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Add support for <hostdev mode="capabilities"> 

The <hostdev> device type has long had a redundant "mode"
attribute, which has always been "subsys". This finally
introduces a new mode "capabilities", which will be used
by the LXC driver for device assignment. Since container
based virtualization uses a single kernel, the idea of
assigning physical PCI devices doesn't make sense. It is
still reasonable to assign USB devices, but for assigning
arbitrary nodes in /dev, the new 'capabilities' mode is
to be used.

The first capability support is 'storage', which is for
assignment of block devices. Functionally this is really
pretty similar to the <disk> support. The only difference
is the device node name is identical in both host and
container namespaces.

    <hostdev mode='capabilities' type='storage'>
      <source>
        <block>/dev/sdf1</block>
      </source>
    </hostdev>

The second capability support is 'misc', which is for
assignment of character devices. There is no existing
parallel to this. Again the device node is the same
inside & outside the container.

    <hostdev mode='capabilities' type='misc'>
      <source>
        <char>/dev/input/event3</char>
      </source>
    </hostdev>

The reason for keeping the char & storage devices
separate in the domain XML, is to mirror the split
in the node device XML. NB the node device XML does
not yet report character devices, but that's another
new patch to come

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2012-11-23 13:50:29 +00:00
parent 347a712ab1
commit aae0fc2a92
8 changed files with 455 additions and 82 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
docs/formatdomain.html.in
View File

@ -2123,13 +2123,15 @@
</dd>
</dl>
<h4><a name="elementsUSB">USB and PCI devices</a></h4>
<h4><a name="elementsHostDev">Host device assignment</a></h4>
<h5><a href="elementsHostDevSubsys">USB / PCI devices</a></h5>
<p>
USB and PCI devices attached to the host can be passed through
to the guest using
the <code>hostdev</code> element. <span class="since">since after
0.4.4 for USB and 0.6.0 for PCI (KVM only)</span>:
to the guest using the <code>hostdev</code> element.
<span class="since">since after 0.4.4 for USB and 0.6.0 for PCI
(KVM only)</span>:
</p>
<pre>
@ -2247,6 +2249,51 @@
more details on the address element.
</dl>
<h5><a href="elementsHostDevCaps">Block / character devices</a></h5>
<p>
Block / character devices from the host can be passed through
to the guest using the <code>hostdev</code> element. This is
only possible with container based virtualization.
<span class="since">since after 1.0.1 for LXC</span>:
</p>
<pre>
...
&lt;hostdev mode='capabilities' type='storage'&gt;
&lt;source&gt;
&lt;block&gt;/dev/sdf1&lt;/block&gt;
&lt;/source&gt;
&lt;/hostdev&gt;
...
</pre>
<pre>
...
&lt;hostdev mode='capabilities' type='misc'&gt;
&lt;source&gt;
&lt;char&gt;/dev/input/event3&lt;/char&gt;
&lt;/source&gt;
&lt;/hostdev&gt;
...
</pre>
<dl>
<dt><code>hostdev</code></dt>
<dd>The <code>hostdev</code> element is the main container for describing
host devices. For block/character device passthrough <code>mode</code> is
always "capabilities" and <code>type</code> is "block" for a block
device and "char" for a character device.
</dd>
<dt><code>source</code></dt>
<dd>The source element describes the device as seen from the host.
For block devices, the path to the block device in the host
OS is provided in the nested "block" element, while for character
devices the "char" element is used
</dd>
</dl>
<h4><a name="elementsRedir">Redirected devices</a></h4>
<p>

