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https://gitlab.com/libvirt/libvirt.git
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util: Introduce new module virmdev
Beside creation, disposal, getter, and setter methods the module exports methods to work with lists of mediated devices. Signed-off-by: Erik Skultety <eskultet@redhat.com>
This commit is contained in:
parent
57d16d7cf7
commit
e1ec4f88ff
@ -223,6 +223,7 @@ src/util/virlease.c
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src/util/virlockspace.c
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src/util/virlog.c
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src/util/virmacmap.c
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src/util/virmdev.c
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src/util/virnetdev.c
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src/util/virnetdevbandwidth.c
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src/util/virnetdevbridge.c
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@ -190,6 +190,7 @@ UTIL_SOURCES = \
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util/virvhba.c util/virvhba.h \
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util/virxdrdefs.h \
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util/virxml.c util/virxml.h \
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util/virmdev.c util/virmdev.h \
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$(NULL)
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EXTRA_DIST += $(srcdir)/util/keymaps.csv $(srcdir)/util/virkeycode-mapgen.py
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@ -2000,6 +2000,28 @@ virMacMapNew;
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virMacMapRemove;
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virMacMapWriteFile;
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# util/virmdev.h
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virMediatedDeviceFree;
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virMediatedDeviceGetIOMMUGroupDev;
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virMediatedDeviceGetIOMMUGroupNum;
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virMediatedDeviceGetSysfsPath;
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virMediatedDeviceGetUsedBy;
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virMediatedDeviceIsUsed;
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virMediatedDeviceListAdd;
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virMediatedDeviceListCount;
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virMediatedDeviceListDel;
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virMediatedDeviceListFind;
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virMediatedDeviceListGet;
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virMediatedDeviceListMarkDevices;
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virMediatedDeviceListNew;
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virMediatedDeviceListSteal;
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virMediatedDeviceListStealIndex;
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virMediatedDeviceModelTypeFromString;
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virMediatedDeviceModelTypeToString;
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virMediatedDeviceNew;
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virMediatedDeviceSetUsedBy;
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# util/virnetdev.h
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virNetDevAddMulti;
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476
src/util/virmdev.c
Normal file
476
src/util/virmdev.c
Normal file
@ -0,0 +1,476 @@
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/*
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* virmdev.c: helper APIs for managing host mediated devices
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include "dirname.h"
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#include "virmdev.h"
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#include "virlog.h"
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#include "viralloc.h"
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#include "virerror.h"
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#include "virfile.h"
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#include "virstring.h"
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#define VIR_FROM_THIS VIR_FROM_NONE
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VIR_LOG_INIT("util.mdev");
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struct _virMediatedDevice {
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char *path; /* sysfs path */
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virMediatedDeviceModelType model;
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char *used_by_drvname;
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char *used_by_domname;
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};
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struct _virMediatedDeviceList {
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virObjectLockable parent;
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size_t count;
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virMediatedDevicePtr *devs;
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};
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VIR_ENUM_IMPL(virMediatedDeviceModel, VIR_MDEV_MODEL_TYPE_LAST,
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"vfio-pci")
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static virClassPtr virMediatedDeviceListClass;
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static void
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virMediatedDeviceListDispose(void *obj);
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static int
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virMediatedOnceInit(void)
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{
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if (!(virMediatedDeviceListClass = virClassNew(virClassForObjectLockable(),
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"virMediatedDeviceList",
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sizeof(virMediatedDeviceList),
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virMediatedDeviceListDispose)))
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return -1;
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return 0;
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}
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VIR_ONCE_GLOBAL_INIT(virMediated)
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#ifdef __linux__
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# define MDEV_SYSFS_DEVICES "/sys/bus/mdev/devices/"
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static int
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virMediatedDeviceGetSysfsDeviceAPI(virMediatedDevicePtr dev,
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char **device_api)
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{
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int ret = -1;
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char *buf = NULL;
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char *file = NULL;
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char *tmp = NULL;
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if (virAsprintf(&file, "%s/mdev_type/device_api", dev->path) < 0)
