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xen-devel
Re: [Xen-devel] x86_64 SMP status update
* Ian Pratt (m+Ian.Pratt@xxxxxxxxxxxx) wrote:
> Chris -- thanks!
>
> I think we'll try and get Vincent's 2.6.12 upgrade patch checked-in in
> the next day or two.
Great, it's been working well for me. Granted, I'm usually just
crashing the domain, but... ;-)
> On the subject of x86_64 SMP, I personally believe the #1 priority is to
> get x86_64 using writeable page tables. It'll be impossible to make SMP
> work reliably until this is done.
>
> The first step of this is just to stop set_pte using queue_l1_update and
> have it write to the pte directly. Xen is currently hard configured to
> only ever use the emulation path for x86_64 (see ptwr_do_page_fault). I
> suspect that letting it use the 'real' path will probably crash, but
> should be easy to fix up.
OK, I'll take a look.
> Ideally, we should also pull in equivalent code from this chageset for
> i386 so as to remove the static update queues altogether, and to build
> them on the stack as required:
>
> http://xen.bkbits.net:8080/xeno-unstable.bk/cset@xxxxxxxxxxxx
>
> If we do more remerging with i386-xen we should just get this for free.
OK, that looks like good stuff to pull over.
> [BTW: in your SMP patch, any reason not to just merge with the i386-xen
> smpboot.c?]
Sure, one reason, laziness ;-) Just wanted to get the thing going first.
Suppose it's worth considering. Although I think the x86_64 smp boot
code in 2.6.12 is a bit nicer. Food for thought...
thanks,
-chris
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