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xen: fix PyGrub boot device order

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When PyGrub is used as the bootloader in Xen, it gets passed the first
bootable disk. Xend supports a "bootable"-flag for this, which isn't
explicitly supported by libvirt.
When converting libvirt-xml to xen-sxpr the "bootable"-flag gets
implicitly set by xen.xend.XenConfig.device_add() for the first disk
(marked as "Compat hack -- mark first disk bootable").
When converting back xen-sxpr to libvirt-xml, the disks are returned in
the internal order used by Xend ignoring the "bootable"-flag, which
loses the original order. When the domain is then re-defined, the order
of disks is changed, which breaks PyGrub, since a different disk gets
passed.

When converting xen-sxpr to libvirt-xml, use the "bootable"-flag to
determine the first disk.

This isn't perfect, since several disks can be marked as bootable using
the Xend-API, but that is not supported by libvirt. In all known cases
relevant to libvirt exactly one disk is marked as bootable.

Signed-off-by: Philipp Hahn <hahn@univention.de>
This commit is contained in:
Philipp Hahn 2011-10-12 10:26:46 +02:00 committed by Eric Blake
parent c58d778d73
commit c2969ec7ae
1 changed files with 11 additions and 1 deletions
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12
src/xenxs/xen_sxpr.c
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@ -348,20 +348,24 @@ xenParseSxprDisks(virDomainDefPtr def,
const char *src = NULL;
const char *dst = NULL;
const char *mode = NULL;
const char *bootable = NULL;
/* Again dealing with (vbd...) vs (tap ...) differences */
if (sexpr_lookup(node, "device/vbd")) {
src = sexpr_node(node, "device/vbd/uname");
dst = sexpr_node(node, "device/vbd/dev");
mode = sexpr_node(node, "device/vbd/mode");
bootable = sexpr_node(node, "device/vbd/bootable");
} else if (sexpr_lookup(node, "device/tap2")) {
src = sexpr_node(node, "device/tap2/uname");
dst = sexpr_node(node, "device/tap2/dev");
mode = sexpr_node(node, "device/tap2/mode");
bootable = sexpr_node(node, "device/tap2/bootable");
} else {
src = sexpr_node(node, "device/tap/uname");
dst = sexpr_node(node, "device/tap/dev");
mode = sexpr_node(node, "device/tap/mode");
bootable = sexpr_node(node, "device/tap/bootable");
}
if (VIR_ALLOC(disk) < 0)
@ -487,7 +491,13 @@ xenParseSxprDisks(virDomainDefPtr def,
if (VIR_REALLOC_N(def->disks, def->ndisks+1) < 0)
goto no_memory;
def->disks[def->ndisks++] = disk;
/* re-order disks if there is a bootable device */
if (STREQ_NULLABLE(bootable, "1")) {
def->disks[def->ndisks++] = def->disks[0];
def->disks[0] = disk;
} else {
def->disks[def->ndisks++] = disk;
}
disk = NULL;
}
}