From mboxrd@z Thu Jan  1 00:00:00 1970
From: Barret Rhoden <brho-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH 2/2] kvm: Use huge pages for DAX-backed files
Date: Tue, 13 Nov 2018 10:50:51 -0500
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Cc: x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, yu.c.zhang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Radim =?UTF-8?B?S3LEjW3DocWZ?= <rkrcmar-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>, Ross Zwisler <zwisler-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Paolo Bonzini <pbonzini-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>, Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>, yi.z.zhang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
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On 2018-11-13 at 10:36 David Hildenbrand <david-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> > Note that KVM already faulted in the page (or huge page) in the host's
> > page table, and we hold the KVM mmu spinlock (grabbed before checking
> > the mmu seq).  
> 
> I wonder if the KVM mmu spinlock is enough for walking (not KVM
> exclusive) host page tables. Can you elaborate?

I'll update the commit message with the info from Paolo's email (about
kvm_mmu_notifier_invalidate_range_end()).

Thanks,

Barret