Fuzzing discovered that virtqueue_unmap_sg() is being called on modified
req->in/out_sg iovecs. This means dma_memory_map() and
dma_memory_unmap() calls do not have matching memory addresses.
Fuzzing discovered that non-RAM addresses trigger a bug:
void address_space_unmap(AddressSpace *as, void *buffer, hwaddr len,
bool is_write, hwaddr access_len)
{
if (buffer != bounce.buffer) {
^^^^^^^^^^^^^^^^^^^^^^^
A modified iov->iov_base is no longer recognized as a bounce buffer and
the wrong branch is taken.
There are more potential bugs: dirty memory is not tracked correctly and
MemoryRegion refcounts can be leaked.
Use the new iov_discard_undo() API to restore elem->in/out_sg before
virtqueue_push() is called.
Fixes: 827805a249
("virtio-blk: Convert VirtIOBlockReq.out to structrue")
Reported-by: Alexander Bulekov <alxndr@bu.edu>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Buglink: https://bugs.launchpad.net/qemu/+bug/1890360
Message-Id: <20200917094455.822379-3-stefanha@redhat.com>
1348 lines
44 KiB
C
1348 lines
44 KiB
C
/*
|
|
* Virtio Block Device
|
|
*
|
|
* Copyright IBM, Corp. 2007
|
|
*
|
|
* Authors:
|
|
* Anthony Liguori <aliguori@us.ibm.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
|
* the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "qapi/error.h"
|
|
#include "qemu/iov.h"
|
|
#include "qemu/module.h"
|
|
#include "qemu/error-report.h"
|
|
#include "qemu/main-loop.h"
|
|
#include "trace.h"
|
|
#include "hw/block/block.h"
|
|
#include "hw/qdev-properties.h"
|
|
#include "sysemu/blockdev.h"
|
|
#include "sysemu/sysemu.h"
|
|
#include "sysemu/runstate.h"
|
|
#include "hw/virtio/virtio-blk.h"
|
|
#include "dataplane/virtio-blk.h"
|
|
#include "scsi/constants.h"
|
|
#ifdef __linux__
|
|
# include <scsi/sg.h>
|
|
#endif
|
|
#include "hw/virtio/virtio-bus.h"
|
|
#include "migration/qemu-file-types.h"
|
|
#include "hw/virtio/virtio-access.h"
|
|
|
|
/* Config size before the discard support (hide associated config fields) */
|
|
#define VIRTIO_BLK_CFG_SIZE offsetof(struct virtio_blk_config, \
|
|
max_discard_sectors)
|
|
/*
|
|
* Starting from the discard feature, we can use this array to properly
|
|
* set the config size depending on the features enabled.
|
|
*/
|
|
static VirtIOFeature feature_sizes[] = {
|
|
{.flags = 1ULL << VIRTIO_BLK_F_DISCARD,
|
|
.end = endof(struct virtio_blk_config, discard_sector_alignment)},
|
|
{.flags = 1ULL << VIRTIO_BLK_F_WRITE_ZEROES,
|
|
.end = endof(struct virtio_blk_config, write_zeroes_may_unmap)},
|
|
{}
|
|
};
|
|
|
|
static void virtio_blk_set_config_size(VirtIOBlock *s, uint64_t host_features)
|
|
{
|
|
s->config_size = MAX(VIRTIO_BLK_CFG_SIZE,
|
|
virtio_feature_get_config_size(feature_sizes, host_features));
|
|
|
|
assert(s->config_size <= sizeof(struct virtio_blk_config));
|
|
}
|
|
|
|
static void virtio_blk_init_request(VirtIOBlock *s, VirtQueue *vq,
|
|
VirtIOBlockReq *req)
|
|
{
|
|
req->dev = s;
|
|
req->vq = vq;
|
|
req->qiov.size = 0;
|
|
req->in_len = 0;
|
|
req->next = NULL;
|
|
req->mr_next = NULL;
|
|
}
|
|
|
|
static void virtio_blk_free_request(VirtIOBlockReq *req)
|
|
{
|
|
g_free(req);
|
|
}
|
|
|
|
static void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status)
|
|
{
|
|
VirtIOBlock *s = req->dev;
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(s);
|
|
|
|
trace_virtio_blk_req_complete(vdev, req, status);
|
|
|
|
stb_p(&req->in->status, status);
|
|
iov_discard_undo(&req->inhdr_undo);
|
|
iov_discard_undo(&req->outhdr_undo);
|
|
virtqueue_push(req->vq, &req->elem, req->in_len);
|
|
if (s->dataplane_started && !s->dataplane_disabled) {
|
|
virtio_blk_data_plane_notify(s->dataplane, req->vq);
|
|
} else {
|
|
virtio_notify(vdev, req->vq);
|
|
}
|
|
}
|
|
|
|
static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error,
|
|
bool is_read, bool acct_failed)
|
|
{
|
|
VirtIOBlock *s = req->dev;
|
|
BlockErrorAction action = blk_get_error_action(s->blk, is_read, error);
|
|
|
|
if (action == BLOCK_ERROR_ACTION_STOP) {
|
|
/* Break the link as the next request is going to be parsed from the
|
|
* ring again. Otherwise we may end up doing a double completion! */
|
|
req->mr_next = NULL;
|
|
req->next = s->rq;
|
|
s->rq = req;
|
|
} else if (action == BLOCK_ERROR_ACTION_REPORT) {
|
|
virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
|
|
if (acct_failed) {
|
|
block_acct_failed(blk_get_stats(s->blk), &req->acct);
|
|
}
|
|
virtio_blk_free_request(req);
|
|
}
|
|
|
|
blk_error_action(s->blk, action, is_read, error);
|
|
return action != BLOCK_ERROR_ACTION_IGNORE;
|
|
}
|
|
|
|
static void virtio_blk_rw_complete(void *opaque, int ret)
|
|
{
|
|
VirtIOBlockReq *next = opaque;
|
|
VirtIOBlock *s = next->dev;
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(s);
|
|
|
|
aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
|
|
while (next) {
|
|
VirtIOBlockReq *req = next;
|
|
next = req->mr_next;
|
|
trace_virtio_blk_rw_complete(vdev, req, ret);
|
|
|
|
if (req->qiov.nalloc != -1) {
|
|
/* If nalloc is != -1 req->qiov is a local copy of the original
|
|
* external iovec. It was allocated in submit_requests to be
|
|
* able to merge requests. */
|
|
qemu_iovec_destroy(&req->qiov);
|
|
}
|
|
|
|
if (ret) {
|
|
int p = virtio_ldl_p(VIRTIO_DEVICE(s), &req->out.type);
|
|
bool is_read = !(p & VIRTIO_BLK_T_OUT);
|
|
/* Note that memory may be dirtied on read failure. If the
|
|
* virtio request is not completed here, as is the case for
|
|
* BLOCK_ERROR_ACTION_STOP, the memory may not be copied
|
|
* correctly during live migration. While this is ugly,
|
|
* it is acceptable because the device is free to write to
|
|
* the memory until the request is completed (which will
|
|
* happen on the other side of the migration).
