linux-kernel - Re: [PATCH 0/3] xen: remove some checks for always present Xen features

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Date:   Mon, 10 May 2021 13:31:59 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Juergen Gross <jgross@...e.com>
Cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        x86@...nel.org, Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 0/3] xen: remove some checks for always present Xen
 features

On Mon, May 10, 2021 at 09:34:18AM +0200, Juergen Gross wrote:
> On 22.04.21 17:10, Juergen Gross wrote:
> > Some features of Xen can be assumed to be always present, so add a
> > central check to verify this being true and remove the other checks.
> > 
> > Juergen Gross (3):
> >    xen: check required Xen features
> >    xen: assume XENFEAT_mmu_pt_update_preserve_ad being set for pv guests
> >    xen: assume XENFEAT_gnttab_map_avail_bits being set for pv guests
> > 
> >   arch/x86/xen/enlighten_pv.c | 12 ++----------
> >   arch/x86/xen/mmu_pv.c       |  4 ++--
> >   drivers/xen/features.c      | 18 ++++++++++++++++++
> >   drivers/xen/gntdev.c        | 36 ++----------------------------------
> >   4 files changed, 24 insertions(+), 46 deletions(-)
> > 
> 
> Could I please get some feedback on this series?

I'm obviously in favour, but given I'm not an actual Xen user that might
not be worth much, still:

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>