cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

create.c (3406B)

      1/*
      2 * Block layer code related to image creation
      3 *
      4 * Copyright (c) 2018 Kevin Wolf <kwolf@redhat.com>
      5 *
      6 * Permission is hereby granted, free of charge, to any person obtaining a copy
      7 * of this software and associated documentation files (the "Software"), to deal
      8 * in the Software without restriction, including without limitation the rights
      9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     10 * copies of the Software, and to permit persons to whom the Software is
     11 * furnished to do so, subject to the following conditions:
     12 *
     13 * The above copyright notice and this permission notice shall be included in
     14 * all copies or substantial portions of the Software.
     15 *
     16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
     19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     22 * THE SOFTWARE.
     23 */
     24
     25#include "qemu/osdep.h"
     26#include "block/block_int.h"
     27#include "qemu/job.h"
     28#include "qemu/main-loop.h"
     29#include "qapi/qapi-commands-block-core.h"
     30#include "qapi/qapi-visit-block-core.h"
     31#include "qapi/clone-visitor.h"
     32#include "qapi/error.h"
     33
     34typedef struct BlockdevCreateJob {
     35    Job common;
     36    BlockDriver *drv;
     37    BlockdevCreateOptions *opts;
     38} BlockdevCreateJob;
     39
     40static int coroutine_fn blockdev_create_run(Job *job, Error **errp)
     41{
     42    BlockdevCreateJob *s = container_of(job, BlockdevCreateJob, common);
     43    int ret;
     44
     45    job_progress_set_remaining(&s->common, 1);
     46    ret = s->drv->bdrv_co_create(s->opts, errp);
     47    job_progress_update(&s->common, 1);
     48
     49    qapi_free_BlockdevCreateOptions(s->opts);
     50
     51    return ret;
     52}
     53
     54static const JobDriver blockdev_create_job_driver = {
     55    .instance_size = sizeof(BlockdevCreateJob),
     56    .job_type      = JOB_TYPE_CREATE,
     57    .run           = blockdev_create_run,
     58};
     59
     60void qmp_blockdev_create(const char *job_id, BlockdevCreateOptions *options,
     61                         Error **errp)
     62{
     63    BlockdevCreateJob *s;
     64    const char *fmt = BlockdevDriver_str(options->driver);
     65    BlockDriver *drv = bdrv_find_format(fmt);
     66
     67    if (!drv) {
     68        error_setg(errp, "Block driver '%s' not found or not supported", fmt);
     69        return;
     70    }
     71
     72    /* If the driver is in the schema, we know that it exists. But it may not
     73     * be whitelisted. */
     74    if (bdrv_uses_whitelist() && !bdrv_is_whitelisted(drv, false)) {
     75        error_setg(errp, "Driver is not whitelisted");
     76        return;
     77    }
     78
     79    /* Error out if the driver doesn't support .bdrv_co_create */
     80    if (!drv->bdrv_co_create) {
     81        error_setg(errp, "Driver does not support blockdev-create");
     82        return;
     83    }
     84
     85    /* Create the block job */
     86    /* TODO Running in the main context. Block drivers need to error out or add
     87     * locking when they use a BDS in a different AioContext. */
     88    s = job_create(job_id, &blockdev_create_job_driver, NULL,
     89                   qemu_get_aio_context(), JOB_DEFAULT | JOB_MANUAL_DISMISS,
     90                   NULL, NULL, errp);
     91    if (!s) {
     92        return;
     93    }
     94
     95    s->drv = drv,
     96    s->opts = QAPI_CLONE(BlockdevCreateOptions, options),
     97
     98    job_start(&s->common);
     99}