|
|
*/
|
|
if (virtio_blk_handle_rw_error(req, -ret, is_read, true)) {
|
|
continue;
|
|
}
|
|
}
|
|
|
|
virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
|
|
block_acct_done(blk_get_stats(s->blk), &req->acct);
|
|
virtio_blk_free_request(req);
|
|
}
|
|
aio_context_release(blk_get_aio_context(s->conf.conf.blk));
|
|
}
|
|
|
|
static void virtio_blk_flush_complete(void *opaque, int ret)
|
|
{
|
|
VirtIOBlockReq *req = opaque;
|
|
VirtIOBlock *s = req->dev;
|
|
|
|
aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
|
|
if (ret) {
|
|
if (virtio_blk_handle_rw_error(req, -ret, 0, true)) {
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
|
|
block_acct_done(blk_get_stats(s->blk), &req->acct);
|
|
virtio_blk_free_request(req);
|
|
|
|
out:
|
|
aio_context_release(blk_get_aio_context(s->conf.conf.blk));
|
|
}
|
|
|
|
static void virtio_blk_discard_write_zeroes_complete(void *opaque, int ret)
|
|
{
|
|
VirtIOBlockReq *req = opaque;
|
|
VirtIOBlock *s = req->dev;
|
|
bool is_write_zeroes = (virtio_ldl_p(VIRTIO_DEVICE(s), &req->out.type) &
|
|
~VIRTIO_BLK_T_BARRIER) == VIRTIO_BLK_T_WRITE_ZEROES;
|
|
|
|
aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
|
|
if (ret) {
|
|
if (virtio_blk_handle_rw_error(req, -ret, false, is_write_zeroes)) {
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
|
|
if (is_write_zeroes) {
|
|
block_acct_done(blk_get_stats(s->blk), &req->acct);
|
|
}
|
|
virtio_blk_free_request(req);
|
|
|
|
out:
|
|
aio_context_release(blk_get_aio_context(s->conf.conf.blk));
|
|
}
|
|
|
|
#ifdef __linux__
|
|
|
|
typedef struct {
|
|
VirtIOBlockReq *req;
|
|
struct sg_io_hdr hdr;
|
|
} VirtIOBlockIoctlReq;
|
|
|
|
static void virtio_blk_ioctl_complete(void *opaque, int status)
|
|
{
|
|
VirtIOBlockIoctlReq *ioctl_req = opaque;
|
|
VirtIOBlockReq *req = ioctl_req->req;
|
|
VirtIOBlock *s = req->dev;
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(s);
|
|
struct virtio_scsi_inhdr *scsi;
|
|
struct sg_io_hdr *hdr;
|
|
|
|
scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base;
|
|
|
|
if (status) {
|
|
status = VIRTIO_BLK_S_UNSUPP;
|
|
virtio_stl_p(vdev, &scsi->errors, 255);
|
|
goto out;
|
|
}
|
|
|
|
hdr = &ioctl_req->hdr;
|
|
/*
|
|
* From SCSI-Generic-HOWTO: "Some lower level drivers (e.g. ide-scsi)
|
|
* clear the masked_status field [hence status gets cleared too, see
|
|
* block/scsi_ioctl.c] even when a CHECK_CONDITION or COMMAND_TERMINATED
|
|
* status has occurred. However they do set DRIVER_SENSE in driver_status
|
|
* field. Also a (sb_len_wr > 0) indicates there is a sense buffer.
|
|
*/
|
|
if (hdr->status == 0 && hdr->sb_len_wr > 0) {
|
|
hdr->status = CHECK_CONDITION;
|
|
}
|
|
|
|
virtio_stl_p(vdev, &scsi->errors,
|
|
hdr->status | (hdr->msg_status << 8) |
|
|
(hdr->host_status << 16) | (hdr->driver_status << 24));
|
|
virtio_stl_p(vdev, &scsi->residual, hdr->resid);
|
|
virtio_stl_p(vdev, &scsi->sense_len, hdr->sb_len_wr);
|
|
virtio_stl_p(vdev, &scsi->data_len, hdr->dxfer_len);
|
|
|
|
out:
|
|
aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
|
|
virtio_blk_req_complete(req, status);
|
|
virtio_blk_free_request(req);
|
|
aio_context_release(blk_get_aio_context(s->conf.conf.blk));
|
|
g_free(ioctl_req);
|
|
}
|
|
|
|
#endif
|
|
|
|
static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s, VirtQueue *vq)
|
|
{
|
|
VirtIOBlockReq *req = virtqueue_pop(vq, sizeof(VirtIOBlockReq));
|
|
|
|
if (req) {
|
|
virtio_blk_init_request(s, vq, req);
|
|
}
|
|
return req;
|
|
}
|
|
|
|
static int virtio_blk_handle_scsi_req(VirtIOBlockReq *req)
|
|
{
|
|
int status = VIRTIO_BLK_S_OK;
|
|
struct virtio_scsi_inhdr *scsi = NULL;
|
|
VirtIOBlock *blk = req->dev;
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(blk);
|
|
VirtQueueElement *elem = &req->elem;
|
|
|
|
#ifdef __linux__
|
|
int i;
|
|
VirtIOBlockIoctlReq *ioctl_req;
|
|
BlockAIOCB *acb;
|
|
#endif
|
|
|
|
/*
|
|
* We require at least one output segment each for the virtio_blk_outhdr
|
|
* and the SCSI command block.
|
|
*
|
|
* We also at least require the virtio_blk_inhdr, the virtio_scsi_inhdr
|
|
* and the sense buffer pointer in the input segments.
|
|
*/
|
|
if (elem->out_num < 2 || elem->in_num < 3) {
|
|
status = VIRTIO_BLK_S_IOERR;
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* The scsi inhdr is placed in the second-to-last input segment, just
|
|
* before the regular inhdr.
|
|
*/
|
|
scsi = (void *)elem->in_sg[elem->in_num - 2].iov_base;
|
|
|
|
if (!virtio_has_feature(blk->host_features, VIRTIO_BLK_F_SCSI)) {
|
|
status = VIRTIO_BLK_S_UNSUPP;
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* No support for bidirection commands yet.
|
|
*/
|
|
if (elem->out_num > 2 && elem->in_num > 3) {
|
|
status = VIRTIO_BLK_S_UNSUPP;
|
|
goto fail;
|
|
}
|
|
|
|
#ifdef __linux__
|
|
ioctl_req = g_new0(VirtIOBlockIoctlReq, 1);
|
|
ioctl_req->req = req;
|
|
ioctl_req->hdr.interface_id = 'S';
|
|
ioctl_req->hdr.cmd_len = elem->out_sg[1].iov_len;
|
|
ioctl_req->hdr.cmdp = elem->out_sg[1].iov_base;
|
|
ioctl_req->hdr.dxfer_len = 0;
|
|
|
|
if (elem->out_num > 2) {
|
|
/*
|
|
* If there are more than the minimally required 2 output segments
|
|
* there is write payload starting from the third iovec.
|
|
*/
|
|
ioctl_req->hdr.dxfer_direction = SG_DXFER_TO_DEV;
|
|
ioctl_req->hdr.iovec_count = elem->out_num - 2;
|
|
|
|
for (i = 0; i < ioctl_req->hdr.iovec_count; i++) {
|
|
ioctl_req->hdr.dxfer_len += elem->out_sg[i + 2].iov_len;
|
|
}
|
|
|
|
ioctl_req->hdr.dxferp = elem->out_sg + 2;
|
|
|
|
} else if (elem->in_num > 3) {
|
|
/*
|
|
* If we have more than 3 input segments the guest wants to actually
|
|
* read data.
