20 files changed, 161 insertions, 28 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index a9fbd43395f7..373679b3744a 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -572,6 +572,7 @@ config KEXEC
 config CRASH_DUMP
        bool "kernel crash dumps"
        depends on 64BIT
+        select KEXEC
        help
          Generate crash dump after being started by kexec.
          Crash dump kernels are loaded in the main kernel with kexec-tools
diff --git a/arch/s390/crypto/crypt_s390.h b/arch/s390/crypto/crypt_s390.h
index 49676771bd66..ffd1ac255f19 100644
--- a/arch/s390/crypto/crypt_s390.h
+++ b/arch/s390/crypto/crypt_s390.h
@@ -368,9 +368,12 @@ static inline int crypt_s390_func_available(int func,
        if (facility_mask & CRYPT_S390_MSA && !test_facility(17))
                return 0;
-        if (facility_mask & CRYPT_S390_MSA3 && !test_facility(76))
+        if (facility_mask & CRYPT_S390_MSA3 &&
+            (!test_facility(2) || !test_facility(76)))
                return 0;
-        if (facility_mask & CRYPT_S390_MSA4 && !test_facility(77))
+        if (facility_mask & CRYPT_S390_MSA4 &&
+            (!test_facility(2) || !test_facility(77)))
                return 0;
        switch (func & CRYPT_S390_OP_MASK) {
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 24e18473d926..b0c235cb6ad5 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -47,7 +47,7 @@ struct sca_block {
 #define KVM_HPAGE_MASK(x)       (~(KVM_HPAGE_SIZE(x) - 1))
 #define KVM_PAGES_PER_HPAGE(x)  (KVM_HPAGE_SIZE(x) / PAGE_SIZE)
-#define CPUSTAT_HOST       0x80000000
+#define CPUSTAT_STOPPED    0x80000000
 #define CPUSTAT_WAIT       0x10000000
 #define CPUSTAT_ECALL_PEND 0x08000000
 #define CPUSTAT_STOP_INT   0x04000000
@@ -139,6 +139,7 @@ struct kvm_vcpu_stat {
        u32 instruction_stfl;
        u32 instruction_tprot;
        u32 instruction_sigp_sense;
+        u32 instruction_sigp_sense_running;
        u32 instruction_sigp_external_call;
        u32 instruction_sigp_emergency;
        u32 instruction_sigp_stop;
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 34ede0ea85a9..524d23b8610c 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -593,6 +593,8 @@ static inline pgste_t pgste_update_all(pte_t *ptep, pgste_t pgste)
        unsigned long address, bits;
        unsigned char skey;
+        if (!pte_present(*ptep))
+                return pgste;
        address = pte_val(*ptep) & PAGE_MASK;
        skey = page_get_storage_key(address);
        bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED);
@@ -625,6 +627,8 @@ static inline pgste_t pgste_update_young(pte_t *ptep, pgste_t pgste)
 #ifdef CONFIG_PGSTE
        int young;
+        if (!pte_present(*ptep))
+                return pgste;
        young = page_reset_referenced(pte_val(*ptep) & PAGE_MASK);
        /* Transfer page referenced bit to pte software bit (host view) */
        if (young || (pgste_val(pgste) & RCP_HR_BIT))
@@ -638,13 +642,15 @@ static inline pgste_t pgste_update_young(pte_t *ptep, pgste_t pgste)
 }
-static inline void pgste_set_pte(pte_t *ptep, pgste_t pgste)
+static inline void pgste_set_pte(pte_t *ptep, pgste_t pgste, pte_t entry)
 {
 #ifdef CONFIG_PGSTE
        unsigned long address;
        unsigned long okey, nkey;
-        address = pte_val(*ptep) & PAGE_MASK;
+        if (!pte_present(entry))
+                return;
+        address = pte_val(entry) & PAGE_MASK;
        okey = nkey = page_get_storage_key(address);
        nkey &= ~(_PAGE_ACC_BITS | _PAGE_FP_BIT);
        /* Set page access key and fetch protection bit from pgste */
@@ -712,7 +718,7 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
        if (mm_has_pgste(mm)) {
                pgste = pgste_get_lock(ptep);
-                pgste_set_pte(ptep, pgste);
