Date: Wed, 16 Oct 2019 12:19:39 +0200 From: Roger Pau =?iso-8859-1?Q?Monn=E9?= <roger.pau@citrix.com> To: Stefan Parvu <sparvu@kronometrix.org> Cc: <freebsd-xen@freebsd.org> Subject: Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930 Message-ID: <20191016101939.GH14005@Air-de-Roger> In-Reply-To: <CB3EF91B-4B28-4071-859C-BAFC6852B0C4@kronometrix.org> References: <DEEE41ED-5D88-439B-B583-7C3450C696FF@kronometrix.org> <20191016084050.GD14005@Air-de-Roger> <4D6CBDA5-711B-4501-AFC1-A41D1134EF73@kronometrix.org> <20191016090022.GE14005@Air-de-Roger> <9D9848D6-2634-4777-9EE0-8DECAD2FE5CD@kronometrix.org> <20191016091230.GF14005@Air-de-Roger> <D812AE11-3DAC-4A0D-A576-50006DCBA1A5@kronometrix.org> <20191016092823.GG14005@Air-de-Roger> <CB3EF91B-4B28-4071-859C-BAFC6852B0C4@kronometrix.org>
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On Wed, Oct 16, 2019 at 01:09:11PM +0300, Stefan Parvu wrote: > thank you guys for tips. > > > Are you sure it's VT-d and not VT-x what you have enabled in the BIOS? > > Yes, I think the ASUS BIOS had listed VT-d. But will double check tonight. But it might be > that the CPU does not support VT-d. Thats very true. Hmmm. Is there any point even to > update the CPU on this system, would it even support some new CPU models ? I'm afraid I have no idea. I don't deal with hardware setup myself. > > Linux dom0 would likely be in PV mode (note the missing H), which > > doesn't require an iommu. OTOH FreeBSD only supports PVH dom0, which > > does require an iommu. > > Right. It could be tat I was using PV mode (paravirtualisation) mode, without HVM > extensions which PVH uses. Right ? Thats I cant say. It was some time back. So in order to provide an overview: - PV doesn't require VT-x nor VT-d. - PV guests with pci-passthrough devices require VT-d for safety reasons. - PVH/HVM require VT-x. - PVH dom0 or HVM/PVH guests with pci-passthrough devices require both VT-d and VT-x. Roger.
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