fd.waker = vhost_user_postcopy_waker;
|
|
u->postcopy_fd.idstr = "vhost-user"; /* Need to find unique name */
|
|
postcopy_register_shared_ufd(&u->postcopy_fd);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Called at the switch to postcopy on reception of the 'listen' command.
|
|
*/
|
|
static int vhost_user_postcopy_listen(struct vhost_dev *dev, Error **errp)
|
|
{
|
|
struct vhost_user *u = dev->opaque;
|
|
int ret;
|
|
VhostUserMsg msg = {
|
|
.hdr.request = VHOST_USER_POSTCOPY_LISTEN,
|
|
.hdr.flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY_MASK,
|
|
};
|
|
u->postcopy_listen = true;
|
|
trace_vhost_user_postcopy_listen();
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
error_setg(errp, "Failed to send postcopy_listen to vhost");
|
|
return -1;
|
|
}
|
|
|
|
ret = process_message_reply(dev, &msg);
|
|
if (ret) {
|
|
error_setg(errp, "Failed to receive reply to postcopy_listen");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Called at the end of postcopy
|
|
*/
|
|
static int vhost_user_postcopy_end(struct vhost_dev *dev, Error **errp)
|
|
{
|
|
VhostUserMsg msg = {
|
|
.hdr.request = VHOST_USER_POSTCOPY_END,
|
|
.hdr.flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY_MASK,
|
|
};
|
|
int ret;
|
|
struct vhost_user *u = dev->opaque;
|
|
|
|
trace_vhost_user_postcopy_end_entry();
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
error_setg(errp, "Failed to send postcopy_end to vhost");
|
|
return -1;
|
|
}
|
|
|
|
ret = process_message_reply(dev, &msg);
|
|
if (ret) {
|
|
error_setg(errp, "Failed to receive reply to postcopy_end");
|
|
return ret;
|
|
}
|
|
postcopy_unregister_shared_ufd(&u->postcopy_fd);
|
|
close(u->postcopy_fd.fd);
|
|
u->postcopy_fd.handler = NULL;
|
|
|
|
trace_vhost_user_postcopy_end_exit();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_user_postcopy_notifier(NotifierWithReturn *notifier,
|
|
void *opaque)
|
|
{
|
|
struct PostcopyNotifyData *pnd = opaque;
|
|
struct vhost_user *u = container_of(notifier, struct vhost_user,
|
|
postcopy_notifier);
|
|
struct vhost_dev *dev = u->dev;
|
|
|
|
switch (pnd->reason) {
|
|
case POSTCOPY_NOTIFY_PROBE:
|
|
if (!virtio_has_feature(dev->protocol_features,
|
|
VHOST_USER_PROTOCOL_F_PAGEFAULT)) {
|
|
/* TODO: Get the device name into this error somehow */
|
|
error_setg(pnd->errp,
|
|
"vhost-user backend not capable of postcopy");
|
|
return -ENOENT;
|
|
}
|
|
break;
|
|
|
|
case POSTCOPY_NOTIFY_INBOUND_ADVISE:
|
|
return vhost_user_postcopy_advise(dev, pnd->errp);
|
|
|
|
case POSTCOPY_NOTIFY_INBOUND_LISTEN:
|
|
return vhost_user_postcopy_listen(dev, pnd->errp);
|
|
|
|
case POSTCOPY_NOTIFY_INBOUND_END:
|
|
return vhost_user_postcopy_end(dev, pnd->errp);
|
|
|
|
default:
|
|
/* We ignore notifications we don't know */
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque)
|
|
{
|
|
uint64_t features, protocol_features;
|
|
struct vhost_user *u;
|
|
int err;
|
|
|
|
assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
|
|
|
|
u = g_new0(struct vhost_user, 1);
|
|
u->user = opaque;
|
|
u->slave_fd = -1;
|
|
u->dev = dev;
|
|
dev->opaque = u;
|
|
|
|
err = vhost_user_get_features(dev, &features);
|
|
if (err < 0) {
|
|
return err;
|
|
}
|
|
|
|
if (virtio_has_feature(features, VHOST_USER_F_PROTOCOL_FEATURES)) {
|
|
