Re: [kvm-ia64-devel] [PATCH 0/4] ia64/xen: paravirtualization of hand written assembly code

From: Keith Owens <kaos_at_ocs.com.au>
Date: 2008-02-26 00:33:12
tgingold@free.fr (on Mon, 25 Feb 2008 13:54:48 +0100) wrote:
>Quoting Keith Owens <kaos@ocs.com.au>:
>{...}
>> A combination of options (2) and (3) would work.  Have a single source
>> file for the IVT, using conditional macros.  Use that source file to
>> build (at least) two copies of the IVT, for native and any virtualized
>> modes.  The native copy of the IVT starts at label ia64_ivt in section
>> .text.ivt, as it does now.  Any IVT versions for virtualized mode are
>> defined as __cpuinitdata, so they are discarded after boot, unless
>> CONFIG_HOTPLUG_CPU=y.  arch/ia64/kernel/head.S copies the relevant
>> virtualized version over ia64_ivt when necessary, before initializing
>> cr.iva.
>>
>> Single source for maintenance.  No indirect function overhead at run
>> time.  Binary patching at boot time for the right mode.  No wasted
>> space in the kernel.
>
>Good idea.  The linker script will be slightly more complex however...

Don't see why the linker script needs to change at all.  The existing
native IVT is at label ia64_ivt in section .text.ivt, as it is now.
arch/ia64/kernel/head.S simply overwrites ia64_ivt with 32K of data for
the virtualized IVT, copying from another data area.  AFAICT, nothing
in that process requires linker changes.

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Received on Tue Feb 26 00:33:52 2008

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