linux-kernel - Re: [PATCH v3 kvm/queue 06/16] KVM: Implement fd-based memory using MEMFD

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Message-ID: <20211224042554.GD44042@chaop.bj.intel.com>
Date:   Fri, 24 Dec 2021 12:25:54 +0800
From:   Chao Peng <chao.p.peng@...ux.intel.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, qemu-devel@...gnu.org,
        Jonathan Corbet <corbet@....net>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
        Hugh Dickins <hughd@...gle.com>,
        Jeff Layton <jlayton@...nel.org>,
        "J . Bruce Fields" <bfields@...ldses.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        luto@...nel.org, john.ji@...el.com, susie.li@...el.com,
        jun.nakajima@...el.com, dave.hansen@...el.com, ak@...ux.intel.com,
        david@...hat.com
Subject: Re: [PATCH v3 kvm/queue 06/16] KVM: Implement fd-based memory using
 MEMFD_OPS interfaces

On Fri, Dec 24, 2021 at 12:09:47AM +0100, Paolo Bonzini wrote:
> On 12/23/21 19:34, Sean Christopherson wrote:
> > >   	select HAVE_KVM_PM_NOTIFIER if PM
> > > +	select MEMFD_OPS
> > MEMFD_OPS is a weird Kconfig name given that it's not just memfd() that can
> > implement the ops.
> > 
> 
> Or, it's kvm that implements them to talk to memfd?

The only thing is VFIO may also use the same set of callbacks, as
discussed in the v2. But I think that's fine.

Chao
> 
> Paolo