Chunyan Liu wrote:
> Add pci passthrough to libxl driver, support attach-device, detach-device and
> start a vm with pci hostdev specified.
>
> Signed-off-by: Chunyan Liu <[email protected]>
> ---
> src/libxl/libxl_conf.c | 63 +++++++
> src/libxl/libxl_conf.h | 7 +-
> src/libxl/libxl_driver.c | 454
> ++++++++++++++++++++++++++++++++++++++++++++++-
> 3 files changed, 518 insertions(+), 6 deletions(-)
>
> diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
> index ade0a08..8ba3ce3 100644
> --- a/src/libxl/libxl_conf.c
> +++ b/src/libxl/libxl_conf.c
> @@ -1147,6 +1147,66 @@ libxlDriverConfigGet(libxlDriverPrivatePtr driver)
> return cfg;
> }
>
> +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;
>
Sorry, I should have mentioned this in my v13 review, but we should
report an error here, similar to libxlMake{Disk,Nic}.
> +
> + 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)
> {
> @@ -1195,6 +1255,9 @@ 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 f089a92..4f6f7ce 100644
> --- a/src/libxl/libxl_conf.h
> +++ b/src/libxl/libxl_conf.h
> @@ -37,8 +37,9 @@
> # include "virportallocator.h"
> # include "virobject.h"
> # include "virchrdev.h"
> +# include "virhostdev.h"
>
> -
> +# define LIBXL_DRIVER_NAME "xenlight"
> # define LIBXL_VNC_PORT_MIN 5900
> # define LIBXL_VNC_PORT_MAX 65535
>
> @@ -90,6 +91,7 @@ struct _libxlDriverConfig {
> struct _libxlDriverPrivate {
> virMutex lock;
>
> + virHostdevManagerPtr hostdevMgr;
> /* Require lock to get reference on 'config',
> * then lockless thereafter */
> libxlDriverConfigPtr config;
> @@ -150,6 +152,9 @@ 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 a79efcb..88a0a90 100644
> --- a/src/libxl/libxl_driver.c
> +++ b/src/libxl/libxl_driver.c
> @@ -52,6 +52,7 @@
> #include "virsysinfo.h"
> #include "viraccessapicheck.h"
> #include "viratomic.h"
> +#include "virhostdev.h"
>
> #define VIR_FROM_THIS VIR_FROM_LIBXL
>
> @@ -309,6 +310,10 @@ libxlVmCleanup(libxlDriverPrivatePtr driver,
> int vnc_port;
> char *file;
> size_t i;
> + virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
> +
> + virHostdevReAttachDomainHostdevs(hostdev_mgr, LIBXL_DRIVER_NAME,
> + vm->def, VIR_HOSTDEV_SP_PCI, NULL);
>
> vm->def->id = -1;
>
> @@ -699,6 +704,7 @@ libxlVmStart(libxlDriverPrivatePtr driver,
> virDomainObjPtr vm,
> #ifdef LIBXL_HAVE_DOMAIN_CREATE_RESTORE_PARAMS
> libxl_domain_restore_params params;
> #endif
> + virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
>
> if (libxlDomainObjPrivateInitCtx(vm) < 0)
> return ret;
> @@ -761,6 +767,10 @@ libxlVmStart(libxlDriverPrivatePtr driver,
> virDomainObjPtr vm,
> goto endjob;
> }
>
> + if (virHostdevPrepareDomainHostdevs(hostdev_mgr, LIBXL_DRIVER_NAME,
> + vm->def, VIR_HOSTDEV_SP_PCI) < 0)
> + goto endjob;
> +
> /* Unlock virDomainObj while creating the domain */
> virObjectUnlock(vm);
> if (restore_fd < 0) {
> @@ -867,6 +877,7 @@ libxlReconnectDomain(virDomainObjPtr vm,
> libxl_dominfo d_info;
> int len;
> uint8_t *data = NULL;
> + virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
>
> virObjectLock(vm);
>
> @@ -890,6 +901,12 @@ 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 */
> + if (virHostdevUpdateDomainActiveHostdevs(hostdev_mgr, LIBXL_DRIVER_NAME,
> + vm->def, VIR_HOSTDEV_SP_PCI) <
> 0)
> + goto out;
> +
> virDomainObjSetState(vm, VIR_DOMAIN_RUNNING, VIR_DOMAIN_RUNNING_UNKNOWN);
>
> if (virAtomicIntInc(&driver->nactive) == 1 && driver->inhibitCallback)
> @@ -922,6 +939,7 @@ libxlStateCleanup(void)
> if (!libxl_driver)
> return -1;
>
> + virObjectUnref(libxl_driver->hostdevMgr);
> virObjectUnref(libxl_driver->config);
> virObjectUnref(libxl_driver->xmlopt);
> virObjectUnref(libxl_driver->domains);
> @@ -1001,6 +1019,9 @@ libxlStateInitialize(bool privileged,
> if (!(libxl_driver->domains = virDomainObjListNew()))
> goto error;
>
> + if (!(libxl_driver->hostdevMgr = virHostdevManagerGetDefault()))
> + goto error;
> +
> if (!(cfg = libxlDriverConfigNew()))
> goto error;
>
> @@ -3274,6 +3295,95 @@ cleanup:
> }
>
> static int
> +libxlDomainAttachHostPciDevice(libxlDriverPrivatePtr driver,
> + libxlDomainObjPrivatePtr priv,
> + virDomainObjPtr vm,
> + virDomainHostdevDefPtr hostdev)
> +{
> + libxl_device_pci pcidev;
> + virDomainHostdevDefPtr found;
> + virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
> +
> + 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;
> +
> + 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, NULL);
> +
> +cleanup:
> + return -1;
>
Looks like you missed my comments from v13
https://www.redhat.com/archives/libvir-list/2014-March/msg00170.html
> +}
> +
> +static int
> +libxlDomainAttachHostDevice(libxlDriverPrivatePtr driver,
> + 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(driver, 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;
>
Ah, same here, and I probably throughout the rest of the patch -
although I didn't check. I guess you missed my message :).
Regards,
Jim
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