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From:   Martin Fernandez <martin.fernandez@eclypsium.com>
To:     linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org,
        platform-driver-x86@vger.kernel.org, linux-mm@kvack.org
Cc:     tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
        dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com,
        ardb@kernel.org, dvhart@infradead.org, andy@infradead.org,
        gregkh@linuxfoundation.org, rafael@kernel.org, rppt@kernel.org,
        akpm@linux-foundation.org, daniel.gutson@eclypsium.com,
        hughsient@gmail.com, alex.bazhaniuk@eclypsium.com,
        alison.schofield@intel.com, keescook@chromium.org,
        Martin Fernandez <martin.fernandez@eclypsium.com>
Subject: [PATCH v6 2/6] mm/mmzone: Tag pg_data_t with crypto capabilities
Date:   Thu,  3 Feb 2022 13:43:24 -0300
Message-Id: <20220203164328.203629-3-martin.fernandez@eclypsium.com>
In-Reply-To: <20220203164328.203629-1-martin.fernandez@eclypsium.com>
References: <20220203164328.203629-1-martin.fernandez@eclypsium.com>
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Add a new member in the pg_data_t struct 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@eclypsium.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 936dc0b6c226..cec51e7a01d9 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -871,6 +871,9 @@ 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 c5952749ad40..8bcbd6fa0089 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7592,6 +7592,7 @@ 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);
 
 	pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid,
 		(u64)start_pfn << PAGE_SHIFT,
-- 
2.30.2