x86: Make Linux guest support optional

Put all config options needed to run Linux as a guest behind a
CONFIG_HYPERVISOR_GUEST menu so that they don't get built-in by default
but be selectable by the user. Also, make all units which depend on
x86_hyper, depend on this new symbol so that compilation doesn't fail
when CONFIG_HYPERVISOR_GUEST is disabled but those units assume its
presence.

Sort options in the new HYPERVISOR_GUEST menu, adapt config text and
drop redundant select.

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1362428421-9244-3-git-send-email-bp@alien8.de
Cc: Dmitry Torokhov <dtor@vmware.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

7 files changed, 62 insertions, 55 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index f922a9b9a319..e9e4623bd4da 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -389,7 +389,7 @@ config X86_NUMACHIP
 
 config X86_VSMP
         bool "ScaleMP vSMP"
-        select PARAVIRT_GUEST
+        select HYPERVISOR_GUEST
         select PARAVIRT
         depends on X86_64 && PCI
         depends on X86_EXTENDED_PLATFORM
@@ -596,44 +596,17 @@ config SCHED_OMIT_FRAME_POINTER
 
           If in doubt, say "Y".
 
-menuconfig PARAVIRT_GUEST
-        bool "Paravirtualized guest support"
+menuconfig HYPERVISOR_GUEST
+        bool "Linux guest support"
         ---help---
-          Say Y here to get to see options related to running Linux under
-          various hypervisors.  This option alone does not add any kernel code.
+          Say Y here to enable options for running Linux under various hyper-
+          visors. This option enables basic hypervisor detection and platform
+          setup.
 
-          If you say N, all options in this submenu will be skipped and disabled.
+          If you say N, all options in this submenu will be skipped and
+          disabled, and Linux guest support won't be built in.
 
-if PARAVIRT_GUEST
-
-config PARAVIRT_TIME_ACCOUNTING
-        bool "Paravirtual steal time accounting"
-        select PARAVIRT
-        default n
-        ---help---
-          Select this option to enable fine granularity task steal time
-          accounting. Time spent executing other tasks in parallel with
-          the current vCPU is discounted from the vCPU power. To account for
-          that, there can be a small performance impact.
-
-          If in doubt, say N here.
-
-source "arch/x86/xen/Kconfig"
-
-config KVM_GUEST
-        bool "KVM Guest support (including kvmclock)"
-        select PARAVIRT
-        select PARAVIRT
-        select PARAVIRT_CLOCK
-        default y if PARAVIRT_GUEST
-        ---help---
-          This option enables various optimizations for running under the KVM
-          hypervisor. It includes a paravirtualized clock, so that instead
-          of relying on a PIT (or probably other) emulation by the
-          underlying device model, the host provides the guest with
-          timing infrastructure such as time of day, and system time
-
-source "arch/x86/lguest/Kconfig"
+if HYPERVISOR_GUEST
 
 config PARAVIRT
         bool "Enable paravirtualization code"
@@ -643,6 +616,13 @@ config PARAVIRT
           over full virtualization.  However, when run without a hypervisor
           the kernel is theoretically slower and slightly larger.
 
+config PARAVIRT_DEBUG
+        bool "paravirt-ops debugging"
+        depends on PARAVIRT && DEBUG_KERNEL
+        ---help---
+          Enable to debug paravirt_ops internals.  Specifically, BUG if
+          a paravirt_op is missing when it is called.
+
 config PARAVIRT_SPINLOCKS
         bool "Paravirtualization layer for spinlocks"
         depends on PARAVIRT && SMP
@@ -656,17 +636,38 @@ config PARAVIRT_SPINLOCKS
 
           If you are unsure how to answer this question, answer N.
 
-config PARAVIRT_CLOCK
-        bool
+source "arch/x86/xen/Kconfig"
 
-config PARAVIRT_DEBUG
-        bool "paravirt-ops debugging"
-        depends on PARAVIRT && DEBUG_KERNEL
+config KVM_GUEST
+        bool "KVM Guest support (including kvmclock)"
+        depends on PARAVIRT
+        select PARAVIRT_CLOCK
+        default y
         ---help---
-          Enable to debug paravirt_ops internals.  Specifically, BUG if
-          a paravirt_op is missing when it is called.
+          This option enables various optimizations for running under the KVM
+          hypervisor. It includes a paravirtualized clock, so that instead
+          of relying on a PIT (or probably other) emulation by the
+          underlying device model, the host provides the guest with
+          timing infrastructure such as time of day, and system time
+
+source "arch/x86/lguest/Kconfig"
+
+config PARAVIRT_TIME_ACCOUNTING
+        bool "Paravirtual steal time accounting"
+        depends on PARAVIRT
+        default n
+        ---help---
+          Select this option to enable fine granularity task steal time
+          accounting. Time spent executing other tasks in parallel with
+          the current vCPU is discounted from the vCPU power. To account for
+          that, there can be a small performance impact.
+
+          If in doubt, say N here.
+
+config PARAVIRT_CLOCK
+        bool
 
-endif #PARAVIRT_GUEST
+endif #HYPERVISOR_GUEST
 
 config NO_BOOTMEM
         def_bool y
diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hypervisor.h
index 86095ed14135..2d4b5e6107cd 100644
--- a/arch/x86/include/asm/hypervisor.h
+++ b/arch/x86/include/asm/hypervisor.h
@@ -20,13 +20,11 @@
 #ifndef _ASM_X86_HYPERVISOR_H
 #define _ASM_X86_HYPERVISOR_H
 
+#ifdef CONFIG_HYPERVISOR_GUEST
+
 #include <asm/kvm_para.h>
 #include <asm/xen/hypervisor.h>
 
-extern void init_hypervisor(struct cpuinfo_x86 *c);
-extern void init_hypervisor_platform(void);
-extern bool hypervisor_x2apic_available(void);
-
 /*
  * x86 hypervisor information
  */
@@ -55,4 +53,12 @@ extern const struct hypervisor_x86 x86_hyper_ms_hyperv;
 extern const struct hypervisor_x86 x86_hyper_xen_hvm;
 extern const struct hypervisor_x86 x86_hyper_kvm;
 
-#endif
+extern void init_hypervisor(struct cpuinfo_x86 *c);
+extern void init_hypervisor_platform(void);
+extern bool hypervisor_x2apic_available(void);
+#else
+static inline void init_hypervisor(struct cpuinfo_x86 *c) { }
+static inline void init_hypervisor_platform(void) { }
+static inline bool hypervisor_x2apic_available(void) { return false; }
+#endif /* CONFIG_HYPERVISOR_GUEST */
+#endif /* _ASM_X86_HYPERVISOR_H */
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index a0e067d3d96c..5f81bcefbe14 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -14,7 +14,6 @@ CFLAGS_common.o		:= $(nostackp)
 
 obj-y                   := intel_cacheinfo.o scattered.o topology.o
 obj-y                   += proc.o capflags.o powerflags.o common.o
-obj-y                   += vmware.o hypervisor.o mshyperv.o
 obj-y                   += rdrand.o
 obj-y                   += match.o
 
@@ -42,6 +41,8 @@ obj-$(CONFIG_MTRR)			+= mtrr/
 
 obj-$(CONFIG_X86_LOCAL_APIC)            += perfctr-watchdog.o perf_event_amd_ibs.o
 
+obj-$(CONFIG_HYPERVISOR_GUEST)          += vmware.o hypervisor.o mshyperv.o
+
 quiet_cmd_mkcapflags = MKCAP   $@
       cmd_mkcapflags = $(PERL) $(srctree)/$(src)/mkcapflags.pl $< $@
 
diff --git a/arch/x86/lguest/Kconfig b/arch/x86/lguest/Kconfig
index 29043d2048a0..4a0890f815c4 100644
--- a/arch/x86/lguest/Kconfig
+++ b/arch/x86/lguest/Kconfig
@@ -1,7 +1,6 @@
 config LGUEST_GUEST
         bool "Lguest guest support"
-        select PARAVIRT
-        depends on X86_32
+        depends on X86_32 && PARAVIRT
         select TTY
         select VIRTUALIZATION
         select VIRTIO
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index 131dacd2748a..1a3c76505649 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -4,7 +4,7 @@
 
 config XEN
         bool "Xen guest support"
-        select PARAVIRT
+        depends on PARAVIRT
         select PARAVIRT_CLOCK
         select XEN_HAVE_PVMMU
         depends on X86_64 || (X86_32 && X86_PAE && !X86_VISWS)
diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
index 64630f15f181..0403b51d20ba 100644
--- a/drivers/hv/Kconfig
+++ b/drivers/hv/Kconfig
@@ -2,7 +2,7 @@ menu "Microsoft Hyper-V guest support"
 
 config HYPERV
         tristate "Microsoft Hyper-V client drivers"
-        depends on X86 && ACPI && PCI && X86_LOCAL_APIC
+        depends on X86 && ACPI && PCI && X86_LOCAL_APIC && HYPERVISOR_GUEST
         help
           Select this option to run Linux as a Hyper-V client operating
           system.
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index e83fdfe0c8ca..891123e31932 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -418,7 +418,7 @@ config TI_DAC7512
 
 config VMWARE_BALLOON
         tristate "VMware Balloon Driver"
-        depends on X86
+        depends on X86 && HYPERVISOR_GUEST
         help
           This is VMware physical memory management driver which acts
           like a "balloon" that can be inflated to reclaim physical pages