[Xen-ia64-devel] [PATCH] preparation for vga acceleration of VTI domain

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

This patch fixes several minor issues, as a prepare step to support VGA 
acceleration for VTI domain:

- shared vram buffer needs to be mapped as WB in both sides, because 
the shared vram is the true WB memory though VTI domain is told as UC
- Introduced a new pte_mem to indicate p2m entry containing valid mfn 
when replace p2m entry. Pte_none doesn't work for VTI case, since IO 
type is encoded into p2m entry which however doesn't contain valid mfn.
  
After above change, guest_physmap_add/remove_page is available to 
be used by qemu to setup linear buffer for VTI domain.

Signed-off-by Kevin Tian <kevin.tian@xxxxxxxxx>

Thanks,
Kevin

Attachment: vga_accl_prepare.patch
Description: vga_accl_prepare.patch

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