110
docs/schemas/domaincommon.rng
View File

@ -2834,22 +2834,38 @@
</zeroOrMore>
</element>
</define>
<define name="hostdev">
<element name="hostdev">
<choice>
<group>
<ref name="hostdevsubsys"/>
</group>
<group>
<ref name="hostdevcaps"/>
</group>
</choice>
<optional>
<ref name="alias"/>
</optional>
<optional>
<ref name="deviceBoot"/>
</optional>
<optional>
<ref name="rom"/>
</optional>
<optional>
<ref name="address"/>
</optional>
</element>
</define>
<define name="hostdevsubsys">
<optional>
<attribute name="mode">
<choice>
<value>subsystem</value>
<value>capabilities</value>
</choice>
</attribute>
</optional>
<attribute name="type">
<choice>
<value>usb</value>
<value>pci</value>
</choice>
</attribute>
<optional>
<attribute name="managed">
<choice>
@ -2858,7 +2874,45 @@
</choice>
</attribute>
</optional>
<choice>
<ref name="hostdevsubsyspci"/>
<ref name="hostdevsubsysusb"/>
</choice>
</define>
<define name="hostdevcaps">
<attribute name="mode">
<value>capabilities</value>
</attribute>
<choice>
<group>
<ref name="hostdevcapsstorage"/>
</group>
<group>
<ref name="hostdevcapsmisc"/>
</group>
</choice>
</define>
<define name="hostdevsubsyspci">
<attribute name="type">
<value>pci</value>
</attribute>
<element name="source">
<optional>
<ref name="startupPolicy"/>
</optional>
<element name="address">
<ref name="pciaddress"/>
</element>
</element>
</define>
<define name="hostdevsubsysusb">
<attribute name="type">
<value>usb</value>
</attribute>
<element name="source">
<optional>
<ref name="startupPolicy"/>
@ -2871,26 +2925,32 @@
</optional>
</group>
<ref name="usbaddress"/>
<element name="address">
<ref name="pciaddress"/>
</element>
</choice>
</element>
</group>
<optional>
<ref name="deviceBoot"/>
</optional>
<optional>
<ref name="alias"/>
</optional>
<optional>
<ref name="address"/>
</optional>
<optional>
<ref name="rom"/>
</optional>
</define>
<define name="hostdevcapsstorage">
<attribute name="type">
<value>storage</value>
</attribute>
<element name="source">
<element name="block">
<ref name="absFilePath"/>
</element>
</element>
</define>
<define name="hostdevcapsmisc">
<attribute name="type">
<value>misc</value>
</attribute>
<element name="source">
<element name="char">
<ref name="absFilePath"/>
</element>
</element>
</define>
<define name="usbproduct">
<element name="vendor">
<attribute name="id">

42
src/conf/domain_audit.c
View File

@ -260,6 +260,8 @@ virDomainAuditHostdev(virDomainObjPtr vm, virDomainHostdevDefPtr hostdev,
virt = "?";
}
switch (hostdev->mode) {
case VIR_DOMAIN_HOSTDEV_MODE_SUBSYS:
switch (hostdev->source.subsys.type) {
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI:
if (virAsprintf(&address, "%.4x:%.2x:%.2x.%.1x",
@ -295,6 +297,46 @@ virDomainAuditHostdev(virDomainObjPtr vm, virDomainHostdevDefPtr hostdev,
virt, reason, vmname, uuidstr,
virDomainHostdevSubsysTypeToString(hostdev->source.subsys.type),
device);
break;
case VIR_DOMAIN_HOSTDEV_MODE_CAPABILITIES:
switch (hostdev->source.caps.type) {
case VIR_DOMAIN_HOSTDEV_CAPS_TYPE_STORAGE:
if (!(device = virAuditEncode("disk",
VIR_AUDIT_STR(hostdev->source.caps.u.storage.block)))) {
VIR_WARN("OOM while encoding audit message");
goto cleanup;
}
VIR_AUDIT(VIR_AUDIT_RECORD_RESOURCE, success,
"virt=%s resrc=hostdev reason=%s %s uuid=%s %s",
virt, reason, vmname, uuidstr, device);
break;
case VIR_DOMAIN_HOSTDEV_CAPS_TYPE_MISC:
if (!(device = virAuditEncode("chardev",
VIR_AUDIT_STR(hostdev->source.caps.u.misc.chardev)))) {
VIR_WARN("OOM while encoding audit message");
goto cleanup;
}
VIR_AUDIT(VIR_AUDIT_RECORD_RESOURCE, success,
"virt=%s resrc=hostdev reason=%s %s uuid=%s %s",
virt, reason, vmname, uuidstr, device);
break;
default:
VIR_WARN("Unexpected hostdev type while encoding audit message: %d",
hostdev->source.caps.type);
goto cleanup;
}
break;
default:
VIR_WARN("Unexpected hostdev mode while encoding audit message: %d",
hostdev->mode);
goto cleanup;
}
cleanup:
VIR_FREE(vmname);

