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

amend.c (3833B)

      1/*
      2 * Block layer code related to image options amend
      3 *
      4 * Copyright (c) 2018 Kevin Wolf <kwolf@redhat.com>
      5 * Copyright (c) 2020 Red Hat. Inc
      6 *
      7 * Heavily based on create.c
      8 *
      9 * Permission is hereby granted, free of charge, to any person obtaining a copy
     10 * of this software and associated documentation files (the "Software"), to deal
     11 * in the Software without restriction, including without limitation the rights
     12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     13 * copies of the Software, and to permit persons to whom the Software is
     14 * furnished to do so, subject to the following conditions:
     15 *
     16 * The above copyright notice and this permission notice shall be included in
     17 * all copies or substantial portions of the Software.
     18 *
     19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
     22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     25 * THE SOFTWARE.
     26 */
     27
     28#include "qemu/osdep.h"
     29#include "block/block_int.h"
     30#include "qemu/job.h"
     31#include "qemu/main-loop.h"
     32#include "qapi/qapi-commands-block-core.h"
     33#include "qapi/qapi-visit-block-core.h"
     34#include "qapi/clone-visitor.h"
     35#include "qapi/error.h"
     36
     37typedef struct BlockdevAmendJob {
     38    Job common;
     39    BlockdevAmendOptions *opts;
     40    BlockDriverState *bs;
     41    bool force;
     42} BlockdevAmendJob;
     43
     44static int coroutine_fn blockdev_amend_run(Job *job, Error **errp)
     45{
     46    BlockdevAmendJob *s = container_of(job, BlockdevAmendJob, common);
     47    int ret;
     48
     49    job_progress_set_remaining(&s->common, 1);
     50    ret = s->bs->drv->bdrv_co_amend(s->bs, s->opts, s->force, errp);
     51    job_progress_update(&s->common, 1);
     52    qapi_free_BlockdevAmendOptions(s->opts);
     53    return ret;
     54}
     55
     56static const JobDriver blockdev_amend_job_driver = {
     57    .instance_size = sizeof(BlockdevAmendJob),
     58    .job_type      = JOB_TYPE_AMEND,
     59    .run           = blockdev_amend_run,
     60};
     61
     62void qmp_x_blockdev_amend(const char *job_id,
     63                          const char *node_name,
     64                          BlockdevAmendOptions *options,
     65                          bool has_force,
     66                          bool force,
     67                          Error **errp)
     68{
     69    BlockdevAmendJob *s;
     70    const char *fmt = BlockdevDriver_str(options->driver);
     71    BlockDriver *drv = bdrv_find_format(fmt);
     72    BlockDriverState *bs;
     73
     74    bs = bdrv_lookup_bs(NULL, node_name, errp);
     75    if (!bs) {
     76        return;
     77    }
     78
     79    if (!drv) {
     80        error_setg(errp, "Block driver '%s' not found or not supported", fmt);
     81        return;
     82    }
     83
     84    /*
     85     * If the driver is in the schema, we know that it exists. But it may not
     86     * be whitelisted.
     87     */
     88    if (bdrv_uses_whitelist() && !bdrv_is_whitelisted(drv, false)) {
     89        error_setg(errp, "Driver is not whitelisted");
     90        return;
     91    }
     92
     93    if (bs->drv != drv) {
     94        error_setg(errp,
     95                   "x-blockdev-amend doesn't support changing the block driver");
     96        return;
     97    }
     98
     99    /* Error out if the driver doesn't support .bdrv_co_amend */
    100    if (!drv->bdrv_co_amend) {
    101        error_setg(errp, "Driver does not support x-blockdev-amend");
    102        return;
    103    }
    104
    105    /* Create the block job */
    106    s = job_create(job_id, &blockdev_amend_job_driver, NULL,
    107                   bdrv_get_aio_context(bs), JOB_DEFAULT | JOB_MANUAL_DISMISS,
    108                   NULL, NULL, errp);
    109    if (!s) {
    110        return;
    111    }
    112
    113    s->bs = bs,
    114    s->opts = QAPI_CLONE(BlockdevAmendOptions, options),
    115    s->force = has_force ? force : false;
    116    job_start(&s->common);
    117}