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Re: [Xen-devel] Vanilla Linux 64-bit paravirt guest support

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: Re: [Xen-devel] Vanilla Linux 64-bit paravirt guest support
From: Michael Abd-El-Malek <mabdelmalek@xxxxxxx>
Date: Thu, 10 Apr 2008 11:14:07 -0400
Cc: Mark McLoughlin <markmc@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Eduardo Habkost <ehabkost@xxxxxxxxxx>
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On Apr 10, 2008, at 10:57 AM, Jeremy Fitzhardinge wrote:
Michael Abd-El-Malek wrote:
On Apr 10, 2008, at 10:11 AM, Mark McLoughlin wrote:
On Thu, 2008-04-10 at 09:01 -0500, Jeremy Fitzhardinge wrote:
Michael Abd-El-Malek wrote:
Is 64-bit domU support available anywhere at the moment? For example,
what is the status of the git://git.et.redhat.com/xen-pvops-64.git
tree? I pulled that tree and tried building 64-bit Xen domU support
(since this tree allows you to configure the kernel with that
capability, unlike the vanilla Linux tree). But compilation failed in
enlighten.c because xen_smp_ops isn't defined in x86_64.

Try building without CONFIG_SMP, it doesn't support that yet.

Other than SMP support, does the tree represent a fully functional 64-bit PV domU support? Does it also allow all hypercalls? Put another way: is a 64-bit PV domU from that tree less capable than a 64-bit PV domU from Xen's linux- tree?

The 32-bit domU implementation is less capable than 2.6.18-xen. For example, it does not yet support suspend/resume/migrate or ballooning, and a number of interesting features are not yet in a released kernel (pvfb). Further out I hope we'll get things like dom0 support in as well.

For my purposes, suspend/resume/migrate isn't required. But I might need ballooning. Would I be able to take the balloon driver from and use it in those new trees? The new tree seems to have all the hypercalls and defines the increase_reservation/ decrease_reservation op codes. I can add the stub code for these calls.

(I'm not sure what you mean by "allow all hypercalls"; do you mean "all features"?)

I was thinking along the lines of grant hypercalls for mapping another domU's grants. HVM can't let me do that. But I need to be able to do this for my work.


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