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Re: [Xen-users] PVH

On 07/04/2016 03:22 AM, Roger Pau Monné wrote:
On Thu, Jun 23, 2016 at 08:11:23AM -0700, Mike Wright wrote:
Hi all,

I have questions about Xen PVH.

Domain0 and guest are both stock ubuntu-16.04 with kernel 4.4.0-22-generic
compiled with XEN_PVH=y; booting with xen-4.6-amd64 hypervisor.

Both run fine, however when the option "pvh = 1" is added to the domU config
file it fails with: "...creation fail: Invalid argument".

Are there other requirements?  If it matters the CPU doesn't support IOMMU.

You CPU must be Intel and have support for EPT in order to use classic PVH
guests. You can check if your CPU supports EPT by doing a `xl dmesg` and
grepping for "Extended Page Tables (EPT)".

Thanks for your reply Roger.

I was misinformed about the Phenom II processors: they all have IOMMU and NPT (AMD equivalent of EPT), the bottleneck appears to be motherboards lacking chipset and/or BIOS support.

I guess what I need to know is if Xen supports all virtualization modes for AMD systems with IOMMU and NPT capabilities and, if not, whether they ever intend to.

Do you know which Xen list this question might best be directed?

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