173
src/conf/domain_conf.c
View File

@ -536,6 +536,10 @@ VIR_ENUM_IMPL(virDomainHostdevSubsys, VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_LAST,
"usb",
"pci")
VIR_ENUM_IMPL(virDomainHostdevCaps, VIR_DOMAIN_HOSTDEV_CAPS_TYPE_LAST,
"storage",
"misc")
VIR_ENUM_IMPL(virDomainPciRombarMode,
VIR_DOMAIN_PCI_ROMBAR_LAST,
"default",
@ -1442,6 +1446,17 @@ void virDomainHostdevDefClear(virDomainHostdevDefPtr def)
*/
if (def->parent.type == VIR_DOMAIN_DEVICE_NONE)
virDomainDeviceInfoFree(def->info);
if (def->mode == VIR_DOMAIN_HOSTDEV_MODE_CAPABILITIES) {
switch (def->source.caps.type) {
case VIR_DOMAIN_HOSTDEV_CAPS_TYPE_STORAGE:
VIR_FREE(def->source.caps.u.storage.block);
break;
case VIR_DOMAIN_HOSTDEV_CAPS_TYPE_MISC:
VIR_FREE(def->source.caps.u.misc.chardev);
break;
}
}
}
void virDomainHostdevDefFree(virDomainHostdevDefPtr def)
@ -3028,6 +3043,71 @@ error:
return ret;
}
static int
virDomainHostdevDefParseXMLCaps(xmlNodePtr node ATTRIBUTE_UNUSED,
xmlXPathContextPtr ctxt,
const char *type,
virDomainHostdevDefPtr def)
{
xmlNodePtr sourcenode;
int ret = -1;
/* @type is passed in from the caller rather than read from the
* xml document, because it is specified in different places for
* different kinds of defs - it is an attribute of
* <source>/<address> for an intelligent hostdev (<interface>),
* but an attribute of the toplevel element for a standard
* <hostdev>. (the functions we're going to call expect address
* type to already be known).
*/
if (type) {
if ((def->source.caps.type
= virDomainHostdevCapsTypeFromString(type)) < 0) {
virReportError(VIR_ERR_XML_ERROR,
_("unknown host device source address type '%s'"),
type);
goto error;
}
} else {
virReportError(VIR_ERR_XML_ERROR,
"%s", _("missing source address type"));
goto error;
}
if (!(sourcenode = virXPathNode("./source", ctxt))) {
virReportError(VIR_ERR_XML_ERROR, "%s",
_("Missing <source> element in hostdev device"));
goto error;
}
switch (def->source.caps.type) {
case VIR_DOMAIN_HOSTDEV_CAPS_TYPE_STORAGE:
if (!(def->source.caps.u.storage.block =
virXPathString("string(./source/block[1])", ctxt))) {
virReportError(VIR_ERR_XML_ERROR, "%s",
_("Missing <block> element in hostdev storage device"));
goto error;
}
break;
case VIR_DOMAIN_HOSTDEV_CAPS_TYPE_MISC:
if (!(def->source.caps.u.misc.chardev =
virXPathString("string(./source/char[1])", ctxt))) {
virReportError(VIR_ERR_XML_ERROR, "%s",
_("Missing <char> element in hostdev character device"));
goto error;
}
break;
default:
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("address type='%s' not supported in hostdev interfaces"),
virDomainHostdevCapsTypeToString(def->source.caps.type));
goto error;
}
ret = 0;
error:
return ret;
}
int
virDomainDiskFindControllerModel(virDomainDefPtr def,
virDomainDiskDefPtr disk,
@ -7384,6 +7464,11 @@ virDomainHostdevDefParseXML(const xmlNodePtr node,
if (virDomainHostdevDefParseXMLSubsys(node, ctxt, type, def, flags) < 0)
goto error;
break;
case VIR_DOMAIN_HOSTDEV_MODE_CAPABILITIES:
/* parse managed/mode/type, and the <source> element */
if (virDomainHostdevDefParseXMLCaps(node, ctxt, type, def) < 0)
goto error;
break;
default:
