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Date: Tue, 12 May 2015 17:50:05 +0200
From: =?windows-1252?Q?Roger_Pau_Monn=E9?= <roger.pau@citrix.com>
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To: Ruslan Makhmatkhanov <cvs-src@yandex.ru>, <freebsd-xen@freebsd.org>
Subject: Re: iommu must be enabled for PVH hardware domain
References: <55521A29.9080409@yandex.ru>
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Hello,

El 12/05/15 a les 17.20, Ruslan Makhmatkhanov ha escrit:
> Hello,
> 
> we have machine with VT-d and EPT-capable CPU:
> Intel(R) Xeon(R) CPU E5504 [1]
> 
> The system is FreeBSD 11.0-CURRENT r282694 installed from
> ftp.freebsd.org iso.
> 
> But dom0 fails to boot at this hardware with "iommu must be enabled for
> PVH hardware domain" [2]. VT-d support is indeed not detected at kernel
> level. Here is dmesg with VT-d enabled in BIOS [3] and dmesg with VT-d
> disabled in BIOS [4]. It's look like there is no difference on both
> outputs. Here is the proofpic of that the system is VT-d capable and the
> support is enabled in BIOS [5]. Here is acpidump -t output [6]

My bet right now is be that Xen detects that your IOMMU contains erratas
and disables it. Can you add "iommu=debug,force" to your xen_cmdline and
try again?

Also, can you paste the contents of your /boot/loader.conf?

Roger.