+                pgste_set_pte(ptep, pgste, entry);
                *ptep = entry;
                pgste_set_unlock(ptep, pgste);
        } else
diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index 5a099714df04..097183c70407 100644
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -82,6 +82,7 @@ extern unsigned int user_mode;
 #define MACHINE_FLAG_LPAR       (1UL << 12)
 #define MACHINE_FLAG_SPP        (1UL << 13)
 #define MACHINE_FLAG_TOPOLOGY   (1UL << 14)
+#define MACHINE_FLAG_STCKF      (1UL << 15)
 #define MACHINE_IS_VM           (S390_lowcore.machine_flags & MACHINE_FLAG_VM)
 #define MACHINE_IS_KVM          (S390_lowcore.machine_flags & MACHINE_FLAG_KVM)
@@ -100,6 +101,7 @@ extern unsigned int user_mode;
 #define MACHINE_HAS_PFMF        (0)
 #define MACHINE_HAS_SPP         (0)
 #define MACHINE_HAS_TOPOLOGY    (0)
+#define MACHINE_HAS_STCKF       (0)
 #else /* __s390x__ */
 #define MACHINE_HAS_IEEE        (1)
 #define MACHINE_HAS_CSP         (1)
@@ -111,6 +113,7 @@ extern unsigned int user_mode;
 #define MACHINE_HAS_PFMF        (S390_lowcore.machine_flags & MACHINE_FLAG_PFMF)
 #define MACHINE_HAS_SPP         (S390_lowcore.machine_flags & MACHINE_FLAG_SPP)
 #define MACHINE_HAS_TOPOLOGY    (S390_lowcore.machine_flags & MACHINE_FLAG_TOPOLOGY)
+#define MACHINE_HAS_STCKF       (S390_lowcore.machine_flags & MACHINE_FLAG_STCKF)
 #endif /* __s390x__ */
 #define ZFCPDUMP_HSA_SIZE       (32UL<<20)
diff --git a/arch/s390/include/asm/timex.h b/arch/s390/include/asm/timex.h
index d610bef9c5e9..c447a27a7fdb 100644
--- a/arch/s390/include/asm/timex.h
+++ b/arch/s390/include/asm/timex.h
@@ -90,7 +90,7 @@ static inline unsigned long long get_clock_fast(void)
 {
        unsigned long long clk;
-        if (test_facility(25))
+        if (MACHINE_HAS_STCKF)
                asm volatile(".insn     s,0xb27c0000,%0" : "=Q" (clk) : : "cc");
        else
                clk = get_clock();
diff --git a/arch/s390/include/asm/unistd.h b/arch/s390/include/asm/unistd.h
index 404bdb9671b4..58de4c91c333 100644
--- a/arch/s390/include/asm/unistd.h
+++ b/arch/s390/include/asm/unistd.h
@@ -277,7 +277,9 @@
 #define __NR_clock_adjtime      337
 #define __NR_syncfs             338
 #define __NR_setns              339
-#define NR_syscalls 340
+#define __NR_process_vm_readv   340
+#define __NR_process_vm_writev  341
+#define NR_syscalls 342
 /* 
 * There are some system calls that are not present on 64 bit, some
diff --git a/arch/s390/kernel/compat_wrapper.S b/arch/s390/kernel/compat_wrapper.S
index 5006a1d9f5d0..18c51df9fe06 100644
--- a/arch/s390/kernel/compat_wrapper.S
+++ b/arch/s390/kernel/compat_wrapper.S
@@ -1627,3 +1627,23 @@ ENTRY(sys_setns_wrapper)
        lgfr    %r2,%r2                 # int
        lgfr    %r3,%r3                 # int
        jg      sys_setns
+ENTRY(compat_sys_process_vm_readv_wrapper)
+        lgfr    %r2,%r2                 # compat_pid_t
+        llgtr   %r3,%r3                 # struct compat_iovec __user *
+        llgfr   %r4,%r4                 # unsigned long
+        llgtr   %r5,%r5                 # struct compat_iovec __user *
+        llgfr   %r6,%r6                 # unsigned long
+        llgf    %r0,164(%r15)           # unsigned long
+        stg     %r0,160(%r15)
+        jg      sys_process_vm_readv
+ENTRY(compat_sys_process_vm_writev_wrapper)
+        lgfr    %r2,%r2                 # compat_pid_t
+        llgtr   %r3,%r3                 # struct compat_iovec __user *
+        llgfr   %r4,%r4                 # unsigned long
+        llgtr   %r5,%r5                 # struct compat_iovec __user *
+        llgfr   %r6,%r6                 # unsigned long
+        llgf    %r0,164(%r15)           # unsigned long
+        stg     %r0,160(%r15)
+        jg      sys_process_vm_writev
