[3.13.y.z extended stable] Patch "KVM: x86: Emulator does not decode clflush well" has been added to staging queue

[Paolo Bonzini]

>> From 3cf1cc997f89242c852dca2469ca4303348d29a5 Mon Sep 17 00:00:00 2001
>> From: Nadav Amit <namit at cs.technion.ac.il>
>> Date: Mon, 13 Oct 2014 13:04:13 +0300
>> Subject: KVM: x86: Emulator does not decode clflush well
>>
>> commit 13e457e0eebf0a0c82c38ceb890d93eb826d62a6 upstream.
>>
>> Currently, all group15 instructions are decoded as clflush (e.g., mfence,
>> xsave).  In addition, the clflush instruction requires no prefix (66/f2/f3)
>> would exist. If prefix exists it may encode a different instruction (e.g.,
>> clflushopt).
>>
>> Creating a group for clflush, and different group for each prefix.
>>
>> This has been the case forever, but the next patch needs the cflush group
>> in order to fix a bug introduced in 3.17.
> 
> Given the above ^^^
> 
>> Fixes: 41061cdb98a0bec464278b4db8e894a3121671f5
> 
> And the fact that this commit isn't present in 3.13, I'm not sure this
> patch is relevant for this stable kernel.  Could someone confirm this
> please?

Yes, indeed I thought the "Fixes:" header was also used to find which
commits should go in which stable kernel.

Paolo