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goto cleanup;
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/* TODO - make this a generic method to access sysfs files for various
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* kinds of devices
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*/
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if (!virFileExists(file)) {
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virReportSystemError(errno, _("failed to read '%s'"), file);
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goto cleanup;
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}
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if (virFileReadAll(file, 1024, &buf) < 0)
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goto cleanup;
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if ((tmp = strchr(buf, '\n')))
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*tmp = '\0';
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*device_api = buf;
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buf = NULL;
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ret = 0;
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cleanup:
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VIR_FREE(file);
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VIR_FREE(buf);
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return ret;
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}
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static int
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virMediatedDeviceCheckModel(virMediatedDevicePtr dev,
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virMediatedDeviceModelType model)
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{
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int ret = -1;
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char *dev_api = NULL;
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int actual_model;
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if (virMediatedDeviceGetSysfsDeviceAPI(dev, &dev_api) < 0)
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return -1;
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/* safeguard in case we've got an older libvirt which doesn't know newer
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* device_api models yet
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*/
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if ((actual_model = virMediatedDeviceModelTypeFromString(dev_api)) < 0) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("device API '%s' not supported yet"),
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dev_api);
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goto cleanup;
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}
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if (actual_model != model) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("invalid device API '%s' for device %s: "
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"device only supports '%s'"),
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virMediatedDeviceModelTypeToString(model),
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dev->path, dev_api);
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goto cleanup;
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}
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ret = 0;
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cleanup:
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VIR_FREE(dev_api);
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return ret;
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}
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virMediatedDevicePtr
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virMediatedDeviceNew(const char *uuidstr, virMediatedDeviceModelType model)
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{
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virMediatedDevicePtr ret = NULL;
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virMediatedDevicePtr dev = NULL;
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if (VIR_ALLOC(dev) < 0)
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return NULL;
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if (!(dev->path = virMediatedDeviceGetSysfsPath(uuidstr)))
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goto cleanup;
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/* Check whether the user-provided model corresponds with the actually
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* supported mediated device's API.
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*/
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if (virMediatedDeviceCheckModel(dev, model))
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goto cleanup;
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dev->model = model;
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VIR_STEAL_PTR(ret, dev);
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cleanup:
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virMediatedDeviceFree(dev);
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return ret;
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}
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#else
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virMediatedDevicePtr
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virMediatedDeviceNew(virPCIDeviceAddressPtr pciaddr ATTRIBUTE_UNUSED,
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const char *uuidstr ATTRIBUTE_UNUSED)
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{
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virRerportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("mediated devices are not supported on non-linux "
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"platforms"));
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return NULL;
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}
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#endif /* __linux__ */
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void
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virMediatedDeviceFree(virMediatedDevicePtr dev)
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{
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if (!dev)
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return;
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VIR_FREE(dev->path);
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VIR_FREE(dev->used_by_drvname);
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VIR_FREE(dev->used_by_domname);
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VIR_FREE(dev);
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}
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const char *
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virMediatedDeviceGetPath(virMediatedDevicePtr dev)
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{
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return dev->path;
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}
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/* Returns an absolute canonicalized path to the device used to control the
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* mediated device's IOMMU group (e.g. "/dev/vfio/15"). Caller is responsible
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* for freeing the result.
