drivers/misc: vm_gen_counter: initial driver implementation

PATCH Superseded Or Idgar 1 participant 1 message Feb 27, 2018 Char and misc drivers

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Or Idgar

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2018-02-27 10:36 UTC #0 lore raw

PATCH v4 1/1 drivers/misc: vm_gen_counter: initial driver implementation

From: Or Idgar <[email protected]>

This patch is a driver which expose the Virtual Machine Generation ID via sysfs. The ID is a UUID value used to differentiate between virtual machines.

The VM-Generation ID is a feature defined by Microsoft (paper:
http://go.microsoft.com/fwlink/?LinkId=260709) and supported by multiple hypervisor vendors.

Signed-off-by Or Idgar <[email protected]>

---

Changes in v4:
- variable phy_addr changed to phys_addr (nit)
- using iomem functions to support arch portability

 Documentation/ABI/testing/sysfs-hypervisor |  13 +++
 drivers/misc/Kconfig                       |   6 ++
 drivers/misc/Makefile                      |   1 +
 drivers/misc/vmgenid.c                     | 142 +++++++++++++++++++++++++++++
 4 files changed, 162 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-hypervisor
 create mode 100644 drivers/misc/vmgenid.c

Documentation/ABI/testing/sysfs-hypervisor new file +13 -0

new file mode 100644
index 000000000000..2f9a7b8eab70
@@ -0,0 +1,13 @@
+What:		/sys/hypervisor/vm_gen_counter
+Date:		February 2018
+Contact:	Or Idgar <[email protected]>
+		Gal Hammer <[email protected]>
+Description:	Expose the virtual machine generation ID. The directory
+		contains two files: "generation_id" and "raw". Both files
+		represent the same information.
+
+		"generation_id" file is a UUID string
+		representation.
+
+		"raw" file is a 128-bit integer
+		representation (binary).

drivers/misc/Kconfig +6 -0

index 03605f8fc0dc..5a74802bdfb4 100644
@@ -500,6 +500,12 @@ config MISC_RTSX
 	tristate
 	default MISC_RTSX_PCI || MISC_RTSX_USB
 
+config VMGENID
+	tristate "Virtual Machine Generation ID driver"
+	help
+	  This is a Virtual Machine Generation ID driver which provides
+	  a virtual machine unique identifier.
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"

drivers/misc/Makefile +1 -0

index c3c8624f4d95..067aa666bb6a 100644
@@ -57,6 +57,7 @@ obj-$(CONFIG_ASPEED_LPC_SNOOP)	+= aspeed-lpc-snoop.o
 obj-$(CONFIG_PCI_ENDPOINT_TEST)	+= pci_endpoint_test.o
 obj-$(CONFIG_OCXL)		+= ocxl/
 obj-$(CONFIG_MISC_RTSX)		+= cardreader/
+obj-$(CONFIG_VMGENID)		+= vmgenid.o
 
 lkdtm-$(CONFIG_LKDTM)		+= lkdtm_core.o
 lkdtm-$(CONFIG_LKDTM)		+= lkdtm_bugs.o

drivers/misc/vmgenid.c new file +142 -0

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