libvirt/src/qemu/qemu_hostdev.c
Michal Privoznik f988128cc1 qemu_hostdev: Introduce qemuHostdevNeedsVFIO()
There are two types of host devices that require /dev/vfio/vfio
access:

  1) PCI devices with VFIO backend
  2) Mediated devices

Introduce a simple helper that returns true if passed @hostdev
falls in either of the categories.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Cole Robinson <crobinso@redhat.com>
2019-10-21 13:50:24 +02:00

440 lines
14 KiB
C

/*
* qemu_hostdev.c: QEMU hostdev management
*
* Copyright (C) 2006-2007, 2009-2014 Red Hat, Inc.
* Copyright (C) 2006 Daniel P. Berrange
*
* 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/>.
*/
#include <config.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include "qemu_hostdev.h"
#include "qemu_domain.h"
#include "virlog.h"
#include "virerror.h"
#include "viralloc.h"
#include "virpci.h"
#include "virusb.h"
#include "virscsi.h"
#include "virnetdev.h"
#include "virfile.h"
#include "virhostdev.h"
#define VIR_FROM_THIS VIR_FROM_QEMU
VIR_LOG_INIT("qemu.qemu_hostdev");
int
qemuHostdevUpdateActivePCIDevices(virQEMUDriverPtr driver,
virDomainDefPtr def)
{
virHostdevManagerPtr mgr = driver->hostdevMgr;
if (!def->nhostdevs)
return 0;
return virHostdevUpdateActivePCIDevices(mgr, def->hostdevs, def->nhostdevs,
QEMU_DRIVER_NAME, def->name);
}
int
qemuHostdevUpdateActiveUSBDevices(virQEMUDriverPtr driver,
virDomainDefPtr def)
{
virHostdevManagerPtr mgr = driver->hostdevMgr;
if (!def->nhostdevs)
return 0;
return virHostdevUpdateActiveUSBDevices(mgr, def->hostdevs, def->nhostdevs,
QEMU_DRIVER_NAME, def->name);
}
int
qemuHostdevUpdateActiveSCSIDevices(virQEMUDriverPtr driver,
virDomainDefPtr def)
{
virHostdevManagerPtr mgr = driver->hostdevMgr;
if (!def->nhostdevs)
return 0;
return virHostdevUpdateActiveSCSIDevices(mgr, def->hostdevs, def->nhostdevs,
QEMU_DRIVER_NAME, def->name);
}
int
qemuHostdevUpdateActiveMediatedDevices(virQEMUDriverPtr driver,
virDomainDefPtr def)
{
virHostdevManagerPtr mgr = driver->hostdevMgr;
if (!def->nhostdevs)
return 0;
return virHostdevUpdateActiveMediatedDevices(mgr, def->hostdevs,
def->nhostdevs,
QEMU_DRIVER_NAME, def->name);
}
int
qemuHostdevUpdateActiveDomainDevices(virQEMUDriverPtr driver,
virDomainDefPtr def)
{
if (!def->nhostdevs)
return 0;
if (qemuHostdevUpdateActivePCIDevices(driver, def) < 0)
return -1;
if (qemuHostdevUpdateActiveUSBDevices(driver, def) < 0)
return -1;
if (qemuHostdevUpdateActiveSCSIDevices(driver, def) < 0)
return -1;
if (qemuHostdevUpdateActiveMediatedDevices(driver, def) < 0)
return -1;
return 0;
}
bool
qemuHostdevNeedsVFIO(const virDomainHostdevDef *hostdev)
{
return virHostdevIsVFIODevice(hostdev) ||
virHostdevIsMdevDevice(hostdev);
}
bool
qemuHostdevHostSupportsPassthroughVFIO(void)
{
/* condition 1 - host has IOMMU */
if (!virHostHasIOMMU())
return false;
/* condition 2 - /dev/vfio/vfio exists */
if (!virFileExists(QEMU_DEV_VFIO))
return false;
return true;
}
static bool
qemuHostdevPreparePCIDevicesCheckSupport(virDomainHostdevDefPtr *hostdevs,
size_t nhostdevs,
virQEMUCapsPtr qemuCaps)
{
bool supportsPassthroughVFIO = qemuHostdevHostSupportsPassthroughVFIO();
size_t i;
/* assign defaults for hostdev passthrough */
for (i = 0; i < nhostdevs; i++) {
virDomainHostdevDefPtr hostdev = hostdevs[i];
