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2017-08-29s390/dasd: Add discard support for FBA devicesJan Höppner1-1/+5
The z/VM hypervisor provides virtual disks (VDISK) which are backed by main memory of the hypervisor. Those devices are seen as DASD FBA disks within the Linux guest. Whenever data is written to such a device, memory is allocated on-the-fly by z/VM accordingly. This memory, however, is not being freed if data on the device is deleted by the guest OS. In order to make memory usable after deletion again, add discard support to the FBA discipline. While at it, update comments regarding the DASD_FEATURE_* flags. Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-08-29s390/mm: use generic mm_hooksMartin Schwidefsky1-26/+1
With git commit 3446c13b268af86391d06611327006b059b8bab1 "s390/mm: four page table levels vs. fork" s390 dropped its architecture specific version of arch_dup_mmap. Now all functions defined by include/asm-generic/mm_hooks.h are identical to the s390 versions. Use the generic header. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-08-29KVM: s390: expose no-DAT to guest and migration supportClaudio Imbrenda1-1/+1
The STFLE bit 147 indicates whether the ESSA no-DAT operation code is valid, the bit is not normally provided to the host; the host is instead provided with an SCLP bit that indicates whether guests can support the feature. This patch: * enables the STFLE bit in the guest if the corresponding SCLP bit is present in the host. * adds support for migrating the no-DAT bit in the PGSTEs * fixes the software interpretation of the ESSA instruction that is used when migrating, both for the new operation code and for the old "set stable", as per specifications. Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2017-08-29KVM: s390: Multiple Epoch Facility supportCollin L. Walling2-1/+11
Allow for the enablement of MEF and the support for the extended epoch in SIE and VSIE for the extended guest TOD-Clock. A new interface is used for getting/setting a guest's extended TOD-Clock that uses a single ioctl invocation, KVM_S390_VM_TOD_EXT. Since the host time is a moving target that might see an epoch switch or STP sync checks we need an atomic ioctl and cannot use the exisiting two interfaces. The old method of getting and setting the guest TOD-Clock is still retained and is used when the old ioctls are called. Signed-off-by: Collin L. Walling <walling@linux.vnet.ibm.com> Reviewed-by: Janosch Frank <frankja@linux.vnet.ibm.com> Reviewed-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com> Reviewed-by: Jason J. Herne <jjherne@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2017-08-25futex: Remove duplicated code and fix undefined behaviourJiri Slaby1-18/+5
There is code duplicated over all architecture's headers for futex_atomic_op_inuser. Namely op decoding, access_ok check for uaddr, and comparison of the result. Remove this duplication and leave up to the arches only the needed assembly which is now in arch_futex_atomic_op_inuser. This effectively distributes the Will Deacon's arm64 fix for undefined behaviour reported by UBSAN to all architectures. The fix was done in commit 5f16a046f8e1 (arm64: futex: Fix undefined behaviour with FUTEX_OP_OPARG_SHIFT usage). Look there for an example dump. And as suggested by Thomas, check for negative oparg too, because it was also reported to cause undefined behaviour report. Note that s390 removed access_ok check in d12a29703 ("s390/uaccess: remove pointless access_ok() checks") as access_ok there returns true. We introduce it back to the helper for the sake of simplicity (it gets optimized away anyway). Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Russell King <rmk+kernel@armlinux.org.uk> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> [s390] Acked-by: Chris Metcalf <cmetcalf@mellanox.com> [for tile] Reviewed-by: Darren Hart (VMware) <dvhart@infradead.org> Reviewed-by: Will Deacon <will.deacon@arm.com> [core/arm64] Cc: linux-mips@linux-mips.org Cc: Rich Felker <dalias@libc.org> Cc: linux-ia64@vger.kernel.org Cc: linux-sh@vger.kernel.org Cc: peterz@infradead.org Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: sparclinux@vger.kernel.org Cc: Jonas Bonn <jonas@southpole.se> Cc: linux-s390@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: linux-hexagon@vger.kernel.org Cc: Helge Deller <deller@gmx.de> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Matt Turner <mattst88@gmail.com> Cc: linux-snps-arc@lists.infradead.org Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: linux-xtensa@linux-xtensa.org Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> Cc: openrisc@lists.librecores.org Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Stafford Horne <shorne@gmail.com> Cc: linux-arm-kernel@lists.infradead.org Cc: Richard Henderson <rth@twiddle.net> Cc: Chris Zankel <chris@zankel.net> Cc: Michal Simek <monstr@monstr.eu> Cc: Tony Luck <tony.luck@intel.com> Cc: linux-parisc@vger.kernel.org Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: linux-alpha@vger.kernel.org Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: linuxppc-dev@lists.ozlabs.org Cc: "David S. Miller" <davem@davemloft.net> Link: http://lkml.kernel.org/r/20170824073105.3901-1-jslaby@suse.cz
