From bf20251048534022efe21785f98949c772ce7a71 Mon Sep 17 00:00:00 2001
From: Laine Stump
Date: Thu, 25 Jun 2015 13:30:23 -0400
Subject: [PATCH] conf: add new subelement with name attribute to
This new subelement is used in PCI controllers: the toplevel
*attribute* "model" of a controller denotes what kind of PCI
controller is being described, e.g. a "dmi-to-pci-bridge",
"pci-bridge", or "pci-root". But in the future there will be different
implementations of some of those types of PCI controllers, which
behave similarly from libvirt's point of view (and so should have the
same model), but use a different device in qemu (and present
themselves as a different piece of hardware in the guest). In an ideal
world we (i.e. "I") would have thought of that back when the pci
controllers were added, and used some sort of type/class/model
notation (where class was used in the way we are now using model, and
model was used for the actual manufacturer's model number of a
particular family of PCI controller), but that opportunity is long
past, so as an alternative, this patch allows selecting a particular
implementation of a pci controller with the "name" attribute of the
subelement, e.g.:
In this case, "dmi-to-pci-bridge" is the kind of controller (one that
has a single PCIe port upstream, and 32 standard PCI ports downstream,
which are not hotpluggable), and the qemu device to be used to
implement this kind of controller is named "i82801b11-bridge".
Implementing the above now will allow us in the future to add a new
kind of dmi-to-pci-bridge that doesn't use qemu's i82801b11-bridge
device, but instead uses something else (which doesn't yet exist, but
qemu people have been discussing it), all without breaking existing
configs.
(note that for the existing "pci-bridge" type of PCI controller, both
the model attribute and name are 'pci-bridge'. This is just a
coincidence, since it turns out that in this case the device name in
qemu really is a generic 'pci-bridge' rather than being the name of
some real-world chip)
---
docs/formatdomain.html.in | 13 ++++++
docs/schemas/domaincommon.rng | 13 ++++++
src/conf/domain_conf.c | 46 ++++++++++++++++++-
src/conf/domain_conf.h | 16 +++++++
src/libvirt_private.syms | 2 +
tests/qemuxml2argvdata/qemuxml2argv-q35.xml | 8 +++-
.../qemuxml2xmloutdata/qemuxml2xmlout-q35.xml | 8 +++-
7 files changed, 100 insertions(+), 6 deletions(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index c0a265a49f..33db6a5c20 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -3043,6 +3043,19 @@
are recent enough to support 64-bit PCI holes, unless this is disabled
(set to 0). Since 1.1.2 (QEMU only)
+
+ PCI controllers also have an optional
+ subelement <model>
with an attribute
+ name
. The name attribute holds the name of the
+ specific device that qemu is emulating (e.g. "i82801b11-bridge")
+ rather than simply the class of device ("dmi-to-pci-bridge",
+ "pci-bridge"), which is set in the controller element's
+ model attribute. In almost all cases, you should not
+ manually add a <model>
subelement to a
+ controller, nor should you modify one that is automatically
+ generated by libvirt. Since 1.2.19 (QEMU
+ only).
+
For machine types which provide an implicit PCI bus, the pci-root
controller with index=0 is auto-added and required to use PCI devices.
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 1120003518..a4c1c9b578 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -1731,6 +1731,19 @@
pci
+
+
+
+
+
+ pci-bridge
+
+ i82801b11-bridge
+
+
+
+
+
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 18e626985c..b04f20503e 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -326,6 +326,12 @@ VIR_ENUM_IMPL(virDomainControllerModelPCI, VIR_DOMAIN_CONTROLLER_MODEL_PCI_LAST,
"pci-bridge",
"dmi-to-pci-bridge")
+VIR_ENUM_IMPL(virDomainControllerPCIModelName,
+ VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_LAST,
+ "none",
+ "pci-bridge",
+ "i82801b11-bridge")
+
VIR_ENUM_IMPL(virDomainControllerModelSCSI, VIR_DOMAIN_CONTROLLER_MODEL_SCSI_LAST,
"auto",
"buslogic",
@@ -7802,6 +7808,8 @@ virDomainControllerDefParseXML(xmlNodePtr node,
char *queues = NULL;
char *cmd_per_lun = NULL;
char *max_sectors = NULL;
+ bool processedModel = false;
+ char *modelName = NULL;
xmlNodePtr saved = ctxt->node;
int rc;
@@ -7845,6 +7853,15 @@ virDomainControllerDefParseXML(xmlNodePtr node,
queues = virXMLPropString(cur, "queues");
cmd_per_lun = virXMLPropString(cur, "cmd_per_lun");
max_sectors = virXMLPropString(cur, "max_sectors");
+ } else if (xmlStrEqual(cur->name, BAD_CAST "model")) {
