From da1f607ed6e6a904463396bb6a28bf96584c61cc Mon Sep 17 00:00:00 2001
From: Mario Limonciello <mario.limonciello@dell.com>
Date: Wed, 1 Nov 2017 14:25:33 -0500
Subject: [PATCH] platform/x86: dell-smbios-smm: test for WSMT
Git-commit: da1f607ed6e6a904463396bb6a28bf96584c61cc
Patch-mainline: v4.15-rc1
References: FATE#325842

WSMT is as an attestation to the OS that the platform won't
modify memory outside of pre-defined areas.

If a platform has WSMT enabled in BIOS setup, SMM calls through
dcdbas will fail.  The only way to access platform data in these
instances is through the WMI SMBIOS calling interface.

Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
Reviewed-by: Edward O'Callaghan <quasisec@google.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/platform/x86/dell-smbios-smm.c |   33 +++++++++++++++++++++++++++++++++
 drivers/platform/x86/dell-smbios.h     |    2 ++
 2 files changed, 35 insertions(+)

--- a/drivers/platform/x86/dell-smbios-smm.c
+++ b/drivers/platform/x86/dell-smbios-smm.c
@@ -102,6 +102,32 @@ int dell_smbios_smm_call(struct calling_
 	return 0;
 }
 
+/* When enabled this indicates that SMM won't work */
+static bool test_wsmt_enabled(void)
+{
+	struct calling_interface_token *wsmt;
+
+	/* if token doesn't exist, SMM will work */
+	wsmt = dell_smbios_find_token(WSMT_EN_TOKEN);
+	if (!wsmt)
+		return false;
+
+	/* If token exists, try to access over SMM but set a dummy return.
+	 * - If WSMT disabled it will be overwritten by SMM
+	 * - If WSMT enabled then dummy value will remain
+	 */
+	buffer->cmd_class = CLASS_TOKEN_READ;
+	buffer->cmd_select = SELECT_TOKEN_STD;
+	memset(buffer, 0, sizeof(struct calling_interface_buffer));
+	buffer->input[0] = wsmt->location;
+	buffer->output[0] = 99;
+	dell_smbios_smm_call(buffer);
+	if (buffer->output[0] == 99)
+		return true;
+
+	return false;
+}
+
 static int __init dell_smbios_smm_init(void)
 {
 	int ret;
@@ -115,6 +141,12 @@ static int __init dell_smbios_smm_init(v
 
 	dmi_walk(find_cmd_address, NULL);
 
+	if (test_wsmt_enabled()) {
+		pr_debug("Disabling due to WSMT enabled\n");
+		ret = -ENODEV;
+		goto fail_wsmt;
+	}
+
 	platform_device = platform_device_alloc("dell-smbios", 1);
 	if (!platform_device) {
 		ret = -ENOMEM;
@@ -138,6 +170,7 @@ fail_register:
 fail_platform_device_add:
 	platform_device_put(platform_device);
 
+fail_wsmt:
 fail_platform_device_alloc:
 	free_page((unsigned long)buffer);
 	return ret;
--- a/drivers/platform/x86/dell-smbios.h
+++ b/drivers/platform/x86/dell-smbios.h
@@ -44,6 +44,8 @@
 #define KBD_LED_AUTO_100_TOKEN	0x02F6
 #define GLOBAL_MIC_MUTE_ENABLE	0x0364
 #define GLOBAL_MIC_MUTE_DISABLE	0x0365
+#define WSMT_EN_TOKEN		0x04EC
+#define WSMT_DIS_TOKEN		0x04ED
 
 struct notifier_block;