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Add support for misc host device passthrough with LXC 

This extends support for host device passthrough with LXC to
cover misc devices. In this case all we need todo is a
mknod in the container's /dev and whitelist the device in
cgroups

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2012-11-28 18:07:47 +00:00
parent 313669d1c1
commit 83a9c93807
2 changed files with 68 additions and 0 deletions
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7
src/lxc/lxc_cgroup.c
View File

@ -439,6 +439,13 @@ static int virLXCCgroupSetupDeviceACL(virDomainDefPtr def,
VIR_CGROUP_DEVICE_MKNOD) < 0)
goto cleanup;
break;
case VIR_DOMAIN_HOSTDEV_CAPS_TYPE_MISC:
if (virCgroupAllowDevicePath(cgroup,
hostdev->source.caps.u.misc.chardev,
VIR_CGROUP_DEVICE_RW |
VIR_CGROUP_DEVICE_MKNOD) < 0)
goto cleanup;
break;
default:
break;
}

61
src/lxc/lxc_container.c
View File

@ -1443,6 +1443,64 @@ cleanup:
}
static int lxcContainerSetupHostdevCapsMisc(virDomainDefPtr vmDef ATTRIBUTE_UNUSED,
virDomainHostdevDefPtr def ATTRIBUTE_UNUSED,
const char *dstprefix ATTRIBUTE_UNUSED,
virSecurityManagerPtr securityDriver ATTRIBUTE_UNUSED)
{
char *src = NULL;
int ret = -1;
struct stat sb;
mode_t mode;
if (def->source.caps.u.misc.chardev == NULL) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Missing storage host block path"));
goto cleanup;
}
if (virAsprintf(&src, "%s/%s", dstprefix, def->source.caps.u.misc.chardev) < 0) {
virReportOOMError();
goto cleanup;
}
if (stat(src, &sb) < 0) {
virReportSystemError(errno,
_("Unable to access %s"),
src);
goto cleanup;
}
if (!S_ISCHR(sb.st_mode)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("Storage source %s must be a character device"),
def->source.caps.u.misc.chardev);
goto cleanup;
}
mode = 0700 | S_IFCHR;
VIR_DEBUG("Creating dev %s (%d,%d)",
def->source.caps.u.misc.chardev,
major(sb.st_rdev), minor(sb.st_rdev));
if (mknod(def->source.caps.u.misc.chardev, mode, sb.st_rdev) < 0) {
virReportSystemError(errno,
_("Unable to create device %s"),
def->source.caps.u.misc.chardev);
goto cleanup;
}
if (virSecurityManagerSetHostdevLabel(securityDriver, vmDef, def, NULL) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(src);
return ret;
}
static int lxcContainerSetupHostdevSubsys(virDomainDefPtr vmDef,
virDomainHostdevDefPtr def,
const char *dstprefix,
@ -1470,6 +1528,9 @@ static int lxcContainerSetupHostdevCaps(virDomainDefPtr vmDef,
case VIR_DOMAIN_HOSTDEV_CAPS_TYPE_STORAGE:
return lxcContainerSetupHostdevCapsStorage(vmDef, def, dstprefix, securityDriver);
case VIR_DOMAIN_HOSTDEV_CAPS_TYPE_MISC:
return lxcContainerSetupHostdevCapsMisc(vmDef, def, dstprefix, securityDriver);
default:
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("Unsupported host device mode %s"),