Register a resize callback with the blockif interface. When the callback fires, update the size of the disk and notify the guest via a configuration change interrupt. Reviewed by: grehan, markj MFC after: 1 month Differential Revision: https://reviews.freebsd.org/D30506
591 lines
16 KiB
C
591 lines
16 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2011 NetApp, Inc.
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* All rights reserved.
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* Copyright 2020-2021 Joyent, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/linker_set.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <sys/ioctl.h>
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#include <sys/disk.h>
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#include <machine/vmm_snapshot.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <strings.h>
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#include <unistd.h>
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#include <assert.h>
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#include <pthread.h>
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#include <md5.h>
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#include "bhyverun.h"
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#include "config.h"
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#include "debug.h"
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#include "pci_emul.h"
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#include "virtio.h"
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#include "block_if.h"
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#define VTBLK_BSIZE 512
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#define VTBLK_RINGSZ 128
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_Static_assert(VTBLK_RINGSZ <= BLOCKIF_RING_MAX, "Each ring entry must be able to queue a request");
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#define VTBLK_S_OK 0
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#define VTBLK_S_IOERR 1
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#define VTBLK_S_UNSUPP 2
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#define VTBLK_BLK_ID_BYTES 20 + 1
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/* Capability bits */
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#define VTBLK_F_BARRIER (1 << 0) /* Does host support barriers? */
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#define VTBLK_F_SIZE_MAX (1 << 1) /* Indicates maximum segment size */
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#define VTBLK_F_SEG_MAX (1 << 2) /* Indicates maximum # of segments */
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#define VTBLK_F_GEOMETRY (1 << 4) /* Legacy geometry available */
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#define VTBLK_F_RO (1 << 5) /* Disk is read-only */
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#define VTBLK_F_BLK_SIZE (1 << 6) /* Block size of disk is available*/
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#define VTBLK_F_SCSI (1 << 7) /* Supports scsi command passthru */
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#define VTBLK_F_FLUSH (1 << 9) /* Writeback mode enabled after reset */
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#define VTBLK_F_WCE (1 << 9) /* Legacy alias for FLUSH */
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#define VTBLK_F_TOPOLOGY (1 << 10) /* Topology information is available */
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#define VTBLK_F_CONFIG_WCE (1 << 11) /* Writeback mode available in config */
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#define VTBLK_F_MQ (1 << 12) /* Multi-Queue */
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#define VTBLK_F_DISCARD (1 << 13) /* Trim blocks */
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#define VTBLK_F_WRITE_ZEROES (1 << 14) /* Write zeros */
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/*
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* Host capabilities
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*/
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#define VTBLK_S_HOSTCAPS \
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( VTBLK_F_SEG_MAX | \
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VTBLK_F_BLK_SIZE | \
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VTBLK_F_FLUSH | \
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VTBLK_F_TOPOLOGY | \
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VIRTIO_RING_F_INDIRECT_DESC ) /* indirect descriptors */
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/*
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* The current blockif_delete() interface only allows a single delete
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* request at a time.
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*/
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#define VTBLK_MAX_DISCARD_SEG 1
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/*
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* An arbitrary limit to prevent excessive latency due to large
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* delete requests.
