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

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Date:   Wed, 28 Mar 2018 10:15:02 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     "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>
Cc:     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 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.