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unexpected hostdev mode %d"), def->mode);
@ -7940,6 +8025,41 @@ virDomainHostdevMatchSubsys(virDomainHostdevDefPtr a,
}
static int
virDomainHostdevMatchCapsStorage(virDomainHostdevDefPtr a,
virDomainHostdevDefPtr b)
{
return STREQ_NULLABLE(a->source.caps.u.storage.block,
b->source.caps.u.storage.block);
}
static int
virDomainHostdevMatchCapsMisc(virDomainHostdevDefPtr a,
virDomainHostdevDefPtr b)
{
return STREQ_NULLABLE(a->source.caps.u.misc.chardev,
b->source.caps.u.misc.chardev);
}
static int
virDomainHostdevMatchCaps(virDomainHostdevDefPtr a,
virDomainHostdevDefPtr b)
{
if (a->source.caps.type != b->source.caps.type)
return 0;
switch (a->source.caps.type) {
case VIR_DOMAIN_HOSTDEV_CAPS_TYPE_STORAGE:
return virDomainHostdevMatchCapsStorage(a, b);
case VIR_DOMAIN_HOSTDEV_CAPS_TYPE_MISC:
return virDomainHostdevMatchCapsMisc(a, b);
}
return 0;
}
static int
virDomainHostdevMatch(virDomainHostdevDefPtr a,
virDomainHostdevDefPtr b)
@ -7950,6 +8070,8 @@ virDomainHostdevMatch(virDomainHostdevDefPtr a,
switch (a->mode) {
case VIR_DOMAIN_HOSTDEV_MODE_SUBSYS:
return virDomainHostdevMatchSubsys(a, b);
case VIR_DOMAIN_HOSTDEV_MODE_CAPABILITIES:
return virDomainHostdevMatchCaps(a, b);
}
return 0;
}
@ -12516,6 +12638,35 @@ virDomainHostdevDefFormatSubsys(virBufferPtr buf,
return 0;
}
static int
virDomainHostdevDefFormatCaps(virBufferPtr buf,
virDomainHostdevDefPtr def)
{
virBufferAddLit(buf, "<source>\n");
virBufferAdjustIndent(buf, 2);
switch (def->source.caps.type)
{
case VIR_DOMAIN_HOSTDEV_CAPS_TYPE_STORAGE:
virBufferEscapeString(buf, "<block>%s</block>\n",
def->source.caps.u.storage.block);
break;
case VIR_DOMAIN_HOSTDEV_CAPS_TYPE_MISC:
virBufferEscapeString(buf, "<char>%s</char>\n",
def->source.caps.u.misc.chardev);
break;
default:
virReportError(VIR_ERR_INTERNAL_ERROR,
_("unexpected hostdev type %d"),
def->source.caps.type);
return -1;
}
virBufferAdjustIndent(buf, -2);
virBufferAddLit(buf, "</source>\n");
return 0;
}
static int
virDomainActualNetDefFormat(virBufferPtr buf,
virDomainActualNetDefPtr def,
@ -13588,14 +13739,28 @@ virDomainHostdevDefFormat(virBufferPtr buf,
return -1;
}
break;
case VIR_DOMAIN_HOSTDEV_MODE_CAPABILITIES:
type = virDomainHostdevCapsTypeToString(def->source.caps.type);
if (!type) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("unexpected hostdev type %d"),
def->source.caps.type);
return -1;
}
break;
default:
virReportError(VIR_ERR_INTERNAL_ERROR,
_("unexpected hostdev mode %d"), def->mode);
return -1;
}
virBufferAsprintf(buf, " <hostdev mode='%s' type='%s' managed='%s'>\n",
mode, type, def->managed ? "yes" : "no");
virBufferAsprintf(buf, " <hostdev mode='%s' type='%s'",
mode, type);
if (def->mode == VIR_DOMAIN_HOSTDEV_MODE_SUBSYS)
virBufferAsprintf(buf, " managed='%s'>\n",
def->managed ? "yes" : "no");
else
virBufferAddLit(buf, ">\n");
virBufferAdjustIndent(buf, 6);
switch (def->mode) {
@ -13603,6 +13768,10 @@ virDomainHostdevDefFormat(virBufferPtr buf,
if (virDomainHostdevDefFormatSubsys(buf, def, flags, false) < 0)
return -1;
break;
case VIR_DOMAIN_HOSTDEV_MODE_CAPABILITIES:
if (virDomainHostdevDefFormatCaps(buf, def) < 0)
return -1;
break;
}
virBufferAdjustIndent(buf, -6);