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 37394b3413e2..c9ffe0025197 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -390,6 +390,8 @@ static __init void detect_machine_facilities(void)
                S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS;
        if (test_facility(40))
                S390_lowcore.machine_flags |= MACHINE_FLAG_SPP;
+        if (test_facility(25))
+                S390_lowcore.machine_flags |= MACHINE_FLAG_STCKF;
 #endif
 }
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 8ac6bfa2786c..e58a462949b1 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -211,6 +211,8 @@ static void __init setup_zfcpdump(unsigned int console_devno)
        if (ipl_info.type != IPL_TYPE_FCP_DUMP)
                return;
+        if (OLDMEM_BASE)
+                return;
        if (console_devno != -1)
                sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
                        ipl_info.data.fcp.dev_id.devno, console_devno);
@@ -482,7 +484,7 @@ static void __init setup_memory_end(void)
 #ifdef CONFIG_ZFCPDUMP
-        if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
+        if (ipl_info.type == IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) {
                memory_end = ZFCPDUMP_HSA_SIZE;
                memory_end_set = 1;
        }
diff --git a/arch/s390/kernel/syscalls.S b/arch/s390/kernel/syscalls.S
index 73eb08c874fb..bcab2f04ba58 100644
--- a/arch/s390/kernel/syscalls.S
+++ b/arch/s390/kernel/syscalls.S
@@ -348,3 +348,5 @@ SYSCALL(sys_open_by_handle_at,sys_open_by_handle_at,compat_sys_open_by_handle_at
 SYSCALL(sys_clock_adjtime,sys_clock_adjtime,compat_sys_clock_adjtime_wrapper)
 SYSCALL(sys_syncfs,sys_syncfs,sys_syncfs_wrapper)
 SYSCALL(sys_setns,sys_setns,sys_setns_wrapper)
+SYSCALL(sys_process_vm_readv,sys_process_vm_readv,compat_sys_process_vm_readv_wrapper) /* 340 */
+SYSCALL(sys_process_vm_writev,sys_process_vm_writev,compat_sys_process_vm_writev_wrapper)
diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c
index 77b8942b9a15..fdb5b8cb260f 100644
--- a/arch/s390/kernel/topology.c
+++ b/arch/s390/kernel/topology.c
@@ -68,8 +68,10 @@ static cpumask_t cpu_group_map(struct mask_info *info, unsigned int cpu)
        return mask;
 }
-static void add_cpus_to_mask(struct topology_cpu *tl_cpu,
+static struct mask_info *add_cpus_to_mask(struct topology_cpu *tl_cpu,
-                             struct mask_info *book, struct mask_info *core)
+                                          struct mask_info *book,
+                                          struct mask_info *core,
+                                          int z10)
 {
        unsigned int cpu;
@@ -88,10 +90,16 @@ static void add_cpus_to_mask(struct topology_cpu *tl_cpu,
                        cpu_book_id[lcpu] = book->id;
 #endif
                        cpumask_set_cpu(lcpu, &core->mask);
-                        cpu_core_id[lcpu] = core->id;
+                        if (z10) {
+                                cpu_core_id[lcpu] = rcpu;
+                                core = core->next;
+                        } else {
+                                cpu_core_id[lcpu] = core->id;
+                        }
                        smp_cpu_polarization[lcpu] = tl_cpu->pp;
                }
        }
+        return core;
 }
 static void clear_masks(void)
@@ -123,18 +131,41 @@ static void tl_to_cores(struct sysinfo_15_1_x *info)
 {
 #ifdef CONFIG_SCHED_BOOK
        struct mask_info *book = &book_info;
+        struct cpuid cpu_id;
 #else
        struct mask_info *book = NULL;
 #endif
        struct mask_info *core = &core_info;
        union topology_entry *tle, *end;
+        int z10 = 0;
+#ifdef CONFIG_SCHED_BOOK
+        get_cpu_id(&cpu_id);
