[PATCH v3 5/5] drivers/node: Show in sysfs node's crypto capabilities

Martin Fernandez
2021-12-03T19:23:28Z

Show in each node in sysfs if its memory is able to do be encrypted by
the CPU, ie. if all its memory is marked with EFI_MEMORY_CPU_CRYPTO in
the EFI memory map.

Signed-off-by: Martin Fernandez <martin.fernandez@eclypsium.com>
---
drivers/base/node.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/drivers/base/node.c b/drivers/base/node.c
index b5a4ba18f9f9..67b0e2fa93b1 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -560,11 +560,21 @@ static ssize_t node_read_distance(struct device *dev,
}
static DEVICE_ATTR(distance, 0444, node_read_distance, NULL);

+static ssize_t crypto_capable_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct pglist_data *pgdat = NODE_DATA(dev->id);
+
+ return sysfs_emit(buf, "%d\n", pgdat->crypto_capable);
+}
+static DEVICE_ATTR_RO(crypto_capable);
+
static struct attribute *node_dev_attrs[] = {
&dev_attr_meminfo.attr,
&dev_attr_numastat.attr,
&dev_attr_distance.attr,
&dev_attr_vmstat.attr,
+ &dev_attr_crypto_capable.attr,
NULL
};

--
2.30.2