linux-kernel - Re: [PATCH v7 2/8] mm/mmzone: Tag pg_data

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Date:   Tue, 26 Apr 2022 09:16:48 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Martin Fernandez <martin.fernandez@...ypsium.com>
Cc:     linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, linux-mm@...ck.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        ardb@...nel.org, dvhart@...radead.org, andy@...radead.org,
        gregkh@...uxfoundation.org, rafael@...nel.org,
        akpm@...ux-foundation.org, daniel.gutson@...ypsium.com,
        hughsient@...il.com, alex.bazhaniuk@...ypsium.com,
        alison.schofield@...el.com, keescook@...omium.org
Subject: Re: [PATCH v7 2/8] mm/mmzone: Tag pg_data_t with crypto capabilities

On Mon, Apr 25, 2022 at 02:15:20PM -0300, Martin Fernandez wrote:
> Add a new member in the pg_data_t struct to tell whether the node
> corresponding to that pg_data_t is able to do hardware memory
> encryption.
> 
> This will be read from sysfs.
> 
> Signed-off-by: Martin Fernandez <martin.fernandez@...ypsium.com>

Reviewed-by: Mike Rapoport <rppt@...ux.ibm.com>

> ---
>  include/linux/mmzone.h | 3 +++
>  mm/page_alloc.c        | 1 +
>  2 files changed, 4 insertions(+)
> 
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index 46ffab808f03..89054af9e599 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -886,6 +886,9 @@ typedef struct pglist_data {
>  	struct task_struct *kcompactd;
>  	bool proactive_compact_trigger;
>  #endif
> +
> +	bool crypto_capable;
> +
>  	/*
>  	 * This is a per-node reserve of pages that are not available
>  	 * to userspace allocations.
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 0e42038382c1..a244151045b4 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -7699,6 +7699,7 @@ static void __init free_area_init_node(int nid)
>  	pgdat->node_id = nid;
>  	pgdat->node_start_pfn = start_pfn;
>  	pgdat->per_cpu_nodestats = NULL;
> +	pgdat->crypto_capable = memblock_node_is_crypto_capable(nid);
>  
>  	if (start_pfn != end_pfn) {
>  		pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid,
> -- 
> 2.30.2
> 
> 

-- 
Sincerely yours,
Mike.