|
|
*/
|
|
ioctl_req->hdr.dxfer_direction = SG_DXFER_FROM_DEV;
|
|
ioctl_req->hdr.iovec_count = elem->in_num - 3;
|
|
for (i = 0; i < ioctl_req->hdr.iovec_count; i++) {
|
|
ioctl_req->hdr.dxfer_len += elem->in_sg[i].iov_len;
|
|
}
|
|
|
|
ioctl_req->hdr.dxferp = elem->in_sg;
|
|
} else {
|
|
/*
|
|
* Some SCSI commands don't actually transfer any data.
|
|
*/
|
|
ioctl_req->hdr.dxfer_direction = SG_DXFER_NONE;
|
|
}
|
|
|
|
ioctl_req->hdr.sbp = elem->in_sg[elem->in_num - 3].iov_base;
|
|
ioctl_req->hdr.mx_sb_len = elem->in_sg[elem->in_num - 3].iov_len;
|
|
|
|
acb = blk_aio_ioctl(blk->blk, SG_IO, &ioctl_req->hdr,
|
|
virtio_blk_ioctl_complete, ioctl_req);
|
|
if (!acb) {
|
|
g_free(ioctl_req);
|
|
status = VIRTIO_BLK_S_UNSUPP;
|
|
goto fail;
|
|
}
|
|
return -EINPROGRESS;
|
|
#else
|
|
abort();
|
|
#endif
|
|
|
|
fail:
|
|
/* Just put anything nonzero so that the ioctl fails in the guest. */
|
|
if (scsi) {
|
|
virtio_stl_p(vdev, &scsi->errors, 255);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static void virtio_blk_handle_scsi(VirtIOBlockReq *req)
|
|
{
|
|
int status;
|
|
|
|
status = virtio_blk_handle_scsi_req(req);
|
|
if (status != -EINPROGRESS) {
|
|
virtio_blk_req_complete(req, status);
|
|
virtio_blk_free_request(req);
|
|
}
|
|
}
|
|
|
|
static inline void submit_requests(BlockBackend *blk, MultiReqBuffer *mrb,
|
|
int start, int num_reqs, int niov)
|
|
{
|
|
QEMUIOVector *qiov = &mrb->reqs[start]->qiov;
|
|
int64_t sector_num = mrb->reqs[start]->sector_num;
|
|
bool is_write = mrb->is_write;
|
|
|
|
if (num_reqs > 1) {
|
|
int i;
|
|
struct iovec *tmp_iov = qiov->iov;
|
|
int tmp_niov = qiov->niov;
|
|
|
|
/* mrb->reqs[start]->qiov was initialized from external so we can't
|
|
* modify it here. We need to initialize it locally and then add the
|
|
* external iovecs. */
|
|
qemu_iovec_init(qiov, niov);
|
|
|
|
for (i = 0; i < tmp_niov; i++) {
|
|
qemu_iovec_add(qiov, tmp_iov[i].iov_base, tmp_iov[i].iov_len);
|
|
}
|
|
|
|
for (i = start + 1; i < start + num_reqs; i++) {
|
|
qemu_iovec_concat(qiov, &mrb->reqs[i]->qiov, 0,
|
|
mrb->reqs[i]->qiov.size);
|
|
mrb->reqs[i - 1]->mr_next = mrb->reqs[i];
|
|
}
|
|
|
|
trace_virtio_blk_submit_multireq(VIRTIO_DEVICE(mrb->reqs[start]->dev),
|
|
mrb, start, num_reqs,
|
|
sector_num << BDRV_SECTOR_BITS,
|
|
qiov->size, is_write);
|
|
block_acct_merge_done(blk_get_stats(blk),
|
|
is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ,
|
|
num_reqs - 1);
|
|
}
|
|
|
|
if (is_write) {
|
|
blk_aio_pwritev(blk, sector_num << BDRV_SECTOR_BITS, qiov, 0,
|
|
virtio_blk_rw_complete, mrb->reqs[start]);
|
|
} else {
|
|
blk_aio_preadv(blk, sector_num << BDRV_SECTOR_BITS, qiov, 0,
|
|
virtio_blk_rw_complete, mrb->reqs[start]);
|
|
}
|
|
}
|
|
|
|
static int multireq_compare(const void *a, const void *b)
|
|
{
|
|
const VirtIOBlockReq *req1 = *(VirtIOBlockReq **)a,
|
|
*req2 = *(VirtIOBlockReq **)b;
|
|
|
|
/*
|
|
* Note that we can't simply subtract sector_num1 from sector_num2
|
|
* here as that could overflow the return value.
|
|
*/
|
|
if (req1->sector_num > req2->sector_num) {
|
|
return 1;
|
|
} else if (req1->sector_num < req2->sector_num) {
|
|
return -1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb)
|
|
{
|
|
int i = 0, start = 0, num_reqs = 0, niov = 0, nb_sectors = 0;
|
|
uint32_t max_transfer;
|
|
int64_t sector_num = 0;
|
|
|
|
if (mrb->num_reqs == 1) {
|
|
submit_requests(blk, mrb, 0, 1, -1);
|
|
mrb->num_reqs = 0;
|
|
return;
|
|
}
|
|
|
|
max_transfer = blk_get_max_transfer(mrb->reqs[0]->dev->blk);
|
|
|
|
qsort(mrb->reqs, mrb->num_reqs, sizeof(*mrb->reqs),
|
|
&multireq_compare);
|
|
|
|
for (i = 0; i < mrb->num_reqs; i++) {
|
|
VirtIOBlockReq *req = mrb->reqs[i];
|
|
if (num_reqs > 0) {
|
|
/*
|
|
* NOTE: We cannot merge the requests in below situations:
|
|
* 1. requests are not sequential
|
|
* 2. merge would exceed maximum number of IOVs
|
|
* 3. merge would exceed maximum transfer length of backend device
|
|
*/
|
|
if (sector_num + nb_sectors != req->sector_num ||
|
|
niov > blk_get_max_iov(blk) - req->qiov.niov ||
|
|
req->qiov.size > max_transfer ||
|
|
nb_sectors > (max_transfer -
|
|
req->qiov.size) / BDRV_SECTOR_SIZE) {
|
|
submit_requests(blk, mrb, start, num_reqs, niov);
|
|
num_reqs = 0;
|
|
}
|
|
}
|
|
|
|
if (num_reqs == 0) {
|
|
sector_num = req->sector_num;
|
|
nb_sectors = niov = 0;
|
|
start = i;
|
|
}
|
|
|
|
nb_sectors += req->qiov.size / BDRV_SECTOR_SIZE;
|
|
niov += req->qiov.niov;
|
|
num_reqs++;
|
|
}
|
|
|
|
submit_requests(blk, mrb, start, num_reqs, niov);
|
|
mrb->num_reqs = 0;
|
|
}
|
|
|
|
static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb)
|
|
{
|
|
VirtIOBlock *s = req->dev;
|
|
|
|
block_acct_start(blk_get_stats(s->blk), &req->acct, 0,
|
|
BLOCK_ACCT_FLUSH);
|
|
|
|
/*
|
|
* Make sure all outstanding writes are posted to the backing device.
