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Re: [Xen-devel] Xen PVH support in grub2
From: |
Roger Pau Monné |
Subject: |
Re: [Xen-devel] Xen PVH support in grub2 |
Date: |
Fri, 3 Nov 2017 18:37:38 +0000 |
User-agent: |
NeoMutt/20171013 |
On Fri, Nov 03, 2017 at 07:23:50PM +0100, Juergen Gross wrote:
> On 03/11/17 19:19, Boris Ostrovsky wrote:
> > On 11/03/2017 02:05 PM, Juergen Gross wrote:
> >>
> >> So again the question: how to tell whether we are PVH or HVM in
> >> init_hypervisor_platform()? ACPi tables are scanned way later...
> >
> > Can we make grub/OVMF append a boot option?
> >
> > Or set setup_header.hardware_subarch to something? We already have
> > X86_SUBARCH_XEN but it is only used by PV. Or we might be able to use
> > hardware_subarch_data (will need to get a buy-in from x86 maintainers, I
> > think).
>
> But wouldn't this break the idea to reuse the native boot paths in
> grub/OVMF without further modifications?
>
> I'd rather have a way to ask the hypervisor whether we are in PVH mode
> (e.g. via CPUID or a hypercall to test for a devicemodel having itself
> registered).
Keep in mind that from Xen's PoV PVH is just a HVM guest. Xen
currently keeps a bitmap of the emulated devices that are available to
a guest, but that's so far an internal field. We could consider
exporting this on a cpuid leaf, but then we need to make it a fixed
ABI.
Maybe we can make a list of platform devices that are not available on
PVH and that Linux assumes to be present?
Roger.
- Re: [Xen-devel] Xen PVH support in grub2, (continued)
- Re: [Xen-devel] Xen PVH support in grub2, Boris Ostrovsky, 2017/11/03
- Re: [Xen-devel] Xen PVH support in grub2, Juergen Gross, 2017/11/03
- Re: [Xen-devel] Xen PVH support in grub2, Boris Ostrovsky, 2017/11/03
- Re: [Xen-devel] Xen PVH support in grub2, Juergen Gross, 2017/11/06
- Re: [Xen-devel] Xen PVH support in grub2, Boris Ostrovsky, 2017/11/06
- Re: [Xen-devel] Xen PVH support in grub2, Juergen Gross, 2017/11/06
- Re: [Xen-devel] Xen PVH support in grub2, Boris Ostrovsky, 2017/11/06
- Re: [Xen-devel] Xen PVH support in grub2, Juergen Gross, 2017/11/07
- Re: [Xen-devel] Xen PVH support in grub2, Boris Ostrovsky, 2017/11/07
- Re: [Xen-devel] Xen PVH support in grub2, Konrad Rzeszutek Wilk, 2017/11/09
- Re: [Xen-devel] Xen PVH support in grub2,
Roger Pau Monné <=
- Re: [Xen-devel] Xen PVH support in grub2, Juergen Gross, 2017/11/03
Re: [Xen-devel] Xen PVH support in grub2, Juergen Gross, 2017/11/06