x86/hvm: add HVM-specific Kconfig

Add a separate menu for configuring HVM build-time settings to better
organize HVM-specific options.

HVM options will now appear in a dedicated sub-menu in the menuconfig
tool.

Also, make AMD_SVM config dependent on AMD config and INTEL_VMX on INTEL
respectively.

Signed-off-by: Denis Mukhin <dmukhin@ford.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

xen/arch/x86/Kconfig

@@ -107,42 +107,7 @@ config PV_LINEAR_PT
 
          If unsure, say Y.
 
-config HVM
+source "arch/x86/hvm/Kconfig"
-	bool "HVM support"
-	depends on !PV_SHIM_EXCLUSIVE
-	default !PV_SHIM
-	select COMPAT
-	select IOREQ_SERVER
-	select MEM_ACCESS_ALWAYS_ON
-	help
-	  Interfaces to support HVM domains.  HVM domains require hardware
-	  virtualisation extensions (e.g. Intel VT-x, AMD SVM), but can boot
-	  guests which have no specific Xen knowledge.
-
-	  This option is needed if you want to run HVM or PVH domains.
-
-	  If unsure, say Y.
-
-config AMD_SVM
-	bool "AMD-V" if EXPERT
-	depends on HVM
-	default y
-	help
-	  Enables virtual machine extensions on platforms that implement the
-	  AMD Virtualization Technology (AMD-V).
-	  If your system includes a processor with AMD-V support, say Y.
-	  If in doubt, say Y.
-
-config INTEL_VMX
-	bool "Intel VT-x" if EXPERT
-	depends on HVM
-	default y
-	select ARCH_VCPU_IOREQ_COMPLETION
-	help
-	  Enables virtual machine extensions on platforms that implement the
-	  Intel Virtualization Technology (Intel VT-x).
-	  If your system includes a processor with Intel VT-x support, say Y.
-	  If in doubt, say Y.
 
 config XEN_SHSTK
 	bool "Supervisor Shadow Stacks"
@@ -201,25 +166,6 @@ config BIGMEM
 
 	  If unsure, say N.
 
-config HVM_FEP
-	bool "HVM Forced Emulation Prefix support (UNSUPPORTED)" if UNSUPPORTED
-	default DEBUG
-	depends on HVM
-	help
-
-	  Compiles in a feature that allows HVM guest to arbitrarily
-	  exercise the instruction emulator.
-
-	  This feature can only be enabled during boot time with
-	  appropriate hypervisor command line option. Please read
-	  hypervisor command line documentation before trying to use
-	  this feature.
-
-	  This is strictly for testing purposes, and not appropriate
-	  for use in production.
-
-	  If unsure, say N.
-
 config TBOOT
 	bool "Xen tboot support (UNSUPPORTED)"
 	depends on INTEL && UNSUPPORTED
@@ -348,14 +294,6 @@ config HYPERV_GUEST
 
 endif
 
-config MEM_PAGING
-	bool "Xen memory paging support (UNSUPPORTED)" if UNSUPPORTED
-	depends on HVM && VM_EVENT
-
-config MEM_SHARING
-	bool "Xen memory sharing support (UNSUPPORTED)" if UNSUPPORTED
-	depends on HVM
-
 config REQUIRE_NX
 	bool "Require NX (No eXecute) support"
 	help
@@ -372,17 +310,6 @@ config REQUIRE_NX
 	  was unavailable. However, if enabled, Xen will no longer boot on
 	  any CPU which is lacking NX support.
 
-config ALTP2M
-	bool "Alternate P2M support" if EXPERT
-	depends on INTEL_VMX
-	default y
-	help
-	  Alternate-p2m allows a guest to manage multiple p2m guest physical
-	  "memory views" (as opposed to a single p2m).
-	  Useful for memory introspection.
-
-	  If unsure, stay with defaults.
-
 config UCODE_SCAN_DEFAULT
 	bool "Scan for microcode by default"
 	help

xen/arch/x86/hvm/Kconfig

@@ -0,0 +1,73 @@
+menuconfig HVM
+	bool "HVM support"
+	depends on !PV_SHIM_EXCLUSIVE
+	default !PV_SHIM
+	select COMPAT
+	select IOREQ_SERVER
+	select MEM_ACCESS_ALWAYS_ON
+	help
+	  Interfaces to support HVM domains.  HVM domains require hardware
+	  virtualisation extensions (e.g. Intel VT-x, AMD SVM), but can boot
+	  guests which have no specific Xen knowledge.
+
+	  This option is needed if you want to run HVM or PVH domains.
+
+	  If unsure, say Y.
+
+if HVM
+
+config AMD_SVM
+	bool "AMD-V" if AMD && EXPERT
+	default y
+	help
+	  Enables virtual machine extensions on platforms that implement the
+	  AMD Virtualization Technology (AMD-V).
+	  If your system includes a processor with AMD-V support, say Y.
+	  If in doubt, say Y.
+
+config INTEL_VMX
+	bool "Intel VT-x" if INTEL && EXPERT
+	default y
+	select ARCH_VCPU_IOREQ_COMPLETION
+	help
+	  Enables virtual machine extensions on platforms that implement the
+	  Intel Virtualization Technology (Intel VT-x).
+	  If your system includes a processor with Intel VT-x support, say Y.
+	  If in doubt, say Y.
+
+config HVM_FEP
+	bool "HVM Forced Emulation Prefix support (UNSUPPORTED)" if UNSUPPORTED
+	default DEBUG
+	help
+	  Compiles in a feature that allows HVM guest to arbitrarily
+	  exercise the instruction emulator.
+
+	  This feature can only be enabled during boot time with
+	  appropriate hypervisor command line option. Please read
+	  hypervisor command line documentation before trying to use
+	  this feature.
+
+	  This is strictly for testing purposes, and not appropriate
+	  for use in production.
+
+	  If unsure, say N.
+
+config ALTP2M
+	bool "Alternate P2M support" if EXPERT
+	depends on INTEL_VMX
+	default y
+	help
+	  Alternate-p2m allows a guest to manage multiple p2m guest physical
+	  "memory views" (as opposed to a single p2m).
+	  Useful for memory introspection.
+
+	  If unsure, stay with defaults.
+
+config MEM_PAGING
+	bool "Xen memory paging support (UNSUPPORTED)" if UNSUPPORTED
+	depends on VM_EVENT
+
+config MEM_SHARING
+	bool "Xen memory sharing support (UNSUPPORTED)" if UNSUPPORTED
+
+endif