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*/
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char *
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virMediatedDeviceGetIOMMUGroupDev(virMediatedDevicePtr dev)
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{
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char *resultpath = NULL;
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char *iommu_path = NULL;
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char *vfio_path = NULL;
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if (virAsprintf(&iommu_path, "%s/iommu_group", dev->path) < 0)
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return NULL;
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if (!virFileExists(iommu_path)) {
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virReportSystemError(errno, _("failed to access '%s'"), iommu_path);
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goto cleanup;
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}
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if (virFileResolveLink(iommu_path, &resultpath) < 0) {
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virReportSystemError(errno, _("failed to resolve '%s'"), iommu_path);
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goto cleanup;
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}
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if (virAsprintf(&vfio_path, "/dev/vfio/%s", last_component(resultpath)) < 0)
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goto cleanup;
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cleanup:
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VIR_FREE(resultpath);
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VIR_FREE(iommu_path);
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return vfio_path;
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}
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int
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virMediatedDeviceGetIOMMUGroupNum(virMediatedDevicePtr dev)
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{
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char *vfio_path = NULL;
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char *group_num_str = NULL;
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unsigned int group_num = -1;
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if (!(vfio_path = virMediatedDeviceGetIOMMUGroupDev(dev)))
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return -1;
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group_num_str = last_component(vfio_path);
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ignore_value(virStrToLong_ui(group_num_str, NULL, 10, &group_num));
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VIR_FREE(vfio_path);
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return group_num;
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}
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void
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virMediatedDeviceGetUsedBy(virMediatedDevicePtr dev,
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const char **drvname, const char **domname)
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{
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*drvname = dev->used_by_drvname;
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*domname = dev->used_by_domname;
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}
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int
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virMediatedDeviceSetUsedBy(virMediatedDevicePtr dev,
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const char *drvname,
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const char *domname)
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{
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VIR_FREE(dev->used_by_drvname);
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VIR_FREE(dev->used_by_domname);
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if (VIR_STRDUP(dev->used_by_drvname, drvname) < 0)
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return -1;
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if (VIR_STRDUP(dev->used_by_domname, domname) < 0)
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return -1;
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return 0;
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}
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virMediatedDeviceListPtr
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virMediatedDeviceListNew(void)
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{
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virMediatedDeviceListPtr list;
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if (virMediatedInitialize() < 0)
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return NULL;
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if (!(list = virObjectLockableNew(virMediatedDeviceListClass)))
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return NULL;
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return list;
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}
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static void
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virMediatedDeviceListDispose(void *obj)
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{
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virMediatedDeviceListPtr list = obj;
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size_t i;
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for (i = 0; i < list->count; i++) {
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virMediatedDeviceFree(list->devs[i]);
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list->devs[i] = NULL;
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}
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list->count = 0;
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VIR_FREE(list->devs);
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}
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int
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virMediatedDeviceListAdd(virMediatedDeviceListPtr list,
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virMediatedDevicePtr dev)
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{
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if (virMediatedDeviceListFind(list, dev)) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("device %s is already in use"), dev->path);
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return -1;
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}
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return VIR_APPEND_ELEMENT(list->devs, list->count, dev);
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}
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virMediatedDevicePtr
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virMediatedDeviceListGet(virMediatedDeviceListPtr list,
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ssize_t idx)
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{
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if (idx < 0 || idx >= list->count)
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return NULL;
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return list->devs[idx];
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}
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size_t
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virMediatedDeviceListCount(virMediatedDeviceListPtr list)
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{
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return list->count;
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}
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virMediatedDevicePtr
