[libvirt] [PATCH 01/12] qemu: Drop KVM assignment
Michal Privoznik
mprivozn at redhat.com
Tue Aug 20 14:30:21 UTC 2019
KVM style of PCI devices assignment was dropped in kernel in
favor of vfio pci (see kernel commit v4.12-rc1~68^2~65). Since
vfio is around for quite some time now and is far superior
discourage people in using KVM style.
Ideally, I'd make QEMU_CAPS_VFIO_PCI implicitly assumed but turns
out qemu-3.0.0 doesn't support vfio-pci device for RISC-V.
Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
src/qemu/qemu_capabilities.c | 6 -----
src/qemu/qemu_command.c | 26 ++-------------------
src/qemu/qemu_command.h | 1 -
src/qemu/qemu_driver.c | 14 ++++--------
src/qemu/qemu_hostdev.c | 44 +++---------------------------------
src/qemu/qemu_hostdev.h | 1 -
src/qemu/qemu_hotplug.c | 20 ++--------------
tests/domaincapstest.c | 3 +--
8 files changed, 12 insertions(+), 103 deletions(-)
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index c9677315ab..73300128ea 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -5338,7 +5338,6 @@ static int
virQEMUCapsFillDomainDeviceHostdevCaps(virQEMUCapsPtr qemuCaps,
virDomainCapsDeviceHostdevPtr hostdev)
{
- bool supportsPassthroughKVM = qemuHostdevHostSupportsPassthroughLegacy();
bool supportsPassthroughVFIO = qemuHostdevHostSupportsPassthroughVFIO();
hostdev->supported = VIR_TRISTATE_BOOL_YES;
@@ -5374,11 +5373,6 @@ virQEMUCapsFillDomainDeviceHostdevCaps(virQEMUCapsPtr qemuCaps,
VIR_DOMAIN_HOSTDEV_PCI_BACKEND_VFIO);
}
- if (supportsPassthroughKVM) {
- VIR_DOMAIN_CAPS_ENUM_SET(hostdev->pciBackend,
- VIR_DOMAIN_HOSTDEV_PCI_BACKEND_DEFAULT,
- VIR_DOMAIN_HOSTDEV_PCI_BACKEND_KVM);
- }
return 0;
}
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index e3f4ef624b..f7b5430db8 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -4904,7 +4904,6 @@ char *
qemuBuildPCIHostdevDevStr(const virDomainDef *def,
virDomainHostdevDefPtr dev,
unsigned int bootIndex, /* used iff dev->info->bootIndex == 0 */
- const char *configfd,
virQEMUCapsPtr qemuCaps)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
@@ -4913,16 +4912,11 @@ qemuBuildPCIHostdevDevStr(const virDomainDef *def,
/* caller has to assign proper passthrough backend type */
switch ((virDomainHostdevSubsysPCIBackendType)backend) {
- case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_KVM:
- virBufferAddLit(&buf, "pci-assign");
- if (configfd && *configfd)
- virBufferAsprintf(&buf, ",configfd=%s", configfd);
- break;
-
case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_VFIO:
virBufferAddLit(&buf, "vfio-pci");
break;
+ case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_KVM:
case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_DEFAULT:
case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_XEN:
case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_TYPE_LAST:
@@ -5676,7 +5670,6 @@ qemuBuildHostdevCommandLine(virCommandPtr cmd,
}
}
- char *configfd_name = NULL;
unsigned int bootIndex = hostdev->info->bootIndex;
/* bootNet will be non-0 if boot order was set and no other
@@ -5686,27 +5679,12 @@ qemuBuildHostdevCommandLine(virCommandPtr cmd,
bootIndex = *bootHostdevNet;
*bootHostdevNet = 0;
}
- if (backend != VIR_DOMAIN_HOSTDEV_PCI_BACKEND_VFIO) {
