linux-kernel - Re: [PATCH] mm: Speed up mremap on large regions

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Message-ID: <927d98c0-ec81-ce7a-994d-6405abce18db@redhat.com>
Date:   Fri, 12 Oct 2018 09:24:32 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Jann Horn <jannh@...gle.com>, joel@...lfernandes.org
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>, kernel-team@...roid.com,
        Minchan Kim <minchan@...gle.com>,
        Hugh Dickins <hughd@...gle.com>, lokeshgidra@...gle.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        pombredanne@...b.com, Thomas Gleixner <tglx@...utronix.de>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        kvm@...r.kernel.org
Subject: Re: [PATCH] mm: Speed up mremap on large regions

On 12/10/2018 05:21, Jann Horn wrote:
> I don't know how this interacts with shadow paging implementations.

Shadow paging simply uses MMU notifiers and that does not assume that
PTE invalidation is atomic.  The invalidate_range_start and
invalidate_range_end calls are not affected by Joel's patch, so it's ok
for KVM and also for other users of MMU notifiers.

Paolo