linux-kernel - Re: [PATCH v2 0/3] xen: remove some checks for always present Xen features

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Date:   Fri, 30 Jul 2021 09:10:25 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     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 v2 0/3] xen: remove some checks for always present Xen
 features


On 7/30/21 3:18 AM, 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(-)



Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>