+        z10 = cpu_id.machine == 0x2097 || cpu_id.machine == 0x2098;
+#endif
        spin_lock_irq(&topology_lock);
        clear_masks();
        tle = info->tle;
        end = (union topology_entry *)((unsigned long)info + info->length);
        while (tle < end) {
+#ifdef CONFIG_SCHED_BOOK
+                if (z10) {
+                        switch (tle->nl) {
+                        case 1:
+                                book = book->next;
+                                book->id = tle->container.id;
+                                break;
+                        case 0:
+                                core = add_cpus_to_mask(&tle->cpu, book, core, z10);
+                                break;
+                        default:
+                                clear_masks();
+                                goto out;
+                        }
+                        tle = next_tle(tle);
+                        continue;
+                }
+#endif
                switch (tle->nl) {
 #ifdef CONFIG_SCHED_BOOK
                case 2:
@@ -147,7 +178,7 @@ static void tl_to_cores(struct sysinfo_15_1_x *info)
                        core->id = tle->container.id;
                        break;
                case 0:
-                        add_cpus_to_mask(&tle->cpu, book, core);
+                        add_cpus_to_mask(&tle->cpu, book, core, z10);
                        break;
                default:
                        clear_masks();
@@ -328,8 +359,8 @@ void __init s390_init_cpu_topology(void)
        for (i = 0; i < TOPOLOGY_NR_MAG; i++)
                printk(" %d", info->mag[i]);
        printk(" / %d\n", info->mnest);
-        alloc_masks(info, &core_info, 2);
+        alloc_masks(info, &core_info, 1);
 #ifdef CONFIG_SCHED_BOOK
-        alloc_masks(info, &book_info, 3);
+        alloc_masks(info, &book_info, 2);
 #endif
 }
diff --git a/arch/s390/kernel/vmlinux.lds.S b/arch/s390/kernel/vmlinux.lds.S
index 56fe6bc81fee..e4c79ebb40e6 100644
--- a/arch/s390/kernel/vmlinux.lds.S
+++ b/arch/s390/kernel/vmlinux.lds.S
@@ -43,6 +43,8 @@ SECTIONS
        NOTES :text :note
+        .dummy : { *(.dummy) } :data
        RODATA
 #ifdef CONFIG_SHARED_KERNEL
diff --git a/arch/s390/kvm/diag.c b/arch/s390/kvm/diag.c
index 87cedd61be04..8943e82cd4d9 100644
--- a/arch/s390/kvm/diag.c
+++ b/arch/s390/kvm/diag.c
@@ -70,7 +70,7 @@ static int __diag_ipl_functions(struct kvm_vcpu *vcpu)
                return -EOPNOTSUPP;
        }
-        atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
+        atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
        vcpu->run->s390_reset_flags |= KVM_S390_RESET_SUBSYSTEM;
        vcpu->run->s390_reset_flags |= KVM_S390_RESET_IPL;
        vcpu->run->s390_reset_flags |= KVM_S390_RESET_CPU_INIT;
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index c7c51898984e..02434543eabb 100644
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -132,7 +132,6 @@ static int handle_stop(struct kvm_vcpu *vcpu)
        int rc = 0;
        vcpu->stat.exit_stop_request++;
-        atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
        spin_lock_bh(&vcpu->arch.local_int.lock);
        if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) {
                vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP;
@@ -149,6 +148,8 @@ static int handle_stop(struct kvm_vcpu *vcpu)
        }
        if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) {
+                atomic_set_mask(CPUSTAT_STOPPED,
+                                &vcpu->arch.sie_block->cpuflags);
                vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP;
                VCPU_EVENT(vcpu, 3, "%s", "cpu stopped");
                rc = -EOPNOTSUPP;