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*/
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#define VTBLK_MAX_DISCARD_SECT ((16 << 20) / VTBLK_BSIZE) /* 16 MiB */
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/*
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* Config space "registers"
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*/
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struct vtblk_config {
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uint64_t vbc_capacity;
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uint32_t vbc_size_max;
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uint32_t vbc_seg_max;
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struct {
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uint16_t cylinders;
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uint8_t heads;
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uint8_t sectors;
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} vbc_geometry;
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uint32_t vbc_blk_size;
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struct {
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uint8_t physical_block_exp;
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uint8_t alignment_offset;
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uint16_t min_io_size;
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uint32_t opt_io_size;
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} vbc_topology;
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uint8_t vbc_writeback;
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uint8_t unused0[1];
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uint16_t num_queues;
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uint32_t max_discard_sectors;
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uint32_t max_discard_seg;
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uint32_t discard_sector_alignment;
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uint32_t max_write_zeroes_sectors;
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uint32_t max_write_zeroes_seg;
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uint8_t write_zeroes_may_unmap;
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uint8_t unused1[3];
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} __packed;
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/*
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* Fixed-size block header
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*/
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struct virtio_blk_hdr {
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#define VBH_OP_READ 0
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#define VBH_OP_WRITE 1
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#define VBH_OP_SCSI_CMD 2
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#define VBH_OP_SCSI_CMD_OUT 3
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#define VBH_OP_FLUSH 4
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#define VBH_OP_FLUSH_OUT 5
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#define VBH_OP_IDENT 8
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#define VBH_OP_DISCARD 11
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#define VBH_OP_WRITE_ZEROES 13
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#define VBH_FLAG_BARRIER 0x80000000 /* OR'ed into vbh_type */
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uint32_t vbh_type;
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uint32_t vbh_ioprio;
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uint64_t vbh_sector;
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} __packed;
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/*
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* Debug printf
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*/
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static int pci_vtblk_debug;
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#define DPRINTF(params) if (pci_vtblk_debug) PRINTLN params
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#define WPRINTF(params) PRINTLN params
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struct pci_vtblk_ioreq {
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struct blockif_req io_req;
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struct pci_vtblk_softc *io_sc;
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uint8_t *io_status;
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uint16_t io_idx;
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};
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struct virtio_blk_discard_write_zeroes {
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uint64_t sector;
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uint32_t num_sectors;
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struct {
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uint32_t unmap:1;
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uint32_t reserved:31;
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} flags;
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};
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/*
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* Per-device softc
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*/
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struct pci_vtblk_softc {
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struct virtio_softc vbsc_vs;
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pthread_mutex_t vsc_mtx;
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struct vqueue_info vbsc_vq;
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struct vtblk_config vbsc_cfg;
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struct virtio_consts vbsc_consts;
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struct blockif_ctxt *bc;
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char vbsc_ident[VTBLK_BLK_ID_BYTES];
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struct pci_vtblk_ioreq vbsc_ios[VTBLK_RINGSZ];
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};
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static void pci_vtblk_reset(void *);
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static void pci_vtblk_notify(void *, struct vqueue_info *);
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static int pci_vtblk_cfgread(void *, int, int, uint32_t *);
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static int pci_vtblk_cfgwrite(void *, int, int, uint32_t);
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#ifdef BHYVE_SNAPSHOT
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static void pci_vtblk_pause(void *);
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static void pci_vtblk_resume(void *);
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static int pci_vtblk_snapshot(void *, struct vm_snapshot_meta *);
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#endif
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static struct virtio_consts vtblk_vi_consts = {
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"vtblk", /* our name */
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1, /* we support 1 virtqueue */
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sizeof(struct vtblk_config), /* config reg size */
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pci_vtblk_reset, /* reset */
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pci_vtblk_notify, /* device-wide qnotify */
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pci_vtblk_cfgread, /* read PCI config */
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pci_vtblk_cfgwrite, /* write PCI config */
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NULL, /* apply negotiated features */
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VTBLK_S_HOSTCAPS, /* our capabilities */
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#ifdef BHYVE_SNAPSHOT
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pci_vtblk_pause, /* pause blockif threads */
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pci_vtblk_resume, /* resume blockif threads */
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pci_vtblk_snapshot, /* save / restore device state */
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#endif
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};
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static void
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pci_vtblk_reset(void *vsc)
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{
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struct pci_vtblk_softc *sc = vsc;
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DPRINTF(("vtblk: device reset requested !"));
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vi_reset_dev(&sc->vbsc_vs);
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}
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static void
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pci_vtblk_done_locked(struct pci_vtblk_ioreq *io, int err)
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{
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struct pci_vtblk_softc *sc = io->io_sc;
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/* convert errno into a virtio block error return */
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if (err == EOPNOTSUPP || err == ENOSYS)
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*io->io_status = VTBLK_S_UNSUPP;
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else if (err != 0)
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*io->io_status = VTBLK_S_IOERR;
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else
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*io->io_status = VTBLK_S_OK;
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/*
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* Return the descriptor back to the host.
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* We wrote 1 byte (our status) to host.
