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Commit 1e2f5b59 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 paravirt update from Ingo Molnar:
 "Various paravirtualization related changes - the biggest one makes
  guest support optional via CONFIG_HYPERVISOR_GUEST"

* 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, wakeup, sleep: Use pvops functions for changing GDT entries
  x86, xen, gdt: Remove the pvops variant of store_gdt.
  x86-32, gdt: Store/load GDT for ACPI S3 or hibernation/resume path is not needed
  x86-64, gdt: Store/load GDT for ACPI S3 or hibernate/resume path is not needed.
  x86: Make Linux guest support optional
  x86, Kconfig: Move PARAVIRT_DEBUG into the paravirt menu
parents f9b3bcfb 4d681be3

arch/x86/Kconfig

+45 −44
Original line number Diff line number Diff line
@@ -387,7 +387,7 @@ 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
@@ -594,44 +594,17 @@ 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"
@@ -641,6 +614,13 @@ 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
@@ -654,17 +634,38 @@ config PARAVIRT_SPINLOCKS 


	  If you are unsure how to answer this question, answer N.



config PARAVIRT_CLOCK

	bool

source "arch/x86/xen/Kconfig"



endif

config KVM_GUEST

	bool "KVM Guest support (including kvmclock)"

	depends on PARAVIRT

	select PARAVIRT_CLOCK

	default y

	---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



config PARAVIRT_DEBUG

	bool "paravirt-ops debugging"

	depends on PARAVIRT && DEBUG_KERNEL

source "arch/x86/lguest/Kconfig"



config PARAVIRT_TIME_ACCOUNTING

	bool "Paravirtual steal time accounting"

	depends on PARAVIRT

	default n

	---help---

	  Enable to debug paravirt_ops internals.  Specifically, BUG if

	  a paravirt_op is missing when it is called.

	  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 #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/include/asm/paravirt.h

+0 −4
Original line number Diff line number Diff line
@@ -262,10 +262,6 @@ static inline void set_ldt(const void *addr, unsigned entries) 
{

	PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);

}

static inline void store_gdt(struct desc_ptr *dtr)

{

	PVOP_VCALL1(pv_cpu_ops.store_gdt, dtr);

}

static inline void store_idt(struct desc_ptr *dtr)

{

	PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);

arch/x86/include/asm/paravirt_types.h

+1 −1
Original line number Diff line number Diff line
@@ -123,7 +123,7 @@ struct pv_cpu_ops { 
	void (*load_tr_desc)(void);

	void (*load_gdt)(const struct desc_ptr *);

	void (*load_idt)(const struct desc_ptr *);

	void (*store_gdt)(struct desc_ptr *);

	/* store_gdt has been removed. */

	void (*store_idt)(struct desc_ptr *);

	void (*set_ldt)(const void *desc, unsigned entries);

	unsigned long (*store_tr)(void);

arch/x86/include/asm/suspend_32.h

+0 −1
Original line number Diff line number Diff line
@@ -15,7 +15,6 @@ struct saved_context { 
	unsigned long cr0, cr2, cr3, cr4;

	u64 misc_enable;

	bool misc_enable_saved;

	struct desc_ptr gdt;

	struct desc_ptr idt;

	u16 ldt;

	u16 tss;