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Date: Thu, 07 Nov 2013 22:21:56 +0100
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Subject: Re: [Qemu-devel] [edk2] [PATCH] exec: fix regression by making
 system-memory region UINT64_MAX size
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To: edk2-devel@lists.sourceforge.net
Cc: Peter Maydell <peter.maydell@linaro.org>, Marcel Apfelbaum <marcel.a@redhat.com>, Jan Kiszka <jan.kiszka@siemens.com>, "Michael S. Tsirkin" <mst@redhat.com>, qemu-devel <qemu-devel@nongnu.org>, Anthony Liguori <anthony@codemonkey.ws>, Laszlo Ersek <lersek@redhat.com>, afaerber <afaerber@suse.de>, rth@twiddle.net

Il 07/11/2013 22:12, Laszlo Ersek ha scritto:
> 0000000000000000-7ffffffffffffffe (prio 0, RW): system
>   [...]
>   0000000060000000-00000000ffffffff (prio 0, RW): alias pci-hole @pci 0000000060000000-00000000ffffffff
>   [...]
>   00000000ffe00000-00000000ffffffff (prio 0, R-): system.flash
> [...]

Priorities are not "transitive" across aliases; once you use an alias to
map a region, the alias's priority counts, not the target region's
priority.  So the INT_MIN priority for pci-master-abort counts *within
the alias*, but the choice between pci-hole and system.flash is only
affected by the priorities of pci-hole and system.flash.

You could give a smaller priority (-1 or INT_MIN) to pci-hole and just
let it occupy the whole address space, from 0 to UINT64_MAX.  Or perhaps
the pci-hole alias is too large and it should end before the system
flash area.  Both solutions should work.

Paolo