linux-kernel - [PATCH v3 04/16] platform/x86/intel/ifs: Remove memory allocation from load path

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Date:   Wed, 16 Nov 2022 19:59:23 -0800
From:   Jithu Joseph <jithu.joseph@...el.com>
To:     hdegoede@...hat.com, markgross@...nel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        gregkh@...uxfoundation.org, jithu.joseph@...el.com,
        ashok.raj@...el.com, tony.luck@...el.com,
        linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        patches@...ts.linux.dev, ravi.v.shankar@...el.com,
        thiago.macieira@...el.com, athenas.jimenez.gonzalez@...el.com,
        sohil.mehta@...el.com
Subject: [PATCH v3 04/16] platform/x86/intel/ifs: Remove memory allocation from load path

IFS requires tests to be authenticated once for each CPU socket
on a system.

scan_chunks_sanity_check() was dynamically allocating memory
to store the state of whether tests have been authenticated on
each socket for every load operation.

Move the memory allocation to init path.

Reviewed-by: Tony Luck <tony.luck@...el.com>
Suggested-by: Borislav Petkov <bp@...en8.de>
Signed-off-by: Jithu Joseph <jithu.joseph@...el.com>
---
 drivers/platform/x86/intel/ifs/ifs.h  |  2 ++
 drivers/platform/x86/intel/ifs/core.c | 13 +++++++++++--
 drivers/platform/x86/intel/ifs/load.c | 14 ++++----------
 3 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/drivers/platform/x86/intel/ifs/ifs.h b/drivers/platform/x86/intel/ifs/ifs.h
index 3ff1d9aaeaa9..3a051890d9e7 100644
--- a/drivers/platform/x86/intel/ifs/ifs.h
+++ b/drivers/platform/x86/intel/ifs/ifs.h
@@ -229,4 +229,6 @@ void ifs_load_firmware(struct device *dev);
 int do_core_test(int cpu, struct device *dev);
 const struct attribute_group **ifs_get_groups(void);
 
+extern bool *ifs_pkg_auth;
+
 #endif
diff --git a/drivers/platform/x86/intel/ifs/core.c b/drivers/platform/x86/intel/ifs/core.c
index 5fb7f655c291..4b39f2359180 100644
--- a/drivers/platform/x86/intel/ifs/core.c
+++ b/drivers/platform/x86/intel/ifs/core.c
@@ -4,6 +4,7 @@
 #include <linux/module.h>
 #include <linux/kdev_t.h>
 #include <linux/semaphore.h>
+#include <linux/slab.h>
 
 #include <asm/cpu_device_id.h>
 
@@ -30,6 +31,8 @@ static struct ifs_device ifs_device = {
 	},
 };
 
+bool *ifs_pkg_auth;
+
 static int __init ifs_init(void)
 {
 	const struct x86_cpu_id *m;
@@ -51,8 +54,13 @@ static int __init ifs_init(void)
 	ifs_device.misc.groups = ifs_get_groups();
 
 	if ((msrval & BIT(ifs_device.data.integrity_cap_bit)) &&
-	    !misc_register(&ifs_device.misc))
-		return 0;
+	    !misc_register(&ifs_device.misc)) {
+		ifs_pkg_auth = kmalloc_array(topology_max_packages(), sizeof(bool), GFP_KERNEL);
+		if (!ifs_pkg_auth)
+			return -ENOMEM;
+		else
+			return 0;
+	}
 
 	return -ENODEV;
 }
@@ -60,6 +68,7 @@ static int __init ifs_init(void)
 static void __exit ifs_exit(void)
 {
 	misc_deregister(&ifs_device.misc);
+	kfree(ifs_pkg_auth);
 }
 
 module_init(ifs_init);
diff --git a/drivers/platform/x86/intel/ifs/load.c b/drivers/platform/x86/intel/ifs/load.c
index 89ce265887ea..c914e4d359db 100644
--- a/drivers/platform/x86/intel/ifs/load.c
+++ b/drivers/platform/x86/intel/ifs/load.c
@@ -3,7 +3,6 @@
 
 #include <linux/firmware.h>
 #include <asm/cpu.h>
-#include <linux/slab.h>
 #include <asm/microcode_intel.h>
 
 #include "ifs.h"
@@ -118,16 +117,12 @@ static void copy_hashes_authenticate_chunks(struct work_struct *work)
  */
 static int scan_chunks_sanity_check(struct device *dev)
 {
-	int metadata_size, curr_pkg, cpu, ret = -ENOMEM;
+	int metadata_size, curr_pkg, cpu, ret;
 	struct ifs_data *ifsd = ifs_get_data(dev);
-	bool *package_authenticated;
 	struct ifs_work local_work;
 	char *test_ptr;
 
-	package_authenticated = kcalloc(topology_max_packages(), sizeof(bool), GFP_KERNEL);
-	if (!package_authenticated)
-		return ret;
-
+	memset(ifs_pkg_auth, 0, (topology_max_packages() * sizeof(bool)));
 	metadata_size = ifs_header_ptr->metadata_size;
 
 	/* Spec says that if the Meta Data Size = 0 then it should be treated as 2000 */
@@ -150,7 +145,7 @@ static int scan_chunks_sanity_check(struct device *dev)
 	cpus_read_lock();
 	for_each_online_cpu(cpu) {
 		curr_pkg = topology_physical_package_id(cpu);
-		if (package_authenticated[curr_pkg])
+		if (ifs_pkg_auth[curr_pkg])
 			continue;
 		reinit_completion(&ifs_done);
 		local_work.dev = dev;
@@ -161,12 +156,11 @@ static int scan_chunks_sanity_check(struct device *dev)
 			ret = -EIO;
 			goto out;
 		}
-		package_authenticated[curr_pkg] = 1;
+		ifs_pkg_auth[curr_pkg] = 1;
 	}
 	ret = 0;
 out:
 	cpus_read_unlock();
-	kfree(package_authenticated);
 
 	return ret;
 }
-- 
2.25.1