31
src/conf/domain_conf.h
View File

@ -383,6 +383,29 @@ struct _virDomainHostdevSubsys {
} u;
};
enum virDomainHostdevCapsType {
VIR_DOMAIN_HOSTDEV_CAPS_TYPE_STORAGE,
VIR_DOMAIN_HOSTDEV_CAPS_TYPE_MISC,
VIR_DOMAIN_HOSTDEV_CAPS_TYPE_LAST
};
typedef struct _virDomainHostdevCaps virDomainHostdevCaps;
typedef virDomainHostdevCaps *virDomainHostdevCapsPtr;
struct _virDomainHostdevCaps {
int type; /* enum virDOmainHostdevCapsType */
union {
struct {
char *block;
} storage;
struct {
char *chardev;
} misc;
} u;
};
/* basic device for direct passthrough */
struct _virDomainHostdevDef {
virDomainDeviceDef parent; /* higher level Def containing this */
@ -392,12 +415,7 @@ struct _virDomainHostdevDef {
unsigned int missing : 1;
union {
virDomainHostdevSubsys subsys;
struct {
/* TBD: struct capabilities see:
* https://www.redhat.com/archives/libvir-list/2008-July/msg00429.html
*/
int dummy;
} caps;
virDomainHostdevCaps caps;
} source;
virDomainHostdevOrigStates origstates;
virDomainDeviceInfoPtr info; /* Guest address */
@ -2246,6 +2264,7 @@ VIR_ENUM_DECL(virDomainWatchdogAction)
VIR_ENUM_DECL(virDomainVideo)
VIR_ENUM_DECL(virDomainHostdevMode)
VIR_ENUM_DECL(virDomainHostdevSubsys)
VIR_ENUM_DECL(virDomainHostdevCaps)
VIR_ENUM_DECL(virDomainPciRombarMode)
VIR_ENUM_DECL(virDomainHub)
VIR_ENUM_DECL(virDomainRedirdevBus)

1
src/libvirt_private.syms
View File

@ -412,6 +412,7 @@ virDomainGraphicsSpiceZlibCompressionTypeToString;
virDomainGraphicsTypeFromString;
virDomainGraphicsTypeToString;
virDomainHasDiskMirror;
virDomainHostdevCapsTypeToString;
virDomainHostdevDefAlloc;
virDomainHostdevDefClear;
virDomainHostdevDefFree;

34
tests/lxcxml2xmldata/lxc-hostdev.xml Normal file
View File

@ -0,0 +1,34 @@
<domain type='lxc'>
<name>demo</name>
<uuid>8369f1ac-7e46-e869-4ca5-759d51478066</uuid>
<memory unit='KiB'>500000</memory>
<currentMemory unit='KiB'>500000</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type arch='x86_64'>exe</type>
<init>/bin/sh</init>
</os>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<filesystem type='mount' accessmode='passthrough'>
<source dir='/root/container'/>
<target dir='/'/>
</filesystem>
<console type='pty'>
<target type='lxc' port='0'/>
</console>
<hostdev mode='capabilities' type='storage'>
<source>
<block>/dev/sdf1</block>
</source>
</hostdev>
<hostdev mode='capabilities' type='misc'>
<source>
<char>/dev/tty0</char>
</source>
</hostdev>
</devices>
</domain>

1
tests/lxcxml2xmltest.c
View File

@ -121,6 +121,7 @@ mymain(void)
setenv("PATH", "/bin", 1);
DO_TEST("systemd");
DO_TEST("hostdev");
virCapabilitiesFree(caps);