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xen-blkback: default to X86_32 ABI on x86

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Prior to the existance of 64-bit backends using the X86_64 ABI,
frontends used the X86_32 ABI.  These old frontends do not specify the
ABI and when used with a 64-bit backend do not work.

On x86, default to the X86_32 ABI if one is not specified.  Backends
on ARM continue to default to their NATIVE ABI.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
This commit is contained in:
David Vrabel 2015-02-05 17:09:56 +00:00
parent 3bb8c98e56
commit b042a3ca94
2 changed files with 11 additions and 2 deletions
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9
drivers/block/xen-blkback/common.h
View File

@ -214,6 +214,15 @@ enum blkif_protocol {
BLKIF_PROTOCOL_X86_64 = 3,
};
/*
* Default protocol if the frontend doesn't specify one.
*/
#ifdef CONFIG_X86
# define BLKIF_PROTOCOL_DEFAULT BLKIF_PROTOCOL_X86_32
#else
# define BLKIF_PROTOCOL_DEFAULT BLKIF_PROTOCOL_NATIVE
#endif
struct xen_vbd {
/* What the domain refers to this vbd as. */
blkif_vdev_t handle;

4
drivers/block/xen-blkback/xenbus.c
View File

@ -868,11 +868,11 @@ static int connect_ring(struct backend_info *be)
return err;
}
be->blkif->blk_protocol = BLKIF_PROTOCOL_NATIVE;
be->blkif->blk_protocol = BLKIF_PROTOCOL_DEFAULT;
err = xenbus_gather(XBT_NIL, dev->otherend, "protocol",
"%63s", protocol, NULL);
if (err)
strcpy(protocol, "unspecified, assuming native");
strcpy(protocol, "unspecified, assuming default");
else if (0 == strcmp(protocol, XEN_IO_PROTO_ABI_NATIVE))
be->blkif->blk_protocol = BLKIF_PROTOCOL_NATIVE;
else if (0 == strcmp(protocol, XEN_IO_PROTO_ABI_X86_32))