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*/
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vq_relchain(&sc->vbsc_vq, io->io_idx, 1);
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vq_endchains(&sc->vbsc_vq, 0);
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}
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#ifdef BHYVE_SNAPSHOT
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static void
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pci_vtblk_pause(void *vsc)
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{
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struct pci_vtblk_softc *sc = vsc;
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DPRINTF(("vtblk: device pause requested !\n"));
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blockif_pause(sc->bc);
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}
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static void
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pci_vtblk_resume(void *vsc)
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{
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struct pci_vtblk_softc *sc = vsc;
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DPRINTF(("vtblk: device resume requested !\n"));
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blockif_resume(sc->bc);
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}
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static int
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pci_vtblk_snapshot(void *vsc, struct vm_snapshot_meta *meta)
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{
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int ret;
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struct pci_vtblk_softc *sc = vsc;
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SNAPSHOT_VAR_OR_LEAVE(sc->vbsc_cfg, meta, ret, done);
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SNAPSHOT_BUF_OR_LEAVE(sc->vbsc_ident, sizeof(sc->vbsc_ident),
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meta, ret, done);
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done:
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return (ret);
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}
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#endif
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static void
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pci_vtblk_done(struct blockif_req *br, int err)
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{
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struct pci_vtblk_ioreq *io = br->br_param;
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struct pci_vtblk_softc *sc = io->io_sc;
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pthread_mutex_lock(&sc->vsc_mtx);
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pci_vtblk_done_locked(io, err);
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pthread_mutex_unlock(&sc->vsc_mtx);
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}
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static void
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pci_vtblk_proc(struct pci_vtblk_softc *sc, struct vqueue_info *vq)
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{
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struct virtio_blk_hdr *vbh;
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struct pci_vtblk_ioreq *io;
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int i, n;
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int err;
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ssize_t iolen;
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int writeop, type;
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struct vi_req req;
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struct iovec iov[BLOCKIF_IOV_MAX + 2];
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struct virtio_blk_discard_write_zeroes *discard;
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n = vq_getchain(vq, iov, BLOCKIF_IOV_MAX + 2, &req);
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/*
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* The first descriptor will be the read-only fixed header,
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* and the last is for status (hence +2 above and below).
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* The remaining iov's are the actual data I/O vectors.
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*
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* XXX - note - this fails on crash dump, which does a
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* VIRTIO_BLK_T_FLUSH with a zero transfer length
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*/
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assert(n >= 2 && n <= BLOCKIF_IOV_MAX + 2);
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io = &sc->vbsc_ios[req.idx];
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assert(req.readable != 0);
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assert(iov[0].iov_len == sizeof(struct virtio_blk_hdr));
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vbh = (struct virtio_blk_hdr *)iov[0].iov_base;
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memcpy(&io->io_req.br_iov, &iov[1], sizeof(struct iovec) * (n - 2));
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io->io_req.br_iovcnt = n - 2;
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io->io_req.br_offset = vbh->vbh_sector * VTBLK_BSIZE;
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io->io_status = (uint8_t *)iov[--n].iov_base;
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assert(req.writable != 0);
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assert(iov[n].iov_len == 1);
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/*
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* XXX
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* The guest should not be setting the BARRIER flag because
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* we don't advertise the capability.
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*/
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type = vbh->vbh_type & ~VBH_FLAG_BARRIER;
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writeop = (type == VBH_OP_WRITE || type == VBH_OP_DISCARD);
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/*
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* - Write op implies read-only descriptor
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* - Read/ident op implies write-only descriptor
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*
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* By taking away either the read-only fixed header or the write-only
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* status iovec, the following condition should hold true.
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*/
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assert(n == (writeop ? req.readable : req.writable));
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iolen = 0;
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for (i = 1; i < n; i++) {
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iolen += iov[i].iov_len;
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}
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io->io_req.br_resid = iolen;
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DPRINTF(("virtio-block: %s op, %zd bytes, %d segs, offset %ld",
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writeop ? "write/discard" : "read/ident", iolen, i - 1,
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io->io_req.br_offset));
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switch (type) {
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case VBH_OP_READ:
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err = blockif_read(sc->bc, &io->io_req);
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break;
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case VBH_OP_WRITE:
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err = blockif_write(sc->bc, &io->io_req);
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break;
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case VBH_OP_DISCARD:
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/*
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* We currently only support a single request, if the guest
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* has submitted a request that doesn't conform to the
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* requirements, we return a error.
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*/
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if (iov[1].iov_len != sizeof (*discard)) {
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pci_vtblk_done_locked(io, EINVAL);
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return;
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}
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/* The segments to discard are provided rather than data */
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discard = (struct virtio_blk_discard_write_zeroes *)
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iov[1].iov_base;
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/*
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* virtio v1.1 5.2.6.2:
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* The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP
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* for discard and write zeroes commands if any unknown flag is
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* set. Furthermore, the device MUST set the status byte to
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* VIRTIO_BLK_S_UNSUPP for discard commands if the unmap flag
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* is set.
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*
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* Currently there are no known flags for a DISCARD request.
