linux-kernel - Re: [PATCH 00/14] KVM: x86/mmu: Huge page fixes, cleanup, and DAX

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Message-ID: <d7d0801b-79be-a5e7-a376-abd92b5c09b2@redhat.com>
Date:   Tue, 21 Jan 2020 16:10:30 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Barret Rhoden <brho@...gle.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Paul Mackerras <paulus@...abs.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        kvm-ppc@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        syzbot+c9d1fb51ac9d0d10c39d@...kaller.appspotmail.com,
        Andrea Arcangeli <aarcange@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        David Hildenbrand <david@...hat.com>,
        Jason Zeng <jason.zeng@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Liran Alon <liran.alon@...cle.com>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>
Subject: Re: [PATCH 00/14] KVM: x86/mmu: Huge page fixes, cleanup, and DAX

On 09/01/20 20:47, Barret Rhoden wrote:
> Hi -
> 
> On 1/8/20 3:24 PM, Sean Christopherson wrote:
>> This series is a mix of bug fixes, cleanup and new support in KVM's
>> handling of huge pages.  The series initially stemmed from a syzkaller
>> bug report[1], which is fixed by patch 02, "mm: thp: KVM: Explicitly
>> check for THP when populating secondary MMU".
>>
>> While investigating options for fixing the syzkaller bug, I realized KVM
>> could reuse the approach from Barret's series to enable huge pages for
>> DAX
>> mappings in KVM[2] for all types of huge mappings, i.e. walk the host
>> page
>> tables instead of querying metadata (patches 05 - 09).
> 
> Thanks, Sean.  I tested this patch series out, and it works for me.
> (Huge KVM mappings of a DAX file, etc.).

Queued, thanks.

Paolo