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virMediatedDeviceListStealIndex(virMediatedDeviceListPtr list,
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ssize_t idx)
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{
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virMediatedDevicePtr ret;
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if (idx < 0 || idx >= list->count)
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return NULL;
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ret = list->devs[idx];
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VIR_DELETE_ELEMENT(list->devs, idx, list->count);
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return ret;
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}
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virMediatedDevicePtr
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virMediatedDeviceListSteal(virMediatedDeviceListPtr list,
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virMediatedDevicePtr dev)
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{
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int idx = virMediatedDeviceListFindIndex(list, dev);
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return virMediatedDeviceListStealIndex(list, idx);
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}
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void
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virMediatedDeviceListDel(virMediatedDeviceListPtr list,
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virMediatedDevicePtr dev)
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{
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virMediatedDevicePtr ret = virMediatedDeviceListSteal(list, dev);
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virMediatedDeviceFree(ret);
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}
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int
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virMediatedDeviceListFindIndex(virMediatedDeviceListPtr list,
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virMediatedDevicePtr dev)
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{
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size_t i;
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for (i = 0; i < list->count; i++) {
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virMediatedDevicePtr other = list->devs[i];
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if (STREQ(other->path, dev->path))
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return i;
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}
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return -1;
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}
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virMediatedDevicePtr
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virMediatedDeviceListFind(virMediatedDeviceListPtr list,
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virMediatedDevicePtr dev)
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{
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int idx;
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if ((idx = virMediatedDeviceListFindIndex(list, dev)) >= 0)
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return list->devs[idx];
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else
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return NULL;
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}
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bool
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virMediatedDeviceIsUsed(virMediatedDevicePtr dev,
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virMediatedDeviceListPtr list)
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{
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const char *drvname, *domname;
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virMediatedDevicePtr tmp = NULL;
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if ((tmp = virMediatedDeviceListFind(list, dev))) {
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virMediatedDeviceGetUsedBy(tmp, &drvname, &domname);
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virReportError(VIR_ERR_OPERATION_INVALID,
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_("mediated device %s is in use by "
|
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"driver %s, domain %s"),
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tmp->path, drvname, domname);
|
||||
}
|
||||
|
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return !!tmp;
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}
|
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|
||||
|
||||
char *
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virMediatedDeviceGetSysfsPath(const char *uuidstr)
|
||||
{
|
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char *ret = NULL;
|
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|
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ignore_value(virAsprintf(&ret, MDEV_SYSFS_DEVICES "%s", uuidstr));
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return ret;
|
||||
}
|
||||
|
||||
|
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int
|
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virMediatedDeviceListMarkDevices(virMediatedDeviceListPtr dst,
|
||||
virMediatedDeviceListPtr src,
|
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const char *drvname,
|
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const char *domname)
|
||||
{
|
||||
int ret = -1;
|
||||
size_t count = virMediatedDeviceListCount(src);
|
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size_t i, j;
|
||||
|
||||
virObjectLock(dst);
|
||||
for (i = 0; i < count; i++) {
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virMediatedDevicePtr mdev = virMediatedDeviceListGet(src, i);
|
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|
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if (virMediatedDeviceIsUsed(mdev, dst) ||
|
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virMediatedDeviceSetUsedBy(mdev, drvname, domname) < 0)
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goto cleanup;
|
||||
|
||||
/* Copy mdev references to the driver list:
|
||||
* - caller is responsible for NOT freeing devices in @list on success
|
||||
* - we're responsible for performing a rollback on failure
|
||||
*/
|
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if (virMediatedDeviceListAdd(dst, mdev) < 0)
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goto rollback;
|
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|
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VIR_DEBUG("'%s' added to list of active mediated devices used by '%s'",
|
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mdev->path, domname);
|
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}
|
||||
|
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ret = 0;
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||||
cleanup:
|
||||
virObjectUnlock(dst);
|
||||
return ret;
|
||||
|
||||
rollback:
|
||||
for (j = 0; j < i; j++) {
|
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virMediatedDevicePtr tmp = virMediatedDeviceListGet(src, j);
|
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virMediatedDeviceListSteal(dst, tmp);
|
||||
}
|
||||
goto cleanup;
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||||
}
|
123
src/util/virmdev.h
Normal file
123
src/util/virmdev.h
Normal file
@ -0,0 +1,123 @@
|
||||
/*
|
||||
* virmdev.h: helper APIs for managing host mediated devices
|
||||
*
|
||||
* This library is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU Lesser General Public
|
||||
* License as published by the Free Software Foundation; either
|
||||
* version 2.1 of the License, or (at your option) any later version.
