[libvirt] [PATCHv4 2/4] add pci passthrough to libxl driver
Jim Fehlig
jfehlig at suse.com
Wed Aug 21 22:10:24 UTC 2013
cyliu at suse.com wrote:
> From: Chunyan Liu <cyliu at suse.com>
>
> Add pci passthrough to libxl driver, support attach-device, detach-device and
> start a vm with pci hostdev specified.
>
While testing this patch, I noticed it only works with "managed"
hostdevs, i.e. hostdevs with managed='yes' attribute. Should this patch
include an implementation of the nodeDevice* functions so users can e.g.
do 'virsh nodedev-detach' prior to attaching or starting a domain with
an "unmanaged" hostdev? Alternatively, the nodeDevice* functions could
be implemented in a patch that precedes this one.
Regards,
Jim
> Signed-off-by: Chunyan Liu <cyliu at suse.com>
> ---
> po/POTFILES.in | 2 +-
> src/libxl/libxl_conf.c | 63 +++++++++++
> src/libxl/libxl_conf.h | 4 +
> src/libxl/libxl_driver.c | 262 +++++++++++++++++++++++++++++++++++++++++++++-
> 4 files changed, 329 insertions(+), 2 deletions(-)
>
> diff --git a/po/POTFILES.in b/po/POTFILES.in
> index 6799d47..50030f8 100644
> --- a/po/POTFILES.in
> +++ b/po/POTFILES.in
> @@ -157,6 +157,7 @@ src/util/vireventpoll.c
> src/util/virfile.c
> src/util/virhash.c
> src/util/virhook.c
> +src/util/virhostdev.c
> src/util/viridentity.c
> src/util/virinitctl.c
> src/util/viriptables.c
> @@ -194,7 +195,6 @@ src/util/viruri.c
> src/util/virusb.c
> src/util/virutil.c
> src/util/virxml.c
> -src/util/virhostdev.c
> src/vbox/vbox_MSCOMGlue.c
> src/vbox/vbox_XPCOMCGlue.c
> src/vbox/vbox_driver.c
> diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
> index 73e2d49..f76f432 100644
> --- a/src/libxl/libxl_conf.c
> +++ b/src/libxl/libxl_conf.c
> @@ -869,6 +869,66 @@ error:
> return -1;
> }
>
> +int
> +libxlMakePci(virDomainHostdevDefPtr hostdev, libxl_device_pci *pcidev)
> +{
> + if (hostdev->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS)
> + return -1;
> + if (hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI)
> + return -1;
> +
> + pcidev->domain = hostdev->source.subsys.u.pci.addr.domain;
> + pcidev->bus = hostdev->source.subsys.u.pci.addr.bus;
> + pcidev->dev = hostdev->source.subsys.u.pci.addr.slot;
> + pcidev->func = hostdev->source.subsys.u.pci.addr.function;
> +
> + return 0;
> +}
> +
> +static int
> +libxlMakePciList(virDomainDefPtr def, libxl_domain_config *d_config)
> +{
> + virDomainHostdevDefPtr *l_hostdevs = def->hostdevs;
> + size_t nhostdevs = def->nhostdevs;
> + size_t npcidevs = 0;
> + libxl_device_pci *x_pcidevs;
> + size_t i, j;
> +
> + if (nhostdevs == 0)
> + return 0;
> +
> + if (VIR_ALLOC_N(x_pcidevs, nhostdevs) < 0)
> + return -1;
> +
> + for (i = 0, j = 0; i < nhostdevs; i++) {
> + if (l_hostdevs[i]->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS)
> + continue;
> + if (l_hostdevs[i]->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI)
> + continue;
> +
> + libxl_device_pci_init(&x_pcidevs[j]);
> +
> + if (libxlMakePci(l_hostdevs[i], &x_pcidevs[j]) < 0)
> + goto error;
> +
> + npcidevs++;
> + j++;
> + }
> +
> + VIR_SHRINK_N(x_pcidevs, nhostdevs, nhostdevs - npcidevs);
> + d_config->pcidevs = x_pcidevs;
> + d_config->num_pcidevs = npcidevs;
> +
