[libvirt] [PATCH 1/3] Add wide SCSI bus disk address generation support
Daniel Veillard
veillard at redhat.com
Mon Jun 21 11:16:29 UTC 2010
On Thu, Jun 17, 2010 at 11:15:42PM +0200, Matthias Bolte wrote:
> 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);
That looks fine to me,
ACK,
Daniel
--
Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/
daniel at veillard.com | Rpmfind RPM search engine http://rpmfind.net/
http://veillard.com/ | virtualization library http://libvirt.org/
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