Re: [Xen-devel] pvops upstream status

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

Il 17/06/2014 11:52, Juergen Gross ha scritto:
> Hi,
>
> I'd like to update the wiki page
>
> http://wiki.xenproject.org/wiki/XenParavirtOps
>
> 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
>   Dom0)
> - 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.

> - pvSCSI
> - pvUSB
> - oprofile (perf implementation having got started by Boris)
> - some SUSE internal enhancement patches
>
> Done:
> - memory hotplug (available 3.9)
> - ACPI Sx handling (3.11)
> - not using ticket locks (3.12)
> - NMI injection/delivery (3.12)
> - kexec (implementation not requiring a kernel layer in place)
> - MSI-X possibly broken (fixed in 3.14)
> - multi-vector MSI (3.15)
>
> I'll add above stuff to the wiki. Any further information is appreciated
> especially regarding who is currently working on any of the above or not
> mentioned topics. Missing topics not mentioned here with nobody working
> on them are welcomed, too.
>
>
> Juergen
>
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Attachment: blktap2_vs_qdisk.JPG
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