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libvirt/src/qemu/qemu_hostdev.c
Daniel P. Berrangé 600462834f Remove all Author(s): lines from source file headers 
In many files there are header comments that contain an Author:
statement, supposedly reflecting who originally wrote the code.
In a large collaborative project like libvirt, any non-trivial
file will have been modified by a large number of different
contributors. IOW, the Author: comments are quickly out of date,
omitting people who have made significant contribitions.

In some places Author: lines have been added despite the person
merely being responsible for creating the file by moving existing
code out of another file. IOW, the Author: lines give an incorrect
record of authorship.

With this all in mind, the comments are useless as a means to identify
who to talk to about code in a particular file. Contributors will always
be better off using 'git log' and 'git blame' if they need to  find the
author of a particular bit of code.

This commit thus deletes all Author: comments from the source and adds
a rule to prevent them reappearing.

The Copyright headers are similarly misleading and inaccurate, however,
we cannot delete these as they have legal meaning, despite being largely
inaccurate. In addition only the copyright holder is permitted to change
their respective copyright statement.

Reviewed-by: Erik Skultety <eskultet@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2018-12-13 16:08:38 +00:00

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/*
* 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 "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
qemuHostdevHostSupportsPassthroughVFIO(void)
{
/* condition 1 - host has IOMMU */
if (!virHostHasIOMMU())
return false;
/* condition 2 - /dev/vfio/vfio exists */
if (!virFileExists("/dev/vfio/vfio"))
return false;
return true;
}
#if HAVE_LINUX_KVM_H
# include <linux/kvm.h>
bool
qemuHostdevHostSupportsPassthroughLegacy(void)
{
int kvmfd = -1;
bool ret = false;
if ((kvmfd = open("/dev/kvm", O_RDONLY)) < 0)
goto cleanup;
# ifdef KVM_CAP_IOMMU
if ((ioctl(kvmfd, KVM_CHECK_EXTENSION, KVM_CAP_IOMMU)) <= 0)
goto cleanup;
ret = true;
# endif
cleanup:
VIR_FORCE_CLOSE(kvmfd);
return ret;
}
#else
bool
qemuHostdevHostSupportsPassthroughLegacy(void)
{
return false;
}
#endif
static bool
qemuHostdevPreparePCIDevicesCheckSupport(virDomainHostdevDefPtr *hostdevs,
size_t nhostdevs,
virQEMUCapsPtr qemuCaps)
{
bool supportsPassthroughKVM = qemuHostdevHostSupportsPassthroughLegacy();
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 if (supportsPassthroughKVM) {
*backend = VIR_DOMAIN_HOSTDEV_PCI_BACKEND_KVM;
} 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:
if (!supportsPassthroughKVM) {
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;
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("/dev/vfio/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);
}
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