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    SubjectRe: [Fastboot] [PATCH 1/1] Allow i386 crash kernels to handle x86_64 dumps
    On Fri, Mar 16, 2007 at 08:50:01AM +0000, Ian Campbell wrote:
    > On Fri, 2007-03-16 at 16:59 +0900, Magnus Damm wrote:
    > > On 3/16/07, Ian Campbell <Ian.Campbell@xensource.com> wrote:
    > > > On Fri, 2007-03-16 at 11:40 +0900, Magnus Damm wrote:
    > > > > Right. And maybe it's a good idea to make sure that this feature is
    > > > > actually supported by kexec-tools before adding code to the kernel?
    > > >
    > > > I sent patches to the fastboot list at the same time I sent these ones
    > > > to support differences in the underlying hypervisor architecture in the
    > > > tools.
    > >
    > > Oh, that's good news. I have not seen them yet...
    > >
    > > > They haven't appeared in the archives yet so I fear they have gone
    > > > astray. I'll resend when I get to the office in a bit.
    > >
    > > ... so please resend.
    > >
    > > We've just frozen the kexec-tools-testing tree for an upcoming
    > > release, but if you resend soon and your patches are trivial you may
    > > be able to talk us into merging your changes before the release..
    >
    > Will resend in about an hour.
    >
    > > > > My gut feeling about this is that you are begging for trouble. The
    > > > > kexec/kdump solution is fragile just by itself, and trying to go
    > > > > between architectures is just going to be painful.
    > > >
    > > > It works fine under Xen and I think going from 64Xen+32Kernel->32Kernel
    > > > makes more sense than going from 64Xen+32Kernel->64Kernel. As I said
    > > > originally I'm not so convinced it makes sense in the native case but I
    > > > see no reason to outlaw it (people get to keep both pieces etc...)
    > >
    > > For kexec I think it is just fine. But for kdump, are you sure things
    > > will work out ok? There are some differences between the i386 and
    > > x86_64 kexec-tools code and I wonder if feeding i386 info into an
    > > x86_64 kernel will work properly.
    >
    > It seems to work fine with Xen. A 32 bit kernel handles the 64 bit dump
    > just fine, my pre-kdump kernel is 32 bit but it doesn't have much to do
    > in this case I think.
    >
    > I don't know about native. My gut feeling is that if the mechanism of
    > actually kexecing between 64 and 32 bit works then there is no problem
    > with the crash dump part of the equation.
    >

    I also think so. If kexec works then kdump should work too. There might
    be small issues here and there but can't think of any major one.

    Thanks
    Vivek
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