From e7c95effcd3a7a0c9535c809141ca499fede2c31 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Tue, 28 Feb 2017 07:05:59 +0100 Subject: s390/crypt: fix missing unlock in ctr_paes_crypt on error path The ctr mode of protected key aes uses the ctrblk page if the ctrblk_lock could be acquired. If the protected key has to be reestablished and this operation fails the unlock for the ctrblk_lock is missing. Add it. Signed-off-by: Martin Schwidefsky --- arch/s390/crypto/paes_s390.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'arch') diff --git a/arch/s390/crypto/paes_s390.c b/arch/s390/crypto/paes_s390.c index d69ea495c4d7..716b17238599 100644 --- a/arch/s390/crypto/paes_s390.c +++ b/arch/s390/crypto/paes_s390.c @@ -474,8 +474,11 @@ static int ctr_paes_crypt(struct blkcipher_desc *desc, unsigned long modifier, ret = blkcipher_walk_done(desc, walk, nbytes - n); } if (k < n) { - if (__ctr_paes_set_key(ctx) != 0) + if (__ctr_paes_set_key(ctx) != 0) { + if (locked) + spin_unlock(&ctrblk_lock); return blkcipher_walk_done(desc, walk, -EIO); + } } } if (locked) -- cgit v1.2.3-58-ga151 From d9fcf2a1cbd1ff65d0109b1b400938808007fcd5 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Tue, 28 Feb 2017 07:42:01 +0100 Subject: s390: fix in-kernel program checks A program check inside the kernel takes a slightly different path in entry.S compare to a normal user fault. A recent change moved the store of the breaking event address into the path taken for in-kernel program checks as well, but %r14 has not been setup to point to the correct location. A wild store is the consequence. Move the store of the breaking event address to the code path for user space faults. Fixes: 34525e1f7e8d ("s390: store breaking event address only for program checks") Reported-by: Michael Holzheu Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/entry.S | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'arch') diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index dff2152350a7..6a7d737d514c 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -490,7 +490,7 @@ ENTRY(pgm_check_handler) jnz .Lpgm_svcper # -> single stepped svc 1: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) - j 3f + j 4f 2: UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER lg %r15,__LC_KERNEL_STACK lgr %r14,%r12 @@ -499,8 +499,8 @@ ENTRY(pgm_check_handler) tm __LC_PGM_ILC+2,0x02 # check for transaction abort jz 3f mvc __THREAD_trap_tdb(256,%r14),0(%r13) -3: la %r11,STACK_FRAME_OVERHEAD(%r15) - stg %r10,__THREAD_last_break(%r14) +3: stg %r10,__THREAD_last_break(%r14) +4: la %r11,STACK_FRAME_OVERHEAD(%r15) stmg %r0,%r7,__PT_R0(%r11) mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC stmg %r8,%r9,__PT_PSW(%r11) @@ -509,14 +509,14 @@ ENTRY(pgm_check_handler) xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) stg %r10,__PT_ARGS(%r11) tm __LC_PGM_ILC+3,0x80 # check for per exception - jz 4f + jz 5f tmhh %r8,0x0001 # kernel per event ? jz .Lpgm_kprobe oi __PT_FLAGS+7(%r11),_PIF_PER_TRAP mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS mvc __THREAD_per_cause(2,%r14),__LC_PER_CODE mvc __THREAD_per_paid(1,%r14),__LC_PER_ACCESS_ID -4: REENABLE_IRQS +5: REENABLE_IRQS xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) larl %r1,pgm_check_table llgh %r10,__PT_INT_CODE+2(%r11) -- cgit v1.2.3-58-ga151 From e69ca822ce0ed3ba006ce384d7d205c81d92373f Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Wed, 1 Mar 2017 09:16:03 +0100 Subject: s390/cputime: remove last traces of cputime_t The cputime_t type is a thing of the past, replace the last occurences of the type in the s390 code with a simple u64. Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/cputime.h | 14 ++------------ arch/s390/kernel/vtime.c | 2 +- 2 files changed, 3 insertions(+), 13 deletions(-) (limited to 'arch') diff --git a/arch/s390/include/asm/cputime.h b/arch/s390/include/asm/cputime.h index d1c407ddf703..e5672d6276a6 100644 --- a/arch/s390/include/asm/cputime.h +++ b/arch/s390/include/asm/cputime.h @@ -8,32 +8,22 @@ #define _S390_CPUTIME_H #include -#include #define CPUTIME_PER_USEC 4096ULL #define CPUTIME_PER_SEC (CPUTIME_PER_USEC * USEC_PER_SEC) /* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */ -typedef unsigned long long __nocast cputime_t; -typedef unsigned long long __nocast cputime64_t; - #define cmpxchg_cputime(ptr, old, new) cmpxchg64(ptr, old, new) -static inline unsigned long __div(unsigned long long n, unsigned long base) -{ - return n / base; -} - /* * Convert cputime to microseconds and back. */ -static inline unsigned int cputime_to_usecs(const cputime_t cputime) +static inline u64 cputime_to_usecs(const u64 cputime) { - return (__force unsigned long long) cputime >> 12; + return cputime >> 12; } - u64 arch_cpu_idle_time(int cpu); #define arch_idle_time(cpu) arch_cpu_idle_time(cpu) diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c index 31bd96e81167..8f5f59a151b4 100644 --- a/arch/s390/kernel/vtime.c +++ b/arch/s390/kernel/vtime.c @@ -111,7 +111,7 @@ static inline u64 scale_vtime(u64 vtime) } static void account_system_index_scaled(struct task_struct *p, - cputime_t cputime, cputime_t scaled, + u64 cputime, u64 scaled, enum cpu_usage_stat index) { p->stimescaled += cputime_to_nsecs(scaled); -- cgit v1.2.3-58-ga151 From 3c915bdc1775acfa214195da1ffb39dabdd1a389 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Wed, 1 Mar 2017 09:18:34 +0100 Subject: s390/cputime: reset all accounting fields on fork copy_thread has to reset all cputime related field in the task struct, not only user_timer and system_timer. Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/process.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch') diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c index 54281660582c..249deafaa6ee 100644 --- a/arch/s390/kernel/process.c +++ b/arch/s390/kernel/process.c @@ -121,7 +121,10 @@ int copy_thread_tls(unsigned long clone_flags, unsigned long new_stackp, clear_tsk_thread_flag(p, TIF_SINGLE_STEP); /* Initialize per thread user and system timer values */ p->thread.user_timer = 0; + p->thread.guest_timer = 0; p->thread.system_timer = 0; + p->thread.hardirq_timer = 0; + p->thread.softirq_timer = 0; frame->sf.back_chain = 0; /* new return point is ret_from_fork */ -- cgit v1.2.3-58-ga151 From e53051e757d6cd66741955b93581e54415e48a70 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Wed, 1 Mar 2017 09:21:10 +0100 Subject: s390/cputime: provide archicture specific cputime_to_nsecs The generic cputime_to_nsecs function first converts the cputime to micro-seconds and then multiplies the result with 1000. This looses some bits of accuracy, provide our own version of cputime_to_nsecs that does not loose precision. Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/cputime.