2017-08-23s390/topology: Remove the unused parent_node() macroDou Liyang1-6/+0
Commit a7be6e5a7f8d ("mm: drop useless local parameters of __register_one_node()") removes the last user of parent_node(). The parent_node() macro in S390 platform is unnecessary. Remove it for cleanup. Reported-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-08-23s390/dasd: Change unsigned long long to unsigned longJan Höppner1-1/+1
Unsigned long long and unsigned long were different in size for 31-bit. For 64-bit the size for both datatypes is 8 Bytes and since the support for 31-bit is long gone we can clean up a little and change everything to unsigned long. Change get_phys_clock() along the way to accept unsigned long as well so that the DASD code can be consistent. Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-08-21Merge branch 'for-mingo' of ↵Ingo Molnar1-7/+0
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu Pull RCU updates from Paul E. McKenney: - Removal of spin_unlock_wait() - SRCU updates - Torture-test updates - Documentation updates - Miscellaneous fixes - CPU-hotplug fixes - Miscellaneous non-RCU fixes Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-08-17arch: Remove spin_unlock_wait() arch-specific definitionsPaul E. McKenney1-7/+0
There is no agreed-upon definition of spin_unlock_wait()'s semantics, and it appears that all callers could do just as well with a lock/unlock pair. This commit therefore removes the underlying arch-specific arch_spin_unlock_wait() for all architectures providing them. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: <linux-arch@vger.kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Andrea Parri <parri.andrea@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Boqun Feng <boqun.feng@gmail.com>
2017-08-16Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller1-6/+11
2017-08-15iommu/s390: Add support for iommu_device handlingJoerg Roedel1-0/+7
Add support for the iommu_device_register interface to make the s390 hardware iommus visible to the iommu core and in sysfs. Acked-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-08-11mm: fix MADV_[FREE|DONTNEED] TLB flush miss problemMinchan Kim1-1/+6
Nadav reported parallel MADV_DONTNEED on same range has a stale TLB problem and Mel fixed it[1] and found same problem on MADV_FREE[2]. Quote from Mel Gorman: "The race in question is CPU 0 running madv_free and updating some PTEs while CPU 1 is also running madv_free and looking at the same PTEs. CPU 1 may have writable TLB entries for a page but fail the pte_dirty check (because CPU 0 has updated it already) and potentially fail to flush. Hence, when madv_free on CPU 1 returns, there are still potentially writable TLB entries and the underlying PTE is still present so that a subsequent write does not necessarily propagate the dirty bit to the underlying PTE any more. Reclaim at some unknown time at the future may then see that the PTE is still clean and discard the page even though a write has happened in the meantime. I think this is possible but I could have missed some protection in madv_free that prevents it happening." This patch aims for solving both problems all at once and is ready for other problem with KSM, MADV_FREE and soft-dirty story[3]. TLB batch API(tlb_[gather|finish]_mmu] uses [inc|dec]_tlb_flush_pending and mmu_tlb_flush_pending so that when tlb_finish_mmu is called, we can catch there are parallel threads going on. In that case, forcefully, flush TLB to prevent for user to access memory via stale TLB entry although it fail to gather page table entry. I confirmed this patch works with [4] test program Nadav gave so this patch supersedes "mm: Always flush VMA ranges affected by zap_page_range v2" in current mmotm. NOTE: This patch modifies arch-specific TLB gathering interface(x86, ia64, s390, sh, um). It seems most of architecture are straightforward but s390 need to be careful because tlb_flush_mmu works only if mm->context.flush_mm is set to non-zero which happens only a pte entry really is cleared by ptep_get_and_clear and friends. However, this problem never changes the pte entries but need to flush to prevent memory access from stale tlb. [1] http://lkml.kernel.org/r/20170725101230.5v7gvnjmcnkzzql3@techsingularity.net [2] http://lkml.kernel.org/r/20170725100722.2dxnmgypmwnrfawp@suse.de [3] http://lkml.kernel.org/r/BD3A0EBE-ECF4-41D4-87FA-C755EA9AB6BD@gmail.com [4] https://patchwork.kernel.org/patch/9861621/ [minchan@kernel.org: decrease tlb flush pending count in tlb_finish_mmu] Link: http://lkml.kernel.org/r/20170808080821.GA31730@bbox Link: http://lkml.kernel.org/r/20170802000818.4760-7-namit@vmware.com Signed-off-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Nadav Amit <namit@vmware.com> Reported-by: Nadav Amit <namit@vmware.com> Reported-by: Mel Gorman <mgorman@techsingularity.net> Acked-by: Mel Gorman <mgorman@techsingularity.net> Cc: Ingo Molnar <mingo@redhat.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Tony Luck <tony.luck@intel.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Jeff Dike <jdike@addtoit.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Hugh Dickins <hughd@google.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Nadav Amit <nadav.amit@gmail.com> Cc: Rik van Riel <riel@redhat.com> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-08-11mm: refactor TLB gathering APIMinchan Kim1-6/+6
