linux-kernel - [PATCH v4 1/5] mm/memblock: Tag memblocks with crypto capabilities

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Message-Id: <20211216192222.127908-2-martin.fernandez@eclypsium.com>
Date:   Thu, 16 Dec 2021 16:22:18 -0300
From:   Martin Fernandez <martin.fernandez@...ypsium.com>
To:     linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, linux-mm@...ck.org
Cc:     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, rppt@...nel.org,
        akpm@...ux-foundation.org, daniel.gutson@...ypsium.com,
        hughsient@...il.com, alex.bazhaniuk@...ypsium.com,
        alison.schofield@...el.com,
        Martin Fernandez <martin.fernandez@...ypsium.com>
Subject: [PATCH v4 1/5] mm/memblock: Tag memblocks with crypto capabilities

Add the capability to mark regions of the memory memory_type able of
hardware memory encryption.

Also add the capability to query if all regions of a memory node are
able to do hardware memory encryption to call it when initializing the
nodes.

Signed-off-by: Martin Fernandez <martin.fernandez@...ypsium.com>
---
 include/linux/memblock.h |  5 ++++
 mm/memblock.c            | 49 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 8adcf1fa8096..ec808ad93693 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -41,6 +41,7 @@ extern unsigned long long max_possible_pfn;
  * via a driver, and never indicated in the firmware-provided memory map as
  * system RAM. This corresponds to IORESOURCE_SYSRAM_DRIVER_MANAGED in the
  * kernel resource tree.
+ * @MEMBLOCK_CRYPTO_CAPABLE: capable of hardware encryption
  */
 enum memblock_flags {
 	MEMBLOCK_NONE		= 0x0,	/* No special request */
@@ -48,6 +49,7 @@ enum memblock_flags {
 	MEMBLOCK_MIRROR		= 0x2,	/* mirrored region */
 	MEMBLOCK_NOMAP		= 0x4,	/* don't add to kernel direct mapping */
 	MEMBLOCK_DRIVER_MANAGED = 0x8,	/* always detected via a driver */
+	MEMBLOCK_CRYPTO_CAPABLE = 0x10,  /* capable of hardware encryption */
 };
 
 /**
@@ -121,6 +123,9 @@ int memblock_physmem_add(phys_addr_t base, phys_addr_t size);
 void memblock_trim_memory(phys_addr_t align);
 bool memblock_overlaps_region(struct memblock_type *type,
 			      phys_addr_t base, phys_addr_t size);
+bool memblock_node_is_crypto_capable(int nid);
+int memblock_mark_crypto_capable(phys_addr_t base, phys_addr_t size);
+int memblock_clear_crypto_capable(phys_addr_t base, phys_addr_t size);
 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size);
 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size);
diff --git a/mm/memblock.c b/mm/memblock.c
index 1018e50566f3..61ec50647469 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -191,6 +191,27 @@ bool __init_memblock memblock_overlaps_region(struct memblock_type *type,
 	return i < type->cnt;
 }
 
+/**
+ * memblock_node_is_crypto_capable - get if whole node is capable
+ * of encryption
+ * @nid: number of node
+ *
+ * Iterate over all memory memblock_type and find if all regions under
+ * node @nid are capable of hardware encryption.
+ */
+bool __init_memblock memblock_node_is_crypto_capable(int nid)
+{
+	struct memblock_region *region;
+
+	for_each_mem_region(region) {
+		if ((memblock_get_region_node(region) == nid) &&
+		    !(region->flags & MEMBLOCK_CRYPTO_CAPABLE))
+			return false;
+	}
+
+	return true;
+}
+
 /**
  * __memblock_find_range_bottom_up - find free area utility in bottom-up
  * @start: start of candidate range
@@ -885,6 +906,34 @@ static int __init_memblock memblock_setclr_flag(phys_addr_t base,
 	return 0;
 }
 
+/**
+ * memblock_mark_crypto_capable - Mark memory regions capable of hardware
+ * encryption with flag MEMBLOCK_CRYPTO_CAPABLE.
+ * @base: the base phys addr of the region
+ * @size: the size of the region
+ *
+ * Return: 0 on success, -errno on failure.
+ */
+int __init_memblock memblock_mark_crypto_capable(phys_addr_t base,
+						 phys_addr_t size)
+{
+	return memblock_setclr_flag(base, size, 1, MEMBLOCK_CRYPTO_CAPABLE);
+}
+
+/**
+ * memblock_clear_crypto_capable - Clear flag MEMBLOCK_CRYPTO for a
+ * specified region.
+ * @base: the base phys addr of the region
+ * @size: the size of the region
+ *
+ * Return: 0 on success, -errno on failure.
+ */
+int __init_memblock memblock_clear_crypto_capable(phys_addr_t base,
+						  phys_addr_t size)
+{
+	return memblock_setclr_flag(base, size, 0, MEMBLOCK_CRYPTO_CAPABLE);
+}
+
 /**
  * memblock_mark_hotplug - Mark hotpluggable memory with flag MEMBLOCK_HOTPLUG.
  * @base: the base phys addr of the region
-- 
2.30.2