> + return 0;
> +
> +error:
> + for (i = 0; i < npcidevs; i++)
> + libxl_device_pci_dispose(&x_pcidevs[i]);
> +
> + VIR_FREE(x_pcidevs);
> + return -1;
> +}
> +
> virCapsPtr
> libxlMakeCapabilities(libxl_ctx *ctx)
> {
> @@ -913,6 +973,9 @@ libxlBuildDomainConfig(libxlDriverPrivatePtr driver,
> if (libxlMakeVfbList(driver, def, d_config) < 0)
> return -1;
>
> + if (libxlMakePciList(def, d_config) < 0)
> + return -1;
> +
> d_config->on_reboot = def->onReboot;
> d_config->on_poweroff = def->onPoweroff;
> d_config->on_crash = def->onCrash;
> diff --git a/src/libxl/libxl_conf.h b/src/libxl/libxl_conf.h
> index 9d72b72..39d09fe 100644
> --- a/src/libxl/libxl_conf.h
> +++ b/src/libxl/libxl_conf.h
> @@ -37,6 +37,7 @@
> # include "virchrdev.h"
>
>
> +# define LIBXL_DRIVER_NAME "xenlight"
> # define LIBXL_VNC_PORT_MIN 5900
> # define LIBXL_VNC_PORT_MAX 65535
>
> @@ -132,6 +133,9 @@ libxlMakeVfb(libxlDriverPrivatePtr driver,
> virDomainGraphicsDefPtr l_vfb, libxl_device_vfb *x_vfb);
>
> int
> +libxlMakePci(virDomainHostdevDefPtr hostdev, libxl_device_pci *pcidev);
> +
> +int
> libxlBuildDomainConfig(libxlDriverPrivatePtr driver,
> virDomainObjPtr vm, libxl_domain_config *d_config);
>
> diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
> index f09ad61..029fa0c 100644
> --- a/src/libxl/libxl_driver.c
> +++ b/src/libxl/libxl_driver.c
> @@ -49,6 +49,7 @@
> #include "virstring.h"
> #include "virsysinfo.h"
> #include "viraccessapicheck.h"
> +#include "virhostdev.h"
>
> #define VIR_FROM_THIS VIR_FROM_LIBXL
>
> @@ -742,6 +743,7 @@ libxlVmReap(libxlDriverPrivatePtr driver,
> virDomainShutoffReason reason)
> {
> libxlDomainObjPrivatePtr priv = vm->privateData;
> + virHostdevManagerPtr hostdev_mgr;
>
> if (libxl_domain_destroy(priv->ctx, vm->def->id, NULL) < 0) {
> virReportError(VIR_ERR_INTERNAL_ERROR,
> @@ -749,6 +751,10 @@ libxlVmReap(libxlDriverPrivatePtr driver,
> return -1;
> }
>
> + hostdev_mgr = virHostdevManagerGetDefault();
> + virHostdevReAttachDomainHostdevs(hostdev_mgr, LIBXL_DRIVER_NAME,
> + vm->def, VIR_SP_PCI_HOSTDEV);
> +
> libxlVmCleanup(driver, vm, reason);
> return 0;
> }
> @@ -972,6 +978,7 @@ libxlVmStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
> char *managed_save_path = NULL;
> int managed_save_fd = -1;
> libxlDomainObjPrivatePtr priv = vm->privateData;
> + virHostdevManagerPtr hostdev_mgr;
>
> if (libxlDomainObjPrivateInitCtx(vm) < 0)
> goto error;
> @@ -1029,6 +1036,12 @@ libxlVmStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
> goto error;
> }
>
> + VIR_DEBUG("Preparing host PCI devices");
> + hostdev_mgr = virHostdevManagerGetDefault();
> + if (virHostdevPrepareDomainHostdevs(hostdev_mgr, LIBXL_DRIVER_NAME,
> + vm->def, VIR_SP_PCI_HOSTDEV) < 0)
> + goto error;
> +
> /* use as synchronous operations => ao_how = NULL and no intermediate reports => ao_progress = NULL */
>
> if (restore_fd < 0)
> @@ -1122,6 +1135,7 @@ libxlReconnectDomain(virDomainObjPtr vm,
> libxl_dominfo d_info;
> int len;
> uint8_t *data = NULL;
> + virHostdevManagerPtr hostdev_mgr;
>
> virObjectLock(vm);
>
> @@ -1144,6 +1158,13 @@ libxlReconnectDomain(virDomainObjPtr vm,
>
> /* Update domid in case it changed (e.g. reboot) while we were gone? */
