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>
This commit is contained in:
Borislav Petkov
H. Peter Anvin
parent
2c59cad694
commit
6276a074c6
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@ -389,7 +389,7 @@ config X86_NUMACHIP
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config X86_VSMP
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bool "ScaleMP vSMP"
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select PARAVIRT_GUEST
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select HYPERVISOR_GUEST
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select PARAVIRT
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depends on X86_64 && PCI
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depends on X86_EXTENDED_PLATFORM
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@ -596,44 +596,17 @@ config SCHED_OMIT_FRAME_POINTER
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If in doubt, say "Y".
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menuconfig PARAVIRT_GUEST
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bool "Paravirtualized guest support"
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menuconfig HYPERVISOR_GUEST
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bool "Linux guest support"
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---help---
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Say Y here to get to see options related to running Linux under
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various hypervisors. This option alone does not add any kernel code.
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Say Y here to enable options for running Linux under various hyper-
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visors. This option enables basic hypervisor detection and platform
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setup.
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If you say N, all options in this submenu will be skipped and disabled.
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If you say N, all options in this submenu will be skipped and
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disabled, and Linux guest support won't be built in.
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if PARAVIRT_GUEST
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config PARAVIRT_TIME_ACCOUNTING
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bool "Paravirtual steal time accounting"
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select PARAVIRT
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default n
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---help---
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Select this option to enable fine granularity task steal time
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accounting. Time spent executing other tasks in parallel with
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the current vCPU is discounted from the vCPU power. To account for
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that, there can be a small performance impact.
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If in doubt, say N here.
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source "arch/x86/xen/Kconfig"
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config KVM_GUEST
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bool "KVM Guest support (including kvmclock)"
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select PARAVIRT
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select PARAVIRT
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select PARAVIRT_CLOCK
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default y if PARAVIRT_GUEST
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---help---
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This option enables various optimizations for running under the KVM
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hypervisor. It includes a paravirtualized clock, so that instead
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of relying on a PIT (or probably other) emulation by the
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underlying device model, the host provides the guest with
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timing infrastructure such as time of day, and system time
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source "arch/x86/lguest/Kconfig"
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if HYPERVISOR_GUEST
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config PARAVIRT
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bool "Enable paravirtualization code"
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@ -643,6 +616,13 @@ config PARAVIRT
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over full virtualization. However, when run without a hypervisor
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the kernel is theoretically slower and slightly larger.
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config PARAVIRT_DEBUG
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bool "paravirt-ops debugging"
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depends on PARAVIRT && DEBUG_KERNEL
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---help---
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Enable to debug paravirt_ops internals. Specifically, BUG if
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a paravirt_op is missing when it is called.
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config PARAVIRT_SPINLOCKS
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bool "Paravirtualization layer for spinlocks"
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depends on PARAVIRT && SMP
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@ -656,17 +636,38 @@ config PARAVIRT_SPINLOCKS
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If you are unsure how to answer this question, answer N.
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source "arch/x86/xen/Kconfig"
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config KVM_GUEST
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bool "KVM Guest support (including kvmclock)"
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depends on PARAVIRT
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select PARAVIRT_CLOCK
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default y
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---help---
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This option enables various optimizations for running under the KVM
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hypervisor. It includes a paravirtualized clock, so that instead
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of relying on a PIT (or probably other) emulation by the
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underlying device model, the host provides the guest with
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timing infrastructure such as time of day, and system time
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source "arch/x86/lguest/Kconfig"
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config PARAVIRT_TIME_ACCOUNTING
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bool "Paravirtual steal time accounting"
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depends on PARAVIRT
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default n
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---help---
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Select this option to enable fine granularity task steal time
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accounting. Time spent executing other tasks in parallel with
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the current vCPU is discounted from the vCPU power. To account for
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that, there can be a small performance impact.
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If in doubt, say N here.
