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2021-06-24KVM: stats: Separate generic stats from architecture specific onesJing Zhang1-7/+2
Generic KVM stats are those collected in architecture independent code or those supported by all architectures; put all generic statistics in a separate structure. This ensures that they are defined the same way in the statistics API which is being added, removing duplication among different architectures in the declaration of the descriptors. No functional change intended. Reviewed-by: David Matlack <dmatlack@google.com> Reviewed-by: Ricardo Koller <ricarkol@google.com> Reviewed-by: Krish Sadhukhan <krish.sadhukhan@oracle.com> Signed-off-by: Jing Zhang <jingzhangos@google.com> Message-Id: <20210618222709.1858088-2-jingzhangos@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-05-07Merge branch 'akpm' (patches from Andrew)Linus Torvalds1-5/+0
Merge yet more updates from Andrew Morton: "This is everything else from -mm for this merge window. 90 patches. Subsystems affected by this patch series: mm (cleanups and slub), alpha, procfs, sysctl, misc, core-kernel, bitmap, lib, compat, checkpatch, epoll, isofs, nilfs2, hpfs, exit, fork, kexec, gcov, panic, delayacct, gdb, resource, selftests, async, initramfs, ipc, drivers/char, and spelling" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (90 commits) mm: fix typos in comments mm: fix typos in comments treewide: remove editor modelines and cruft ipc/sem.c: spelling fix fs: fat: fix spelling typo of values kernel/sys.c: fix typo kernel/up.c: fix typo kernel/user_namespace.c: fix typos kernel/umh.c: fix some spelling mistakes include/linux/pgtable.h: few spelling fixes mm/slab.c: fix spelling mistake "disired" -> "desired" scripts/spelling.txt: add "overflw" scripts/spelling.txt: Add "diabled" typo scripts/spelling.txt: add "overlfow" arm: print alloc free paths for address in registers mm/vmalloc: remove vwrite() mm: remove xlate_dev_kmem_ptr() drivers/char: remove /dev/kmem for good mm: fix some typos and code style problems ipc/sem.c: mundane typo fixes ...
2021-05-07mm: remove xlate_dev_kmem_ptr()David Hildenbrand1-5/+0
Since /dev/kmem has been removed, let's remove the xlate_dev_kmem_ptr() leftovers. Link: https://lkml.kernel.org/r/20210324102351.6932-3-david@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Brian Cain <bcain@codeaurora.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Helge Deller <deller@gmx.de> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Rich Felker <dalias@libc.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Arnd Bergmann <arnd@arndb.de> Cc: David Hildenbrand <david@redhat.com> Cc: Krzysztof Kozlowski <krzk@kernel.org> Cc: Mikulas Patocka <mpatocka@redhat.com> Cc: Luc Van Oostenryck <luc.vanoostenryck@gmail.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Palmer Dabbelt <palmerdabbelt@google.com> Cc: Luis Chamberlain <mcgrof@kernel.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Jiaxun Yang <jiaxun.yang@flygoat.com> Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Cc: Niklas Schnelle <schnelle@linux.ibm.com> Cc: Pierre Morel <pmorel@linux.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-05-06Merge tag 's390-5.13-2' of ↵Linus Torvalds3-1/+13
git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull more s390 updates from Heiko Carstens: - add support for system call stack randomization - handle stale PCI deconfiguration events - couple of defconfig updates - some fixes and cleanups * tag 's390-5.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390: fix detection of vector enhancements facility 1 vs. vector packed decimal facility s390/entry: add support for syscall stack randomization s390/configs: change CONFIG_VIRTIO_CONSOLE to "m" s390/cio: remove invalid condition on IO_SCH_UNREG s390/cpumf: remove call to perf_event_update_userpage s390/cpumf: move counter set size calculation to common place s390/cpumf: beautify if-then-else indentation s390/configs: enable CONFIG_PCI_IOV s390/pci: handle stale deconfiguration events s390/pci: rename zpci_configure_device()
2021-05-01Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds2-0/+6