> vm->def->id = d_info.domid;
> +
> + /* Update hostdev state */
> + hostdev_mgr = virHostdevManagerGetDefault();
> + if (virHostdevPrepareDomainHostdevs(hostdev_mgr, LIBXL_DRIVER_NAME,
> + vm->def, VIR_SP_PCI_HOSTDEV) < 0)
> + goto out;
> +
> virDomainObjSetState(vm, VIR_DOMAIN_RUNNING, VIR_DOMAIN_RUNNING_UNKNOWN);
>
> if (!driver->nactive && driver->inhibitCallback)
> @@ -3569,6 +3590,95 @@ cleanup:
> }
>
> static int
> +libxlDomainAttachHostPciDevice(libxlDomainObjPrivatePtr priv,
> + virDomainObjPtr vm,
> + virDomainHostdevDefPtr hostdev)
> +{
> + libxl_device_pci pcidev;
> + virDomainHostdevDefPtr found;
> + virHostdevManagerPtr hostdev_mgr;
> +
> + if (hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI)
> + return -1;
> +
> + if (virDomainHostdevFind(vm->def, hostdev, &found) >= 0) {
> + virReportError(VIR_ERR_OPERATION_FAILED,
> + _("target pci device %.4x:%.2x:%.2x.%.1x already exists"),
> + hostdev->source.subsys.u.pci.addr.domain,
> + hostdev->source.subsys.u.pci.addr.bus,
> + hostdev->source.subsys.u.pci.addr.slot,
> + hostdev->source.subsys.u.pci.addr.function);
> + return -1;
> + }
> +
> + if (VIR_REALLOC_N(vm->def->hostdevs, vm->def->nhostdevs + 1) < 0)
> + return -1;
> +
> + hostdev_mgr = virHostdevManagerGetDefault();
> + if (virHostdevPreparePciHostdevs(hostdev_mgr, LIBXL_DRIVER_NAME,
> + vm->def->name, vm->def->uuid,
> + &hostdev, 1, 0) < 0) {
> + goto cleanup;
> + }
> +
> + if (libxlMakePci(hostdev, &pcidev) < 0)
> + goto reattach_hostdev;
> +
> + if (libxl_device_pci_add(priv->ctx, vm->def->id, &pcidev, 0) < 0) {
> + virReportError(VIR_ERR_INTERNAL_ERROR,
> + _("libxenlight failed to attach pci device %.4x:%.2x:%.2x.%.1x"),
> + hostdev->source.subsys.u.pci.addr.domain,
> + hostdev->source.subsys.u.pci.addr.bus,
> + hostdev->source.subsys.u.pci.addr.slot,
> + hostdev->source.subsys.u.pci.addr.function);
> + goto reattach_hostdev;
> + }
> +
> + vm->def->hostdevs[vm->def->nhostdevs++] = hostdev;
> + return 0;
> +
> +reattach_hostdev:
> + virHostdevReAttachPciHostdevs(hostdev_mgr, LIBXL_DRIVER_NAME,
> + vm->def->name, &hostdev, 1);
> +
> +cleanup:
> + return -1;
> +}
> +
> +static int
> +libxlDomainAttachHostDevice(libxlDomainObjPrivatePtr priv,
> + virDomainObjPtr vm,
> + virDomainDeviceDefPtr dev)
> +{
> + virDomainHostdevDefPtr hostdev = dev->data.hostdev;
> +
> + if (hostdev->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS) {
> + virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
> + _("hostdev mode '%s' not supported"),
> + virDomainHostdevModeTypeToString(hostdev->mode));
> + return -1;
> + }
> +
> + switch (hostdev->source.subsys.type) {
> + case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI:
> + if (libxlDomainAttachHostPciDevice(priv, vm, hostdev) < 0)
> + goto error;
> + break;
> +
> + default:
> + virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
> + _("hostdev subsys type '%s' not supported"),
> + virDomainHostdevSubsysTypeToString(hostdev->source.subsys.type));
> + goto error;
> + }
> +
> + return 0;
> +
> +error:
> + return -1;
> +}
> +
> +static int
> libxlDomainDetachDeviceDiskLive(libxlDomainObjPrivatePtr priv,
> virDomainObjPtr vm, virDomainDeviceDefPtr dev)
