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    SubjectRe: [Xen-devel] [PATCH/RFC] Fix xsave bug on older Xen hypervisors
    Il 07/09/2012 16:54, Konrad Rzeszutek Wilk ha scritto:
    >>> But iirc that bad patch is a Linux side one (i.e. you're trying to fix
    >>> something upstream that isn't upstream)?
    >>>
    >> Right, so the patch that this improves upon, and that Fedora and Ubuntu are
    >> currently carrying is not upstream because:
    >>
    >> a) It's crap, it cripples upstream xen users, but doesn't impact RHEL xen
    >> users because xsave was never supported there.
    >>
    >> b) The hypervisor was patched to make it unnecessary quite some time ago,
    >> and we hoped EC2 would eventually pick up that correct patch and we could
    >> drop the crap kernel patch.
    >>
    >> Unfortunately this has not happened. We are at a point where EC2 really is
    >> a quirk that has to be worked around. Distros do not want to maintain
    >> a separate EC2 build of the kernel, so the easiest way is to cripple
    >> current upstream xen users. This quirk is unfortunately the best possible
    >> solution. Having it upstream also makes it possible for any user to build
    >> an upstream kernel that will run on EC2 without having to dig a random
    >> patch out of a vendor kernel.
    >
    > Sure. Jan is asking though for actual confirmation that the upstream kernel
    > does indeed go belly up without a workaround.
    > And whether this patch (which I would did since Canonical is carrying it) does
    > fix the issue.
    >
    > I am still a newbie on the Amazon EC2 upload your kernel thing (hint, would
    > appreciate somebody taking this patch and trying it out).

    You can just pick an old version of the CentOS kernel package, for
    example 2.6.18-128.el5 or 2.6.18-164.el5 (respectively CentOS/RHEL 5.3
    and 5.4).

    Paolo



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