This patch is a preparatory patch for solving race problems caused by TLB batch. For that, we will increase/decrease TLB flush pending count of mm_struct whenever tlb_[gather|finish]_mmu is called. Before making it simple, this patch separates architecture specific part and rename it to arch_tlb_[gather|finish]_mmu and generic part just calls it. It shouldn't change any behavior. Link: http://lkml.kernel.org/r/20170802000818.4760-5-namit@vmware.com Signed-off-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Nadav Amit <namit@vmware.com> Acked-by: Mel Gorman <mgorman@techsingularity.net> Cc: Ingo Molnar <mingo@redhat.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Tony Luck <tony.luck@intel.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Jeff Dike <jdike@addtoit.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Hugh Dickins <hughd@google.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Nadav Amit <nadav.amit@gmail.com> Cc: Rik van Riel <riel@redhat.com> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-08-09s390/vmcp: split vmcp header file and move to uapiHeiko Carstens1-0/+24
Split the vmcp header file and move the device driver internal structure to the C file, and move the ioctl definitions to the uapi directory. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-08-09s390/vmcp: make use of contiguous memory allocatorHeiko Carstens1-0/+6
If memory is fragmented it is unlikely that large order memory allocations succeed. This has been an issue with the vmcp device driver since a long time, since it requires large physical contiguous memory ares for large responses. To hopefully resolve this issue make use of the contiguous memory allocator (cma). This patch adds a vmcp specific vmcp cma area with a default size of 4MB. The size can be changed either via the VMCP_CMA_SIZE config option at compile time or with the "vmcp_cma" kernel parameter (e.g. "vmcp_cma=16m"). For any vmcp response buffers larger than 16k memory from the cma area will be allocated. If such an allocation fails, there is a fallback to the buddy allocator. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-08-09s390/cpcmd,vmcp: avoid GFP_DMA allocationsHeiko Carstens1-4/+3
According to the CP Programming Services manual Diagnose Code 8 "Virtual Console Function" can be used in all addressing modes. Also the input and output buffers do not have a limitation which specifies they need to be below the 2GB line. This is true at least since z/VM 5.4. Therefore remove the sam31/64 instructions and allow for simple GFP_KERNEL allocations. This makes it easier to allocate a 1MB page if the user requested such a large return buffer. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-08-09s390/mm: add missing virt_to_pfn() etc. helper functionsHeiko Carstens1-7/+17
Add all the missing little helper functions like virt_to_pfn(), phys_to_page(), etc. While we had a couple of these helper functions like e.g. page_to_phys() the other functions were missing, which is quite annoying if one is looking for exactly such a function. Therefore finally add all those little helper functions. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-08-04sock: add SOCK_ZEROCOPY sockoptWillem de Bruijn1-0/+2
The send call ignores unknown flags. Legacy applications may already unwittingly pass MSG_ZEROCOPY. Continue to ignore this flag unless a socket opts in to zerocopy. Introduce socket option SO_ZEROCOPY to enable MSG_ZEROCOPY processing. Processes can also query this socket option to detect kernel support for the feature. Older kernels will return ENOPROTOOPT. Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-08-03s390: use generic asm/unaligned.hHeiko Carstens2-13/+1
And another header file for which we can use the generic variant, even though it doesn't look obvious at first glance. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-08-03s390: use generic uapi/asm/swab.hHeiko Carstens2-89/+1
clang doesn't like s390 specific inline assembler constraints. These are present in our arch specific uapi/asm/swab.h which again is required by some ebpf test cases. For current compiler versions the generic swab.h already makes use of gcc's builtin functions. Therefore we can simply remove our own header file and use the generic one. This will generate worse code if used with compilers before gcc 4.8, which has no __builtin_bswap16(); or before gcc v4.4, which has no __builtin_bswap[32|64](). For these cases a C implementation fallback would be used which generates more code, but is still correct (170KB extra code for gcc 4.3 with performance_defconfig). However given that we need (and want) to get rid of the inline assemblies anyway in order to be able to use clang, the above is just a minor drawback if old gcc compilers are used. With current compilers there is close to zero difference, except for three btrfs bit functions which generate more out-of-line code. The generated code looks still correct and also uses the s390 specific byteswap instructions. Reported-and-tested-by: Thomas Richter <tmricht@linux.vnet.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-08-02s390: remove asm/mman.h and asm/types.hHeiko Carstens3-25/+1
