[libvirt] [PATCH 1/3] Add wide SCSI bus disk address generation support
Matthias Bolte
matthias.bolte at googlemail.com
Thu Jun 17 21:15:42 UTC 2010
The domain XML parsing code autogenerates disk address and
controller elements when they are not explicitly specified.
The code assumes a narrow SCSI bus (7 units per bus). ESX
uses a wide SCSI bus (16 units per bus).
This is a step towards controller support for the ESX driver.
---
src/conf/capabilities.h | 3 +++
src/conf/domain_conf.c | 39 +++++++++++++++++++++++++++++----------
src/conf/domain_conf.h | 2 +-
src/esx/esx_driver.c | 2 ++
src/qemu/qemu_conf.c | 9 +++++----
5 files changed, 40 insertions(+), 15 deletions(-)
diff --git a/src/conf/capabilities.h b/src/conf/capabilities.h
index bdf44fa..9290c82 100644
--- a/src/conf/capabilities.h
+++ b/src/conf/capabilities.h
@@ -24,6 +24,8 @@
#ifndef __VIR_CAPABILITIES_H
# define __VIR_CAPABILITIES_H
+# include <stdbool.h>
+
# include "internal.h"
# include "util.h"
# include "buf.h"
@@ -125,6 +127,7 @@ struct _virCaps {
void (*privateDataFreeFunc)(void *);
int (*privateDataXMLFormat)(virBufferPtr, void *);
int (*privateDataXMLParse)(xmlXPathContextPtr, void *);
+ bool hasWideScsiBus;
};
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 64b5cf3..cac4042 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -1339,7 +1339,7 @@ virDomainParseLegacyDeviceAddress(char *devaddr,
}
int
-virDomainDiskDefAssignAddress(virDomainDiskDefPtr def)
+virDomainDiskDefAssignAddress(virCapsPtr caps, virDomainDiskDefPtr def)
{
int idx = virDiskNameToIndex(def->dst);
if (idx < 0)
@@ -1347,12 +1347,30 @@ virDomainDiskDefAssignAddress(virDomainDiskDefPtr def)
switch (def->bus) {
case VIR_DOMAIN_DISK_BUS_SCSI:
- /* For SCSI we define the default mapping to be 7 units
- * per bus, 1 bus per controller, many controllers */
def->info.type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_DRIVE;
- def->info.addr.drive.controller = idx / 7;
- def->info.addr.drive.bus = 0;
- def->info.addr.drive.unit = idx % 7;
+
+ if (caps->hasWideScsiBus) {
+ /* For a wide SCSI bus we define the default mapping to be
+ * 16 units per bus, 1 bus per controller, many controllers.
+ * Unit 7 is the SCSI controller itself. Therefore unit 7
+ * cannot be assigned to disks and is skipped.
+ */
+ def->info.addr.drive.controller = idx / 15;
+ def->info.addr.drive.bus = 0;
+ def->info.addr.drive.unit = idx % 15;
+
+ /* Skip the SCSI controller at unit 7 */
+ if (def->info.addr.drive.unit >= 7) {
+ ++def->info.addr.drive.unit;
+ }
+ } else {
+ /* For a narrow SCSI bus we define the default mapping to be
+ * 7 units per bus, 1 bus per controller, many controllers */
+ def->info.addr.drive.controller = idx / 7;
+ def->info.addr.drive.bus = 0;
+ def->info.addr.drive.unit = idx % 7;
+ }
+
break;
case VIR_DOMAIN_DISK_BUS_IDE:
@@ -1385,7 +1403,8 @@ virDomainDiskDefAssignAddress(virDomainDiskDefPtr def)
* @param node XML nodeset to parse for disk definition
*/
static virDomainDiskDefPtr
-virDomainDiskDefParseXML(xmlNodePtr node,
+virDomainDiskDefParseXML(virCapsPtr caps,
+ xmlNodePtr node,
int flags) {
virDomainDiskDefPtr def;
xmlNodePtr cur;
@@ -1615,7 +1634,7 @@ virDomainDiskDefParseXML(xmlNodePtr node,
serial = NULL;
