linux-kernel - Re: [PATCH 0/2] Remove 32-bit Xen PV guest support

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Message-ID: <20190715123207.GE3419@hirez.programming.kicks-ass.net>
Date:   Mon, 15 Jul 2019 14:32:07 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Juergen Gross <jgross@...e.com>
Cc:     xen-devel@...ts.xenproject.org, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Alok Kataria <akataria@...are.com>
Subject: Re: [PATCH 0/2] Remove 32-bit Xen PV guest support

On Mon, Jul 15, 2019 at 01:37:37PM +0200, Juergen Gross wrote:
> The long term plan has been to replace Xen PV guests by PVH. The first
> victim of that plan are now 32-bit PV guests, as those are used only
> rather seldom these days. Xen on x86 requires 64-bit support and with
> Grub2 now supporting PVH officially since version 2.04 there is no
> need to keep 32-bit PV guest support alive in the Linux kernel.
> Additionally Meltdown mitigation is not available in the kernel running
> as 32-bit PV guest, so dropping this mode makes sense from security
> point of view, too.
> 
> Juergen Gross (2):
>   x86/xen: remove 32-bit Xen PV guest support
>   x86/paravirt: remove 32-bit support from PARAVIRT_XXL

Hooray!