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*/
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if (discard->flags.unmap != 0 || discard->flags.reserved != 0) {
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pci_vtblk_done_locked(io, ENOTSUP);
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return;
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}
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/* Make sure the request doesn't exceed our size limit */
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if (discard->num_sectors > VTBLK_MAX_DISCARD_SECT) {
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pci_vtblk_done_locked(io, EINVAL);
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return;
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}
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io->io_req.br_offset = discard->sector * VTBLK_BSIZE;
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io->io_req.br_resid = discard->num_sectors * VTBLK_BSIZE;
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err = blockif_delete(sc->bc, &io->io_req);
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break;
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case VBH_OP_FLUSH:
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case VBH_OP_FLUSH_OUT:
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err = blockif_flush(sc->bc, &io->io_req);
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break;
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case VBH_OP_IDENT:
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/* Assume a single buffer */
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/* S/n equal to buffer is not zero-terminated. */
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memset(iov[1].iov_base, 0, iov[1].iov_len);
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strncpy(iov[1].iov_base, sc->vbsc_ident,
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MIN(iov[1].iov_len, sizeof(sc->vbsc_ident)));
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pci_vtblk_done_locked(io, 0);
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return;
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default:
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pci_vtblk_done_locked(io, EOPNOTSUPP);
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return;
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}
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assert(err == 0);
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}
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static void
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pci_vtblk_notify(void *vsc, struct vqueue_info *vq)
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{
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struct pci_vtblk_softc *sc = vsc;
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while (vq_has_descs(vq))
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pci_vtblk_proc(sc, vq);
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}
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static void
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pci_vtblk_resized(struct blockif_ctxt *bctxt, void *arg, size_t new_size)
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{
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struct pci_vtblk_softc *sc;
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sc = arg;
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sc->vbsc_cfg.vbc_capacity = new_size / VTBLK_BSIZE; /* 512-byte units */
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vi_interrupt(&sc->vbsc_vs, VIRTIO_PCI_ISR_CONFIG,
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sc->vbsc_vs.vs_msix_cfg_idx);
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}
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static int
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pci_vtblk_init(struct vmctx *ctx, struct pci_devinst *pi, nvlist_t *nvl)
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{
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char bident[sizeof("XX:X:X")];
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struct blockif_ctxt *bctxt;
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const char *path;
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MD5_CTX mdctx;
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u_char digest[16];
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struct pci_vtblk_softc *sc;
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off_t size;
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int i, sectsz, sts, sto;
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/*
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* The supplied backing file has to exist
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*/
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snprintf(bident, sizeof(bident), "%d:%d", pi->pi_slot, pi->pi_func);
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bctxt = blockif_open(nvl, bident);
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if (bctxt == NULL) {
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perror("Could not open backing file");
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return (1);
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}
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size = blockif_size(bctxt);
|
|
sectsz = blockif_sectsz(bctxt);
|
|
blockif_psectsz(bctxt, &sts, &sto);
|
|
|
|
sc = calloc(1, sizeof(struct pci_vtblk_softc));
|
|
sc->bc = bctxt;
|
|
for (i = 0; i < VTBLK_RINGSZ; i++) {
|
|
struct pci_vtblk_ioreq *io = &sc->vbsc_ios[i];
|
|
io->io_req.br_callback = pci_vtblk_done;
|
|
io->io_req.br_param = io;
|
|
io->io_sc = sc;
|
|
io->io_idx = i;
|
|
}
|
|
|
|
bcopy(&vtblk_vi_consts, &sc->vbsc_consts, sizeof (vtblk_vi_consts));
|
|
if (blockif_candelete(sc->bc))
|
|
sc->vbsc_consts.vc_hv_caps |= VTBLK_F_DISCARD;
|
|
|
|
pthread_mutex_init(&sc->vsc_mtx, NULL);
|
|
|
|
/* init virtio softc and virtqueues */
|
|
vi_softc_linkup(&sc->vbsc_vs, &sc->vbsc_consts, sc, pi, &sc->vbsc_vq);
|
|
sc->vbsc_vs.vs_mtx = &sc->vsc_mtx;
|
|
|
|
sc->vbsc_vq.vq_qsize = VTBLK_RINGSZ;
|
|
/* sc->vbsc_vq.vq_notify = we have no per-queue notify */
|
|
|
|
/*
|
|
* Create an identifier for the backing file. Use parts of the
|
|
* md5 sum of the filename
|
|
*/
|
|
path = get_config_value_node(nvl, "path");
|
|
MD5Init(&mdctx);
|
|
MD5Update(&mdctx, path, strlen(path));
|
|
MD5Final(digest, &mdctx);
|
|
snprintf(sc->vbsc_ident, VTBLK_BLK_ID_BYTES,
|
|
"BHYVE-%02X%02X-%02X%02X-%02X%02X",
|
|
digest[0], digest[1], digest[2], digest[3], digest[4], digest[5]);
|
|
|
|
/* setup virtio block config space */
|
|
sc->vbsc_cfg.vbc_capacity = size / VTBLK_BSIZE; /* 512-byte units */
|
|
sc->vbsc_cfg.vbc_size_max = 0; /* not negotiated */
|
|
|
|
/*
|
|
* If Linux is presented with a seg_max greater than the virtio queue
|
|
* size, it can stumble into situations where it violates its own
|
|
* invariants and panics. For safety, we keep seg_max clamped, paying
|
|
* heed to the two extra descriptors needed for the header and status
|
|
* of a request.
