linux-kernel - Re: [RFC 07/16] KVM: mm: Introduce VM_KVM

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Date:   Wed, 27 May 2020 01:04:23 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        David Rientjes <rientjes@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Will Drewry <wad@...omium.org>,
        "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
        "Kleen, Andi" <andi.kleen@...el.com>, x86@...nel.org,
        kvm@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [RFC 07/16] KVM: mm: Introduce VM_KVM_PROTECTED

On Mon, May 25, 2020 at 11:40:01PM -0700, John Hubbard wrote:
> On 2020-05-22 05:52, Kirill A. Shutemov wrote:
> ...
> > @@ -2773,6 +2780,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
> >   #define FOLL_LONGTERM	0x10000	/* mapping lifetime is indefinite: see below */
> >   #define FOLL_SPLIT_PMD	0x20000	/* split huge pmd before returning */
> >   #define FOLL_PIN	0x40000	/* pages must be released via unpin_user_page */
> > +#define FOLL_KVM	0x80000 /* access to VM_KVM_PROTECTED VMAs */
> 
> I grabbed 0x80000 already, for FOLL_FAST_ONLY. :)

Let's see who getting upstream first :P (Spoiler: you)

-- 
 Kirill A. Shutemov