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

Browse Source 
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
This commit is contained in:
Linus Torvalds 2013-04-30 08:41:21 -07:00
commit 1e2f5b598a
18 changed files with 73 additions and 78 deletions
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89
arch/x86/Kconfig
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@ -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.
source "arch/x86/xen/Kconfig"
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
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
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.
endif #HYPERVISOR_GUEST
config NO_BOOTMEM
def_bool y

16
arch/x86/include/asm/hypervisor.h
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@ -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 */

4
arch/x86/include/asm/paravirt.h
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@ -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);

2
arch/x86/include/asm/paravirt_types.h
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@ -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);

1
arch/x86/include/asm/suspend_32.h
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@ -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;

3
arch/x86/include/asm/suspend_64.h
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@ -25,9 +25,6 @@ struct saved_context {
u64 misc_enable;
bool misc_enable_saved;
unsigned long efer;
u16 gdt_pad;
u16 gdt_limit;
unsigned long gdt_base;
u16 idt_pad;
u16 idt_limit;
unsigned long idt_base;

2
arch/x86/kernel/acpi/sleep.c
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@ -46,7 +46,7 @@ int acpi_suspend_lowlevel(void)
header->pmode_behavior = 0;
#ifndef CONFIG_64BIT
store_gdt((struct desc_ptr *)&header->pmode_gdt);
native_store_gdt((struct desc_ptr *)&header->pmode_gdt);
if (!rdmsr_safe(MSR_EFER,
&header->pmode_efer_low,

3
arch/x86/kernel/acpi/wakeup_32.S
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@ -18,7 +18,6 @@ wakeup_pmode_return:
movw %ax, %gs
# reload the gdt, as we need the full 32 bit address
lgdt saved_gdt
lidt saved_idt
lldt saved_ldt
ljmp $(__KERNEL_CS), $1f
@ -44,7 +43,6 @@ bogus_magic:
save_registers:
sgdt saved_gdt
sidt saved_idt
sldt saved_ldt
str saved_tss
@ -93,7 +91,6 @@ ENTRY(saved_magic) .long 0
ENTRY(saved_eip) .long 0
# saved registers
saved_gdt: .long 0,0
saved_idt: .long 0,0
saved_ldt: .long 0
saved_tss: .long 0

3
arch/x86/kernel/cpu/Makefile
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@ -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 = $(CONFIG_SHELL) $(srctree)/$(src)/mkcapflags.sh $< $@

2
arch/x86/kernel/doublefault_32.c
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@ -20,7 +20,7 @@ static void doublefault_fn(void)
struct desc_ptr gdt_desc = {0, 0};
unsigned long gdt, tss;
store_gdt(&gdt_desc);
native_store_gdt(&gdt_desc);
gdt = gdt_desc.address;
printk(KERN_EMERG "PANIC: double fault, gdt at %08lx [%d bytes]\n", gdt, gdt_desc.size);

1
arch/x86/kernel/paravirt.c
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@ -360,7 +360,6 @@ struct pv_cpu_ops pv_cpu_ops = {
.set_ldt = native_set_ldt,
.load_gdt = native_load_gdt,
.load_idt = native_load_idt,
.store_gdt = native_store_gdt,
.store_idt = native_store_idt,
.store_tr = native_store_tr,
.load_tls = native_load_tls,

2
arch/x86/kvm/vmx.c
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@ -2459,7 +2459,7 @@ static int hardware_enable(void *garbage)
ept_sync_global();
}
store_gdt(&__get_cpu_var(host_gdt));
native_store_gdt(&__get_cpu_var(host_gdt));
return 0;
}

3
arch/x86/lguest/Kconfig
View File

@ -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

13
arch/x86/power/cpu.c
View File

@ -62,11 +62,9 @@ static void __save_processor_state(struct saved_context *ctxt)
* descriptor tables
*/
#ifdef CONFIG_X86_32
store_gdt(&ctxt->gdt);
store_idt(&ctxt->idt);
#else
/* CONFIG_X86_64 */
store_gdt((struct desc_ptr *)&ctxt->gdt_limit);
store_idt((struct desc_ptr *)&ctxt->idt_limit);
#endif
store_tr(ctxt->tr);
@ -135,7 +133,10 @@ static void fix_processor_context(void)
{
int cpu = smp_processor_id();
struct tss_struct *t = &per_cpu(init_tss, cpu);
#ifdef CONFIG_X86_64
struct desc_struct *desc = get_cpu_gdt_table(cpu);
tss_desc tss;
#endif
set_tss_desc(cpu, t); /*
* This just modifies memory; should not be
* necessary. But... This is necessary, because
@ -144,7 +145,9 @@ static void fix_processor_context(void)
*/
#ifdef CONFIG_X86_64
get_cpu_gdt_table(cpu)[GDT_ENTRY_TSS].type = 9;
memcpy(&tss, &desc[GDT_ENTRY_TSS], sizeof(tss_desc));
tss.type = 0x9; /* The available 64-bit TSS (see AMD vol 2, pg 91 */
write_gdt_entry(desc, GDT_ENTRY_TSS, &tss, DESC_TSS);
syscall_init(); /* This sets MSR_*STAR and related */
#endif
@ -183,11 +186,9 @@ static void __restore_processor_state(struct saved_context *ctxt)
* ltr is done i fix_processor_context().
*/
#ifdef CONFIG_X86_32
load_gdt(&ctxt->gdt);
load_idt(&ctxt->idt);
#else
/* CONFIG_X86_64 */
load_gdt((const struct desc_ptr *)&ctxt->gdt_limit);
load_idt((const struct desc_ptr *)&ctxt->idt_limit);
#endif

2
arch/x86/xen/Kconfig
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@ -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)

1
arch/x86/xen/enlighten.c
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@ -1221,7 +1221,6 @@ static const struct pv_cpu_ops xen_cpu_ops __initconst = {
.alloc_ldt = xen_alloc_ldt,
.free_ldt = xen_free_ldt,
.store_gdt = native_store_gdt,
.store_idt = native_store_idt,
.store_tr = xen_store_tr,

2
drivers/hv/Kconfig
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@ -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.

2
drivers/misc/Kconfig
View File

@ -426,7 +426,7 @@ 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