linux-kernel - Re: [PATCH v5 1/2] mm: make dev_pagemap_mapping

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Date:   Wed, 15 Jan 2020 19:33:49 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Barret Rhoden <brho@...gle.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        David Hildenbrand <david@...hat.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        linux-nvdimm@...ts.01.org, x86@...nel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, jason.zeng@...el.com
Subject: Re: [PATCH v5 1/2] mm: make dev_pagemap_mapping_shift() externally
 visible

On 16/12/19 18:59, Barret Rhoden wrote:
> Does KVM-x86 need its own names for the levels?  If not, I could convert
> the PT_PAGE_TABLE_* stuff to PG_LEVEL_* stuff.

Yes, please do.  For the 2M/4M case, it's only incorrect to use 2M here:

        if (PTTYPE == 32 && walker->level == PT_DIRECTORY_LEVEL && is_cpuid_PSE36())
                gfn += pse36_gfn_delta(pte);

And for that you can even use "> PG_LEVEL_4K" if you think it's nicer.

Paolo