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xen/granttable: Disable grant v2 for HVM domains.

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As proper scaffolding for supporting error status is not yet
implemented.

BUG: unable to handle kernel NULL pointer dereference at 0000000000000400
IP: [<ffffffff81375ae9>] gnttab_end_foreign_access_ref_v2+0x29/0x40
PGD 32aa3067 PUD 32a87067 PMD 0
Oops: 0000 [#1] PREEMPT SMP
CPU 0
Modules linked in: sg sr_mod cdrom ata_generic ata_piix libata scsi_mod xen_blkfront xen_netfront fb_sys_fops sysimgblt sysfillrect syscopyarea xen_kbdfront
cmd

Pid: 2307, comm: ip Not tainted 3.3.0-rc1 #1 Xen HVM domU
RIP: 0010:[<ffffffff81375ae9>]  [<ffffffff81375ae9>] gnttab_end_foreign_access_ref_v2+0x29/0x40
RSP: 0018:ffff88003be03d38  EFLAGS: 00010206
RAX: 0000000000000000 RBX: ffff880033210640 RCX: 0000000000000040
RDX: 0000000000002000 RSI: 0000000000000000 RDI: 0000000000000200
RBP: ffff88003be03d38 R08: 0000000000000101 R09: 0000000000000000
R10: dead000000100100 R11: 0000000000000000 R12: ffff88003be03e48
R13: 0000000000000001 R14: ffff880039461c00 R15: 0000000000000200
FS:  00007fb1f84ec700(0000) GS:ffff88003be00000(0000) knlGS:0000000000000000
...

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2012-01-25 00:13:20 -05:00
parent 6c02b7b161
commit 69e8f430e2
1 changed files with 5 additions and 2 deletions
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7
drivers/xen/grant-table.c
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@ -948,9 +948,12 @@ static void gnttab_request_version(void)
int rc;
struct gnttab_set_version gsv;
gsv.version = 2;
if (xen_hvm_domain())
gsv.version = 1;
else
gsv.version = 2;
rc = HYPERVISOR_grant_table_op(GNTTABOP_set_version, &gsv, 1);
if (rc == 0) {
if (rc == 0 && gsv.version == 2) {
grant_table_version = 2;
gnttab_interface = &gnttab_v2_ops;
} else if (grant_table_version == 2) {