linux-kernel - Re: [PATCH v4 2/2] kvm: Use huge pages for DAX-backed files

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Date:   Thu, 12 Dec 2019 12:03:38 -0500
From:   Barret Rhoden <brho@...gle.com>
To:     Liran Alon <liran.alon@...cle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        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 v4 2/2] kvm: Use huge pages for DAX-backed files

On 12/12/19 7:33 AM, Liran Alon wrote:
>> +	/*
>> +	 * Our caller grabbed the KVM mmu_lock with a successful
>> +	 * mmu_notifier_retry, so we're safe to walk the page table.
>> +	 */
>> +	switch (dev_pagemap_mapping_shift(hva, current->mm)) {
> Doesn’t dev_pagemap_mapping_shift() get “struct page” as first parameter?
> Was this changed by a commit I missed?

I changed this in Patch 1.  The place I call it in KVM has the address 
and mm available, which is the only think dev_pagemap_mapping_shift() 
really needs.  (The first thing it did was convert page to address).

I'll add some more text to patch 1's commit message about that.

Thanks,

Barret