> {
> @@ -3635,6 +3745,12 @@ libxlDomainAttachDeviceLive(libxlDomainObjPrivatePtr priv, virDomainObjPtr vm,
> dev->data.disk = NULL;
> break;
>
> + case VIR_DOMAIN_DEVICE_HOSTDEV:
> + ret = libxlDomainAttachHostDevice(priv, vm, dev);
> + if (!ret)
> + dev->data.hostdev = NULL;
> + break;
> +
> default:
> virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
> _("device type '%s' cannot be attached"),
> @@ -3649,6 +3765,8 @@ static int
> libxlDomainAttachDeviceConfig(virDomainDefPtr vmdef, virDomainDeviceDefPtr dev)
> {
> virDomainDiskDefPtr disk;
> + virDomainHostdevDefPtr hostdev;
> + virDomainHostdevDefPtr found;
>
> switch (dev->type) {
> case VIR_DOMAIN_DEVICE_DISK:
> @@ -3663,6 +3781,25 @@ libxlDomainAttachDeviceConfig(virDomainDefPtr vmdef, virDomainDeviceDefPtr dev)
> /* vmdef has the pointer. Generic codes for vmdef will do all jobs */
> dev->data.disk = NULL;
> break;
> + case VIR_DOMAIN_DEVICE_HOSTDEV:
> + hostdev = dev->data.hostdev;
> +
> + if (hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI)
> + return -1;
> +
> + if (virDomainHostdevFind(vmdef, hostdev, &found) >= 0) {
> + virReportError(VIR_ERR_OPERATION_FAILED,
> + _("target pci device %.4x:%.2x:%.2x.%.1x\
> + already exists"),
> + hostdev->source.subsys.u.pci.addr.domain,
> + hostdev->source.subsys.u.pci.addr.bus,
> + hostdev->source.subsys.u.pci.addr.slot,
> + hostdev->source.subsys.u.pci.addr.function);
> + return -1;
> + }
> +
> + virDomainHostdevInsert(vmdef, hostdev);
> + break;
>
> default:
> virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
> @@ -3673,6 +3810,124 @@ libxlDomainAttachDeviceConfig(virDomainDefPtr vmdef, virDomainDeviceDefPtr dev)
> }
>
> static int
> +libxlComparePCIDevice(virDomainDefPtr def ATTRIBUTE_UNUSED,
> + virDomainDeviceDefPtr device ATTRIBUTE_UNUSED,
> + virDomainDeviceInfoPtr info1,
> + void *opaque)
> +{
> + virDomainDeviceInfoPtr info2 = opaque;
> +
> + if (info1->type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI ||
> + info2->type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI)
> + return 0;
> +
> + if (info1->addr.pci.domain == info2->addr.pci.domain &&
> + info1->addr.pci.bus == info2->addr.pci.bus &&
> + info1->addr.pci.slot == info2->addr.pci.slot &&
> + info1->addr.pci.function != info2->addr.pci.function)
> + return -1;
> + return 0;
> +}
> +
> +static bool
> +libxlIsMultiFunctionDevice(virDomainDefPtr def,
> + virDomainDeviceInfoPtr dev)
> +{
> + if (virDomainDeviceInfoIterate(def, libxlComparePCIDevice, dev) < 0)
> + return true;
> + return false;
> +}
> +
> +static int
> +libxlDomainDetachHostPciDevice(libxlDomainObjPrivatePtr priv,
> + virDomainObjPtr vm,
> + virDomainHostdevDefPtr hostdev)
> +{
> + virDomainHostdevSubsysPtr subsys = &hostdev->source.subsys;
> + libxl_device_pci pcidev;
> + virDomainHostdevDefPtr detach;
> + int idx;
> + virHostdevManagerPtr hostdev_mgr;
> +
> + if (subsys->type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI)
> + return -1;
> +
> + idx = virDomainHostdevFind(vm->def, hostdev, &detach);
> + if (idx < 0) {
> + virReportError(VIR_ERR_OPERATION_FAILED,
> + _("host pci device %.4x:%.2x:%.2x.%.1x not found"),
