linux-kernel - Re: [PATCH 1/2] xen: Remove Xen PVH/PVHVM dependency on PCI

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Message-ID: <20201015150844.GF68032@Air-de-Roger>
Date:   Thu, 15 Oct 2020 17:08:44 +0200
From:   Roger Pau Monné <roger.pau@...rix.com>
To:     Jan Beulich <jbeulich@...e.com>
CC:     Jason Andryuk <jandryuk@...il.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        "Stefano Stabellini" <sstabellini@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        xen-devel <xen-devel@...ts.xenproject.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] xen: Remove Xen PVH/PVHVM dependency on PCI

On Thu, Oct 15, 2020 at 05:02:21PM +0200, Jan Beulich wrote:
> On 15.10.2020 16:59, Jason Andryuk wrote:
> > On Thu, Oct 15, 2020 at 4:10 AM Jan Beulich <jbeulich@...e.com> wrote:
> >>
> >> On 14.10.2020 19:53, Jason Andryuk wrote:
> >>> @@ -76,7 +80,9 @@ config XEN_DEBUG_FS
> >>>         Enabling this option may incur a significant performance overhead.
> >>>
> >>>  config XEN_PVH
> >>> -     bool "Support for running as a Xen PVH guest"
> >>> +     bool "Xen PVH guest support"
> >>
> >> Tangential question: Is "guest" here still appropriate, i.e.
> >> isn't this option also controlling whether the kernel can be
> >> used in a PVH Dom0?
> > 
> > Would you like something more generic like "Xen PVH support" and
> > "Support for running in Xen PVH mode"?
> 
> Yeah, just dropping "guest" would be fine with me. No idea how
> to reflect that PVH Dom0 isn't supported, yet.

The fact that it isn't supported by Xen shouldn't be reflected on the
Linux configuration, as it's independent. Ie: you could run this Linux
kernel on a future version of Xen where PVH dom0 is supported.

There's already a warning printed by Xen when booting PVH dom0 about
not being a supported mode.

Thanks, Roger.