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Commit 6276a074 authored by Borislav Petkov's avatar Borislav Petkov Committed by H. Peter Anvin
Browse files

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: default avatarBorislav 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: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 2c59cad6

arch/x86/Kconfig

+45 −44
Original line number Diff line number Diff line
@@ -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

arch/x86/include/asm/hypervisor.h

+11 −5
Original line number Diff line number Diff line
@@ -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 */

arch/x86/kernel/cpu/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -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 $< $@

arch/x86/lguest/Kconfig

+1 −2
Original line number Diff line number Diff line 
config LGUEST_GUEST

	bool "Lguest guest support"

	select PARAVIRT

	depends on X86_32

	depends on X86_32 && PARAVIRT

	select TTY

	select VIRTUALIZATION

	select VIRTIO

arch/x86/xen/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -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)