PCI devices can be associated with a unique integer index that is
exposed via ACPI. In Linux OS with systemd, this value is used for
provide a NIC device naming scheme that is stable across changes
in PCI slot configuration.
Signed-off-by: Daniel P. Berrangé <berrange@xxxxxxxxxx>
---
docs/formatdomain.rst | 6 +++
docs/schemas/domaincommon.rng | 73 +++++++++++++++++++++++++++++++++++
src/conf/device_conf.h | 3 ++
src/conf/domain_conf.c | 12 ++++++
4 files changed, 94 insertions(+)
diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst
index 7ba32ea9c1..5db0aac77a 100644
--- a/docs/formatdomain.rst
+++ b/docs/formatdomain.rst
@@ -4363,6 +4363,7 @@ Network interfaces
<mac address='52:54:00:5d:c7:9e'/>
<boot order='1'/>
<rom bar='off'/>
+ <acpi index='4'/>
</interface>
</devices>
...
@@ -4389,6 +4390,11 @@ when it's in the reserved VMware range by adding a ``type="static"`` attribute
to the ``<mac/>`` element. Note that this attribute is useless if the provided
MAC address is outside of the reserved VMWare ranges.
+:since:`Since 7.3.0`, one can set the ACPI index against network interfaces.
+With some operating systems (eg Linux with systemd), the ACPI index is used
+to provide network interface device naming, that is stable across changes
+in PCI addresses assigned to the device.
+
:anchor:`<a id="elementsNICSVirtual"/>`
Virtual network
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 2ff7862539..30108b6d4c 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -1441,6 +1441,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
@@ -2432,6 +2435,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
@@ -2860,6 +2866,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
@@ -3517,6 +3526,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
@@ -4143,6 +4155,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
@@ -4283,6 +4298,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
@@ -4535,6 +4553,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
@@ -4939,6 +4960,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
@@ -5008,6 +5032,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
@@ -5040,6 +5067,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
@@ -5118,6 +5148,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
@@ -5162,6 +5195,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
@@ -5189,6 +5225,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
@@ -5284,6 +5323,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<element name="driver">
<ref name="virtioOptions"/>
@@ -5386,6 +5428,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
@@ -5401,6 +5446,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
@@ -5420,6 +5468,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
@@ -5451,6 +5502,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="deviceBoot"/>
</optional>
@@ -6422,6 +6476,16 @@
</element>
</define>
+ <define name="acpi">
+ <element name="acpi">
+ <optional>
+ <attribute name="index">
+ <ref name="unsignedInt"/>
+ </attribute>
+ </optional>
+ </element>
+ </define>
+
<define name="memorydev">
<element name="memory">
<attribute name="model">
@@ -6460,6 +6524,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
</interleave>
</element>
</define>
@@ -6551,6 +6618,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
@@ -7530,6 +7600,9 @@
<optional>
<ref name="alias"/>
</optional>
+ <optional>
+ <ref name="acpi"/>
+ </optional>
<optional>
<ref name="address"/>
</optional>
diff --git a/src/conf/device_conf.h b/src/conf/device_conf.h
index a51bdf10ee..af9a43bff2 100644
--- a/src/conf/device_conf.h
+++ b/src/conf/device_conf.h
@@ -159,6 +159,9 @@ struct _virDomainDeviceInfo {
/* bootIndex is only used for disk, network interface, hostdev
* and redirdev devices */
unsigned int bootIndex;
+ /* Valid for any PCI device. Can be used for NIC to get
+ * stable numbering in Linux */
+ unsigned int acpiIndex;
/* pciConnectFlags is only used internally during address
* assignment, never saved and never reported.
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 1e72171586..ef921ae41a 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -6335,6 +6335,9 @@ virDomainDeviceInfoFormat(virBufferPtr buf,
virBufferAddLit(buf, "/>\n");
}
+ if (info->acpiIndex != 0)
+ virBufferAsprintf(buf, "<acpi index='%u'/>\n", info->acpiIndex);
+
if (info->type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE ||
info->type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_VIRTIO_S390)
/* We're done here */
@@ -6661,6 +6664,7 @@ virDomainDeviceInfoParseXML(virDomainXMLOptionPtr xmlopt,
g_autofree char *romenabled = NULL;
g_autofree char *rombar = NULL;
g_autofree char *aliasStr = NULL;
+ g_autofree char *acpiIndex = NULL;
VIR_XPATH_NODE_AUTORESTORE(ctxt)
virDomainDeviceInfoClear(info);
@@ -6709,6 +6713,14 @@ virDomainDeviceInfoParseXML(virDomainXMLOptionPtr xmlopt,
}
}
+ acpiIndex = virXPathString("string(./acpi/@index)", ctxt);
+ if (acpiIndex &&
+ virStrToLong_ui(acpiIndex, NULL, 10, &info->acpiIndex) < 0) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("Cannot parse ACPI index value '%s'"), acpiIndex);
+ goto cleanup;
+ }
+
if ((address = virXPathNode("./address", ctxt)) &&
virDomainDeviceAddressParseXML(address, info) < 0)
goto cleanup;
--
2.30.2
