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Subject[PATCH -v3 2/2] x86: Make Linux guest support optional
Date
From: Borislav Petkov <bp@suse.de>

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.

While at it, adjust text to changes, remove redundant select.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Dmitry Torokhov <dtor@vmware.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: devel@linuxdriverproject.org
---
arch/x86/Kconfig | 21 +++++++++++----------
arch/x86/include/asm/hypervisor.h | 12 ++++++++----
arch/x86/kernel/cpu/Makefile | 3 ++-
drivers/hv/Kconfig | 2 +-
drivers/misc/Kconfig | 2 +-
5 files changed, 23 insertions(+), 17 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 201b8aa93f8f..2380a52f0c8c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -379,7 +379,7 @@ 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
@@ -568,15 +568,17 @@ 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
+if HYPERVISOR_GUEST

config PARAVIRT_TIME_ACCOUNTING
bool "Paravirtual steal time accounting"
@@ -595,9 +597,8 @@ 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
+ default y
---help---
This option enables various optimizations for running under the KVM
hypervisor. It includes a paravirtualized clock, so that instead
@@ -638,7 +639,7 @@ config PARAVIRT_DEBUG
Enable to debug paravirt_ops internals. Specifically, BUG if
a paravirt_op is missing when it is called.

-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 b518c7509933..cd06ed8733cb 100644
--- a/arch/x86/include/asm/hypervisor.h
+++ b/arch/x86/include/asm/hypervisor.h
@@ -23,9 +23,6 @@
#include <asm/kvm_para.h>
#include <asm/xen/hypervisor.h>

-extern void init_hypervisor(struct cpuinfo_x86 *c);
-extern void init_hypervisor_platform(void);
-
/*
* x86 hypervisor information
*/
@@ -60,4 +57,11 @@ static inline bool hypervisor_x2apic_available(void)
return false;
}

-#endif
+#ifdef CONFIG_PARAVIRT
+extern void init_hypervisor(struct cpuinfo_x86 *c);
+extern void init_hypervisor_platform(void);
+#else
+static inline void init_hypervisor(struct cpuinfo_x86 *c) { }
+static inline void init_hypervisor_platform(void) { }
+#endif /* CONFIG_PARAVIRT */
+#endif /* _ASM_X86_HYPERVISOR_H */
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index a0e067d3d96c..8d04c7cd7cd3 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_PARAVIRT) += vmware.o hypervisor.o mshyperv.o
+
quiet_cmd_mkcapflags = MKCAP $@
cmd_mkcapflags = $(PERL) $(srctree)/$(src)/mkcapflags.pl $< $@

diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
index b38ef6d8d049..e05efc46744f 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
+ depends on X86 && ACPI && PCI && 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 b151b7c1bd59..c7092d5078e1 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
--
1.8.1.rc3


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