Pull kvm updates from Paolo Bonzini: "This is a large update by KVM standards, including AMD PSP (Platform Security Processor, aka "AMD Secure Technology") and ARM CoreSight (debug and trace) changes. ARM: - CoreSight: Add support for ETE and TRBE - Stage-2 isolation for the host kernel when running in protected mode - Guest SVE support when running in nVHE mode - Force W^X hypervisor mappings in nVHE mode - ITS save/restore for guests using direct injection with GICv4.1 - nVHE panics now produce readable backtraces - Guest support for PTP using the ptp_kvm driver - Performance improvements in the S2 fault handler x86: - AMD PSP driver changes - Optimizations and cleanup of nested SVM code - AMD: Support for virtual SPEC_CTRL - Optimizations of the new MMU code: fast invalidation, zap under read lock, enable/disably dirty page logging under read lock - /dev/kvm API for AMD SEV live migration (guest API coming soon) - support SEV virtual machines sharing the same encryption context - support SGX in virtual machines - add a few more statistics - improved directed yield heuristics - Lots and lots of cleanups Generic: - Rework of MMU notifier interface, simplifying and optimizing the architecture-specific code - a handful of "Get rid of oprofile leftovers" patches - Some selftests improvements" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (379 commits) KVM: selftests: Speed up set_memory_region_test selftests: kvm: Fix the check of return value KVM: x86: Take advantage of kvm_arch_dy_has_pending_interrupt() KVM: SVM: Skip SEV cache flush if no ASIDs have been used KVM: SVM: Remove an unnecessary prototype declaration of sev_flush_asids() KVM: SVM: Drop redundant svm_sev_enabled() helper KVM: SVM: Move SEV VMCB tracking allocation to sev.c KVM: SVM: Explicitly check max SEV ASID during sev_hardware_setup() KVM: SVM: Unconditionally invoke sev_hardware_teardown() KVM: SVM: Enable SEV/SEV-ES functionality by default (when supported) KVM: SVM: Condition sev_enabled and sev_es_enabled on CONFIG_KVM_AMD_SEV=y KVM: SVM: Append "_enabled" to module-scoped SEV/SEV-ES control variables KVM: SEV: Mask CPUID[0x8000001F].eax according to supported features KVM: SVM: Move SEV module params/variables to sev.c KVM: SVM: Disable SEV/SEV-ES if NPT is disabled KVM: SVM: Free sev_asid_bitmap during init if SEV setup fails KVM: SVM: Zero out the VMCB array used to track SEV ASID association x86/sev: Drop redundant and potentially misleading 'sev_enabled' KVM: x86: Move reverse CPUID helpers to separate header file KVM: x86: Rename GPR accessors to make mode-aware variants the defaults ...
2021-04-30Merge tag 'powerpc-5.13-1' of ↵Linus Torvalds1-1/+2
git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc updates from Michael Ellerman: - Enable KFENCE for 32-bit. - Implement EBPF for 32-bit. - Convert 32-bit to do interrupt entry/exit in C. - Convert 64-bit BookE to do interrupt entry/exit in C. - Changes to our signal handling code to use user_access_begin/end() more extensively. - Add support for time namespaces (CONFIG_TIME_NS) - A series of fixes that allow us to reenable STRICT_KERNEL_RWX. - Other smaller features, fixes & cleanups. Thanks to Alexey Kardashevskiy, Andreas Schwab, Andrew Donnellan, Aneesh Kumar K.V, Athira Rajeev, Bhaskar Chowdhury, Bixuan Cui, Cédric Le Goater, Chen Huang, Chris Packham, Christophe Leroy, Christopher M. Riedl, Colin Ian King, Dan Carpenter, Daniel Axtens, Daniel Henrique Barboza, David Gibson, Davidlohr Bueso, Denis Efremov, dingsenjie, Dmitry Safonov, Dominic DeMarco, Fabiano Rosas, Ganesh Goudar, Geert Uytterhoeven, Geetika Moolchandani, Greg Kurz, Guenter Roeck, Haren Myneni, He Ying, Jiapeng Chong, Jordan Niethe, Laurent Dufour, Lee Jones, Leonardo Bras, Li Huafei, Madhavan Srinivasan, Mahesh Salgaonkar, Masahiro Yamada, Nathan Chancellor, Nathan Lynch, Nicholas Piggin, Oliver O'Halloran, Paul Menzel, Pu Lehui, Randy Dunlap, Ravi Bangoria, Rosen Penev, Russell Currey, Santosh Sivaraj, Sebastian Andrzej Siewior, Segher Boessenkool, Shivaprasad G Bhat, Srikar Dronamraju, Stephen Rothwell, Thadeu Lima de Souza Cascardo, Thomas Gleixner, Tony Ambardar, Tyrel Datwyler, Vaibhav Jain, Vincenzo Frascino, Xiongwei Song, Yang Li, Yu Kuai, and Zhang Yunkai. * tag 'powerpc-5.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (302 commits) powerpc/signal32: Fix erroneous SIGSEGV on RT signal return powerpc: Avoid clang uninitialized warning in __get_user_size_allowed powerpc/papr_scm: Mark nvdimm as unarmed if needed during probe powerpc/kvm: Fix build error when PPC_MEM_KEYS/PPC_PSERIES=n powerpc/kasan: Fix shadow start address with modules powerpc/kernel/iommu: Use largepool as a last resort when !largealloc powerpc/kernel/iommu: Align size for IOMMU_PAGE_SIZE() to save TCEs powerpc/44x: fix spelling mistake in Kconfig "varients" -> "variants" powerpc/iommu: Annotate nested lock for lockdep powerpc/iommu: Do not immediately panic when failed IOMMU table allocation powerpc/iommu: Allocate it_map by vmalloc selftests/powerpc: remove unneeded semicolon powerpc/64s: remove unneeded semicolon powerpc/eeh: remove unneeded semicolon powerpc/selftests: Add selftest to test concurrent perf/ptrace events powerpc/selftests/perf-hwbreak: Add testcases for 2nd DAWR powerpc/selftests/perf-hwbreak: Coalesce event creation code powerpc/selftests/ptrace-hwbreak: Add testcases for 2nd DAWR powerpc/configs: Add IBMVNIC to some 64-bit configs selftests/powerpc: Add uaccess flush test ...
