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

18 files changed, 73 insertions, 78 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index e93ccb9b1cc1..05b057dca4a7 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -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
diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hypervisor.h
index 86095ed14135..2d4b5e6107cd 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/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 7361e47db79f..cfdc9ee4c900 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -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);
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index b3b0ec1dac86..0db1fcac668c 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -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);
diff --git a/arch/x86/include/asm/suspend_32.h b/arch/x86/include/asm/suspend_32.h
index 487055c8c1aa..f6064b7385b0 100644
--- a/arch/x86/include/asm/suspend_32.h
+++ b/arch/x86/include/asm/suspend_32.h
@@ -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;
diff --git a/arch/x86/include/asm/suspend_64.h b/arch/x86/include/asm/suspend_64.h
index 09b0bf104156..97b84e08a211 100644
--- a/arch/x86/include/asm/suspend_64.h
+++ b/arch/x86/include/asm/suspend_64.h
@@ -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;
diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index 0532f5d6e4ef..b44577bc9744 100644
--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -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,
diff --git a/arch/x86/kernel/acpi/wakeup_32.S b/arch/x86/kernel/acpi/wakeup_32.S
index ced4638c8341..d1daa66ab162 100644
--- a/arch/x86/kernel/acpi/wakeup_32.S
+++ b/arch/x86/kernel/acpi/wakeup_32.S
@@ -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
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index deef0399fc78..b0684e4a73aa 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 = $(CONFIG_SHELL) $(srctree)/$(src)/mkcapflags.sh $< $@
 
diff --git a/arch/x86/kernel/doublefault_32.c b/arch/x86/kernel/doublefault_32.c
index 37250fe490b1..155a13f33ed8 100644
--- a/arch/x86/kernel/doublefault_32.c
+++ b/arch/x86/kernel/doublefault_32.c
@@ -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);
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index 8bfb335f74bb..cd6de64cc480 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -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,
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 6667042714cc..867b81037f96 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -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;
 }
diff --git a/arch/x86/lguest/Kconfig b/arch/x86/lguest/Kconfig
index 29043d2048a0..4a0890f815c4 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/power/cpu.c b/arch/x86/power/cpu.c
index 3c68768d7a75..6d6e907cee46 100644
--- a/arch/x86/power/cpu.c
+++ b/arch/x86/power/cpu.c
@@ -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
 
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index 131dacd2748a..1a3c76505649 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/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index ddbd54a9b845..53d4f680c9b5 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -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,
 
diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
index 64630f15f181..0403b51d20ba 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 3659d00efdc5..c002d8660e30 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -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