Mailing List Archive

On Fri, 14 Dec 2012, Josh Zhao wrote:
> Hi, I have a new questions about the ARM-Xen. (1)   Following wiki in
> http://wiki.xen.org/wiki/Xen_ARMv7_with_Virtualization_Extensions,  are this repos latest?
>
>     Xen:  http://xenbits.xen.org/hg/xen-unstable.hg
>     Linux Dom0 and DomU: The arm-privcmd-for-3.8 branch of git://xenbits.xen.org/people/ianc/linux.git 

Yes, they are.
However we have few outstanding patches, already sent to the list by me
or Ian, but still unapplied.


> (2)  Is the ARM PV interfaces for IO same as X86?

I guess you are referring to the Linux PV frontend and backend drivers?
Like netfront/netback and blkfront/blkback? If that is the case, then
yes, we are using exactly the same frontend/backend driver pairs as in
Xen x86.

Thanks Stabellini. I saw the slides of New PVH Virtualisation mode for ARM
Cortex A15 and x8<http://blog.xen.org/index.php/2012/09/21/xensummit-sessions-new-pvh-virtualisation-mode-for-arm-cortex-a15arm-servers-and-x86/>,
but can't understand why no PVOPs and no shadow pagetables bacuase of
nasted paging in HW?

josh zhao


2012/12/14 Stefano Stabellini <stefano.stabellini@eu.citrix.com>

> On Fri, 14 Dec 2012, Josh Zhao wrote:
> > Hi, I have a new questions about the ARM-Xen. (1) Following wiki in
> > http://wiki.xen.org/wiki/Xen_ARMv7_with_Virtualization_Extensions, are
> this repos latest?
> >
> > Xen: http://xenbits.xen.org/hg/xen-unstable.hg
> > Linux Dom0 and DomU: The arm-privcmd-for-3.8 branch of git://
> xenbits.xen.org/people/ianc/linux.git
>
> Yes, they are.
> However we have few outstanding patches, already sent to the list by me
> or Ian, but still unapplied.
>
>
> > (2) Is the ARM PV interfaces for IO same as X86?
>
> I guess you are referring to the Linux PV frontend and backend drivers?
> Like netfront/netback and blkfront/blkback? If that is the case, then
> yes, we are using exactly the same frontend/backend driver pairs as in
> Xen x86.

Yes, that is correct: thanks to nested paging in HW we don't need shadow
pagetables in the hypervisor or PVOPS in the Linux kernel.

On Sun, 16 Dec 2012, Josh Zhao wrote:
> Thanks Stabellini. I saw the slides of New PVH Virtualisation mode for ARM Cortex A15 and x8,  but can't understand  why no
> PVOPs and no shadow pagetables bacuase of nasted paging in HW?
> josh zhao
>
>
> 2012/12/14 Stefano Stabellini <stefano.stabellini@eu.citrix.com>
> On Fri, 14 Dec 2012, Josh Zhao wrote:
> > Hi, I have a new questions about the ARM-Xen. (1)   Following wiki in
> > http://wiki.xen.org/wiki/Xen_ARMv7_with_Virtualization_Extensions,  are this repos latest?
> >
> >     Xen:  http://xenbits.xen.org/hg/xen-unstable.hg
> >     Linux Dom0 and DomU: The arm-privcmd-for-3.8 branch of git://xenbits.xen.org/people/ianc/linux.git 
>
> Yes, they are.
> However we have few outstanding patches, already sent to the list by me
> or Ian, but still unapplied.
>
>
> > (2)  Is the ARM PV interfaces for IO same as X86?
>
> I guess you are referring to the Linux PV frontend and backend drivers?
> Like netfront/netback and blkfront/blkback? If that is the case, then
> yes, we are using exactly the same frontend/backend driver pairs as in
> Xen x86.
>
>
>
>