|
|
*/
|
|
if (mrb->is_write && mrb->num_reqs > 0) {
|
|
virtio_blk_submit_multireq(s->blk, mrb);
|
|
}
|
|
blk_aio_flush(s->blk, virtio_blk_flush_complete, req);
|
|
}
|
|
|
|
static bool virtio_blk_sect_range_ok(VirtIOBlock *dev,
|
|
uint64_t sector, size_t size)
|
|
{
|
|
uint64_t nb_sectors = size >> BDRV_SECTOR_BITS;
|
|
uint64_t total_sectors;
|
|
|
|
if (nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
|
|
return false;
|
|
}
|
|
if (sector & dev->sector_mask) {
|
|
return false;
|
|
}
|
|
if (size % dev->conf.conf.logical_block_size) {
|
|
return false;
|
|
}
|
|
blk_get_geometry(dev->blk, &total_sectors);
|
|
if (sector > total_sectors || nb_sectors > total_sectors - sector) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static uint8_t virtio_blk_handle_discard_write_zeroes(VirtIOBlockReq *req,
|
|
struct virtio_blk_discard_write_zeroes *dwz_hdr, bool is_write_zeroes)
|
|
{
|
|
VirtIOBlock *s = req->dev;
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(s);
|
|
uint64_t sector;
|
|
uint32_t num_sectors, flags, max_sectors;
|
|
uint8_t err_status;
|
|
int bytes;
|
|
|
|
sector = virtio_ldq_p(vdev, &dwz_hdr->sector);
|
|
num_sectors = virtio_ldl_p(vdev, &dwz_hdr->num_sectors);
|
|
flags = virtio_ldl_p(vdev, &dwz_hdr->flags);
|
|
max_sectors = is_write_zeroes ? s->conf.max_write_zeroes_sectors :
|
|
s->conf.max_discard_sectors;
|
|
|
|
/*
|
|
* max_sectors is at most BDRV_REQUEST_MAX_SECTORS, this check
|
|
* make us sure that "num_sectors << BDRV_SECTOR_BITS" can fit in
|
|
* the integer variable.
|
|
*/
|
|
if (unlikely(num_sectors > max_sectors)) {
|
|
err_status = VIRTIO_BLK_S_IOERR;
|
|
goto err;
|
|
}
|
|
|
|
bytes = num_sectors << BDRV_SECTOR_BITS;
|
|
|
|
if (unlikely(!virtio_blk_sect_range_ok(s, sector, bytes))) {
|
|
err_status = VIRTIO_BLK_S_IOERR;
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for discard
|
|
* and write zeroes commands if any unknown flag is set.
|
|
*/
|
|
if (unlikely(flags & ~VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) {
|
|
err_status = VIRTIO_BLK_S_UNSUPP;
|
|
goto err;
|
|
}
|
|
|
|
if (is_write_zeroes) { /* VIRTIO_BLK_T_WRITE_ZEROES */
|
|
int blk_aio_flags = 0;
|
|
|
|
if (flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP) {
|
|
blk_aio_flags |= BDRV_REQ_MAY_UNMAP;
|
|
}
|
|
|
|
block_acct_start(blk_get_stats(s->blk), &req->acct, bytes,
|
|
BLOCK_ACCT_WRITE);
|
|
|
|
blk_aio_pwrite_zeroes(s->blk, sector << BDRV_SECTOR_BITS,
|
|
bytes, blk_aio_flags,
|
|
virtio_blk_discard_write_zeroes_complete, req);
|
|
} else { /* VIRTIO_BLK_T_DISCARD */
|
|
/*
|
|
* The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for
|
|
* discard commands if the unmap flag is set.
|
|
*/
|
|
if (unlikely(flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) {
|
|
err_status = VIRTIO_BLK_S_UNSUPP;
|
|
goto err;
|
|
}
|
|
|
|
blk_aio_pdiscard(s->blk, sector << BDRV_SECTOR_BITS, bytes,
|
|
virtio_blk_discard_write_zeroes_complete, req);
|
|
}
|
|
|
|
return VIRTIO_BLK_S_OK;
|
|
|
|
err:
|
|
if (is_write_zeroes) {
|
|
block_acct_invalid(blk_get_stats(s->blk), BLOCK_ACCT_WRITE);
|
|
}
|
|
return err_status;
|
|
}
|
|
|
|
static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb)
|
|
{
|
|
uint32_t type;
|
|
struct iovec *in_iov = req->elem.in_sg;
|
|
struct iovec *out_iov = req->elem.out_sg;
|
|
unsigned in_num = req->elem.in_num;
|
|
unsigned out_num = req->elem.out_num;
|
|
VirtIOBlock *s = req->dev;
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(s);
|
|
|
|
if (req->elem.out_num < 1 || req->elem.in_num < 1) {
|
|
virtio_error(vdev, "virtio-blk missing headers");
|
|
return -1;
|
|
}
|
|
|
|
if (unlikely(iov_to_buf(out_iov, out_num, 0, &req->out,
|
|
sizeof(req->out)) != sizeof(req->out))) {
|
|
virtio_error(vdev, "virtio-blk request outhdr too short");
|
|
return -1;
|
|
}
|
|
|
|
iov_discard_front_undoable(&out_iov, &out_num, sizeof(req->out),
|
|
&req->outhdr_undo);
|
|
|
|
if (in_iov[in_num - 1].iov_len < sizeof(struct virtio_blk_inhdr)) {
|
|
virtio_error(vdev, "virtio-blk request inhdr too short");
|
|
iov_discard_undo(&req->outhdr_undo);
|
|
return -1;
|
|
}
|
|
|
|
/* We always touch the last byte, so just see how big in_iov is. */
|
|
req->in_len = iov_size(in_iov, in_num);
|
|
req->in = (void *)in_iov[in_num - 1].iov_base
|
|
+ in_iov[in_num - 1].iov_len
|
|
- sizeof(struct virtio_blk_inhdr);
|
|
iov_discard_back_undoable(in_iov, &in_num, sizeof(struct virtio_blk_inhdr),
|
|
&req->inhdr_undo);
|
|
|
|
type = virtio_ldl_p(vdev, &req->out.type);
|
|
|
|
/* VIRTIO_BLK_T_OUT defines the command direction. VIRTIO_BLK_T_BARRIER
|
|
* is an optional flag. Although a guest should not send this flag if
|
|
* not negotiated we ignored it in the past. So keep ignoring it. */
|
|
switch (type & ~(VIRTIO_BLK_T_OUT | VIRTIO_BLK_T_BARRIER)) {
|
|
case VIRTIO_BLK_T_IN:
|
|
{
|
|
bool is_write = type & VIRTIO_BLK_T_OUT;
|
|
req->sector_num = virtio_ldq_p(vdev, &req->out.sector);
|
|
|
|
if (is_write) {
|
|
qemu_iovec_init_external(&req->qiov, out_iov, out_num);
|
|
trace_virtio_blk_handle_write(vdev, req, req->sector_num,
|
|
req->qiov.size / BDRV_SECTOR_SIZE);
|
|
} else {
|
|
qemu_iovec_init_external(&req->qiov, in_iov, in_num);
|
|
trace_virtio_blk_handle_read(vdev, req, req->sector_num,
|
|
req->qiov.size / BDRV_SECTOR_SIZE);
|
|
}
|
|
|
|
if (!virtio_blk_sect_range_ok(s, req->sector_num, req->qiov.size)) {
|
|
virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
|
|
block_acct_invalid(blk_get_stats(s->blk),
|
|
is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ);
|
|
virtio_blk_free_request(req);
|
|
return 0;
|
|
}
|
|
|
|
block_acct_start(blk_get_stats(s->blk), &req->acct, req->qiov.size,
|
|
is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ);
|
|
|
|
/* merge would exceed maximum number of requests or IO direction
|
|
* changes */
|
|
if (mrb->num_reqs > 0 && (mrb->num_reqs == VIRTIO_BLK_MAX_MERGE_REQS ||
|
|
is_write != mrb->is_write ||
|
|
!s->conf.request_merging)) {
|
|
virtio_blk_submit_multireq(s->blk, mrb);
|
|
}
|
|
|
|
assert(mrb->num_reqs < VIRTIO_BLK_MAX_MERGE_REQS);
|
|
mrb->reqs[mrb->num_reqs++] = req;
|
|
mrb->is_write = is_write;
|
|
break;
|
|
}
|
|
case VIRTIO_BLK_T_FLUSH:
|
|
virtio_blk_handle_flush(req, mrb);
|
|
break;
|
|
case VIRTIO_BLK_T_SCSI_CMD:
|
|
virtio_blk_handle_scsi(req);
|
|
break;
|
|
case VIRTIO_BLK_T_GET_ID:
|
|
{
|
|
/*
|
|
* NB: per existing s/n string convention the string is
|
|
* terminated by '\0' only when shorter than buffer.