2021-04-30s390/entry: add support for syscall stack randomizationSven Schnelle1-0/+10
This adds support for adding a random offset to the stack while handling syscalls. The patch uses get_tod_clock_fast() as this is considered good enough and has much less performance penalty compared to using get_random_int(). The patch also adds randomization in pgm_check_handler() as the sigreturn/rt_sigreturn system calls might be called from there. Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Link: https://lore.kernel.org/r/20210429091451.1062594-1-svens@linux.ibm.com Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-30s390/cpumf: move counter set size calculation to common placeThomas Richter1-0/+2
The function to calculate the size of counter sets is renamed from cf_diag_ctrset_size() to cpum_cf_ctrset_size() and moved to the file containing common functions for the CPU Measurement Counter Facility. No functional change. Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Acked-by : Sumanth Korikkar <sumanthk@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-30s390/pci: rename zpci_configure_device()Niklas Schnelle1-1/+1
With zpci_configure_device() now always called on a device that has already been configured on the platform level its name has become misleading. Rename it to zpci_scan_configured_device() to signify that the function now only handles the correct scanning of a newly configured PCI function taking care of the special handling necessary for function 0 and functions parked waiting for a PCI bus that can't be created without first seeing function 0. Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Reviewed-by: Pierre Morel <pmorel@linux.ibm.com> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-22Merge branch 'kvm-sev-cgroup' into HEADPaolo Bonzini2-2/+2
2021-04-18s390/atomic,cmpxchg: always inline __xchg/__cmpxchgHeiko Carstens1-3/+5
Make sure to always inline __xchg() and __cmpxchg() otherwise the compiler might decide to generate out-of-line versions which will fail at link time: s390-linux-ld: lib/atomic64_test.o: in function `__xchg': >> atomic64_test.c:(.text.unlikely+0xa4): undefined reference to `__xchg_called_with_bad_pointer' Reported-by: kernel test robot <lkp@intel.com> Link: https://lore.kernel.org/linux-mm/202104170449.SIIFKVjT-lkp@intel.com/ Fixes: d2b1f6d2d350 ("s390/cmpxchg: get rid of gcc atomic builtins") Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-17KVM: s390x: implement KVM_CAP_SET_GUEST_DEBUG2Maxim Levitsky1-0/+4
Define KVM_GUESTDBG_VALID_MASK and use it to implement this capabiity. Compile tested only. Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com> Message-Id: <20210401135451.1004564-6-mlevitsk@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-04-15Merge tag 'kvm-s390-next-5.13-1' of ↵Paolo Bonzini2-0/+2
git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD KVM: s390: Updates for 5.13 - properly handle MVPG in nesting KVM (vsie) - allow to forward the yield_to hypercall (diagnose 9c) - fixes
2021-04-15s390/atomic,cmpxchg: make constraints work with old compilersHeiko Carstens2-9/+9
Old gcc versions may fail with an internal compiler error if only the T or S constraint is specified for an operand, and no displacement is needed at all. To fix this use RT and QS as constraints, which reflects the union of both. Later gcc versions do the right thing and always accept single T and S constraints. See gcc commit 3e4be43f69da ("S/390: Memory constraint cleanup"). Fixes: ca897bb1814f ("s390/atomic: use proper constraints") Fixes: b23eb636d7f9 ("s390/atomic: get rid of gcc atomic builtins") Fixes: d2b1f6d2d350 ("s390/cmpxchg: get rid of gcc atomic builtins") Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-15s390/cmpxchg: use unsigned long values instead of void pointersHeiko Carstens1-26/+23
gcc and clang warn about incompatible pointer types due to the recent cmpxchg changes: drivers/gpu/drm/drm_lock.c:75:10: error: passing 'typeof (lock)' (aka 'volatile unsigned int *') to parameter of type 'void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers] prev = cmpxchg(lock, old, new); ^~~~~~~~~~~~~~~~~~~~~~~ include/asm-generic/atomic-instrumented.h:1685:2: note: expanded from macro 'cmpxchg' arch_cmpxchg(__ai_ptr, __VA_ARGS__); \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ To avoid this simply cast pointers to unsigned long and use them instead of void pointers. This allows to stay with functions, instead of using complex defines and having to deal with all their potential side effects. Reported-by: kernel test robot <lkp@intel.com> Fixes: d2b1f6d2d350 ("s390/cmpxchg: get rid of gcc atomic builtins") Link: https://lore.kernel.org/linux-s390/202104130131.sMmSqpb5-lkp@intel.com/ Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-14lib/vdso: Add vdso_data pointer as input to __arch_get_timens_vdso_data()Christophe Leroy1-1/+2