+ if (processedModel) {
+ virReportError(VIR_ERR_XML_ERROR, "%s",
+ _("Multiple elements in "
+ "controller definition not allowed"));
+ goto error;
+ }
+ modelName = virXMLPropString(cur, "name");
+ processedModel = true;
}
}
cur = cur->next;
@@ -7953,6 +7970,15 @@ virDomainControllerDefParseXML(xmlNodePtr node,
def->opts.pciopts.pcihole64size = VIR_DIV_UP(bytes, 1024);
}
}
+ if (modelName &&
+ (def->opts.pciopts.modelName
+ = virDomainControllerPCIModelNameTypeFromString(modelName)) <= 0) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("Unknown PCI controller model name '%s'"),
+ modelName);
+ goto error;
+ }
+ break;
default:
break;
@@ -7977,6 +8003,7 @@ virDomainControllerDefParseXML(xmlNodePtr node,
VIR_FREE(queues);
VIR_FREE(cmd_per_lun);
VIR_FREE(max_sectors);
+ VIR_FREE(modelName);
return def;
@@ -18988,7 +19015,8 @@ virDomainControllerDefFormat(virBufferPtr buf,
{
const char *type = virDomainControllerTypeToString(def->type);
const char *model = NULL;
- bool pcihole64 = false;
+ const char *modelName = NULL;
+ bool pcihole64 = false, pciModel = false;
if (!type) {
virReportError(VIR_ERR_INTERNAL_ERROR,
@@ -19028,17 +19056,31 @@ virDomainControllerDefFormat(virBufferPtr buf,
case VIR_DOMAIN_CONTROLLER_TYPE_PCI:
if (def->opts.pciopts.pcihole64)
pcihole64 = true;
+ if (def->opts.pciopts.modelName != VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_NONE)
+ pciModel = true;
break;
default:
break;
}
- if (def->queues || def->cmd_per_lun || def->max_sectors ||
+ if (pciModel ||
+ def->queues || def->cmd_per_lun || def->max_sectors ||
virDomainDeviceInfoNeedsFormat(&def->info, flags) || pcihole64) {
virBufferAddLit(buf, ">\n");
virBufferAdjustIndent(buf, 2);
+ if (pciModel) {
+ modelName = virDomainControllerPCIModelNameTypeToString(def->opts.pciopts.modelName);
+ if (!modelName) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("unexpected model name value %d"),
+ def->opts.pciopts.modelName);
+ return -1;
+ }
+ virBufferAsprintf(buf, "\n", modelName);
+ }
+
if (def->queues || def->cmd_per_lun || def->max_sectors) {
virBufferAddLit(buf, "queues)
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 698a4d245a..fa9937bdd0 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -756,6 +756,14 @@ typedef enum {
VIR_DOMAIN_CONTROLLER_MODEL_PCI_LAST
} virDomainControllerModelPCI;
+typedef enum {
+ VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_NONE,
+ VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_PCI_BRIDGE,
+ VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_I82801B11_BRIDGE,
+
+ VIR_DOMAIN_CONTROLLER_PCI_MODEL_NAME_LAST
+} virDomainControllerPCIModelName;
+
typedef enum {
VIR_DOMAIN_CONTROLLER_MODEL_SCSI_AUTO,
VIR_DOMAIN_CONTROLLER_MODEL_SCSI_BUSLOGIC,
@@ -797,6 +805,13 @@ typedef virDomainPCIControllerOpts *virDomainPCIControllerOptsPtr;
struct _virDomainPCIControllerOpts {
bool pcihole64;
unsigned long pcihole64size;
+
+ /* the exact controller name is in the "model" subelement, e.g.:
+ *
+ *
+ * ...
+ */
+ int modelName; /* the exact name of the device in hypervisor */
};
/* Stores the virtual disk controller configuration */
@@ -2978,6 +2993,7 @@ VIR_ENUM_DECL(virDomainDiskDiscard)
VIR_ENUM_DECL(virDomainDiskMirrorState)
VIR_ENUM_DECL(virDomainController)
VIR_ENUM_DECL(virDomainControllerModelPCI)
+VIR_ENUM_DECL(virDomainControllerPCIModelName)
VIR_ENUM_DECL(virDomainControllerModelSCSI)
VIR_ENUM_DECL(virDomainControllerModelUSB)
VIR_ENUM_DECL(virDomainFS)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index e5d8437adf..45f42f5020 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -192,6 +192,8 @@ virDomainControllerModelSCSITypeFromString;
virDomainControllerModelSCSITypeToString;
virDomainControllerModelUSBTypeFromString;
virDomainControllerModelUSBTypeToString;
+virDomainControllerPCIModelNameTypeFromString;
+virDomainControllerPCIModelNameTypeToString;
virDomainControllerRemove;
virDomainControllerTypeToString;
virDomainCpuPlacementModeTypeFromString;
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-q35.xml b/tests/qemuxml2argvdata/qemuxml2argv-q35.xml
index 05967a409c..132c15f452 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-q35.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-q35.xml
@@ -20,8 +20,12 @@
-
-
+
+
+
+
+
+
diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-q35.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-q35.xml
index 9dd41623ed..4d8fc5f739 100644
--- a/tests/qemuxml2xmloutdata/qemuxml2xmlout-q35.xml
+++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-q35.xml
@@ -20,8 +20,12 @@
-
-
+
+
+
+
+
+