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Re: [Xen-devel] pvops upstream status

Il 17/06/2014 15:34, Juergen Gross ha scritto:
On 06/17/2014 12:55 PM, Fabio Fantoni wrote:
Il 17/06/2014 11:52, Juergen Gross ha scritto:

I'd like to update the wiki page


regarding the current status of the pvops kernel. I've just started to
collect the missing bits and who is working on them. Up to now I have a
SUSE internal list, some data from Konrad, and, of course, the EFI
patches sent by Daniel last week:

- EFI support (patches posted by Daniel Kiper on 13.06.2014)
- use of PAT (i.e. WC memory type) not possible
- microcode loader (runtime)
- 500Gb+ support
- expected to be dead (under Xen) code cannot be easily verified to
  indeed be dead (e.g. IOMMU, PCI ATS, PRI, and PASID), leaving the
  risk of bad interaction between hypervisor and Dom0 if a new, active
  user of that code appears and goes unnoticed
- user mode pvclock
- possibly not suitable for pre-4.0.1 hypervisor (definitely not as
- blktap (blktap3 replacement stalled)

I think blktap is no more needed, qdisk of qemu upstream (already used
by xen) has much superior performance.
One my first benchmark of long time ago in attachment.

Okay, noted. We'll have to verify that all blktap protocols and
scenarios are handled properly and with good performance by qdisk.

Thanks, Juergen
My test was only with raw image, for what I read time ago probably the only problem should be with vhd format they said needed improvements on qemu but they might have done in the meantime (if I remember good I read it 2 year ago).

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