|
|
*/
|
|
const char *serial = s->conf.serial ? s->conf.serial : "";
|
|
size_t size = MIN(strlen(serial) + 1,
|
|
MIN(iov_size(in_iov, in_num),
|
|
VIRTIO_BLK_ID_BYTES));
|
|
iov_from_buf(in_iov, in_num, 0, serial, size);
|
|
virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
|
|
virtio_blk_free_request(req);
|
|
break;
|
|
}
|
|
/*
|
|
* VIRTIO_BLK_T_DISCARD and VIRTIO_BLK_T_WRITE_ZEROES are defined with
|
|
* VIRTIO_BLK_T_OUT flag set. We masked this flag in the switch statement,
|
|
* so we must mask it for these requests, then we will check if it is set.
|
|
*/
|
|
case VIRTIO_BLK_T_DISCARD & ~VIRTIO_BLK_T_OUT:
|
|
case VIRTIO_BLK_T_WRITE_ZEROES & ~VIRTIO_BLK_T_OUT:
|
|
{
|
|
struct virtio_blk_discard_write_zeroes dwz_hdr;
|
|
size_t out_len = iov_size(out_iov, out_num);
|
|
bool is_write_zeroes = (type & ~VIRTIO_BLK_T_BARRIER) ==
|
|
VIRTIO_BLK_T_WRITE_ZEROES;
|
|
uint8_t err_status;
|
|
|
|
/*
|
|
* Unsupported if VIRTIO_BLK_T_OUT is not set or the request contains
|
|
* more than one segment.
|
|
*/
|
|
if (unlikely(!(type & VIRTIO_BLK_T_OUT) ||
|
|
out_len > sizeof(dwz_hdr))) {
|
|
virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
|
|
virtio_blk_free_request(req);
|
|
return 0;
|
|
}
|
|
|
|
if (unlikely(iov_to_buf(out_iov, out_num, 0, &dwz_hdr,
|
|
sizeof(dwz_hdr)) != sizeof(dwz_hdr))) {
|
|
iov_discard_undo(&req->inhdr_undo);
|
|
iov_discard_undo(&req->outhdr_undo);
|
|
virtio_error(vdev, "virtio-blk discard/write_zeroes header"
|
|
" too short");
|
|
return -1;
|
|
}
|
|
|
|
err_status = virtio_blk_handle_discard_write_zeroes(req, &dwz_hdr,
|
|
is_write_zeroes);
|
|
if (err_status != VIRTIO_BLK_S_OK) {
|
|
virtio_blk_req_complete(req, err_status);
|
|
virtio_blk_free_request(req);
|
|
}
|
|
|
|
break;
|
|
}
|
|
default:
|
|
virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
|
|
virtio_blk_free_request(req);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
bool virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq)
|
|
{
|
|
VirtIOBlockReq *req;
|
|
MultiReqBuffer mrb = {};
|
|
bool suppress_notifications = virtio_queue_get_notification(vq);
|
|
bool progress = false;
|
|
|
|
aio_context_acquire(blk_get_aio_context(s->blk));
|
|
blk_io_plug(s->blk);
|
|
|
|
do {
|
|
if (suppress_notifications) {
|
|
virtio_queue_set_notification(vq, 0);
|
|
}
|
|
|
|
while ((req = virtio_blk_get_request(s, vq))) {
|
|
progress = true;
|
|
if (virtio_blk_handle_request(req, &mrb)) {
|
|
virtqueue_detach_element(req->vq, &req->elem, 0);
|
|
virtio_blk_free_request(req);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (suppress_notifications) {
|
|
virtio_queue_set_notification(vq, 1);
|
|
}
|
|
} while (!virtio_queue_empty(vq));
|
|
|
|
if (mrb.num_reqs) {
|
|
virtio_blk_submit_multireq(s->blk, &mrb);
|
|
}
|
|
|
|
blk_io_unplug(s->blk);
|
|
aio_context_release(blk_get_aio_context(s->blk));
|
|
return progress;
|
|
}
|
|
|
|
static void virtio_blk_handle_output_do(VirtIOBlock *s, VirtQueue *vq)
|
|
{
|
|
virtio_blk_handle_vq(s, vq);
|
|
}
|
|
|
|
static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
VirtIOBlock *s = (VirtIOBlock *)vdev;
|
|
|
|
if (s->dataplane) {
|
|
/* Some guests kick before setting VIRTIO_CONFIG_S_DRIVER_OK so start
|
|
* dataplane here instead of waiting for .set_status().
|
|
*/
|
|
virtio_device_start_ioeventfd(vdev);
|
|
if (!s->dataplane_disabled) {
|
|
return;
|
|
}
|
|
}
|
|
virtio_blk_handle_output_do(s, vq);
|
|
}
|
|
|
|
void virtio_blk_process_queued_requests(VirtIOBlock *s, bool is_bh)
|
|
{
|
|
VirtIOBlockReq *req = s->rq;
|
|
MultiReqBuffer mrb = {};
|
|
|
|
s->rq = NULL;
|
|
|
|
aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
|
|
while (req) {
|
|
VirtIOBlockReq *next = req->next;
|
|
if (virtio_blk_handle_request(req, &mrb)) {
|
|
/* Device is now broken and won't do any processing until it gets
|
|
* reset. Already queued requests will be lost: let's purge them.