- int configfd = qemuOpenPCIConfig(hostdev);
-
- if (configfd >= 0) {
- if (virAsprintf(&configfd_name, "%d", configfd) < 0) {
- VIR_FORCE_CLOSE(configfd);
- return -1;
- }
-
- virCommandPassFD(cmd, configfd,
- VIR_COMMAND_PASS_FD_CLOSE_PARENT);
- }
- }
if (qemuCommandAddExtDevice(cmd, hostdev->info) < 0)
return -1;
virCommandAddArg(cmd, "-device");
- devstr = qemuBuildPCIHostdevDevStr(def, hostdev, bootIndex,
- configfd_name, qemuCaps);
- VIR_FREE(configfd_name);
+ devstr = qemuBuildPCIHostdevDevStr(def, hostdev, bootIndex, qemuCaps);
if (!devstr)
return -1;
virCommandAddArg(cmd, devstr);
diff --git a/src/qemu/qemu_command.h b/src/qemu/qemu_command.h
index 7e2dc5a60a..e3983bedb2 100644
--- a/src/qemu/qemu_command.h
+++ b/src/qemu/qemu_command.h
@@ -148,7 +148,6 @@ char *qemuBuildMemoryDeviceStr(virDomainMemoryDefPtr mem,
char *qemuBuildPCIHostdevDevStr(const virDomainDef *def,
virDomainHostdevDefPtr dev,
unsigned int bootIndex,
- const char *configfd,
virQEMUCapsPtr qemuCaps);
char *qemuBuildRNGDevStr(const virDomainDef *def,
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 11f97dbc65..eb373c14d7 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -13517,7 +13517,6 @@ qemuNodeDeviceDetachFlags(virNodeDevicePtr dev,
int ret = -1;
virNodeDeviceDefPtr def = NULL;
char *xml = NULL;
- bool legacy = qemuHostdevHostSupportsPassthroughLegacy();
bool vfio = qemuHostdevHostSupportsPassthroughVFIO();
virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
@@ -13544,8 +13543,6 @@ qemuNodeDeviceDetachFlags(virNodeDevicePtr dev,
if (!driverName) {
if (vfio) {
driverName = "vfio";
- } else if (legacy) {
- driverName = "kvm";
} else {
virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
_("neither VFIO nor KVM device assignment is "
@@ -13563,13 +13560,10 @@ qemuNodeDeviceDetachFlags(virNodeDevicePtr dev,
}
virPCIDeviceSetStubDriver(pci, VIR_PCI_STUB_DRIVER_VFIO);
} else if (STREQ(driverName, "kvm")) {
- if (!legacy) {
- virReportError(VIR_ERR_ARGUMENT_UNSUPPORTED, "%s",
- _("KVM device assignment is currently not "
- "supported on this system"));
- goto cleanup;
- }
- virPCIDeviceSetStubDriver(pci, VIR_PCI_STUB_DRIVER_KVM);
+ virReportError(VIR_ERR_ARGUMENT_UNSUPPORTED, "%s",
+ _("KVM device assignment is currently not "
+ "supported on this system"));
+ goto cleanup;
} else {
virReportError(VIR_ERR_INVALID_ARG,
_("unknown driver name '%s'"), driverName);
diff --git a/src/qemu/qemu_hostdev.c b/src/qemu/qemu_hostdev.c
index 92b037e1ed..af41c32679 100644
--- a/src/qemu/qemu_hostdev.c
+++ b/src/qemu/qemu_hostdev.c
@@ -133,44 +133,11 @@ qemuHostdevHostSupportsPassthroughVFIO(void)
}
-#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;
@@ -189,8 +156,6 @@ qemuHostdevPreparePCIDevicesCheckSupport(virDomainHostdevDefPtr *hostdevs,
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 "
@@ -209,12 +174,9 @@ qemuHostdevPreparePCIDevicesCheckSupport(virDomainHostdevDefPtr *hostdevs,
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;
- }
-
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("host doesn't support legacy PCI passthrough"));
+ return false;
break;
case VIR_DOMAIN_HOSTDEV_PCI_BACKEND_XEN:
