[libvirt] [PATCH 4/4] qemu: call the helpers in virshm.c to manage shmem device

Daniel P. Berrange berrange at redhat.com
Thu Jul 30 10:23:31 UTC 2015


On Thu, Jul 23, 2015 at 06:13:49PM +0800, Luyao Huang wrote:
> Signed-off-by: Luyao Huang <lhuang at redhat.com>
> ---
>  src/qemu/qemu_conf.h    |   3 +
>  src/qemu/qemu_driver.c  |   4 ++
>  src/qemu/qemu_process.c | 158 ++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 165 insertions(+)
> 
> diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
> index 1c0c734..84b3b5e 100644
> --- a/src/qemu/qemu_process.c
> +++ b/src/qemu/qemu_process.c
> @@ -4321,6 +4321,154 @@ qemuPrepareNVRAM(virQEMUDriverConfigPtr cfg,
>  }
>  
>  
> +static int
> +qemuPrepareShmemDevice(virQEMUDriverPtr driver,
> +                       virDomainObjPtr vm,
> +                       virDomainShmemDefPtr shmem)
> +{
> +    int ret = -1;
> +    virShmObjectPtr tmp;
> +    virShmObjectListPtr list = driver->shmlist;
> +    bool othercreate = false;
> +    char *path = NULL;
> +    bool teardownlabel = false;
> +    bool teardownshm = false;
> +    int type, fd;
> +
> +    virObjectLock(list);
> +
> +    if ((tmp = virShmObjectFindByName(list, shmem->name))) {
> +        if (shmem->size > tmp->size) {
> +            virReportError(VIR_ERR_INTERNAL_ERROR,
> +                           _("Shmem object %s is already exists and "
> +                             "size is smaller than require size"),
> +                           tmp->name);
> +            goto cleanup;
> +        }
> +
> +        if (virShmSetUsedDomain(tmp, QEMU_DRIVER_NAME, vm->def->name) < 0)
> +            goto cleanup;
> +
> +        if (virShmObjectSaveState(tmp, list->stateDir) < 0)
> +            goto cleanup;
> +
> +        virObjectUnlock(list);
> +        return 0;
> +    }
> +
> +    if (!shmem->server.enabled) {
> +        if ((fd = virShmCreate(shmem->name, shmem->size, false, &othercreate, 0600)) < 0)
> +            goto cleanup;
> +        VIR_FORCE_CLOSE(fd);
> +
> +        if ((ret = virShmBuildPath(shmem->name, &path)) == -1) {
> +            ignore_value(virShmUnlink(shmem->name));
> +            goto cleanup;
> +        } else if (ret == -2 && !othercreate) {
> +            ignore_value(virShmUnlink(shmem->name));
> +        }
> +        type = VIR_SHM_TYPE_SHM;
> +    } else {
> +        if (!virFileExists(shmem->server.chr.data.nix.path)) {
> +            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> +                           _("Shmem device server socket is not exist"));
> +            goto cleanup;
> +        } else {
> +            othercreate = true;
> +        }
> +        type = VIR_SHM_TYPE_SERVER;
> +    }
> +    teardownshm = true;
> +
> +    if (virSecurityManagerSetShmemLabel(driver->securityManager,
> +                                        vm->def, shmem, path) < 0)
> +        goto cleanup;

You shouldn't be setting labelling at this point. That should be done
by the later call to virSecurityManagerSetAllLabel

> +static int
> +qemuCleanUpShmemDevice(virQEMUDriverPtr driver,
> +                       virDomainObjPtr vm,
> +                       virDomainShmemDefPtr shmem)
> +{
> +    virShmObjectPtr tmp;
> +    virShmObjectListPtr list = driver->shmlist;
> +    int ret = -1;
> +
> +    virObjectLock(list);
> +
> +    if (!(tmp = virShmObjectFindByName(list, shmem->name))) {
> +        virReportError(VIR_ERR_INTERNAL_ERROR,
> +                       _("Cannot find share memory named '%s'"),
> +                       shmem->name);
> +        goto cleanup;
> +    }
> +    if ((shmem->server.enabled && tmp->type != VIR_SHM_TYPE_SERVER) ||
> +        (!shmem->server.enabled && tmp->type != VIR_SHM_TYPE_SHM)) {
> +        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> +                       _("Shmem object and shmem device type is not equal"));
> +        goto cleanup;
> +    }
> +
> +    if (virShmRemoveUsedDomain(tmp, QEMU_DRIVER_NAME, vm->def->name) < 0)
> +        goto cleanup;
> +
> +    if (tmp->ndomains == 0) {
> +        if (virSecurityManagerRestoreShmemLabel(driver->securityManager,
> +                                                vm->def, shmem, tmp->path) < 0)
> +            VIR_WARN("Unable to restore shared memory device labelling");

Likewise this should be left to the main label restore code

> +
> +        if (!shmem->server.enabled) {
> +            if (!tmp->othercreate &&
> +                virShmUnlink(tmp->name) < 0)
> +                VIR_WARN("Unable to unlink shared memory object");
> +        }
> +
> +        if (virShmObjectRemoveStateFile(list, tmp->name) < 0)
> +            goto cleanup;
> +        virShmObjectListDel(list, tmp);
> +        virShmObjectFree(tmp);
> +    }
> +
> +    ret = 0;
> + cleanup:
> +    virObjectUnlock(list);
> +    return ret;
> +}

Regards,
Daniel
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