> + subsys->u.pci.addr.domain, subsys->u.pci.addr.bus,
> + subsys->u.pci.addr.slot, subsys->u.pci.addr.function);
> + return -1;
> + }
> +
> + if (libxlIsMultiFunctionDevice(vm->def, detach->info)) {
> + virReportError(VIR_ERR_OPERATION_FAILED,
> + _("cannot hot unplug multifunction PCI device: %.4x:%.2x:%.2x.%.1x"),
> + subsys->u.pci.addr.domain, subsys->u.pci.addr.bus,
> + subsys->u.pci.addr.slot, subsys->u.pci.addr.function);
> + goto cleanup;
> + }
> +
> +
> + libxl_device_pci_init(&pcidev);
> +
> + if (libxlMakePci(detach, &pcidev) < 0)
> + goto cleanup;
> +
> + if (libxl_device_pci_remove(priv->ctx, vm->def->id, &pcidev, 0) < 0) {
> + virReportError(VIR_ERR_INTERNAL_ERROR,
> + _("libxenlight failed to detach pci device\
> + %.4x:%.2x:%.2x.%.1x"),
> + subsys->u.pci.addr.domain, subsys->u.pci.addr.bus,
> + subsys->u.pci.addr.slot, subsys->u.pci.addr.function);
> + goto cleanup;
> + }
> +
> + libxl_device_pci_dispose(&pcidev);
> +
> + virDomainHostdevRemove(vm->def, idx);
> +
> + hostdev_mgr = virHostdevManagerGetDefault();
> + virHostdevReAttachPciHostdevs(hostdev_mgr, LIBXL_DRIVER_NAME,
> + vm->def->name, &hostdev, 1);
> +
> + return 0;
> +
> +cleanup:
> + virDomainHostdevDefFree(detach);
> + return -1;
> +}
> +
> +static int
> +libxlDomainDetachHostDevice(libxlDomainObjPrivatePtr priv,
> + virDomainObjPtr vm,
> + virDomainDeviceDefPtr dev)
> +{
> + virDomainHostdevDefPtr hostdev = dev->data.hostdev;
> + virDomainHostdevSubsysPtr subsys = &hostdev->source.subsys;
> +
> + if (hostdev->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS) {
> + virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
> + _("hostdev mode '%s' not supported"),
> + virDomainHostdevModeTypeToString(hostdev->mode));
> + return -1;
> + }
> +
> + switch (subsys->type) {
> + case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI:
> + return libxlDomainDetachHostPciDevice(priv, vm, hostdev);
> +
> + default:
> + virReportError(VIR_ERR_INTERNAL_ERROR,
> + _("unexpected hostdev type %d"), subsys->type);
> + break;
> + }
> +
> + return -1;
> +}
> +
> +static int
> libxlDomainDetachDeviceLive(libxlDomainObjPrivatePtr priv, virDomainObjPtr vm,
> virDomainDeviceDefPtr dev)
> {
> @@ -3683,6 +3938,10 @@ libxlDomainDetachDeviceLive(libxlDomainObjPrivatePtr priv, virDomainObjPtr vm,
> ret = libxlDomainDetachDeviceDiskLive(priv, vm, dev);
> break;
>
> + case VIR_DOMAIN_DEVICE_HOSTDEV:
> + ret = libxlDomainDetachHostDevice(priv, vm, dev);
> + break;
> +
> default:
> virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
> _("device type '%s' cannot be detached"),
> @@ -3693,6 +3952,7 @@ libxlDomainDetachDeviceLive(libxlDomainObjPrivatePtr priv, virDomainObjPtr vm,
> return ret;
> }
>
> +
> static int
> libxlDomainDetachDeviceConfig(virDomainDefPtr vmdef, virDomainDeviceDefPtr dev)
> {
> @@ -4951,7 +5211,7 @@ libxlConnectSupportsFeature(virConnectPtr conn, int feature)
>
> static virDriver libxlDriver = {
> .no = VIR_DRV_LIBXL,
> - .name = "xenlight",
> + .name = LIBXL_DRIVER_NAME,
> .connectOpen = libxlConnectOpen, /* 0.9.0 */
> .connectClose = libxlConnectClose, /* 0.9.0 */
> .connectGetType = libxlConnectGetType, /* 0.9.0 */
>
More information about the libvir-list
mailing list