On Wed, Aug 14, 2013 at 04:23:17PM +0100, John Haxby wrote: > Hello, > > The crypto/xor module omits a check for osxsave. This is a problem on > sufficiently new hardware but with, for example, a PV guest on a > sufficiently old version of xeni (eg 3.4). This shows up on Amazon EC2 > under a slightly different guise (see > http://blog.picloud.com/2013/01/08/when-ec2-hardware-changes-underneath-you/ > or http://tinyurl.com/bezgbhs). In this case, however, "modprobe xor" will > give something like this: > > [11902.030050] xor: automatically using best checksumming function: > [11902.030746] invalid opcode: 0000 [#1] SMP > [11902.030752] Modules linked in: xor(+) [...] > [11902.030771] CPU: 0 PID: 1287 Comm: modprobe Not tainted 3.10.5 #1 > [...] > [11902.031105] Call Trace: > [11902.031121] [<ffffffffa0160071>] do_xor_speed+0x71/0xc2 [xor] > [11902.031213] [<ffffffffa016012d>] calibrate_xor_blocks+0x6b/0xf3e [xor] > [11902.031217] [<ffffffffa01600c2>] ? do_xor_speed+0xc2/0xc2 [xor] > [11902.031222] [<ffffffff810020e2>] do_one_initcall+0xe2/0x190 > [11902.031249] [<ffffffff810bf00d>] load_module+0x1b9d/0x2640 > > Although this is an explicit modprobe, one more serious side effect of > xor failing like this is that btrfs depends on xor and without it I was > unable to mount a btrfs filesystem. > > The fix is straightforward: add a check for cpu_has_oxsave. This puts xor > in line with the other crypto modules that use avx. Patch applied. Thanks! -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
