linux-kernel - Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest

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Date:	Wed, 27 Jan 2016 11:00:36 -0800
From:	"Luis R. Rodriguez" <mcgrof@...nel.org>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Takashi Iwai <tiwai@...e.de>, Avi Kivity <avi@...hat.com>,
	Joerg Roedel <jroedel@...e.de>,
	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Andy Lutomirski <luto@...capital.net>,
	Andrew Cooper <andrew.cooper3@...rix.com>
Cc:	David Vrabel <david.vrabel@...rix.com>,
	Juergen Gross <jgross@...e.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Rusty Russell <rusty@...tcorp.com.au>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	xen-devel@...ts.xenproject.org,
	Roger Pau Monné <roger.pau@...rix.com>,
	"Luis R. Rodriguez" <mcgrof@...nel.org>
Subject: Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest

On Wed, Jan 27, 2016 at 10:48 AM, Luis R. Rodriguez <mcgrof@...nel.org> wrote:
>
> Worth mentioning here also is hpa's clarification on when subarch type
> PC (0) should be used: [it should be used if the hardware is]
> "enumerable using standard PC mechanisms (PCI, ACPI) and doesn't need
> a special boot flow" -- does that fit HVMLite's description so far? If
> so then The Xen subarch may need to be redefined as well to be clear
> what it means. I don't think we need to be precise but at the very
> least cover grounds to enable the definitions to meet its actual use
> to not confuse users.

Another thing to consider for HVMlite is that if the 0 subarch (PC) is
used in light of my linker table work and x86's use of it with the
subarch and supported subarch bitmask, is that it would also mean
HVMLite would run all routines currently pegged as needing PC type
(the current KVM and bare metal path) and it would mean not running
anything only pegged with Xen subarch type (but note that today Xen
doesn't even set the subarch type). If there is nothing in common
between PV and HVMlite (no x86 init calls to share), and if HVMLite
*can* call *alllllllll* PC init calls, then by all means this is fine,
and if we just need to distinguish stuff between PC types that's fine,
it may still be possible to further extend hypervisor_type to the x86
init calls I'm adding as another supported_hyper_types to ensure even
though a subarch is being used, that we also check the supported
hypervisor type as well.

 Luis