dev->backend_features |= 1ULL << VHOST_USER_F_PROTOCOL_FEATURES;
|
|
|
|
err = vhost_user_get_u64(dev, VHOST_USER_GET_PROTOCOL_FEATURES,
|
|
&protocol_features);
|
|
if (err < 0) {
|
|
return err;
|
|
}
|
|
|
|
dev->protocol_features =
|
|
protocol_features & VHOST_USER_PROTOCOL_FEATURE_MASK;
|
|
|
|
if (!dev->config_ops || !dev->config_ops->vhost_dev_config_notifier) {
|
|
/* Don't acknowledge CONFIG feature if device doesn't support it */
|
|
dev->protocol_features &= ~(1ULL << VHOST_USER_PROTOCOL_F_CONFIG);
|
|
} else if (!(protocol_features &
|
|
(1ULL << VHOST_USER_PROTOCOL_F_CONFIG))) {
|
|
error_report("Device expects VHOST_USER_PROTOCOL_F_CONFIG "
|
|
"but backend does not support it.");
|
|
return -1;
|
|
}
|
|
|
|
err = vhost_user_set_protocol_features(dev, dev->protocol_features);
|
|
if (err < 0) {
|
|
return err;
|
|
}
|
|
|
|
/* query the max queues we support if backend supports Multiple Queue */
|
|
if (dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_MQ)) {
|
|
err = vhost_user_get_u64(dev, VHOST_USER_GET_QUEUE_NUM,
|
|
&dev->max_queues);
|
|
if (err < 0) {
|
|
return err;
|
|
}
|
|
}
|
|
|
|
if (virtio_has_feature(features, VIRTIO_F_IOMMU_PLATFORM) &&
|
|
!(virtio_has_feature(dev->protocol_features,
|
|
VHOST_USER_PROTOCOL_F_SLAVE_REQ) &&
|
|
virtio_has_feature(dev->protocol_features,
|
|
VHOST_USER_PROTOCOL_F_REPLY_ACK))) {
|
|
error_report("IOMMU support requires reply-ack and "
|
|
"slave-req protocol features.");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (dev->migration_blocker == NULL &&
|
|
!virtio_has_feature(dev->protocol_features,
|
|
VHOST_USER_PROTOCOL_F_LOG_SHMFD)) {
|
|
error_setg(&dev->migration_blocker,
|
|
"Migration disabled: vhost-user backend lacks "
|
|
"VHOST_USER_PROTOCOL_F_LOG_SHMFD feature.");
|
|
}
|
|
|
|
err = vhost_setup_slave_channel(dev);
|
|
if (err < 0) {
|
|
return err;
|
|
}
|
|
|
|
u->postcopy_notifier.notify = vhost_user_postcopy_notifier;
|
|
postcopy_add_notifier(&u->postcopy_notifier);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_user_backend_cleanup(struct vhost_dev *dev)
|
|
{
|
|
struct vhost_user *u;
|
|
|
|
assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
|
|
|
|
u = dev->opaque;
|
|
if (u->postcopy_notifier.notify) {
|
|
postcopy_remove_notifier(&u->postcopy_notifier);
|
|
u->postcopy_notifier.notify = NULL;
|
|
}
|
|
u->postcopy_listen = false;
|
|
if (u->postcopy_fd.handler) {
|
|
postcopy_unregister_shared_ufd(&u->postcopy_fd);
|
|
close(u->postcopy_fd.fd);
|
|
u->postcopy_fd.handler = NULL;
|
|
}
|
|
if (u->slave_fd >= 0) {
|
|
qemu_set_fd_handler(u->slave_fd, NULL, NULL, NULL);
|
|
close(u->slave_fd);
|
|
u->slave_fd = -1;
|
|
}
|
|
g_free(u->region_rb);
|
|
u->region_rb = NULL;
|
|
g_free(u->region_rb_offset);
|
|
u->region_rb_offset = NULL;
|
|
u->region_rb_len = 0;
|
|
g_free(u);
|
|
dev->opaque = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_user_get_vq_index(struct vhost_dev *dev, int idx)
|
|
{
|
|
assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs);
|
|
|
|
return idx;
|
|
}
|
|
|
|
static int vhost_user_memslots_limit(struct vhost_dev *dev)
|
|
{
|
|
return VHOST_MEMORY_MAX_NREGIONS;
|
|
}
|
|
|
|
static bool vhost_user_requires_shm_log(struct vhost_dev *dev)
|
|
{
|
|
assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
|
|
|
|
