linux-kernel - Re: [PATCHv5 05/19] mm/page_alloc: Handle allocation for encrypted memory

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Message-ID: <20180720122516.zm35yk4r4tcy752s@kshutemo-mobl1>
Date:   Fri, 20 Jul 2018 15:25:16 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Michal Hocko <mhocko@...e.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Kai Huang <kai.huang@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv5 05/19] mm/page_alloc: Handle allocation for encrypted
 memory

On Thu, Jul 19, 2018 at 07:05:36AM -0700, Dave Hansen wrote:
> On 07/19/2018 01:27 AM, Kirill A. Shutemov wrote:
> >> What other code might need prep_encrypted_page()?
> > 
> > Custom pages allocators if these pages can end up in encrypted VMAs.
> > 
> > It this case compaction creates own pool of pages to be used for
> > allocation during page migration.
> 
> OK, that makes sense.  It also sounds like some great information to add
> near prep_encrypted_page().

Okay.

> Do we have any ability to catch cases like this if we get them wrong, or
> will we just silently corrupt data?

I cannot come up with any reasonable way to detect this immediately.
I'll think about this more.

-- 
 Kirill A. Shutemov