|
|
*/
|
|
while (req) {
|
|
next = req->next;
|
|
virtqueue_detach_element(req->vq, &req->elem, 0);
|
|
virtio_blk_free_request(req);
|
|
req = next;
|
|
}
|
|
break;
|
|
}
|
|
req = next;
|
|
}
|
|
|
|
if (mrb.num_reqs) {
|
|
virtio_blk_submit_multireq(s->blk, &mrb);
|
|
}
|
|
if (is_bh) {
|
|
blk_dec_in_flight(s->conf.conf.blk);
|
|
}
|
|
aio_context_release(blk_get_aio_context(s->conf.conf.blk));
|
|
}
|
|
|
|
static void virtio_blk_dma_restart_bh(void *opaque)
|
|
{
|
|
VirtIOBlock *s = opaque;
|
|
|
|
qemu_bh_delete(s->bh);
|
|
s->bh = NULL;
|
|
|
|
virtio_blk_process_queued_requests(s, true);
|
|
}
|
|
|
|
static void virtio_blk_dma_restart_cb(void *opaque, int running,
|
|
RunState state)
|
|
{
|
|
VirtIOBlock *s = opaque;
|
|
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(s)));
|
|
VirtioBusState *bus = VIRTIO_BUS(qbus);
|
|
|
|
if (!running) {
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If ioeventfd is enabled, don't schedule the BH here as queued
|
|
* requests will be processed while starting the data plane.
|
|
*/
|
|
if (!s->bh && !virtio_bus_ioeventfd_enabled(bus)) {
|
|
s->bh = aio_bh_new(blk_get_aio_context(s->conf.conf.blk),
|
|
virtio_blk_dma_restart_bh, s);
|
|
blk_inc_in_flight(s->conf.conf.blk);
|
|
qemu_bh_schedule(s->bh);
|
|
}
|
|
}
|
|
|
|
static void virtio_blk_reset(VirtIODevice *vdev)
|
|
{
|
|
VirtIOBlock *s = VIRTIO_BLK(vdev);
|
|
AioContext *ctx;
|
|
VirtIOBlockReq *req;
|
|
|
|
ctx = blk_get_aio_context(s->blk);
|
|
aio_context_acquire(ctx);
|
|
blk_drain(s->blk);
|
|
|
|
/* We drop queued requests after blk_drain() because blk_drain() itself can
|
|
* produce them. */
|
|
while (s->rq) {
|
|
req = s->rq;
|
|
s->rq = req->next;
|
|
virtqueue_detach_element(req->vq, &req->elem, 0);
|
|
virtio_blk_free_request(req);
|
|
}
|
|
|
|
aio_context_release(ctx);
|
|
|
|
assert(!s->dataplane_started);
|
|
blk_set_enable_write_cache(s->blk, s->original_wce);
|
|
}
|
|
|
|
/* coalesce internal state, copy to pci i/o region 0
|
|
*/
|
|
static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config)
|
|
{
|
|
VirtIOBlock *s = VIRTIO_BLK(vdev);
|
|
BlockConf *conf = &s->conf.conf;
|
|
struct virtio_blk_config blkcfg;
|
|
uint64_t capacity;
|
|
int64_t length;
|
|
int blk_size = conf->logical_block_size;
|
|
|
|
blk_get_geometry(s->blk, &capacity);
|
|
memset(&blkcfg, 0, sizeof(blkcfg));
|
|
virtio_stq_p(vdev, &blkcfg.capacity, capacity);
|
|
virtio_stl_p(vdev, &blkcfg.seg_max,
|
|
s->conf.seg_max_adjust ? s->conf.queue_size - 2 : 128 - 2);
|
|
virtio_stw_p(vdev, &blkcfg.geometry.cylinders, conf->cyls);
|
|
virtio_stl_p(vdev, &blkcfg.blk_size, blk_size);
|
|
virtio_stw_p(vdev, &blkcfg.min_io_size, conf->min_io_size / blk_size);
|
|
virtio_stl_p(vdev, &blkcfg.opt_io_size, conf->opt_io_size / blk_size);
|
|
blkcfg.geometry.heads = conf->heads;
|
|
/*
|
|
* We must ensure that the block device capacity is a multiple of
|
|
* the logical block size. If that is not the case, let's use
|
|
* sector_mask to adopt the geometry to have a correct picture.
|
|
* For those devices where the capacity is ok for the given geometry
|
|
* we don't touch the sector value of the geometry, since some devices
|
|
* (like s390 dasd) need a specific value. Here the capacity is already
|
|
* cyls*heads*secs*blk_size and the sector value is not block size
|
|
* divided by 512 - instead it is the amount of blk_size blocks
|
|
* per track (cylinder).
|
|
*/
|
|
length = blk_getlength(s->blk);
|
|
if (length > 0 && length / conf->heads / conf->secs % blk_size) {
|
|
blkcfg.geometry.sectors = conf->secs & ~s->sector_mask;
|
|
} else {
|
|
blkcfg.geometry.sectors = conf->secs;
|
|
}
|
|
blkcfg.size_max = 0;
|
|
blkcfg.physical_block_exp = get_physical_block_exp(conf);
|
|
blkcfg.alignment_offset = 0;
|
|
blkcfg.wce = blk_enable_write_cache(s->blk);
|
|
virtio_stw_p(vdev, &blkcfg.num_queues, s->conf.num_queues);
|
|
if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD)) {
|
|
virtio_stl_p(vdev, &blkcfg.max_discard_sectors,
|
|
s->conf.max_discard_sectors);
|
|
virtio_stl_p(vdev, &blkcfg.discard_sector_alignment,
|
|
blk_size >> BDRV_SECTOR_BITS);
|
|
/*
|
|
* We support only one segment per request since multiple segments
|
|
* are not widely used and there are no userspace APIs that allow
|
|
* applications to submit multiple segments in a single call.
|
|
*/
|
|
virtio_stl_p(vdev, &blkcfg.max_discard_seg, 1);
|
|
}
|
|
if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_WRITE_ZEROES)) {
|
|
virtio_stl_p(vdev, &blkcfg.max_write_zeroes_sectors,
|
|
s->conf.max_write_zeroes_sectors);
|
|
blkcfg.write_zeroes_may_unmap = 1;
|
|
virtio_stl_p(vdev, &blkcfg.max_write_zeroes_seg, 1);
|
|
}
|
|
memcpy(config, &blkcfg, s->config_size);
|
|
}
|
|
|
|
static void virtio_blk_set_config(VirtIODevice *vdev, const uint8_t *config)
|
|
{
|
|
VirtIOBlock *s = VIRTIO_BLK(vdev);
|
|
struct virtio_blk_config blkcfg;
|
|
|
|
memcpy(&blkcfg, config, s->config_size);
|
|
|
|
aio_context_acquire(blk_get_aio_context(s->blk));
|
|
blk_set_enable_write_cache(s->blk, blkcfg.wce != 0);
|
|
aio_context_release(blk_get_aio_context(s->blk));
|
|
}
|
|
|
|
static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features,
|
|
Error **errp)
|
|
{
|
|
VirtIOBlock *s = VIRTIO_BLK(vdev);
|
|
|
|
/* Firstly sync all virtio-blk possible supported features */
|
|
features |= s->host_features;
|
|
|
|
virtio_add_feature(&features, VIRTIO_BLK_F_SEG_MAX);
|
|
virtio_add_feature(&features, VIRTIO_BLK_F_GEOMETRY);
|
|
virtio_add_feature(&features, VIRTIO_BLK_F_TOPOLOGY);
|
|
virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE);
|
|
if (virtio_has_feature(features, VIRTIO_F_VERSION_1)) {
|
|
if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_SCSI)) {
|
|
error_setg(errp, "Please set scsi=off for virtio-blk devices in order to use virtio 1.0");
|
|
return 0;
|
|
}
|
|
} else {
|
|
virtio_clear_feature(&features, VIRTIO_F_ANY_LAYOUT);
|
|
virtio_add_feature(&features, VIRTIO_BLK_F_SCSI);
|
|
}
|
|
|
|
if (blk_enable_write_cache(s->blk) ||
|
|
(s->conf.x_enable_wce_if_config_wce &&
|
|
virtio_has_feature(features, VIRTIO_BLK_F_CONFIG_WCE))) {
|
|
virtio_add_feature(&features, VIRTIO_BLK_F_WCE);
|
|
}
|
|
if (blk_is_read_only(s->blk)) {
|
|
virtio_add_feature(&features, VIRTIO_BLK_F_RO);
|
|
}
|
|
if (s->conf.num_queues > 1) {
|
|
virtio_add_feature(&features, VIRTIO_BLK_F_MQ);
|
|
}
|
|
|
|
return features;
|
|
}
|
|
|
|
static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status)
|
|
{
|
|
VirtIOBlock *s = VIRTIO_BLK(vdev);
|
|
|
|
if (!(status & (VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK))) {
|
|
assert(!s->dataplane_started);
|
|
}
|
|
|
|
if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
|
return;
|
|
}
|
|
|
|
/* A guest that supports VIRTIO_BLK_F_CONFIG_WCE must be able to send
|
|
* cache flushes. Thus, the "auto writethrough" behavior is never
|
|
* necessary for guests that support the VIRTIO_BLK_F_CONFIG_WCE feature.
