linux-kernel - Re: [PATCH V1 3/6] xen/virtio: Add option to restrict memory access under Xen

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Date:   Tue, 26 Apr 2022 13:16:58 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Juergen Gross <jgross@...e.com>
Cc:     Oleksandr <olekstysh@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        xen-devel@...ts.xenproject.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Julien Grall <julien@....org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [PATCH V1 3/6] xen/virtio: Add option to restrict memory access
 under Xen

On Tue, Apr 26, 2022 at 11:36:40AM +0200, Juergen Gross wrote:
> As the suggestion was to add another flag this wouldn't be a problem IMO.

We had a problem already with adding one flag would break the same flag
on the other guest type. That's why we added cc_vendor too. So it can be
tricky.

> platform_has() doesn't seem too bad IMO.
> 
> I will write a patch for starting the discussion.

Yeah, I guess such a proposal would need a wider audience - maybe CC
linux-arch...

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette