coco/guest: Move shared guest CC infrastructure to drivers/virt/coco/guest/

In preparation for creating a new drivers/virt/coco/host/ directory to
house shared host driver infrastructure for confidential computing, move
configfs-tsm to a guest/ sub-directory. The tsm.ko module is renamed to
tsm_reports.ko. The old tsm.ko module was only ever demand loaded by
kernel internal dependencies, so it should not affect existing userspace
module install scripts.

The new drivers/virt/coco/guest/ is also a preparatory landing spot for
new / optional TSM Report mechanics like a TCB stability enumeration /
watchdog mechanism. To be added later.

Cc: Wu Hao <[email protected]>
Cc: Yilun Xu <[email protected]>
Cc: Samuel Ortiz <[email protected]>
Cc: Tom Lendacky <[email protected]>
Reviewed-by: Alexey Kardashevskiy <[email protected]>
Reviewed-by: Kuppuswamy Sathyanarayanan <[email protected]>
Link: https://patch.msgid.link/174107246641.1288555.208426916259466774.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <[email protected]>

Author: djbw

MAINTAINERS

@@ -24560,7 +24560,7 @@ M:	Dan Williams <[email protected]>
 L:	[email protected]
 S:	Maintained
 F:	Documentation/ABI/testing/configfs-tsm-report
-F:	drivers/virt/coco/tsm.c
+F:	drivers/virt/coco/guest/
 F:	include/linux/tsm.h
 
 TRUSTED SERVICES TEE DRIVER

drivers/virt/coco/Kconfig

@@ -3,10 +3,6 @@
 # Confidential computing related collateral
 #
 
-config TSM_REPORTS
-	select CONFIGFS_FS
-	tristate
-
 source "drivers/virt/coco/efi_secret/Kconfig"
 
 source "drivers/virt/coco/pkvm-guest/Kconfig"
@@ -16,3 +12,5 @@ source "drivers/virt/coco/sev-guest/Kconfig"
 source "drivers/virt/coco/tdx-guest/Kconfig"
 
 source "drivers/virt/coco/arm-cca-guest/Kconfig"
+
+source "drivers/virt/coco/guest/Kconfig"

drivers/virt/coco/Makefile

@@ -2,9 +2,9 @@
 #
 # Confidential computing related collateral
 #
-obj-$(CONFIG_TSM_REPORTS)	+= tsm.o
 obj-$(CONFIG_EFI_SECRET)	+= efi_secret/
 obj-$(CONFIG_ARM_PKVM_GUEST)	+= pkvm-guest/
 obj-$(CONFIG_SEV_GUEST)		+= sev-guest/
 obj-$(CONFIG_INTEL_TDX_GUEST)	+= tdx-guest/
 obj-$(CONFIG_ARM_CCA_GUEST)	+= arm-cca-guest/
+obj-$(CONFIG_TSM_REPORTS)	+= guest/

drivers/virt/coco/guest/Kconfig

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Confidential computing shared guest collateral
+#
+config TSM_REPORTS
+	select CONFIGFS_FS
+	tristate

drivers/virt/coco/guest/Makefile

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_TSM_REPORTS)	+= tsm_report.o
+tsm_report-y := report.o