int *backend = &hostdev->source.subsys.u.pci.backend;
if (hostdev->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS)
continue;
if (hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI)
continue;
switch ((virDomainHostdevSubsysPCIBackendType)*backend) {
case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_DEFAULT:
if (supportsPassthroughVFIO &&
virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VFIO_PCI)) {
*backend = VIR_DOMAIN_HOSTDEV_PCI_BACKEND_VFIO;
} else {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("host doesn't support passthrough of "
"host PCI devices"));
return false;
}
break;
case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_VFIO:
if (!supportsPassthroughVFIO) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("host doesn't support VFIO PCI passthrough"));
return false;
}
break;
case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_KVM:
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("host doesn't support legacy PCI passthrough"));
return false;
break;
case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_XEN:
case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_TYPE_LAST:
break;
}
}
return true;
}
int
qemuHostdevPreparePCIDevices(virQEMUDriverPtr driver,
const char *name,
const unsigned char *uuid,
virDomainHostdevDefPtr *hostdevs,
int nhostdevs,
virQEMUCapsPtr qemuCaps,
unsigned int flags)
{
int ret = -1;
virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
if (!qemuHostdevPreparePCIDevicesCheckSupport(hostdevs, nhostdevs, qemuCaps))
goto out;
ret = virHostdevPreparePCIDevices(hostdev_mgr, QEMU_DRIVER_NAME,
name, uuid, hostdevs,
nhostdevs, flags);
out:
return ret;
}
int
qemuHostdevPrepareUSBDevices(virQEMUDriverPtr driver,
const char *name,
virDomainHostdevDefPtr *hostdevs,
int nhostdevs,
unsigned int flags)
{
virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
return virHostdevPrepareUSBDevices(hostdev_mgr, QEMU_DRIVER_NAME, name,
hostdevs, nhostdevs, flags);
}
int
qemuHostdevPrepareSCSIDevices(virQEMUDriverPtr driver,
const char *name,
virDomainHostdevDefPtr *hostdevs,
int nhostdevs)
{
size_t i;
virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
/* Loop 1: Add the shared scsi host device to shared device
* table.
*/
for (i = 0; i < nhostdevs; i++) {
virDomainDeviceDef dev;
if (!virHostdevIsSCSIDevice(hostdevs[i]))
continue;
dev.type = VIR_DOMAIN_DEVICE_HOSTDEV;
dev.data.hostdev = hostdevs[i];
if (qemuAddSharedDevice(driver, &dev, name) < 0)
return -1;
if (qemuSetUnprivSGIO(&dev) < 0)
return -1;
}
return virHostdevPrepareSCSIDevices(hostdev_mgr, QEMU_DRIVER_NAME,
name, hostdevs, nhostdevs);
}
int
qemuHostdevPrepareSCSIVHostDevices(virQEMUDriverPtr driver,
const char *name,
virDomainHostdevDefPtr *hostdevs,
int nhostdevs)
{
virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
return virHostdevPrepareSCSIVHostDevices(hostdev_mgr, QEMU_DRIVER_NAME,
name, hostdevs, nhostdevs);
}
int
qemuHostdevPrepareMediatedDevices(virQEMUDriverPtr driver,
const char *name,
virDomainHostdevDefPtr *hostdevs,
int nhostdevs)
{
virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
bool supportsVFIO;
size_t i;
/* Checking for VFIO only is fine with mdev, as IOMMU isolation is achieved
* by the physical parent device.
