[Bug 115451] memset hang on pci device memory using kvm

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=115451

--- Comment #7 from Paolo Bonzini <bonzini@gnu.org> ---
First, RHEL5.8 was released in February 2012, which is 4 years old.  The latest
RHEL release is 5.11 (September 2014).  Second, RHEL5's KVM modules were forked
from the upstream kernel around 2009.  It hasn't had any features added for at
least 5 years.

In any case, this bug tracker is only for the upstream kernel.  Even if the bug
was identified and fixed, you would have to open a support case with Red Hat to
get it in the distribution---and you would probably get it only in RHEL7, or at
most (quite unlikely) in RHEL6, because RHEL5 only has major security fixes
applied at this point in time.

Anyway, from comment 4, it looks like RHEL5 doesn't have support for SSE
instructions (movdqa in this case) to and from PCI BARs.  This is supported in
upstream since April 2012 (generic support for SSE came in March 2011, while
movdqa was added one year later).

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