Both header files only include the corresponding uapi header file and therefore can be removed. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-08-02s390/nmi: keep comments consistentHeiko Carstens1-1/+1
The name of bit 36 of the machine check interruption code is "guarded storage registers validity". Add the missing "validity" part in order to be consistent with all other comments, which include this piece of information. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-07-26s390/spinlock: add niai spinlock hintsMartin Schwidefsky1-4/+5
The z14 machine introduces new mode of the next-instruction-access-intent NIAI instruction. With NIAI-8 it is possible to pin a cache-line on a CPU for a small amount of time, NIAI-7 releases the cache-line again. Finally NIAI-4 can be used to prevent the CPU to speculatively access memory beyond the compare-and-swap instruction to get the lock. Use these instruction in the spinlock code. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-07-26s390/time: add support for the TOD clock epoch extensionMartin Schwidefsky3-28/+60
The TOD epoch extension adds 8 epoch bits to the TOD clock to provide a continuous clock after 2042/09/17. The store-clock-extended (STCKE) instruction will store the epoch index in the first byte of the 16 bytes stored by the instruction. The read_boot_clock64 and the read_presistent_clock64 functions need to take the additional bits into account to give the correct result after 2042/09/17. The clock-comparator register will stay 64 bit wide. The comparison of the clock-comparator with the TOD clock is limited to bytes 1 to 8 of the extended TOD format. To deal with the overflow problem due to an epoch change the clock-comparator sign control in CR0 can be used to switch the comparison of the 64-bit TOD clock with the clock-comparator to a signed comparison. The decision between the signed vs. unsigned clock-comparator comparisons is done at boot time. Only if the TOD clock is in the second half of a 142 year epoch the signed comparison is used. This solves the epoch overflow issue as long as the machine is booted at least once in an epoch. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-07-26s390/mm,vmem: simplify region and segment table allocation codeHeiko Carstens2-3/+4
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Reviewed-by: Janosch Frank <frankja@linux.vnet.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-07-26s390/mm: use new mm defines instead of magic valuesHeiko Carstens6-15/+15
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-07-26s390/mm: introduce defines to reflect the hardware mmuHeiko Carstens3-23/+57
Add various defines like e.g. _REGION1_SHIFT to reflect the hardware mmu. We have quite a bit code that does not make use of the Linux memory management primitives but directly modifies page, segment and region values. Most of this is open-coded like e.g. "1UL << 53". In order to clean this up introduce a couple of new defines. The existing Linux memory management defines are changed, so the mapping to the hardware implementation is reflected. Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-07-26s390/mm: get rid of __ASSEMBLY__ guards within pgtable.hHeiko Carstens1-5/+0
We have C code also outside of #ifndef __ASSEMBLY__. So these guards seem to be quite pointless and can be removed. Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-07-26s390/mm: remove and correct comments within pgtable.hHeiko Carstens1-27/+4
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-07-25s390/mm,kvm: use nodat PGSTE tag to optimize TLB flushingMartin Schwidefsky1-0/+1
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-07-25s390/mm: add guest ASCE TLB flush optimizationMartin Schwidefsky2-15/+45
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-07-25s390/mm: add no-dat TLB flush optimizationMartin Schwidefsky3-15/+37
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-07-25s390/mm: tag normal pages vs pages used in page tablesMartin Schwidefsky3-1/+6
The ESSA instruction has a new option that allows to tag pages that are not used as a page table. Without the tag the hypervisor has to assume that any guest page could be used in a page table inside the guest. This forces the hypervisor to flush all guest TLB entries whenever a host page table entry is invalidated. With the tag the host can skip the TLB flush if the page is tagged as normal page. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-07-21Merge branch 'core-urgent-for-linus' of ↵Linus Torvalds1-2/+2
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull core fixes from Ingo Molnar: "A fix to WARN_ON_ONCE() done by modules, plus a MAINTAINERS update" * 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: debug: Fix WARN_ON_ONCE() for modules MAINTAINERS: Update the PTRACE entry
2017-07-20debug: Fix WARN_ON_ONCE() for modulesJosh Poimboeuf1-2/+2