|
|
*/
|
|
sc->vbsc_cfg.vbc_seg_max = MIN(VTBLK_RINGSZ - 2, BLOCKIF_IOV_MAX);
|
|
sc->vbsc_cfg.vbc_geometry.cylinders = 0; /* no geometry */
|
|
sc->vbsc_cfg.vbc_geometry.heads = 0;
|
|
sc->vbsc_cfg.vbc_geometry.sectors = 0;
|
|
sc->vbsc_cfg.vbc_blk_size = sectsz;
|
|
sc->vbsc_cfg.vbc_topology.physical_block_exp =
|
|
(sts > sectsz) ? (ffsll(sts / sectsz) - 1) : 0;
|
|
sc->vbsc_cfg.vbc_topology.alignment_offset =
|
|
(sto != 0) ? ((sts - sto) / sectsz) : 0;
|
|
sc->vbsc_cfg.vbc_topology.min_io_size = 0;
|
|
sc->vbsc_cfg.vbc_topology.opt_io_size = 0;
|
|
sc->vbsc_cfg.vbc_writeback = 0;
|
|
sc->vbsc_cfg.max_discard_sectors = VTBLK_MAX_DISCARD_SECT;
|
|
sc->vbsc_cfg.max_discard_seg = VTBLK_MAX_DISCARD_SEG;
|
|
sc->vbsc_cfg.discard_sector_alignment = MAX(sectsz, sts) / VTBLK_BSIZE;
|
|
|
|
/*
|
|
* Should we move some of this into virtio.c? Could
|
|
* have the device, class, and subdev_0 as fields in
|
|
* the virtio constants structure.
|
|
*/
|
|
pci_set_cfgdata16(pi, PCIR_DEVICE, VIRTIO_DEV_BLOCK);
|
|
pci_set_cfgdata16(pi, PCIR_VENDOR, VIRTIO_VENDOR);
|
|
pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_STORAGE);
|
|
pci_set_cfgdata16(pi, PCIR_SUBDEV_0, VIRTIO_ID_BLOCK);
|
|
pci_set_cfgdata16(pi, PCIR_SUBVEND_0, VIRTIO_VENDOR);
|
|
|
|
if (vi_intr_init(&sc->vbsc_vs, 1, fbsdrun_virtio_msix())) {
|
|
blockif_close(sc->bc);
|
|
free(sc);
|
|
return (1);
|
|
}
|
|
vi_set_io_bar(&sc->vbsc_vs, 0);
|
|
blockif_register_resize_callback(sc->bc, pci_vtblk_resized, sc);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
pci_vtblk_cfgwrite(void *vsc, int offset, int size, uint32_t value)
|
|
{
|
|
|
|
DPRINTF(("vtblk: write to readonly reg %d", offset));
|
|
return (1);
|
|
}
|
|
|
|
static int
|
|
pci_vtblk_cfgread(void *vsc, int offset, int size, uint32_t *retval)
|
|
{
|
|
struct pci_vtblk_softc *sc = vsc;
|
|
void *ptr;
|
|
|
|
/* our caller has already verified offset and size */
|
|
ptr = (uint8_t *)&sc->vbsc_cfg + offset;
|
|
memcpy(retval, ptr, size);
|
|
return (0);
|
|
}
|
|
|
|
struct pci_devemu pci_de_vblk = {
|
|
.pe_emu = "virtio-blk",
|
|
.pe_init = pci_vtblk_init,
|
|
.pe_legacy_config = blockif_legacy_config,
|
|
.pe_barwrite = vi_pci_write,
|
|
.pe_barread = vi_pci_read,
|
|
#ifdef BHYVE_SNAPSHOT
|
|
.pe_snapshot = vi_pci_snapshot,
|
|
#endif
|
|
};
|
|
PCI_EMUL_SET(pci_de_vblk);
|