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'arch') diff --git a/arch/s390/include/asm/cputime.h b/arch/s390/include/asm/cputime.h index e5672d6276a6..9072bf63a846 100644 --- a/arch/s390/include/asm/cputime.h +++ b/arch/s390/include/asm/cputime.h @@ -8,6 +8,7 @@ #define _S390_CPUTIME_H #include +#include #define CPUTIME_PER_USEC 4096ULL #define CPUTIME_PER_SEC (CPUTIME_PER_USEC * USEC_PER_SEC) @@ -17,13 +18,18 @@ #define cmpxchg_cputime(ptr, old, new) cmpxchg64(ptr, old, new) /* - * Convert cputime to microseconds and back. + * Convert cputime to microseconds. */ static inline u64 cputime_to_usecs(const u64 cputime) { return cputime >> 12; } +/* + * Convert cputime to nanoseconds. + */ +#define cputime_to_nsecs(cputime) tod_to_ns(cputime) + u64 arch_cpu_idle_time(int cpu); #define arch_idle_time(cpu) arch_cpu_idle_time(cpu) -- cgit v1.2.3-58-ga151 From d03bd0454b101adb94d0b5a9cc11396182943cb4 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Wed, 1 Mar 2017 09:47:57 +0100 Subject: s390/timex: micro optimization for tod_to_ns The conversion of a TOD value to nano-seconds currently uses a 32/32 bit split with the calculation for "nsecs = (TOD * 125) >> 9". Using a 55/9 bit split saves an instruction. Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/timex.h | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) (limited to 'arch') diff --git a/arch/s390/include/asm/timex.h b/arch/s390/include/asm/timex.h index 354344dcc198..118535123f34 100644 --- a/arch/s390/include/asm/timex.h +++ b/arch/s390/include/asm/timex.h @@ -206,20 +206,16 @@ static inline unsigned long long get_tod_clock_monotonic(void) * ns = (todval * 125) >> 9; * * In order to avoid an overflow with the multiplication we can rewrite this. - * With a split todval == 2^32 * th + tl (th upper 32 bits, tl lower 32 bits) + * With a split todval == 2^9 * th + tl (th upper 55 bits, tl lower 9 bits) * we end up with * - * ns = ((2^32 * th + tl) * 125 ) >> 9; - * -> ns = (2^23 * th * 125) + ((tl * 125) >> 9); + * ns = ((2^9 * th + tl) * 125 ) >> 9; + * -> ns = (th * 125) + ((tl * 125) >> 9); * */ static inline unsigned long long tod_to_ns(unsigned long long todval) { - unsigned long long ns; - - ns = ((todval >> 32) << 23) * 125; - ns += ((todval & 0xffffffff) * 125) >> 9; - return ns; + return ((todval >> 9) * 125) + (((todval & 0x1ff) * 125) >> 9); } #endif -- cgit v1.2.3-58-ga151 From 7afbeb6df2aa5f9e3a0fc228817a85c16dea0faa Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Fri, 24 Feb 2017 12:56:12 +0100 Subject: s390/ipl: always use load normal for CCW-type re-IPL commit 14890678687c ("s390/ipl: use load normal for LPAR re-ipl") missed to convert one code path to use load normal semantics for re-IPL. Convert the missing code path as well. Fixes: 14890678687c ("s390/ipl: use load normal for LPAR re-ipl") Reported-by: Michael Holzheu Acked-by: Michael Holzheu Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/ipl.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch') diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c index b67dafb7b7cf..e545ffe5155a 100644 --- a/arch/s390/kernel/ipl.c +++ b/arch/s390/kernel/ipl.c @@ -564,6 +564,8 @@ static struct kset *ipl_kset; static void __ipl_run(void *unused) { + if (MACHINE_IS_LPAR && ipl_info.type == IPL_TYPE_CCW) + diag308(DIAG308_LOAD_NORMAL_DUMP, NULL); diag308(DIAG308_LOAD_CLEAR, NULL); if (MACHINE_IS_VM) __cpcmd("IPL", NULL, 0, NULL); -- cgit v1.2.3-58-ga151 From 2e4d88009f57057df7672fa69a32b5224af54d37 Mon Sep 17 00:00:00 2001 From: Janosch Frank Date: Thu, 2 Mar 2017 15:23:42 +0100 Subject: KVM: s390: Fix guest migration for huge guests resulting in panic While we can technically not run huge page guests right now, we can setup a guest with huge pages. Trying to migrate it will trigger a VM_BUG_ON and, if the kernel is not configured to panic on a BUG, it will happily try to work on non-existing page table entries. With this patch, we always return "dirty" if we encounter a large page when migrating. This at least fixes the immediate problem until we have proper handling for both kind of pages. Fixes: 15f36eb ("KVM: s390: Add proper dirty bitmap support to S390 kvm.") Cc: # 3.16+ Signed-off-by: Janosch Frank Acked-by: Christian Borntraeger Signed-off-by: Martin Schwidefsky --- arch/s390/mm/pgtable.