*/
supportsVFIO = virFileExists(QEMU_DEV_VFIO);
for (i = 0; i < nhostdevs; i++) {
if (virHostdevIsMdevDevice(hostdevs[i])) {
if (!supportsVFIO) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Mediated host device assignment requires "
"VFIO support"));
return -1;
}
break;
}
}
return virHostdevPrepareMediatedDevices(hostdev_mgr, QEMU_DRIVER_NAME,
name, hostdevs, nhostdevs);
}
int
qemuHostdevPrepareDomainDevices(virQEMUDriverPtr driver,
virDomainDefPtr def,
virQEMUCapsPtr qemuCaps,
unsigned int flags)
{
if (!def->nhostdevs)
return 0;
if (qemuHostdevPreparePCIDevices(driver, def->name, def->uuid,
def->hostdevs, def->nhostdevs,
qemuCaps, flags) < 0)
return -1;
if (qemuHostdevPrepareUSBDevices(driver, def->name,
def->hostdevs, def->nhostdevs, flags) < 0)
return -1;
if (qemuHostdevPrepareSCSIDevices(driver, def->name,
def->hostdevs, def->nhostdevs) < 0)
return -1;
if (qemuHostdevPrepareSCSIVHostDevices(driver, def->name,
def->hostdevs, def->nhostdevs) < 0)
return -1;
if (qemuHostdevPrepareMediatedDevices(driver, def->name,
def->hostdevs, def->nhostdevs) < 0)
return -1;
return 0;
}
void
qemuHostdevReAttachPCIDevices(virQEMUDriverPtr driver,
const char *name,
virDomainHostdevDefPtr *hostdevs,
int nhostdevs)
{
virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
const char *oldStateDir = cfg->stateDir;
virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
virHostdevReAttachPCIDevices(hostdev_mgr, QEMU_DRIVER_NAME, name,
hostdevs, nhostdevs, oldStateDir);
virObjectUnref(cfg);
}
void
qemuHostdevReAttachUSBDevices(virQEMUDriverPtr driver,
const char *name,
virDomainHostdevDefPtr *hostdevs,
int nhostdevs)
{
virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
virHostdevReAttachUSBDevices(hostdev_mgr, QEMU_DRIVER_NAME,
name, hostdevs, nhostdevs);
}
void
qemuHostdevReAttachSCSIDevices(virQEMUDriverPtr driver,
const char *name,
virDomainHostdevDefPtr *hostdevs,
int nhostdevs)
{
size_t i;
virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
for (i = 0; i < nhostdevs; i++) {
virDomainHostdevDefPtr hostdev = hostdevs[i];
virDomainDeviceDef dev;
dev.type = VIR_DOMAIN_DEVICE_HOSTDEV;
dev.data.hostdev = hostdev;
ignore_value(qemuRemoveSharedDevice(driver, &dev, name));
}
virHostdevReAttachSCSIDevices(hostdev_mgr, QEMU_DRIVER_NAME,
name, hostdevs, nhostdevs);
}
void
qemuHostdevReAttachSCSIVHostDevices(virQEMUDriverPtr driver,
const char *name,
virDomainHostdevDefPtr *hostdevs,
int nhostdevs)
{
virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
virHostdevReAttachSCSIVHostDevices(hostdev_mgr, QEMU_DRIVER_NAME,
name, hostdevs, nhostdevs);
}
void
qemuHostdevReAttachMediatedDevices(virQEMUDriverPtr driver,
const char *name,
virDomainHostdevDefPtr *hostdevs,
int nhostdevs)
{
virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
virHostdevReAttachMediatedDevices(hostdev_mgr, QEMU_DRIVER_NAME,
name, hostdevs, nhostdevs);
}
void
qemuHostdevReAttachDomainDevices(virQEMUDriverPtr driver,
virDomainDefPtr def)
{
if (!def->nhostdevs)
return;
qemuHostdevReAttachPCIDevices(driver, def->name, def->hostdevs,
def->nhostdevs);
qemuHostdevReAttachUSBDevices(driver, def->name, def->hostdevs,
def->nhostdevs);
qemuHostdevReAttachSCSIDevices(driver, def->name, def->hostdevs,
def->nhostdevs);
qemuHostdevReAttachSCSIVHostDevices(driver, def->name, def->hostdevs,
def->nhostdevs);
qemuHostdevReAttachMediatedDevices(driver, def->name, def->hostdevs,
def->nhostdevs);
}