[PATCHv2,36/59] keys/mktme: Require ACPI HMAT to register the MKTME Key Service
diff mbox series

Message ID 20190731150813.26289-37-kirill.shutemov@linux.intel.com
State New
Headers show
Series
  • Intel MKTME enabling
Related show

Commit Message

Kirill A. Shutemov July 31, 2019, 3:07 p.m. UTC
From: Alison Schofield <alison.schofield@intel.com>

The ACPI HMAT will be used by the MKTME key service to identify
topologies that support the safe programming of encryption keys.
Those decisions will happen at key creation time and during
hotplug events.

To enable this, we at least need to have the ACPI HMAT present
at init time. If it's not present, do not register the type.

If the HMAT is not present, failure looks like this:
[ ] MKTME: Registration failed. ACPI HMAT not present.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 security/keys/mktme_keys.c | 7 +++++++
 1 file changed, 7 insertions(+)

Patch
diff mbox series

diff --git a/security/keys/mktme_keys.c b/security/keys/mktme_keys.c
index 2d90cc83e5ce..6265b62801e9 100644
--- a/security/keys/mktme_keys.c
+++ b/security/keys/mktme_keys.c
@@ -2,6 +2,7 @@ 
 
 /* Documentation/x86/mktme/ */
 
+#include <linux/acpi.h>
 #include <linux/cred.h>
 #include <linux/cpu.h>
 #include <linux/init.h>
@@ -445,6 +446,12 @@  static int __init init_mktme(void)
 
 	mktme_available_keyids = mktme_nr_keyids();
 
+	/* Require an ACPI HMAT to identify MKTME safe topologies */
+	if (!acpi_hmat_present()) {
+		pr_warn("MKTME: Registration failed. ACPI HMAT not present.\n");
+		return -EINVAL;
+	}
+
 	/* Mapping of Userspace Keys to Hardware KeyIDs */
 	mktme_map = kvzalloc((sizeof(*mktme_map) * (mktme_nr_keyids() + 1)),
 			     GFP_KERNEL);