|
||||
*
|
||||
* This library is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* Lesser General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU Lesser General Public
|
||||
* License along with this library. If not, see
|
||||
* <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#ifndef __VIR_MDEV_H__
|
||||
# define __VIR_MDEV_H__
|
||||
|
||||
# include "internal.h"
|
||||
# include "virobject.h"
|
||||
# include "virutil.h"
|
||||
# include "virpci.h"
|
||||
|
||||
typedef enum {
|
||||
VIR_MDEV_MODEL_TYPE_VFIO_PCI = 0,
|
||||
|
||||
VIR_MDEV_MODEL_TYPE_LAST
|
||||
} virMediatedDeviceModelType;
|
||||
|
||||
VIR_ENUM_DECL(virMediatedDeviceModel)
|
||||
|
||||
|
||||
typedef struct _virMediatedDevice virMediatedDevice;
|
||||
typedef virMediatedDevice *virMediatedDevicePtr;
|
||||
typedef struct _virMediatedDeviceAddress virMediatedDeviceAddress;
|
||||
typedef virMediatedDeviceAddress *virMediatedDeviceAddressPtr;
|
||||
typedef struct _virMediatedDeviceList virMediatedDeviceList;
|
||||
typedef virMediatedDeviceList *virMediatedDeviceListPtr;
|
||||
|
||||
typedef int (*virMediatedDeviceCallback)(virMediatedDevicePtr dev,
|
||||
const char *path, void *opaque);
|
||||
|
||||
virMediatedDevicePtr
|
||||
virMediatedDeviceNew(const char *uuidstr, virMediatedDeviceModelType model);
|
||||
|
||||
virMediatedDevicePtr
|
||||
virMediatedDeviceCopy(virMediatedDevicePtr dev);
|
||||
|
||||
void
|
||||
virMediatedDeviceFree(virMediatedDevicePtr dev);
|
||||
|
||||
const char *
|
||||
virMediatedDeviceGetPath(virMediatedDevicePtr dev);
|
||||
|
||||
void
|
||||
virMediatedDeviceGetUsedBy(virMediatedDevicePtr dev,
|
||||
const char **drvname, const char **domname);
|
||||
|
||||
int
|
||||
virMediatedDeviceSetUsedBy(virMediatedDevicePtr dev,
|
||||
const char *drvname,
|
||||
const char *domname);
|
||||
|
||||
char *
|
||||
virMediatedDeviceGetIOMMUGroupDev(virMediatedDevicePtr dev);
|
||||
|
||||
int
|
||||
virMediatedDeviceGetIOMMUGroupNum(virMediatedDevicePtr dev);
|
||||
|
||||
char *
|
||||
virMediatedDeviceGetSysfsPath(const char *uuidstr);
|
||||
|
||||
bool
|
||||
virMediatedDeviceIsUsed(virMediatedDevicePtr dev,
|
||||
virMediatedDeviceListPtr list);
|
||||
|
||||
bool
|
||||
virMediatedDeviceIsUsed(virMediatedDevicePtr dev,
|
||||
virMediatedDeviceListPtr list);
|
||||
|
||||
virMediatedDeviceListPtr
|
||||
virMediatedDeviceListNew(void);
|
||||
|
||||
int
|
||||
virMediatedDeviceListAdd(virMediatedDeviceListPtr list,
|
||||
virMediatedDevicePtr dev);
|
||||
|
||||
virMediatedDevicePtr
|
||||
virMediatedDeviceListGet(virMediatedDeviceListPtr list,
|
||||
ssize_t idx);
|
||||
|
||||
size_t
|
||||
virMediatedDeviceListCount(virMediatedDeviceListPtr list);
|
||||
|
||||
virMediatedDevicePtr
|
||||
virMediatedDeviceListSteal(virMediatedDeviceListPtr list,
|
||||
virMediatedDevicePtr dev);
|
||||
|
||||
virMediatedDevicePtr
|
||||
virMediatedDeviceListStealIndex(virMediatedDeviceListPtr list,
|
||||
ssize_t idx);
|
||||
|
||||
void
|
||||
virMediatedDeviceListDel(virMediatedDeviceListPtr list,
|
||||
virMediatedDevicePtr dev);
|
||||
|
||||
virMediatedDevicePtr
|
||||
virMediatedDeviceListFind(virMediatedDeviceListPtr list,
|
||||
virMediatedDevicePtr dev);
|
||||
|
||||
int
|
||||
virMediatedDeviceListFindIndex(virMediatedDeviceListPtr list,
|
||||
virMediatedDevicePtr dev);
|
||||
|
||||
int
|
||||
virMediatedDeviceListMarkDevices(virMediatedDeviceListPtr dst,
|
||||
virMediatedDeviceListPtr src,
|
||||
const char *drvname,
|
||||
const char *domname);
|
||||
#endif /* __VIR_MDEV_H__ */
|
Loading…
Reference in New Issue
Block a user