Mike Galbraith reported a situation where a WARN_ON_ONCE() call in DRM code turned into an oops. As it turns out, WARN_ON_ONCE() seems to be completely broken when called from a module. The bug was introduced with the following commit: 19d436268dde ("debug: Add _ONCE() logic to report_bug()") That commit changed WARN_ON_ONCE() to move its 'once' logic into the bug trap handler. It requires a writable bug table so that the BUGFLAG_DONE bit can be written to the flags to indicate the first warning has occurred. The bug table was made writable for vmlinux, which relies on vmlinux.lds.S and vmlinux.lds.h for laying out the sections. However, it wasn't made writable for modules, which rely on the ELF section header flags. Reported-by: Mike Galbraith <efault@gmx.de> Tested-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes: 19d436268dde ("debug: Add _ONCE() logic to report_bug()") Link: http://lkml.kernel.org/r/a53b04235a65478dd9afc51f5b329fdc65c84364.1500095401.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-07-15Merge branch 'work.uaccess-unaligned' of ↵Linus Torvalds1-3/+0
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull uacess-unaligned removal from Al Viro: "That stuff had just one user, and an exotic one, at that - binfmt_flat on arm and m68k" * 'work.uaccess-unaligned' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: kill {__,}{get,put}_user_unaligned() binfmt_flat: flat_{get,put}_addr_from_rp() should be able to fail
2017-07-11s390: reduce ELF_ET_DYN_BASEKees Cook1-8/+7
Now that explicitly executed loaders are loaded in the mmap region, we have more freedom to decide where we position PIE binaries in the address space to avoid possible collisions with mmap or stack regions. For 64-bit, align to 4GB to allow runtimes to use the entire 32-bit address space for 32-bit pointers. On 32-bit use 4MB, which is the traditional x86 minimum load location, likely to avoid historically requiring a 4MB page table entry when only a portion of the first 4MB would be used (since the NULL address is avoided). For s390 the position could be 0x10000, but that is needlessly close to the NULL address. Link: http://lkml.kernel.org/r/1498154792-49952-5-git-send-email-keescook@chromium.org Signed-off-by: Kees Cook <keescook@chromium.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: Pratyush Anand <panand@redhat.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-07-07Merge branch 'akpm' (patches from Andrew)Linus Torvalds1-1/+4
Merge misc updates from Andrew Morton: - a few hotfixes - various misc updates - ocfs2 updates - most of MM * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (108 commits) mm, memory_hotplug: move movable_node to the hotplug proper mm, memory_hotplug: drop CONFIG_MOVABLE_NODE mm, memory_hotplug: drop artificial restriction on online/offline mm: memcontrol: account slab stats per lruvec mm: memcontrol: per-lruvec stats infrastructure mm: memcontrol: use generic mod_memcg_page_state for kmem pages mm: memcontrol: use the node-native slab memory counters mm: vmstat: move slab statistics from zone to node counters mm/zswap.c: delete an error message for a failed memory allocation in zswap_dstmem_prepare() mm/zswap.c: improve a size determination in zswap_frontswap_init() mm/zswap.c: delete an error message for a failed memory allocation in zswap_pool_create() mm/swapfile.c: sort swap entries before free mm/oom_kill: count global and memory cgroup oom kills mm: per-cgroup memory reclaim stats mm: kmemleak: treat vm_struct as alternative reference to vmalloc'ed objects mm: kmemleak: factor object reference updating out of scan_block() mm: kmemleak: slightly reduce the size of some structures on 64-bit architectures mm, mempolicy: don't check cpuset seqlock where it doesn't matter mm, cpuset: always use seqlock when changing task's nodemask mm, mempolicy: simplify rebinding mempolicies when updating cpusets ...
2017-07-07Merge branch 'uaccess.strlen' of ↵Linus Torvalds1-17/+0
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull user access str* updates from Al Viro: "uaccess str...() dead code removal" * 'uaccess.strlen' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: s390 keyboard.c: don't open-code strndup_user() mips: get rid of unused __strnlen_user() get rid of unused __strncpy_from_user() instances kill strlen_user()
2017-07-07Merge branch 'misc.compat' of ↵Linus Torvalds1-1/+0
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull misc compat stuff updates from Al Viro: "This part is basically untangling various compat stuff. Compat syscalls moved to their native counterparts, getting rid of quite a bit of double-copying and/or set_fs() uses. A lot of field-by-field copyin/copyout killed off. - kernel/compat.c is much closer to containing just the copyin/copyout of compat structs. Not all compat syscalls are gone from it yet, but it's getting there. - ipc/compat_mq.c killed off completely. - block/compat_ioctl.c cleaned up; floppy compat ioctls moved to drivers/block/floppy.c where they belong. Yes, there are several drivers that implement some of the same ioctls. Some are m68k and one is 32bit-only pmac. drivers/block/floppy.c is the only one in that bunch that can be built on biarch" * 'misc.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: mqueue: move compat syscalls to native ones usbdevfs: get rid of field-by-field copyin compat_hdio_ioctl: get rid of set_fs() take floppy compat ioctls to sodding floppy.c ipmi: get rid of field-by-field __get_user() ipmi: get COMPAT_IPMICTL_RECEIVE_MSG in sync with the native one rt_sigtimedwait(): move compat to native select: switch compat_{get,put}_fd_set() to compat_{get,put}_bitmap() put_compat_rusage(): switch to copy_to_user() sigpending(): move compat to native getrlimit()/setrlimit(): move compat to native times(2): move compat to native compat_{get,put}_bitmap(): use unsafe_{get,put}_user() fb_get_fscreeninfo(): don't bother with do_fb_ioctl() do_sigaltstack(): lift copying to/from userland into callers take compat_sys_old_getrlimit() to native syscall trim __ARCH_WANT_SYS_OLD_GETRLIMIT