return virtio_has_feature(dev->protocol_features,
|
|
VHOST_USER_PROTOCOL_F_LOG_SHMFD);
|
|
}
|
|
|
|
static int vhost_user_migration_done(struct vhost_dev *dev, char* mac_addr)
|
|
{
|
|
VhostUserMsg msg = { };
|
|
|
|
assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
|
|
|
|
/* If guest supports GUEST_ANNOUNCE do nothing */
|
|
if (virtio_has_feature(dev->acked_features, VIRTIO_NET_F_GUEST_ANNOUNCE)) {
|
|
return 0;
|
|
}
|
|
|
|
/* if backend supports VHOST_USER_PROTOCOL_F_RARP ask it to send the RARP */
|
|
if (virtio_has_feature(dev->protocol_features,
|
|
VHOST_USER_PROTOCOL_F_RARP)) {
|
|
msg.hdr.request = VHOST_USER_SEND_RARP;
|
|
msg.hdr.flags = VHOST_USER_VERSION;
|
|
memcpy((char *)&msg.payload.u64, mac_addr, 6);
|
|
msg.hdr.size = sizeof(msg.payload.u64);
|
|
|
|
return vhost_user_write(dev, &msg, NULL, 0);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static bool vhost_user_can_merge(struct vhost_dev *dev,
|
|
uint64_t start1, uint64_t size1,
|
|
uint64_t start2, uint64_t size2)
|
|
{
|
|
ram_addr_t offset;
|
|
int mfd, rfd;
|
|
MemoryRegion *mr;
|
|
|
|
mr = memory_region_from_host((void *)(uintptr_t)start1, &offset);
|
|
mfd = memory_region_get_fd(mr);
|
|
|
|
mr = memory_region_from_host((void *)(uintptr_t)start2, &offset);
|
|
rfd = memory_region_get_fd(mr);
|
|
|
|
return mfd == rfd;
|
|
}
|
|
|
|
static int vhost_user_net_set_mtu(struct vhost_dev *dev, uint16_t mtu)
|
|
{
|
|
VhostUserMsg msg;
|
|
bool reply_supported = virtio_has_feature(dev->protocol_features,
|
|
VHOST_USER_PROTOCOL_F_REPLY_ACK);
|
|
|
|
if (!(dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_NET_MTU))) {
|
|
return 0;
|
|
}
|
|
|
|
msg.hdr.request = VHOST_USER_NET_SET_MTU;
|
|
msg.payload.u64 = mtu;
|
|
msg.hdr.size = sizeof(msg.payload.u64);
|
|
msg.hdr.flags = VHOST_USER_VERSION;
|
|
if (reply_supported) {
|
|
msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK;
|
|
}
|
|
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
/* If reply_ack supported, slave has to ack specified MTU is valid */
|
|
if (reply_supported) {
|
|
return process_message_reply(dev, &msg);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_user_send_device_iotlb_msg(struct vhost_dev *dev,
|
|
struct vhost_iotlb_msg *imsg)
|
|
{
|
|
VhostUserMsg msg = {
|
|
.hdr.request = VHOST_USER_IOTLB_MSG,
|
|
.hdr.size = sizeof(msg.payload.iotlb),
|
|
.hdr.flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY_MASK,
|
|
.payload.iotlb = *imsg,
|
|
};
|
|
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
return -EFAULT;
|
|
}
|
|
|
|
return process_message_reply(dev, &msg);
|
|
}
|
|
|
|
|
|
static void vhost_user_set_iotlb_callback(struct vhost_dev *dev, int enabled)
|
|
{
|
|
/* No-op as the receive channel is not dedicated to IOTLB messages. */
|
|
}
|
|
|
|
static int vhost_user_get_config(struct vhost_dev *dev, uint8_t *config,
|
|
uint32_t config_len)
|
|
{
|
|
VhostUserMsg msg = {
|
|
.hdr.request = VHOST_USER_GET_CONFIG,
|
|
.hdr.flags = VHOST_USER_VERSION,
|
|
.hdr.size = VHOST_USER_CONFIG_HDR_SIZE + config_len,
|
|
};
|
|
|
|
if (!virtio_has_feature(dev->protocol_features,
|
|
VHOST_USER_PROTOCOL_F_CONFIG)) {
|
|
return -1;
|
|
}
|
|
|
|
if (config_len > VHOST_USER_MAX_CONFIG_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
msg.payload.config.offset = 0;
|
|
