[RFC PATCH 01/12] drivers: hv: Add HYPERV_VSM kconfig option

[Thara Gopinath]

Introduce CONFIG_HYPERV_VSM, the top-level switch that gates
VTL0-side support for Microsoft Hyper-V's Virtual Secure Mode (VSM).
Enabling it lets the VTL0 kernel load a small secure kernel into
VTL1 and stand up the VTL0<->VTL1 interfaces needed to request
VSM services.

Depends on HYPERV and on X86_64 which is the only architecture currently
implemented.

Signed-off-by: Thara Gopinath <tgopinath@xxxxxxxxxxxxxxxxxxx>
---
 drivers/hv/Kconfig | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
index aa11bcefddf2c..a325fc61be604 100644
--- a/drivers/hv/Kconfig
+++ b/drivers/hv/Kconfig
@@ -40,6 +40,15 @@ config HYPERV_VTL_MODE
 
 	  If unsure, say N
 
+config HYPERV_VSM
+	bool "Microsoft Hyper-V VSM driver"
+	depends on HYPERV && X86_64
+	help
+	  Select this option to enable Hyper-V Virtual Secure Mode.
+	  Enabling this option will load a secure kernel in VTL1 and
+	  establish an interface between VTL0 and VTL1 to request for
+	  VSM services.
+
 config HYPERV_TIMER
 	def_bool HYPERV && X86
 
-- 
2.34.1