Merge tag 'kvm-3.8-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull KVM updates from Marcelo Tosatti:
 "Considerable KVM/PPC work, x86 kvmclock vsyscall support,
  IA32_TSC_ADJUST MSR emulation, amongst others."

Fix up trivial conflict in kernel/sched/core.c due to cross-cpu
migration notifier added next to rq migration call-back.

* tag 'kvm-3.8-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (156 commits)
  KVM: emulator: fix real mode segment checks in address linearization
  VMX: remove unneeded enable_unrestricted_guest check
  KVM: VMX: fix DPL during entry to protected mode
  x86/kexec: crash_vmclear_local_vmcss needs __rcu
  kvm: Fix irqfd resampler list walk
  KVM: VMX: provide the vmclear function and a bitmap to support VMCLEAR in kdump
  x86/kexec: VMCLEAR VMCSs loaded on all cpus if necessary
  KVM: MMU: optimize for set_spte
  KVM: PPC: booke: Get/set guest EPCR register using ONE_REG interface
  KVM: PPC: bookehv: Add EPCR support in mtspr/mfspr emulation
  KVM: PPC: bookehv: Add guest computation mode for irq delivery
  KVM: PPC: Make EPCR a valid field for booke64 and bookehv
  KVM: PPC: booke: Extend MAS2 EPN mask for 64-bit
  KVM: PPC: e500: Mask MAS2 EPN high 32-bits in 32/64 tlbwe emulation
  KVM: PPC: Mask ea's high 32-bits in 32/64 instr emulation
  KVM: PPC: e500: Add emulation helper for getting instruction ea
  KVM: PPC: bookehv64: Add support for interrupt handling
  KVM: PPC: bookehv: Remove GET_VCPU macro from exception handler
  KVM: PPC: booke: Fix get_tb() compile error on 64-bit
  KVM: PPC: e500: Silence bogus GCC warning in tlb code
  ...

6 files changed, 91 insertions, 5 deletions

diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 7523539cfe9f..4e23ba2f3ca7 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -441,8 +441,7 @@ int main(void)
         DEFINE(KVM_HOST_LPCR, offsetof(struct kvm, arch.host_lpcr));
         DEFINE(KVM_HOST_SDR1, offsetof(struct kvm, arch.host_sdr1));
         DEFINE(KVM_TLBIE_LOCK, offsetof(struct kvm, arch.tlbie_lock));
-        DEFINE(KVM_ONLINE_CPUS, offsetof(struct kvm, online_vcpus.counter));
-        DEFINE(KVM_LAST_VCPU, offsetof(struct kvm, arch.last_vcpu));
+        DEFINE(KVM_NEED_FLUSH, offsetof(struct kvm, arch.need_tlb_flush.bits));
         DEFINE(KVM_LPCR, offsetof(struct kvm, arch.lpcr));
         DEFINE(KVM_RMOR, offsetof(struct kvm, arch.rmor));
         DEFINE(KVM_VRMA_SLB_V, offsetof(struct kvm, arch.vrma_slb_v));
@@ -470,7 +469,6 @@ int main(void)
         DEFINE(VCPU_SLB, offsetof(struct kvm_vcpu, arch.slb));
         DEFINE(VCPU_SLB_MAX, offsetof(struct kvm_vcpu, arch.slb_max));
         DEFINE(VCPU_SLB_NR, offsetof(struct kvm_vcpu, arch.slb_nr));
-        DEFINE(VCPU_LAST_CPU, offsetof(struct kvm_vcpu, arch.last_cpu));
         DEFINE(VCPU_FAULT_DSISR, offsetof(struct kvm_vcpu, arch.fault_dsisr));
         DEFINE(VCPU_FAULT_DAR, offsetof(struct kvm_vcpu, arch.fault_dar));
         DEFINE(VCPU_LAST_INST, offsetof(struct kvm_vcpu, arch.last_inst));
diff --git a/arch/powerpc/kernel/epapr_hcalls.S b/arch/powerpc/kernel/epapr_hcalls.S
index 697b390ebfd8..62c0dc237826 100644
--- a/arch/powerpc/kernel/epapr_hcalls.S
+++ b/arch/powerpc/kernel/epapr_hcalls.S
@@ -8,13 +8,41 @@
  */
 
 #include <linux/threads.h>
+#include <asm/epapr_hcalls.h>
 #include <asm/reg.h>
 #include <asm/page.h>
 #include <asm/cputable.h>
 #include <asm/thread_info.h>
 #include <asm/ppc_asm.h>
+#include <asm/asm-compat.h>
 #include <asm/asm-offsets.h>
 
