[PATCH] fix ia64 breakage with PHYSDEVOP_pirq_eoi_mfn (was Re: [PATCH 2/2] linux/x86: use shared page indicating the need for an EOI notification)

["Jan Beulich" <jbeulich@novell.com>]

>>> Isaku Yamahata <yamahata@valinux.co.jp> 03.12.08 03:07 >>>
>Hi Jan. Thank you for taking care of not breaking existing code.
>However there is an ia64 specific issue in this patch.
>Here is the patch to fix it.

I'm sorry for that, I really tried to not break ia64.

>And I have an issue:
>MFN is passed from a guest to the VMM to indicate a page in guest.
>However I think GMFN should be used, instead of MFN like
>grant table, xenoprof and other hypercalls.
>I'll post two patches to rename the related stuff.

Hmm, I know too little about ia64 Xen to understand the significance of
that difference.

>evtchn, physdev: fix pirq_eoi_mfn for IA64 support.
>
>On ia64, global variables aren't in identity mapping area (i.e. kaddr)
>so that there is no relationship between its virtual address and
>its physical address. Thus virt_to_bus() can't be applied to them.
>So introduce arbitrary_virt_to_bus() to wrap arch dependent function
>and make use of it.

The same applies to x86-64, but virt_to_bus() (or rather the underlying
virt_to_phys()) is prepared to deal with that situation. So it rather sounds
like a shortcoming of the ia64 variant to me...

Jan