2017-07-07Merge tag 'dma-mapping-4.13' of git://git.infradead.org/users/hch/dma-mappingLinus Torvalds1-2/+0
Pull dma-mapping infrastructure from Christoph Hellwig: "This is the first pull request for the new dma-mapping subsystem In this new subsystem we'll try to properly maintain all the generic code related to dma-mapping, and will further consolidate arch code into common helpers. This pull request contains: - removal of the DMA_ERROR_CODE macro, replacing it with calls to ->mapping_error so that the dma_map_ops instances are more self contained and can be shared across architectures (me) - removal of the ->set_dma_mask method, which duplicates the ->dma_capable one in terms of functionality, but requires more duplicate code. - various updates for the coherent dma pool and related arm code (Vladimir) - various smaller cleanups (me)" * tag 'dma-mapping-4.13' of git://git.infradead.org/users/hch/dma-mapping: (56 commits) ARM: dma-mapping: Remove traces of NOMMU code ARM: NOMMU: Set ARM_DMA_MEM_BUFFERABLE for M-class cpus ARM: NOMMU: Introduce dma operations for noMMU drivers: dma-mapping: allow dma_common_mmap() for NOMMU drivers: dma-coherent: Introduce default DMA pool drivers: dma-coherent: Account dma_pfn_offset when used with device tree dma: Take into account dma_pfn_offset dma-mapping: replace dmam_alloc_noncoherent with dmam_alloc_attrs dma-mapping: remove dmam_free_noncoherent crypto: qat - avoid an uninitialized variable warning au1100fb: remove a bogus dma_free_nonconsistent call MAINTAINERS: add entry for dma mapping helpers powerpc: merge __dma_set_mask into dma_set_mask dma-mapping: remove the set_dma_mask method powerpc/cell: use the dma_supported method for ops switching powerpc/cell: clean up fixed mapping dma_ops initialization tile: remove dma_supported and mapping_error methods xen-swiotlb: remove xen_swiotlb_set_dma_mask arm: implement ->dma_supported instead of ->set_dma_mask mips/loongson64: implement ->dma_supported instead of ->set_dma_mask ...
2017-07-07Merge branch 'for-linus' of ↵Linus Torvalds2-18/+6
git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull more s390 updates from Martin Schwidefsky: - The fixup for the blk-mq clash with the scm driver - An improvement for the dasd driver in regard to raw I/O - Bug fixes and cleanup * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: Update my email address s390/syscalls: Fix out of bounds arguments access s390/vfio_ccw: remove unused variable s390/dasd: remove unneeded code s390/crash: Remove unused KEXEC_NOTE_BYTES s390/zcrypt: Fix missing newlines at some debug feature messages. s390/dasd: Make raw I/O usable without prefix support s390/dasd: Rename dasd_raw_build_cp() s390/dasd: Refactor prefix_LRE() and related functions s390: fix up for "blk-mq: switch ->queue_rq return value to blk_status_t"
2017-07-07Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds4-13/+42
Pull KVM updates from Paolo Bonzini: "PPC: - Better machine check handling for HV KVM - Ability to support guests with threads=2, 4 or 8 on POWER9 - Fix for a race that could cause delayed recognition of signals - Fix for a bug where POWER9 guests could sleep with interrupts pending. ARM: - VCPU request overhaul - allow timer and PMU to have their interrupt number selected from userspace - workaround for Cavium erratum 30115 - handling of memory poisonning - the usual crop of fixes and cleanups s390: - initial machine check forwarding - migration support for the CMMA page hinting information - cleanups and fixes x86: - nested VMX bugfixes and improvements - more reliable NMI window detection on AMD - APIC timer optimizations Generic: - VCPU request overhaul + documentation of common code patterns - kvm_stat improvements" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (124 commits) Update my email address kvm: vmx: allow host to access guest MSR_IA32_BNDCFGS x86: kvm: mmu: use ept a/d in vmcs02 iff used in vmcs12 kvm: x86: mmu: allow A/D bits to be disabled in an mmu x86: kvm: mmu: make spte mmio mask more explicit x86: kvm: mmu: dead code thanks to access tracking KVM: PPC: Book3S: Fix typo in XICS-on-XIVE state saving code KVM: PPC: Book3S HV: Close race with testing for signals on guest entry KVM: PPC: Book3S HV: Simplify dynamic micro-threading code KVM: x86: remove ignored type attribute KVM: LAPIC: Fix lapic timer injection delay KVM: lapic: reorganize restart_apic_timer KVM: lapic: reorganize start_hv_timer kvm: nVMX: Check memory operand to INVVPID KVM: s390: Inject machine check into the nested guest KVM: s390: Inject machine check into the guest tools/kvm_stat: add new interactive command 'b' tools/kvm_stat: add new command line switch '-i' tools/kvm_stat: fix error on interactive command 'g' KVM: SVM: suppress unnecessary NMI singlestep on GIF=0 and nested exit ...
