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    SubjectRe: [Fastboot] [PATCH 1/1] Allow i386 crash kernels to handle x86_64 dumps
    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..

    > The tools already have support for introducing a SHIM when kexecing
    > between different architectures (at least in the 64->32 direction if I
    > understand kexec-tools-testing/purgatory/arch/i386/compat_x86_64.S and
    > k-t-t.../kexec/arch/i386/compat_x86_64.S correctly). This is really just
    > an extension of that.

    Right, the mode switching code in purgatory.

    > > 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.

    Thanks!

    / magnus
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