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 87c16705b381..278ee009ce65 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -252,6 +252,7 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
                        offsetof(struct _lowcore, restart_psw), sizeof(psw_t));
                if (rc == -EFAULT)
                        exception = 1;
+                atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
                break;
        case KVM_S390_PROGRAM_INT:
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 0bd3bea1e4cd..d1c445732451 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -65,6 +65,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
        { "instruction_stfl", VCPU_STAT(instruction_stfl) },
        { "instruction_tprot", VCPU_STAT(instruction_tprot) },
        { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) },
+        { "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) },
        { "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) },
        { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) },
        { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
@@ -127,6 +128,7 @@ int kvm_dev_ioctl_check_extension(long ext)
        switch (ext) {
        case KVM_CAP_S390_PSW:
        case KVM_CAP_S390_GMAP:
+        case KVM_CAP_SYNC_MMU:
                r = 1;
                break;
        default:
@@ -270,10 +272,12 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
        restore_fp_regs(&vcpu->arch.guest_fpregs);
        restore_access_regs(vcpu->arch.guest_acrs);
        gmap_enable(vcpu->arch.gmap);
+        atomic_set_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
 }
 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 {
+        atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
        gmap_disable(vcpu->arch.gmap);
        save_fp_regs(&vcpu->arch.guest_fpregs);
        save_access_regs(vcpu->arch.guest_acrs);
@@ -301,7 +305,9 @@ static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 {
-        atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH | CPUSTAT_SM);
+        atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
+                                                    CPUSTAT_SM |
+                                                    CPUSTAT_STOPPED);
        vcpu->arch.sie_block->ecb   = 6;
        vcpu->arch.sie_block->eca   = 0xC1002001U;
        vcpu->arch.sie_block->fac   = (int) (long) facilities;
@@ -428,7 +434,7 @@ static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
 {
        int rc = 0;
-        if (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_RUNNING)
+        if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_STOPPED))
                rc = -EBUSY;
        else {
                vcpu->run->psw_mask = psw.mask;
@@ -501,7 +507,7 @@ rerun_vcpu:
        if (vcpu->sigset_active)
                sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
-        atomic_set_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
+        atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
        BUG_ON(vcpu->kvm->arch.float_int.local_int[vcpu->vcpu_id] == NULL);
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 391626361084..d02638959922 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -336,6 +336,7 @@ static int handle_tprot(struct kvm_vcpu *vcpu)
        u64 address1 = disp1 + base1 ? vcpu->arch.guest_gprs[base1] : 0;
        u64 address2 = disp2 + base2 ? vcpu->arch.guest_gprs[base2] : 0;
        struct vm_area_struct *vma;
+        unsigned long user_address;
        vcpu->stat.instruction_tprot++;
@@ -349,9 +350,14 @@ static int handle_tprot(struct kvm_vcpu *vcpu)
                return -EOPNOTSUPP;
+        /* we must resolve the address without holding the mmap semaphore.