diff --git a/src/qemu/qemu_hostdev.h b/src/qemu/qemu_hostdev.h
index f6d76c1c2a..e99c204961 100644
--- a/src/qemu/qemu_hostdev.h
+++ b/src/qemu/qemu_hostdev.h
@@ -24,7 +24,6 @@
#include "qemu_conf.h"
#include "domain_conf.h"
-bool qemuHostdevHostSupportsPassthroughLegacy(void);
bool qemuHostdevHostSupportsPassthroughVFIO(void);
int qemuHostdevUpdateActiveMediatedDevices(virQEMUDriverPtr driver,
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index d8be63b71c..63acb9c451 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -1465,8 +1465,6 @@ qemuDomainAttachHostPCIDevice(virQEMUDriverPtr driver,
virDomainDeviceInfoPtr info = hostdev->info;
int ret;
char *devstr = NULL;
- int configfd = -1;
- char *configfd_name = NULL;
bool releaseaddr = false;
bool teardowncgroup = false;
bool teardownlabel = false;
@@ -1547,13 +1545,6 @@ qemuDomainAttachHostPCIDevice(virQEMUDriverPtr driver,
if (qemuDomainEnsurePCIAddress(vm, &dev, driver) < 0)
goto error;
releaseaddr = true;
- if (backend != VIR_DOMAIN_HOSTDEV_PCI_BACKEND_VFIO) {
- configfd = qemuOpenPCIConfig(hostdev);
- if (configfd >= 0) {
- if (virAsprintf(&configfd_name, "fd-%s", info->alias) < 0)
- goto error;
- }
- }
if (!virDomainObjIsActive(vm)) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
@@ -1561,8 +1552,7 @@ qemuDomainAttachHostPCIDevice(virQEMUDriverPtr driver,
goto error;
}
- if (!(devstr = qemuBuildPCIHostdevDevStr(vm->def, hostdev, 0,
- configfd_name, priv->qemuCaps)))
+ if (!(devstr = qemuBuildPCIHostdevDevStr(vm->def, hostdev, 0, priv->qemuCaps)))
goto error;
qemuDomainObjEnterMonitor(driver, vm);
@@ -1570,10 +1560,8 @@ qemuDomainAttachHostPCIDevice(virQEMUDriverPtr driver,
if ((ret = qemuDomainAttachExtensionDevice(priv->mon, hostdev->info)) < 0)
goto exit_monitor;
- if ((ret = qemuMonitorAddDeviceWithFd(priv->mon, devstr,
- configfd, configfd_name)) < 0) {
+ if ((ret = qemuMonitorAddDevice(priv->mon, devstr)) < 0)
ignore_value(qemuDomainDetachExtensionDevice(priv->mon, hostdev->info));
- }
exit_monitor:
if (qemuDomainObjExitMonitor(driver, vm) < 0)
@@ -1586,8 +1574,6 @@ qemuDomainAttachHostPCIDevice(virQEMUDriverPtr driver,
vm->def->hostdevs[vm->def->nhostdevs++] = hostdev;
VIR_FREE(devstr);
- VIR_FREE(configfd_name);
- VIR_FORCE_CLOSE(configfd);
return 0;
@@ -1607,8 +1593,6 @@ qemuDomainAttachHostPCIDevice(virQEMUDriverPtr driver,
qemuHostdevReAttachPCIDevices(driver, vm->def->name, &hostdev, 1);
VIR_FREE(devstr);
- VIR_FREE(configfd_name);
- VIR_FORCE_CLOSE(configfd);
cleanup:
return -1;
diff --git a/tests/domaincapstest.c b/tests/domaincapstest.c
index 45ecfe61ac..77acefa6b0 100644
--- a/tests/domaincapstest.c
+++ b/tests/domaincapstest.c
@@ -111,8 +111,7 @@ fillQemuCaps(virDomainCapsPtr domCaps,
cfg->nfirmwares) < 0)
goto cleanup;
- /* The function above tries to query host's KVM & VFIO capabilities by
- * calling qemuHostdevHostSupportsPassthroughLegacy() and
+ /* The function above tries to query host's VFIO capabilities by calling
* qemuHostdevHostSupportsPassthroughVFIO() which, however, can't be
* successfully mocked as they are not exposed as internal APIs. Therefore,
* instead of mocking set the expected values here by hand. */
--
2.21.0
More information about the libvir-list
mailing list