Re: [Xen-devel] [PATCH 0/8] kexec: extended kexec hypercall for use with pv-ops kernels

[David Vrabel <david.vrabel@citrix.com>]

On 22/02/13 08:17, Jan Beulich wrote:
>>>> On 21.02.13 at 18:48, David Vrabel <david.vrabel@citrix.com> wrote:
>> The series improves the kexec hypercall by making Xen responsible for
>> loading and relocating the image.  This allows kexec to be usable by
>> pv-ops kernels and should allow kexec to be usable from a HVM or PVH
>> privileged domain.
>>
>> The first patch is a simple clean-up.
>>
>> The second patch allows hypercall structures to be ABI compatible
>> between 32- and 64-bit guests (by reusing stuff present for domctls
>> and sysctls).  This seems better than having to keep adding compat
>> handling for new hypercalls etc.
>>
>> Patch 3 introduces the new ABI.
>>
>> Patch 4 and 5 nearly completely reimplement the kexec load, unload and
>> exec sub-ops.  The old load_v1 sub-op is then implemented on top of
>> the new code.
>>
>> Patch 6 calls the kexec image when dom0 crashes.  This avoids having
>> to alter dom0 kernels to do a exec sub-op call on crash -- an existing
>> SHUTDOWN_crash.
> 
> Am I right in understanding that at this point no kexec support is
> necessary in the Dom0 kernel at all anymore? If so, that's a very
> nice move - thanks for doing that!

Yes.  It will kexec slightly later than it would on native (or classic)
but I don't think this will be a problem in practice.

David

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