linux-kernel - Re: [PATCHv2 06/14] mm/page_alloc: Propagate encryption KeyID through page allocator

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Message-ID: <20180329123829.jnwmmdtt2py32d7j@node.shutemov.name>
Date:   Thu, 29 Mar 2018 15:38:29 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     "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>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv2 06/14] mm/page_alloc: Propagate encryption KeyID
 through page allocator

On Wed, Mar 28, 2018 at 10:15:02AM -0700, Dave Hansen wrote:
> On 03/28/2018 09:55 AM, Kirill A. Shutemov wrote:
> > @@ -51,7 +51,7 @@ static inline struct page *new_page_nodemask(struct page *page,
> >  	if (PageHighMem(page) || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
> >  		gfp_mask |= __GFP_HIGHMEM;
> >  
> > -	new_page = __alloc_pages_nodemask(gfp_mask, order,
> > +	new_page = __alloc_pages_nodemask(gfp_mask, order, page_keyid(page),
> >  				preferred_nid, nodemask);
> 
> You're not going to like this suggestion.
> 
> Am I looking at this too superficially, or does every single site into
> which you pass keyid also take a node and gfpmask and often an order?  I
> think you need to run this by the keepers of page_alloc.c and see if
> they'd rather do something more drastic.

Are you talking about having some kind of struct that would indicalte page
allocation context -- gfp_mask + order + node + keyid?

-- 
 Kirill A. Shutemov