+/* epapr_ev_idle() was derived from e500_idle() */
+_GLOBAL(epapr_ev_idle)
+        CURRENT_THREAD_INFO(r3, r1)
+        PPC_LL  r4, TI_LOCAL_FLAGS(r3)  /* set napping bit */
+        ori     r4, r4,_TLF_NAPPING     /* so when we take an exception */
+        PPC_STL r4, TI_LOCAL_FLAGS(r3)  /* it will return to our caller */
+
+        wrteei  1
+
+idle_loop:
+        LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE))
+
+.global epapr_ev_idle_start
+epapr_ev_idle_start:
+        li      r3, -1
+        nop
+        nop
+        nop
+
+        /*
+         * Guard against spurious wakeups from a hypervisor --
+         * only interrupt will cause us to return to LR due to
+         * _TLF_NAPPING.
+         */
+        b       idle_loop
+
 /* Hypercall entry point. Will be patched with device tree instructions. */
 .global epapr_hypercall_start
 epapr_hypercall_start:
diff --git a/arch/powerpc/kernel/epapr_paravirt.c b/arch/powerpc/kernel/epapr_paravirt.c
index 028aeae370b6..f3eab8594d9f 100644
--- a/arch/powerpc/kernel/epapr_paravirt.c
+++ b/arch/powerpc/kernel/epapr_paravirt.c
@@ -21,6 +21,10 @@
 #include <asm/epapr_hcalls.h>
 #include <asm/cacheflush.h>
 #include <asm/code-patching.h>
+#include <asm/machdep.h>
+
+extern void epapr_ev_idle(void);
+extern u32 epapr_ev_idle_start[];
 
 bool epapr_paravirt_enabled;
 
@@ -41,8 +45,13 @@ static int __init epapr_paravirt_init(void)
         if (len % 4 || len > (4 * 4))
                 return -ENODEV;
 
-        for (i = 0; i < (len / 4); i++)
+        for (i = 0; i < (len / 4); i++) {
                 patch_instruction(epapr_hypercall_start + i, insts[i]);
+                patch_instruction(epapr_ev_idle_start + i, insts[i]);
+        }
+
+        if (of_get_property(hyper_node, "has-idle", NULL))
+                ppc_md.power_save = epapr_ev_idle;
 
         epapr_paravirt_enabled = true;
 
diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 867db1de8949..a61b133c4f99 100644
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -419,7 +419,7 @@ static void kvm_map_magic_page(void *data)
         in[0] = KVM_MAGIC_PAGE;
         in[1] = KVM_MAGIC_PAGE;
 
-        kvm_hypercall(in, out, HC_VENDOR_KVM | KVM_HC_PPC_MAP_MAGIC_PAGE);
+        kvm_hypercall(in, out, KVM_HCALL_TOKEN(KVM_HC_PPC_MAP_MAGIC_PAGE));
 
         *features = out[0];
 }
diff --git a/arch/powerpc/kernel/ppc_ksyms.c b/arch/powerpc/kernel/ppc_ksyms.c
index 19e4288d8486..78b8766fd79e 100644
--- a/arch/powerpc/kernel/ppc_ksyms.c
+++ b/arch/powerpc/kernel/ppc_ksyms.c
@@ -43,6 +43,7 @@
 #include <asm/dcr.h>
 #include <asm/ftrace.h>
 #include <asm/switch_to.h>
+#include <asm/epapr_hcalls.h>
 
 #ifdef CONFIG_PPC32
 extern void transfer_to_handler(void);
@@ -191,3 +192,7 @@ EXPORT_SYMBOL(__arch_hweight64);
 #ifdef CONFIG_PPC_BOOK3S_64
 EXPORT_SYMBOL_GPL(mmu_psize_defs);
 #endif
+
+#ifdef CONFIG_EPAPR_PARAVIRT
+EXPORT_SYMBOL(epapr_hypercall_start);
+#endif
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 2b952b5386fd..e5b133ebd8a5 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -427,6 +427,45 @@ int generic_check_cpu_restart(unsigned int cpu)
 {
         return per_cpu(cpu_state, cpu) == CPU_UP_PREPARE;
 }
+
+static atomic_t secondary_inhibit_count;
+
+/*
+ * Don't allow secondary CPU threads to come online
+ */
+void inhibit_secondary_onlining(void)
+{
+        /*
+         * This makes secondary_inhibit_count stable during cpu
+         * online/offline operations.
+         */
+        get_online_cpus();
+
+        atomic_inc(&secondary_inhibit_count);
+        put_online_cpus();
+}
+EXPORT_SYMBOL_GPL(inhibit_secondary_onlining);
+
+/*
+ * Allow secondary CPU threads to come online again
+ */
+void uninhibit_secondary_onlining(void)
+{
+        get_online_cpus();
+        atomic_dec(&secondary_inhibit_count);
+        put_online_cpus();
+}
+EXPORT_SYMBOL_GPL(uninhibit_secondary_onlining);
+
+static int secondaries_inhibited(void)
+{
+        return atomic_read(&secondary_inhibit_count);
+}
+
+#else /* HOTPLUG_CPU */
+
+#define secondaries_inhibited()         0
+
 #endif
 
 static void cpu_idle_thread_init(unsigned int cpu, struct task_struct *idle)
@@ -445,6 +484,13 @@ int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *tidle)
 {
         int rc, c;
 
+        /*
+         * Don't allow secondary threads to come online if inhibited
+         */
+        if (threads_per_core > 1 && secondaries_inhibited() &&
+            cpu % threads_per_core != 0)
+                return -EBUSY;
+
         if (smp_ops == NULL ||
             (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu)))
                 return -EINVAL;