msg.payload.config.size = config_len;
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (vhost_user_read(dev, &msg) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (msg.hdr.request != VHOST_USER_GET_CONFIG) {
|
|
error_report("Received unexpected msg type. Expected %d received %d",
|
|
VHOST_USER_GET_CONFIG, msg.hdr.request);
|
|
return -1;
|
|
}
|
|
|
|
if (msg.hdr.size != VHOST_USER_CONFIG_HDR_SIZE + config_len) {
|
|
error_report("Received bad msg size.");
|
|
return -1;
|
|
}
|
|
|
|
memcpy(config, msg.payload.config.region, config_len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_user_set_config(struct vhost_dev *dev, const uint8_t *data,
|
|
uint32_t offset, uint32_t size, uint32_t flags)
|
|
{
|
|
uint8_t *p;
|
|
bool reply_supported = virtio_has_feature(dev->protocol_features,
|
|
VHOST_USER_PROTOCOL_F_REPLY_ACK);
|
|
|
|
VhostUserMsg msg = {
|
|
.hdr.request = VHOST_USER_SET_CONFIG,
|
|
.hdr.flags = VHOST_USER_VERSION,
|
|
.hdr.size = VHOST_USER_CONFIG_HDR_SIZE + size,
|
|
};
|
|
|
|
if (!virtio_has_feature(dev->protocol_features,
|
|
VHOST_USER_PROTOCOL_F_CONFIG)) {
|
|
return -1;
|
|
}
|
|
|
|
if (reply_supported) {
|
|
msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK;
|
|
}
|
|
|
|
if (size > VHOST_USER_MAX_CONFIG_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
msg.payload.config.offset = offset,
|
|
msg.payload.config.size = size,
|
|
msg.payload.config.flags = flags,
|
|
p = msg.payload.config.region;
|
|
memcpy(p, data, size);
|
|
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (reply_supported) {
|
|
return process_message_reply(dev, &msg);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_user_crypto_create_session(struct vhost_dev *dev,
|
|
void *session_info,
|
|
uint64_t *session_id)
|
|
{
|
|
bool crypto_session = virtio_has_feature(dev->protocol_features,
|
|
VHOST_USER_PROTOCOL_F_CRYPTO_SESSION);
|
|
CryptoDevBackendSymSessionInfo *sess_info = session_info;
|
|
VhostUserMsg msg = {
|
|
.hdr.request = VHOST_USER_CREATE_CRYPTO_SESSION,
|
|
.hdr.flags = VHOST_USER_VERSION,
|
|
.hdr.size = sizeof(msg.payload.session),
|
|
};
|
|
|
|
assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
|
|
|
|
if (!crypto_session) {
|
|
error_report("vhost-user trying to send unhandled ioctl");
|
|
return -1;
|
|
}
|
|
|
|
memcpy(&msg.payload.session.session_setup_data, sess_info,
|
|
sizeof(CryptoDevBackendSymSessionInfo));
|
|
if (sess_info->key_len) {
|
|
memcpy(&msg.payload.session.key, sess_info->cipher_key,
|
|
sess_info->key_len);
|
|
}
|
|
if (sess_info->auth_key_len > 0) {
|
|
memcpy(&msg.payload.session.auth_key, sess_info->auth_key,
|
|
sess_info->auth_key_len);
|
|
}
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
error_report("vhost_user_write() return -1, create session failed");
|
|
return -1;
|
|
}
|
|
|
|
if (vhost_user_read(dev, &msg) < 0) {
|
|
error_report("vhost_user_read() return -1, create session failed");
|
|
return -1;
|
|
}
|
|
|
|
if (msg.hdr.request != VHOST_USER_CREATE_CRYPTO_SESSION) {
|
|
error_report("Received unexpected msg type. Expected %d received %d",
|
|
VHOST_USER_CREATE_CRYPTO_SESSION, msg.hdr.request);
|
|
return -1;
|
|
}
|
|
|
|
if (msg.hdr.size != sizeof(msg.payload.session)) {
|
|
error_report("Received bad msg size.");
|
|
return -1;
|
|
}
|
|
|
|
