On Mon, Jul 04, 2022 at 10:58:26AM -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@xxxxxxxxxxxxx>
> ---
> 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 aab70355d64f..6fd4785f1d05 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -883,6 +883,9 @@ typedef struct pglist_data {
> struct task_struct *kcompactd;
> bool proactive_compact_trigger;
> #endif
> +
> + bool crypto_capable;
> +
There's already pgdat->flags. Any reason we cannot encode it there?
> /*
> * 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 e008a3df0485..147437329ac7 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -7729,6 +7729,7 @@ 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
>
--
Kiryl Shutsemau / Kirill A. Shutemov
