Re: [Xen-devel] [PATCHv11 3/9] kexec: add infrastructure for handling kexec images

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 08.11.13 at 13:50, David Vrabel <david.vrabel@xxxxxxxxxx> wrote:
> Add the code needed to handle and load kexec images into Xen memory or
> into the crash region.  This is needed for the new KEXEC_CMD_load and
> KEXEC_CMD_unload hypercall sub-ops.

I know it's late in the game, but just now I started getting the
impression that this introduced a new limitation that needs to
be taken into consideration elsewhere: With the old
implementation it was the kernel's responsibility to write to
the reserved space or, where Xen needed to touch the space,
it did so via fixmap entries. Hence there was no need for the
area to have corresponding struct page_info.

The new code, however, appears to make assumptions that
the memory used here is part of the range covered by the
frame table, and hence setup.c's determination of the base
address would need to be adjusted accordingly. (I realize
that this only matters on systems having more RAM than the
hypervisor can make use of.)

Jan


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