From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jan Beulich" <JBeulich@suse.com>
Subject: Re: [PATCH v3 10/10] x86/MSI-X: provide hypercall
 interface for mask-all control
Date: Tue, 23 Jun 2015 09:13:02 +0100
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>>> On 23.06.15 at 09:29, <roger.pau@citrix.com> wrote:
> FreeBSD never supported PV Dom0 operation, it only had a very minimal
> and crappy i386 PV DomU support which has now been completely removed.
> Maybe you are confusing it with NetBSD, which does have PV Dom0 support
> since a long time ago?

Very likely.

> Yes, FreeBSD only aims to run as PVHVM or PVH (or whatever we call HVM
> without a device model guests). I frankly don't mind trying to change
> this in FreeBSD if there's a good rational behind it. I'm currently
> testing FreeBSD with the change above to see how it behaves.
> 
> Why doesn't Linux use the low 256 bytes of the config space and instead
> uses the IO ports with PCIe devices?

See
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit?id=a0ca9909609470ad779b9b9cc68ce96e975afff7

Jan