El 12/05/15 a les 17.20, Ruslan Makhmatkhanov ha escrit:
> we have machine with VT-d and EPT-capable CPU:
> Intel(R) Xeon(R) CPU E5504 
> 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" . VT-d support is indeed not detected at kernel
> level. Here is dmesg with VT-d enabled in BIOS  and dmesg with VT-d
> disabled in BIOS . 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 . Here is acpidump -t output 
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
Also, can you paste the contents of your /boot/loader.conf?
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