if (def->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE
- && virDomainDiskDefAssignAddress(def) < 0)
+ && virDomainDiskDefAssignAddress(caps, def) < 0)
goto error;
cleanup:
@@ -3687,7 +3706,7 @@ virDomainDeviceDefPtr virDomainDeviceDefParse(virCapsPtr caps,
if (xmlStrEqual(node->name, BAD_CAST "disk")) {
dev->type = VIR_DOMAIN_DEVICE_DISK;
- if (!(dev->data.disk = virDomainDiskDefParseXML(node, flags)))
+ if (!(dev->data.disk = virDomainDiskDefParseXML(caps, node, flags)))
goto error;
} else if (xmlStrEqual(node->name, BAD_CAST "filesystem")) {
dev->type = VIR_DOMAIN_DEVICE_FS;
@@ -4237,7 +4256,7 @@ static virDomainDefPtr virDomainDefParseXML(virCapsPtr caps,
if (n && VIR_ALLOC_N(def->disks, n) < 0)
goto no_memory;
for (i = 0 ; i < n ; i++) {
- virDomainDiskDefPtr disk = virDomainDiskDefParseXML(nodes[i],
+ virDomainDiskDefPtr disk = virDomainDiskDefParseXML(caps, nodes[i],
flags);
if (!disk)
goto error;
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index f83de83..701849f 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -999,7 +999,7 @@ int virDomainDiskInsert(virDomainDefPtr def,
virDomainDiskDefPtr disk);
void virDomainDiskInsertPreAlloced(virDomainDefPtr def,
virDomainDiskDefPtr disk);
-int virDomainDiskDefAssignAddress(virDomainDiskDefPtr def);
+int virDomainDiskDefAssignAddress(virCapsPtr caps, virDomainDiskDefPtr def);
int virDomainControllerInsert(virDomainDefPtr def,
virDomainControllerDefPtr controller);
diff --git a/src/esx/esx_driver.c b/src/esx/esx_driver.c
index 1968537..f50e090 100644
--- a/src/esx/esx_driver.c
+++ b/src/esx/esx_driver.c
@@ -228,6 +228,8 @@ esxCapsInit(esxPrivate *priv)
virCapabilitiesSetMacPrefix(caps, (unsigned char[]){ 0x00, 0x0c, 0x29 });
virCapabilitiesAddHostMigrateTransport(caps, "esx");
+ caps->hasWideScsiBus = true;
+
if (esxLookupHostSystemBiosUuid(priv, caps->host.host_uuid) < 0) {
goto failure;
}
diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c
index f096876..1b18a5f 100644
--- a/src/qemu/qemu_conf.c
+++ b/src/qemu/qemu_conf.c
@@ -5019,7 +5019,8 @@ error:
* Will fail if not using the 'index' keyword
*/
static virDomainDiskDefPtr
-qemuParseCommandLineDisk(const char *val,
+qemuParseCommandLineDisk(virCapsPtr caps,
+ const char *val,
int nvirtiodisk)
{
virDomainDiskDefPtr def = NULL;
@@ -5192,7 +5193,7 @@ qemuParseCommandLineDisk(const char *val,
else
def->dst[2] = 'a' + idx;
- if (virDomainDiskDefAssignAddress(def) < 0) {
+ if (virDomainDiskDefAssignAddress(caps, def) < 0) {
qemuReportError(VIR_ERR_INTERNAL_ERROR,
_("invalid device name '%s'"), def->dst);
virDomainDiskDefFree(def);
@@ -6004,7 +6005,7 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
goto no_memory;
}
- if (virDomainDiskDefAssignAddress(disk) < 0)
+ if (virDomainDiskDefAssignAddress(caps, disk) < 0)
goto error;
if (VIR_REALLOC_N(def->disks, def->ndisks+1) < 0) {
@@ -6152,7 +6153,7 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
} else if (STREQ(arg, "-drive")) {
virDomainDiskDefPtr disk;
WANT_VALUE();
- if (!(disk = qemuParseCommandLineDisk(val, nvirtiodisk)))
+ if (!(disk = qemuParseCommandLineDisk(caps, val, nvirtiodisk)))
goto error;
if (VIR_REALLOC_N(def->disks, def->ndisks+1) < 0) {
virDomainDiskDefFree(disk);
--
1.7.0.4
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