2017-07-07mm/hugetlb: allow architectures to override huge_pte_clear()Punit Agrawal1-1/+1
When unmapping a hugepage range, huge_pte_clear() is used to clear the page table entries that are marked as not present. huge_pte_clear() internally just ends up calling pte_clear() which does not correctly deal with hugepages consisting of contiguous page table entries. Add a size argument to address this issue and allow architectures to override huge_pte_clear() by wrapping it in a #ifndef block. Update s390 implementation with the size parameter as well. Note that the change only affects huge_pte_clear() - the other generic hugetlb functions don't need any change. Link: http://lkml.kernel.org/r/20170522162555.4313-1-punit.agrawal@arm.com Signed-off-by: Punit Agrawal <punit.agrawal@arm.com> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> [s390 bits] Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Steve Capper <steve.capper@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Hillf Danton <hillf.zj@alibaba-inc.com> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-07-07mm/hugetlb: clean up ARCH_HAS_GIGANTIC_PAGEAneesh Kumar K.V1-0/+3
This moves the #ifdef in C code to a Kconfig dependency. Also we move the gigantic_page_supported() function to be arch specific. This allows architectures to conditionally enable runtime allocation of gigantic huge page. Architectures like ppc64 supports different gigantic huge page size (16G and 1G) based on the translation mode selected. This provides an opportunity for ppc64 to enable runtime allocation only w.r.t 1G hugepage. No functional change in this patch. Link: http://lkml.kernel.org/r/1494995292-4443-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-07-05Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-nextLinus Torvalds2-0/+30
Pull networking updates from David Miller: "Reasonably busy this cycle, but perhaps not as busy as in the 4.12 merge window: 1) Several optimizations for UDP processing under high load from Paolo Abeni. 2) Support pacing internally in TCP when using the sch_fq packet scheduler for this is not practical. From Eric Dumazet. 3) Support mutliple filter chains per qdisc, from Jiri Pirko. 4) Move to 1ms TCP timestamp clock, from Eric Dumazet. 5) Add batch dequeueing to vhost_net, from Jason Wang. 6) Flesh out more completely SCTP checksum offload support, from Davide Caratti. 7) More plumbing of extended netlink ACKs, from David Ahern, Pablo Neira Ayuso, and Matthias Schiffer. 8) Add devlink support to nfp driver, from Simon Horman. 9) Add RTM_F_FIB_MATCH flag to RTM_GETROUTE queries, from Roopa Prabhu. 10) Add stack depth tracking to BPF verifier and use this information in the various eBPF JITs. From Alexei Starovoitov. 11) Support XDP on qed device VFs, from Yuval Mintz. 12) Introduce BPF PROG ID for better introspection of installed BPF programs. From Martin KaFai Lau. 13) Add bpf_set_hash helper for TC bpf programs, from Daniel Borkmann. 14) For loads, allow narrower accesses in bpf verifier checking, from Yonghong Song. 15) Support MIPS in the BPF selftests and samples infrastructure, the MIPS eBPF JIT will be merged in via the MIPS GIT tree. From David Daney. 16) Support kernel based TLS, from Dave Watson and others. 17) Remove completely DST garbage collection, from Wei Wang. 18) Allow installing TCP MD5 rules using prefixes, from Ivan Delalande. 19) Add XDP support to Intel i40e driver, from Björn Töpel 20) Add support for TC flower offload in nfp driver, from Simon Horman, Pieter Jansen van Vuuren, Benjamin LaHaise, Jakub Kicinski, and Bert van Leeuwen. 21) IPSEC offloading support in mlx5, from Ilan Tayari. 22) Add HW PTP support to macb driver, from Rafal Ozieblo. 23) Networking refcount_t conversions, From Elena Reshetova. 24) Add sock_ops support to BPF, from Lawrence Brako. This is useful for tuning the TCP sockopt settings of a group of applications, currently via CGROUPs" * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1899 commits) net: phy: dp83867: add workaround for incorrect RX_CTRL pin strap dt-bindings: phy: dp83867: provide a workaround for incorrect RX_CTRL pin strap cxgb4: Support for get_ts_info ethtool method cxgb4: Add PTP Hardware Clock (PHC) support cxgb4: time stamping interface for PTP nfp: default to chained metadata prepend format nfp: remove legacy MAC address lookup nfp: improve order of interfaces in breakout mode net: macb: remove extraneous return when MACB_EXT_DESC is defined bpf: add missing break in for the TCP_BPF_SNDCWND_CLAMP case bpf: fix return in load_bpf_file mpls: fix rtm policy in mpls_getroute net, ax25: convert ax25_cb.refcount from atomic_t to refcount_t net, ax25: convert ax25_route.refcount from atomic_t to refcount_t net, ax25: convert ax25_uid_assoc.refcount from atomic_t to refcount_t net, sctp: convert sctp_ep_common.refcnt from atomic_t to refcount_t net, sctp: convert sctp_transport.refcnt from atomic_t to refcount_t net, sctp: convert sctp_chunk.refcnt from atomic_t to refcount_t net, sctp: convert sctp_datamsg.refcnt from atomic_t to refcount_t net, sctp: convert sctp_auth_bytes.refcnt from atomic_t to refcount_t ...