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) (limited to 'arch') diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index b48dc5f1900b..463e5ef02304 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -608,12 +608,29 @@ void ptep_zap_key(struct mm_struct *mm, unsigned long addr, pte_t *ptep) bool test_and_clear_guest_dirty(struct mm_struct *mm, unsigned long addr) { spinlock_t *ptl; + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; pgste_t pgste; pte_t *ptep; pte_t pte; bool dirty; - ptep = get_locked_pte(mm, addr, &ptl); + pgd = pgd_offset(mm, addr); + pud = pud_alloc(mm, pgd, addr); + if (!pud) + return false; + pmd = pmd_alloc(mm, pud, addr); + if (!pmd) + return false; + /* We can't run guests backed by huge pages, but userspace can + * still set them up and then try to migrate them without any + * migration support. + */ + if (pmd_large(*pmd)) + return true; + + ptep = pte_alloc_map_lock(mm, pmd, addr, &ptl); if (unlikely(!ptep)) return false; -- cgit v1.2.3-58-ga151 From 8bd49ac86677ca43d64f08c45864e438283d6a76 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Mon, 6 Mar 2017 09:57:17 +0100 Subject: s390: wire up statx system call Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/include/uapi/asm/unistd.h | 4 +++- arch/s390/kernel/compat_wrapper.c | 1 + arch/s390/kernel/syscalls.S | 2 ++ 3 files changed, 6 insertions(+), 1 deletion(-) (limited to 'arch') diff --git a/arch/s390/include/uapi/asm/unistd.h b/arch/s390/include/uapi/asm/unistd.h index 4384bc797a54..152de9b796e1 100644 --- a/arch/s390/include/uapi/asm/unistd.h +++ b/arch/s390/include/uapi/asm/unistd.h @@ -313,7 +313,9 @@ #define __NR_copy_file_range 375 #define __NR_preadv2 376 #define __NR_pwritev2 377 -#define NR_syscalls 378 +/* Number 378 is reserved for guarded storage */ +#define __NR_statx 379 +#define NR_syscalls 380 /* * There are some system calls that are not present on 64 bit, some diff --git a/arch/s390/kernel/compat_wrapper.c b/arch/s390/kernel/compat_wrapper.c index ae2cda5eee5a..e89cc2e71db1 100644 --- a/arch/s390/kernel/compat_wrapper.c +++ b/arch/s390/kernel/compat_wrapper.c @@ -178,3 +178,4 @@ COMPAT_SYSCALL_WRAP3(getpeername, int, fd, struct sockaddr __user *, usockaddr, COMPAT_SYSCALL_WRAP6(sendto, int, fd, void __user *, buff, size_t, len, unsigned int, flags, struct sockaddr __user *, addr, int, addr_len); COMPAT_SYSCALL_WRAP3(mlock2, unsigned long, start, size_t, len, int, flags); COMPAT_SYSCALL_WRAP6(copy_file_range, int, fd_in, loff_t __user *, off_in, int, fd_out, loff_t __user *, off_out, size_t, len, unsigned int, flags); +COMPAT_SYSCALL_WRAP5(statx, int, dfd, const char __user *, path, unsigned, flags, unsigned, mask, struct statx __user *, buffer); diff --git a/arch/s390/kernel/syscalls.S b/arch/s390/kernel/syscalls.S index 9b59e6212d8f..2659b5cfeddb 100644 --- a/arch/s390/kernel/syscalls.S +++ b/arch/s390/kernel/syscalls.S @@ -386,3 +386,5 @@ SYSCALL(sys_mlock2,compat_sys_mlock2) SYSCALL(sys_copy_file_range,compat_sys_copy_file_range) /* 375 */ SYSCALL(sys_preadv2,compat_sys_preadv2) SYSCALL(sys_pwritev2,compat_sys_pwritev2) +NI_SYSCALL +SYSCALL(sys_statx,compat_sys_statx) -- cgit v1.2.3-58-ga151