|
|
* Leaving it enabled would break the following sequence:
|
|
*
|
|
* Guest started with "-drive cache=writethrough"
|
|
* Guest sets status to 0
|
|
* Guest sets DRIVER bit in status field
|
|
* Guest reads host features (WCE=0, CONFIG_WCE=1)
|
|
* Guest writes guest features (WCE=0, CONFIG_WCE=1)
|
|
* Guest writes 1 to the WCE configuration field (writeback mode)
|
|
* Guest sets DRIVER_OK bit in status field
|
|
*
|
|
* s->blk would erroneously be placed in writethrough mode.
|
|
*/
|
|
if (!virtio_vdev_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) {
|
|
aio_context_acquire(blk_get_aio_context(s->blk));
|
|
blk_set_enable_write_cache(s->blk,
|
|
virtio_vdev_has_feature(vdev,
|
|
VIRTIO_BLK_F_WCE));
|
|
aio_context_release(blk_get_aio_context(s->blk));
|
|
}
|
|
}
|
|
|
|
static void virtio_blk_save_device(VirtIODevice *vdev, QEMUFile *f)
|
|
{
|
|
VirtIOBlock *s = VIRTIO_BLK(vdev);
|
|
VirtIOBlockReq *req = s->rq;
|
|
|
|
while (req) {
|
|
qemu_put_sbyte(f, 1);
|
|
|
|
if (s->conf.num_queues > 1) {
|
|
qemu_put_be32(f, virtio_get_queue_index(req->vq));
|
|
}
|
|
|
|
qemu_put_virtqueue_element(vdev, f, &req->elem);
|
|
req = req->next;
|
|
}
|
|
qemu_put_sbyte(f, 0);
|
|
}
|
|
|
|
static int virtio_blk_load_device(VirtIODevice *vdev, QEMUFile *f,
|
|
int version_id)
|
|
{
|
|
VirtIOBlock *s = VIRTIO_BLK(vdev);
|
|
|
|
while (qemu_get_sbyte(f)) {
|
|
unsigned nvqs = s->conf.num_queues;
|
|
unsigned vq_idx = 0;
|
|
VirtIOBlockReq *req;
|
|
|
|
if (nvqs > 1) {
|
|
vq_idx = qemu_get_be32(f);
|
|
|
|
if (vq_idx >= nvqs) {
|
|
error_report("Invalid virtqueue index in request list: %#x",
|
|
vq_idx);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
req = qemu_get_virtqueue_element(vdev, f, sizeof(VirtIOBlockReq));
|
|
virtio_blk_init_request(s, virtio_get_queue(vdev, vq_idx), req);
|
|
req->next = s->rq;
|
|
s->rq = req;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void virtio_resize_cb(void *opaque)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
|
|
assert(qemu_get_current_aio_context() == qemu_get_aio_context());
|
|
virtio_notify_config(vdev);
|
|
}
|
|
|
|
static void virtio_blk_resize(void *opaque)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
|
|
|
|
/*
|
|
* virtio_notify_config() needs to acquire the global mutex,
|
|
* so it can't be called from an iothread. Instead, schedule
|
|
* it to be run in the main context BH.
|
|
*/
|
|
aio_bh_schedule_oneshot(qemu_get_aio_context(), virtio_resize_cb, vdev);
|
|
}
|
|
|
|
static const BlockDevOps virtio_block_ops = {
|
|
.resize_cb = virtio_blk_resize,
|
|
};
|
|
|
|
static void virtio_blk_device_realize(DeviceState *dev, Error **errp)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VirtIOBlock *s = VIRTIO_BLK(dev);
|
|
VirtIOBlkConf *conf = &s->conf;
|
|
Error *err = NULL;
|
|
unsigned i;
|
|
|
|
if (!conf->conf.blk) {
|
|
error_setg(errp, "drive property not set");
|
|
return;
|
|
}
|
|
if (!blk_is_inserted(conf->conf.blk)) {
|
|
error_setg(errp, "Device needs media, but drive is empty");
|
|
return;
|
|
}
|
|
if (conf->num_queues == VIRTIO_BLK_AUTO_NUM_QUEUES) {
|
|
conf->num_queues = 1;
|
|
}
|
|
if (!conf->num_queues) {
|
|
error_setg(errp, "num-queues property must be larger than 0");
|
|
return;
|
|
}
|
|
if (conf->queue_size <= 2) {
|
|
error_setg(errp, "invalid queue-size property (%" PRIu16 "), "
|
|
"must be > 2", conf->queue_size);
|
|
return;
|
|
}
|
|
if (!is_power_of_2(conf->queue_size) ||
|
|
conf->queue_size > VIRTQUEUE_MAX_SIZE) {
|
|
error_setg(errp, "invalid queue-size property (%" PRIu16 "), "
|
|
"must be a power of 2 (max %d)",
|
|
conf->queue_size, VIRTQUEUE_MAX_SIZE);
|
|
return;
|
|
}
|
|
|
|
if (!blkconf_apply_backend_options(&conf->conf,
|
|
blk_is_read_only(conf->conf.blk), true,
|
|
errp)) {
|
|
return;
|
|
}
|
|
s->original_wce = blk_enable_write_cache(conf->conf.blk);
|
|
if (!blkconf_geometry(&conf->conf, NULL, 65535, 255, 255, errp)) {
|
|
return;
|
|
}
|
|
|
|
if (!blkconf_blocksizes(&conf->conf, errp)) {
|
|
return;
|
|
}
|
|
|
|
if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD) &&
|
|
(!conf->max_discard_sectors ||
|
|
conf->max_discard_sectors > BDRV_REQUEST_MAX_SECTORS)) {
|
|
error_setg(errp, "invalid max-discard-sectors property (%" PRIu32 ")"
|
|
", must be between 1 and %d",
|
|
conf->max_discard_sectors, (int)BDRV_REQUEST_MAX_SECTORS);
|
|
return;
|
|
}
|
|
|
|
if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_WRITE_ZEROES) &&
|
|
(!conf->max_write_zeroes_sectors ||
|
|
conf->max_write_zeroes_sectors > BDRV_REQUEST_MAX_SECTORS)) {
|
|
error_setg(errp, "invalid max-write-zeroes-sectors property (%" PRIu32
|
|
"), must be between 1 and %d",
|
|
conf->max_write_zeroes_sectors,
|
|