+         * This is ok since the userspace hypervisor is not supposed to change
+         * the mapping while the guest queries the memory. Otherwise the guest
+         * might crash or get wrong info anyway. */
+        user_address = (unsigned long) __guestaddr_to_user(vcpu, address1);
        down_read(&current->mm->mmap_sem);
-        vma = find_vma(current->mm,
+        vma = find_vma(current->mm, user_address);
-                        (unsigned long) __guestaddr_to_user(vcpu, address1));
        if (!vma) {
                up_read(&current->mm->mmap_sem);
                return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c
index f815118835f3..0a7941d74bc6 100644
--- a/arch/s390/kvm/sigp.c
+++ b/arch/s390/kvm/sigp.c
@@ -31,9 +31,11 @@
 #define SIGP_SET_PREFIX        0x0d
 #define SIGP_STORE_STATUS_ADDR 0x0e
 #define SIGP_SET_ARCH          0x12
+#define SIGP_SENSE_RUNNING     0x15
 /* cpu status bits */
 #define SIGP_STAT_EQUIPMENT_CHECK   0x80000000UL
+#define SIGP_STAT_NOT_RUNNING       0x00000400UL
 #define SIGP_STAT_INCORRECT_STATE   0x00000200UL
 #define SIGP_STAT_INVALID_PARAMETER 0x00000100UL
 #define SIGP_STAT_EXT_CALL_PENDING  0x00000080UL
@@ -57,8 +59,8 @@ static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
        spin_lock(&fi->lock);
        if (fi->local_int[cpu_addr] == NULL)
                rc = 3; /* not operational */
-        else if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
+        else if (!(atomic_read(fi->local_int[cpu_addr]->cpuflags)
-                 & CPUSTAT_RUNNING) {
+                  & CPUSTAT_STOPPED)) {
                *reg &= 0xffffffff00000000UL;
                rc = 1; /* status stored */
        } else {
@@ -251,7 +253,7 @@ static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
        spin_lock_bh(&li->lock);
        /* cpu must be in stopped state */
-        if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
+        if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
                rc = 1; /* incorrect state */
                *reg &= SIGP_STAT_INCORRECT_STATE;
                kfree(inti);
@@ -275,6 +277,38 @@ out_fi:
        return rc;
 }
+static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
+                                unsigned long *reg)
+{
+        int rc;
+        struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
+        if (cpu_addr >= KVM_MAX_VCPUS)
+                return 3; /* not operational */
+        spin_lock(&fi->lock);
+        if (fi->local_int[cpu_addr] == NULL)
+                rc = 3; /* not operational */
+        else {
+                if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
+                    & CPUSTAT_RUNNING) {
+                        /* running */
+                        rc = 1;
+                } else {
+                        /* not running */
+                        *reg &= 0xffffffff00000000UL;
+                        *reg |= SIGP_STAT_NOT_RUNNING;
+                        rc = 0;
+                }
+        }
+        spin_unlock(&fi->lock);
+        VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr,
+                   rc);
+        return rc;
+}
 int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
 {
        int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
@@ -331,6 +365,11 @@ int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
                rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
                                       &vcpu->arch.guest_gprs[r1]);
                break;
+        case SIGP_SENSE_RUNNING:
+                vcpu->stat.instruction_sigp_sense_running++;
+                rc = __sigp_sense_running(vcpu, cpu_addr,
+                                          &vcpu->arch.guest_gprs[r1]);
+                break;
        case SIGP_RESTART:
                vcpu->stat.instruction_sigp_restart++;
                /* user space must know about restart */
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 1766def5bc3f..a9a301866b3c 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -587,8 +587,13 @@ static void pfault_interrupt(unsigned int ext_int_code,
                } else {
                        /* Completion interrupt was faster than initial
                         * interrupt. Set pfault_wait to -1 so the initial
-                         * interrupt doesn't put the task to sleep. */
+                         * interrupt doesn't put the task to sleep.
-                        tsk->thread.pfault_wait = -1;
+                         * If the task is not running, ignore the completion
+                         * interrupt since it must be a leftover of a PFAULT
+                         * CANCEL operation which didn't remove all pending
+                         * completion interrupts. */
+                        if (tsk->state == TASK_RUNNING)
+                                tsk->thread.pfault_wait = -1;
                }
                put_task_struct(tsk);
        } else {