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Re: [Qemu-devel] [PATCH] pc_piix: enable legacy hotplug for Xen
From: |
Stefano Stabellini |
Subject: |
Re: [Qemu-devel] [PATCH] pc_piix: enable legacy hotplug for Xen |
Date: |
Wed, 5 Feb 2014 17:53:44 +0000 |
User-agent: |
Alpine 2.02 (DEB 1266 2009-07-14) |
On Wed, 5 Feb 2014, Paolo Bonzini wrote:
> Il 05/02/2014 17:54, Stefano Stabellini ha scritto:
> > > > I'm not sure how this is related to fw_cfg? fw_cfg is just a simple
> > > key-value
> > > > store. If hvmloader doesn't use it, it should be a burden.
> > I was referring to the fact that QEMU might not have all the info that
> > need to be written to fw_cfg when running on Xen: some of the info might
> > be in the hypervisor and some other in another QEMU instance.
> > Or do you think that fw_cfg could be written by multiple entities
> > simultaneously?
>
> Wouldn't it be possible to fetch the necessary information via hypercalls or
> in xenstore?
Probably, at least for the single QEMU case.
> It's possible that some particular fw_cfg entries will be skipped for Xen, but
> most of them should apply. fw_cfg support would also make it possible to use
> -kernel/-initrd in Xen HVM machines, for example.