if (msg.payload.session.session_id < 0) {
|
|
error_report("Bad session id: %" PRId64 "",
|
|
msg.payload.session.session_id);
|
|
return -1;
|
|
}
|
|
*session_id = msg.payload.session.session_id;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
vhost_user_crypto_close_session(struct vhost_dev *dev, uint64_t session_id)
|
|
{
|
|
bool crypto_session = virtio_has_feature(dev->protocol_features,
|
|
VHOST_USER_PROTOCOL_F_CRYPTO_SESSION);
|
|
VhostUserMsg msg = {
|
|
.hdr.request = VHOST_USER_CLOSE_CRYPTO_SESSION,
|
|
.hdr.flags = VHOST_USER_VERSION,
|
|
.hdr.size = sizeof(msg.payload.u64),
|
|
};
|
|
msg.payload.u64 = session_id;
|
|
|
|
if (!crypto_session) {
|
|
error_report("vhost-user trying to send unhandled ioctl");
|
|
return -1;
|
|
}
|
|
|
|
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
|
error_report("vhost_user_write() return -1, close session failed");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool vhost_user_mem_section_filter(struct vhost_dev *dev,
|
|
MemoryRegionSection *section)
|
|
{
|
|
bool result;
|
|
|
|
result = memory_region_get_fd(section->mr) >= 0;
|
|
|
|
return result;
|
|
}
|
|
|
|
VhostUserState *vhost_user_init(void)
|
|
{
|
|
VhostUserState *user = g_new0(struct VhostUserState, 1);
|
|
|
|
return user;
|
|
}
|
|
|
|
void vhost_user_cleanup(VhostUserState *user)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
|
|
if (user->notifier[i].addr) {
|
|
object_unparent(OBJECT(&user->notifier[i].mr));
|
|
munmap(user->notifier[i].addr, qemu_real_host_page_size);
|
|
user->notifier[i].addr = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
const VhostOps user_ops = {
|
|
.backend_type = VHOST_BACKEND_TYPE_USER,
|
|
.vhost_backend_init = vhost_user_backend_init,
|
|
.vhost_backend_cleanup = vhost_user_backend_cleanup,
|
|
.vhost_backend_memslots_limit = vhost_user_memslots_limit,
|
|
.vhost_set_log_base = vhost_user_set_log_base,
|
|
.vhost_set_mem_table = vhost_user_set_mem_table,
|
|
.vhost_set_vring_addr = vhost_user_set_vring_addr,
|
|
.vhost_set_vring_endian = vhost_user_set_vring_endian,
|
|
.vhost_set_vring_num = vhost_user_set_vring_num,
|
|
.vhost_set_vring_base = vhost_user_set_vring_base,
|
|
.vhost_get_vring_base = vhost_user_get_vring_base,
|
|
.vhost_set_vring_kick = vhost_user_set_vring_kick,
|
|
.vhost_set_vring_call = vhost_user_set_vring_call,
|
|
.vhost_set_features = vhost_user_set_features,
|
|
.vhost_get_features = vhost_user_get_features,
|
|
.vhost_set_owner = vhost_user_set_owner,
|
|
.vhost_reset_device = vhost_user_reset_device,
|
|
.vhost_get_vq_index = vhost_user_get_vq_index,
|
|
.vhost_set_vring_enable = vhost_user_set_vring_enable,
|
|
.vhost_requires_shm_log = vhost_user_requires_shm_log,
|
|
.vhost_migration_done = vhost_user_migration_done,
|
|
.vhost_backend_can_merge = vhost_user_can_merge,
|
|
.vhost_net_set_mtu = vhost_user_net_set_mtu,
|
|
.vhost_set_iotlb_callback = vhost_user_set_iotlb_callback,
|
|
.vhost_send_device_iotlb_msg = vhost_user_send_device_iotlb_msg,
|
|
.vhost_get_config = vhost_user_get_config,
|
|
.vhost_set_config = vhost_user_set_config,
|
|
.vhost_crypto_create_session = vhost_user_crypto_create_session,
|
|
.vhost_crypto_close_session = vhost_user_crypto_close_session,
|
|
.vhost_backend_mem_section_filter = vhost_user_mem_section_filter,
|
|
};
|