2017-07-05s390/syscalls: Fix out of bounds arguments accessJiri Olsa1-0/+6
Zorro reported following crash while having enabled syscall tracing (CONFIG_FTRACE_SYSCALLS): Unable to handle kernel pointer dereference at virtual ... Oops: 0011 [#1] SMP DEBUG_PAGEALLOC SNIP Call Trace: ([<000000000024d79c>] ftrace_syscall_enter+0xec/0x1d8) [<00000000001099c6>] do_syscall_trace_enter+0x236/0x2f8 [<0000000000730f1c>] sysc_tracesys+0x1a/0x32 [<000003fffcf946a2>] 0x3fffcf946a2 INFO: lockdep is turned off. Last Breaking-Event-Address: [<000000000022dd44>] rb_event_data+0x34/0x40 ---[ end trace 8c795f86b1b3f7b9 ]--- The crash happens in syscall_get_arguments function for syscalls with zero arguments, that will try to access first argument (args[0]) in event entry, but it's not allocated. Bail out of there are no arguments. Cc: stable@vger.kernel.org Reported-by: Zorro Lang <zlang@redhat.com> Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-07-05s390/crash: Remove unused KEXEC_NOTE_BYTESMichael Holzheu1-18/+0
After commmit 692f66f26a4c19 ("crash: move crashkernel parsing and vmcore related code under CONFIG_CRASH_CORE") the KEXEC_NOTE_BYTES macro is not used anymore and for s390 we create the ELF header in the new kernel anyway. Therefore remove the macro. Reported-by: Xunlei Pang <xpang@redhat.com> Reviewed-by: Mikhail Zaslonko <zaslonko@linux.vnet.ibm.com> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2017-07-04kill {__,}{get,put}_user_unaligned()Al Viro1-3/+0
no users left Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-07-04Merge branch 'for-linus' of ↵Linus Torvalds18-86/+230
git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 updates from Martin Schwidefsky: "The bulk of the s390 patches for 4.13. Some new things but mostly bug fixes and cleanups. Noteworthy changes: - The SCM block driver is converted to blk-mq - Switch s390 to 5 level page tables. The virtual address space for a user space process can now have up to 16EB-4KB. - Introduce a ELF phdr flag for qemu to avoid the global vm.alloc_pgste which forces all processes to large page tables - A couple of PCI improvements to improve error recovery - Included is the merge of the base support for proper machine checks for KVM" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (52 commits) s390/dasd: Fix faulty ENODEV for RO sysfs attribute s390/pci: recognize name clashes with uids s390/pci: provide more debug information s390/pci: fix handling of PEC 306 s390/pci: improve pci hotplug s390/pci: introduce clp_get_state s390/pci: improve error handling during fmb (de)registration s390/pci: improve unreg_ioat error handling s390/pci: improve error handling during interrupt deregistration s390/pci: don't cleanup in arch_setup_msi_irqs KVM: s390: Backup the guest's machine check info s390/nmi: s390: New low level handling for machine check happening in guest s390/fpu: export save_fpu_regs for all configs s390/kvm: avoid global config of vm.alloc_pgste=1 s390: rename struct psw_bits members s390: rename psw_bits enums s390/mm: use correct address space when enabling DAT s390/cio: introduce io_subchannel_type s390/ipl: revert Load Normal semantics for LPAR CCW-type re-IPL s390/dumpstack: remove raw stack dump ...
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