(int)BDRV_REQUEST_MAX_SECTORS);
|
|
return;
|
|
}
|
|
|
|
virtio_blk_set_config_size(s, s->host_features);
|
|
|
|
virtio_init(vdev, "virtio-blk", VIRTIO_ID_BLOCK, s->config_size);
|
|
|
|
s->blk = conf->conf.blk;
|
|
s->rq = NULL;
|
|
s->sector_mask = (s->conf.conf.logical_block_size / BDRV_SECTOR_SIZE) - 1;
|
|
|
|
for (i = 0; i < conf->num_queues; i++) {
|
|
virtio_add_queue(vdev, conf->queue_size, virtio_blk_handle_output);
|
|
}
|
|
virtio_blk_data_plane_create(vdev, conf, &s->dataplane, &err);
|
|
if (err != NULL) {
|
|
error_propagate(errp, err);
|
|
for (i = 0; i < conf->num_queues; i++) {
|
|
virtio_del_queue(vdev, i);
|
|
}
|
|
virtio_cleanup(vdev);
|
|
return;
|
|
}
|
|
|
|
s->change = qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s);
|
|
blk_set_dev_ops(s->blk, &virtio_block_ops, s);
|
|
blk_set_guest_block_size(s->blk, s->conf.conf.logical_block_size);
|
|
|
|
blk_iostatus_enable(s->blk);
|
|
|
|
add_boot_device_lchs(dev, "/disk@0,0",
|
|
conf->conf.lcyls,
|
|
conf->conf.lheads,
|
|
conf->conf.lsecs);
|
|
}
|
|
|
|
static void virtio_blk_device_unrealize(DeviceState *dev)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VirtIOBlock *s = VIRTIO_BLK(dev);
|
|
VirtIOBlkConf *conf = &s->conf;
|
|
unsigned i;
|
|
|
|
blk_drain(s->blk);
|
|
del_boot_device_lchs(dev, "/disk@0,0");
|
|
virtio_blk_data_plane_destroy(s->dataplane);
|
|
s->dataplane = NULL;
|
|
for (i = 0; i < conf->num_queues; i++) {
|
|
virtio_del_queue(vdev, i);
|
|
}
|
|
qemu_del_vm_change_state_handler(s->change);
|
|
blockdev_mark_auto_del(s->blk);
|
|
virtio_cleanup(vdev);
|
|
}
|
|
|
|
static void virtio_blk_instance_init(Object *obj)
|
|
{
|
|
VirtIOBlock *s = VIRTIO_BLK(obj);
|
|
|
|
device_add_bootindex_property(obj, &s->conf.conf.bootindex,
|
|
"bootindex", "/disk@0,0",
|
|
DEVICE(obj));
|
|
}
|
|
|
|
static const VMStateDescription vmstate_virtio_blk = {
|
|
.name = "virtio-blk",
|
|
.minimum_version_id = 2,
|
|
.version_id = 2,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_VIRTIO_DEVICE,
|
|
VMSTATE_END_OF_LIST()
|
|
},
|
|
};
|
|
|
|
static Property virtio_blk_properties[] = {
|
|
DEFINE_BLOCK_PROPERTIES(VirtIOBlock, conf.conf),
|
|
DEFINE_BLOCK_ERROR_PROPERTIES(VirtIOBlock, conf.conf),
|
|
DEFINE_BLOCK_CHS_PROPERTIES(VirtIOBlock, conf.conf),
|
|
DEFINE_PROP_STRING("serial", VirtIOBlock, conf.serial),
|
|
DEFINE_PROP_BIT64("config-wce", VirtIOBlock, host_features,
|
|
VIRTIO_BLK_F_CONFIG_WCE, true),
|
|
#ifdef __linux__
|
|
DEFINE_PROP_BIT64("scsi", VirtIOBlock, host_features,
|
|
VIRTIO_BLK_F_SCSI, false),
|
|
#endif
|
|
DEFINE_PROP_BIT("request-merging", VirtIOBlock, conf.request_merging, 0,
|
|
true),
|
|
DEFINE_PROP_UINT16("num-queues", VirtIOBlock, conf.num_queues,
|
|
VIRTIO_BLK_AUTO_NUM_QUEUES),
|
|
DEFINE_PROP_UINT16("queue-size", VirtIOBlock, conf.queue_size, 256),
|
|
DEFINE_PROP_BOOL("seg-max-adjust", VirtIOBlock, conf.seg_max_adjust, true),
|
|
DEFINE_PROP_LINK("iothread", VirtIOBlock, conf.iothread, TYPE_IOTHREAD,
|
|
IOThread *),
|
|
DEFINE_PROP_BIT64("discard", VirtIOBlock, host_features,
|
|
VIRTIO_BLK_F_DISCARD, true),
|
|
DEFINE_PROP_BIT64("write-zeroes", VirtIOBlock, host_features,
|
|
VIRTIO_BLK_F_WRITE_ZEROES, true),
|
|
DEFINE_PROP_UINT32("max-discard-sectors", VirtIOBlock,
|
|
conf.max_discard_sectors, BDRV_REQUEST_MAX_SECTORS),
|
|
DEFINE_PROP_UINT32("max-write-zeroes-sectors", VirtIOBlock,
|
|
conf.max_write_zeroes_sectors, BDRV_REQUEST_MAX_SECTORS),
|
|
DEFINE_PROP_BOOL("x-enable-wce-if-config-wce", VirtIOBlock,
|
|
conf.x_enable_wce_if_config_wce, true),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static void virtio_blk_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
|
|
|
|
device_class_set_props(dc, virtio_blk_properties);
|
|
dc->vmsd = &vmstate_virtio_blk;
|
|
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
|
|
vdc->realize = virtio_blk_device_realize;
|
|
vdc->unrealize = virtio_blk_device_unrealize;
|
|
vdc->get_config = virtio_blk_update_config;
|
|
vdc->set_config = virtio_blk_set_config;
|
|
vdc->get_features = virtio_blk_get_features;
|
|
vdc->set_status = virtio_blk_set_status;
|
|
vdc->reset = virtio_blk_reset;
|
|
vdc->save = virtio_blk_save_device;
|
|
vdc->load = virtio_blk_load_device;
|
|
vdc->start_ioeventfd = virtio_blk_data_plane_start;
|
|
vdc->stop_ioeventfd = virtio_blk_data_plane_stop;
|
|
}
|
|
|
|
static const TypeInfo virtio_blk_info = {
|
|
.name = TYPE_VIRTIO_BLK,
|
|
.parent = TYPE_VIRTIO_DEVICE,
|
|
.instance_size = sizeof(VirtIOBlock),
|
|
.instance_init = virtio_blk_instance_init,
|
|
.class_init = virtio_blk_class_init,
|
|
};
|
|
|
|
static void virtio_register_types(void)
|
|
{
|
|
type_register_static(&virtio_blk_info);
|
|
}
|
|
|
|
type_init(virtio_register_types)
|