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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2012-01-25 00:13:20 -0500
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2012-01-27 11:14:16 -0500
commit69e8f430e243d657c2053f097efebc2e2cd559f0 (patch)
tree5a60cefa0cdfc540a99104b291afcbcfb0c7a39f /drivers
parent6c02b7b1610f873888af20f291c07730889ff0f9 (diff)
downloadlinux-linaro-stable-69e8f430e243d657c2053f097efebc2e2cd559f0.tar.gz
xen/granttable: Disable grant v2 for HVM domains.
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/xen/grant-table.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 1cd94daa71db..b4d4eac761db 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -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) {