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config PARAVIRT_CLOCK
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bool
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config PARAVIRT_DEBUG
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bool "paravirt-ops debugging"
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depends on PARAVIRT && DEBUG_KERNEL
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---help---
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Enable to debug paravirt_ops internals. Specifically, BUG if
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a paravirt_op is missing when it is called.
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endif #PARAVIRT_GUEST
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endif #HYPERVISOR_GUEST
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config NO_BOOTMEM
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def_bool y
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@ -20,13 +20,11 @@
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#ifndef _ASM_X86_HYPERVISOR_H
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#define _ASM_X86_HYPERVISOR_H
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#ifdef CONFIG_HYPERVISOR_GUEST
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#include <asm/kvm_para.h>
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#include <asm/xen/hypervisor.h>
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extern void init_hypervisor(struct cpuinfo_x86 *c);
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extern void init_hypervisor_platform(void);
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extern bool hypervisor_x2apic_available(void);
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/*
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* x86 hypervisor information
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*/
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@ -55,4 +53,12 @@ extern const struct hypervisor_x86 x86_hyper_ms_hyperv;
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extern const struct hypervisor_x86 x86_hyper_xen_hvm;
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extern const struct hypervisor_x86 x86_hyper_kvm;
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#endif
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extern void init_hypervisor(struct cpuinfo_x86 *c);
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extern void init_hypervisor_platform(void);
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extern bool hypervisor_x2apic_available(void);
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#else
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static inline void init_hypervisor(struct cpuinfo_x86 *c) { }
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static inline void init_hypervisor_platform(void) { }
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static inline bool hypervisor_x2apic_available(void) { return false; }
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#endif /* CONFIG_HYPERVISOR_GUEST */
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#endif /* _ASM_X86_HYPERVISOR_H */
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@ -14,7 +14,6 @@ CFLAGS_common.o := $(nostackp)
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obj-y := intel_cacheinfo.o scattered.o topology.o
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obj-y += proc.o capflags.o powerflags.o common.o
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obj-y += vmware.o hypervisor.o mshyperv.o
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obj-y += rdrand.o
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obj-y += match.o
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@ -42,6 +41,8 @@ obj-$(CONFIG_MTRR) += mtrr/
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obj-$(CONFIG_X86_LOCAL_APIC) += perfctr-watchdog.o perf_event_amd_ibs.o
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obj-$(CONFIG_HYPERVISOR_GUEST) += vmware.o hypervisor.o mshyperv.o
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quiet_cmd_mkcapflags = MKCAP $@
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cmd_mkcapflags = $(PERL) $(srctree)/$(src)/mkcapflags.pl $< $@
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@ -1,7 +1,6 @@
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config LGUEST_GUEST
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bool "Lguest guest support"
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select PARAVIRT
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depends on X86_32
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depends on X86_32 && PARAVIRT
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select TTY
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select VIRTUALIZATION
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select VIRTIO
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@ -4,7 +4,7 @@
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config XEN
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bool "Xen guest support"
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select PARAVIRT
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depends on PARAVIRT
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select PARAVIRT_CLOCK
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select XEN_HAVE_PVMMU
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depends on X86_64 || (X86_32 && X86_PAE && !X86_VISWS)
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@ -2,7 +2,7 @@ menu "Microsoft Hyper-V guest support"
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config HYPERV
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tristate "Microsoft Hyper-V client drivers"
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depends on X86 && ACPI && PCI && X86_LOCAL_APIC
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depends on X86 && ACPI && PCI && X86_LOCAL_APIC && HYPERVISOR_GUEST
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help
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Select this option to run Linux as a Hyper-V client operating
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system.
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@ -418,7 +418,7 @@ config TI_DAC7512
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config VMWARE_BALLOON
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tristate "VMware Balloon Driver"
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depends on X86
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depends on X86 && HYPERVISOR_GUEST
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help
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This is VMware physical memory management driver which acts
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like a "balloon" that can be inflated to reclaim physical pages
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