[PATCH libpciaccess] linux: support 32 bit PCI domains (v3)

[Eric Anholt]

Adam Jackson <ajax at redhat.com> writes:

> From: Stephen Hemminger <stephen at networkplumber.org>
>
> The PCI domain may be larger than 16 bits on Microsoft Azure and other
> virtual environments. PCI busses reported by ACPI are limited to 16
> bits, but in Azure the domain value for pass through devices is
> intentionally larger than 16 bits to avoid clashing with local devices.
> This is needed to support pass through of GPU devices.
>
> v3: (ajax)
> Update FreeBSD and Solaris backends to preserve the full 32-bit domain
> number, since on those OSes it stands a chance of working already.
> Update NetBSD and OpenBSD backends to initialize domain_16 compatibly
> with older libpciaccess; neither backend appears to support more than a
> handful of domains to begin with though. Trivially update the generic
> x86 backend for source compatibility, though it still only supports one
> domain and will never be better.
>
> Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=101744
> Signed-off-by: Stephen Hemminger <sthemmin at microsoft.com>

Reviewed-by: Eric Anholt <eric at anholt.net>
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