Commit-ID: 6276a074c6519946c527f03e2ab69770a62652d9 Gitweb: http://git.kernel.org/tip/6276a074c6519946c527f03e2ab69770a62652d9 Author: Borislav Petkov <b...@suse.de> AuthorDate: Mon, 4 Mar 2013 21:20:21 +0100 Committer: H. Peter Anvin <h...@linux.intel.com> CommitDate: Mon, 4 Mar 2013 13:14:25 -0800
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 <b...@suse.de> Link: http://lkml.kernel.org/r/1362428421-9244-3-git-send-email...@alien8.de Cc: Dmitry Torokhov <d...@vmware.com> Cc: K. Y. Srinivasan <k...@microsoft.com> Cc: Haiyang Zhang <haiya...@microsoft.com> Signed-off-by: H. Peter Anvin <h...@linux.intel.com> --- arch/x86/Kconfig | 89 ++++++++++++++++++++------------------- arch/x86/include/asm/hypervisor.h | 16 ++++--- arch/x86/kernel/cpu/Makefile | 3 +- arch/x86/lguest/Kconfig | 3 +- arch/x86/xen/Kconfig | 2 +- drivers/hv/Kconfig | 2 +- drivers/misc/Kconfig | 2 +- 7 files changed, 62 insertions(+), 55 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index f922a9b..e9e4623 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 86095ed..2d4b5e6 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 a0e067d..5f81bce 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 29043d2..4a0890f 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 131dacd..1a3c765 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 64630f1..0403b51 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 e83fdfe..891123e 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