For the same reason as commit e876f0b69dc9 ("lib/vdso: Allow architectures to provide the vdso data pointer"), powerpc wants to avoid calculation of relative position to code. As the timens_vdso_data is next page to vdso_data, provide vdso_data pointer to __arch_get_timens_vdso_data() in order to ease the calculation on powerpc in following patches. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Acked-by: Andrei Vagin <avagin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/539c4204b1baa77c55f758904a1ea239abbc7a5c.1617209142.git.christophe.leroy@csgroup.eu
2021-04-12s390/spinlock: use R constraint in inline assemblyHeiko Carstens1-1/+1
Allow the compiler to generate slightly better code by using the R constraint. Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-12s390/atomic,cmpxchg: switch to use atomic-instrumented.hHeiko Carstens2-30/+58
Add arch_ prefix to all atomic operations, and define ARCH_ATOMIC. This enables KASAN instrumentation for all atomic operations on s390. This is the s390 variant of commit 8bf705d13039 ("locking/atomic/x86: Switch atomic.h to use atomic-instrumented.h"). Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-12s390/cmpxchg: get rid of gcc atomic builtinsHeiko Carstens1-15/+150
s390 is the only architecture in the kernel which makes use of gcc's atomic builtin functions. Even though I don't see any technical problem with that right now, remove this code and open-code compare-and-swap loops again, like every other architecture is doing it also. We can switch to a generic implementation when other architectures are doing that also. See also https://lwn.net/Articles/586838/ for forther details. This basically reverts commit f318a1229bd8 ("s390/cmpxchg: use compiler builtins"). Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-12s390/atomic: get rid of gcc atomic builtinsHeiko Carstens1-6/+30
s390 is the only architecture in the kernel which makes use of gcc's atomic builtin functions. Even though I don't see any technical problem with that right now, remove this code and open-code compare-and-swap loops again, like every other architecture is doing it also. We can switch to a generic implementation when other architectures are doing that also. See also https://lwn.net/Articles/586838/ for forther details. Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-12s390/atomic: use proper constraintsHeiko Carstens1-7/+7
Use the R,T, and S constraints instead of the Q constraint in atomic inline assemblies wherever possible. This allows the compiler to generate better code. (~ -2kb code size). Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-12s390/atomic: move remaining inline assemblies to atomic_ops.hHeiko Carstens2-18/+38
Move all remaining inline assemblies from atomic.h to atomic_ops.h. That way all atomic inline assemblies are contained within only a single header file. Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-12s390/bitops: make bitops only work on longsHeiko Carstens1-46/+47
The bitops code was optimized to generate test under mask instructions with the __bitops_byte() helper. However that was many years ago and in the meantime a lot of new instructions were introduced. Changing the code so that it always operates on longs nowadays even generates shorter code (~ -20kb, defconfig, gcc 10, march=zE12). Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-12s390/pci: separate zbus registration from scanningNiklas Schnelle1-1/+1
Now that the zbus can be created without being scanned we can go one step further and make registering a device to a zbus independent from scanning it. This way the zbus handling becomes much more natural in that functions can be registered on the zbus to be scanned later more closely resembling the handling of both real PCI hardware and other virtual PCI busses like Hyper-V's virtual PCI bus (see for example drivers/pci/controller/pci-hyperv.c:create_root_hv_pci_bus()). Having zbus registration separate from scanning allows us to return fully initialized but still disabled zdevs from zpci_create_device() which can then be configured just as we would configure a zdev from standby (minus the SCLP Configure already done by the platform). There is still the exception that a PCI function with non-zero devfn can be plugged before its PCI bus, which depends on the function with zero devfn, is created. In this case the zdev returend from zpci_create_device() is still missing its bus, hotplug slot, and resources which need to be created later but at least it doesn't wait in the enabled state and can otherwise be treated as initialized. With this we also separate the initial PCI scan using CLP List PCI Functions into two phases. In the CLP loop's callback we only register each function with a virtual zbus creating the latter as needed. Then, after we have built this virtual PCI topology based on our list of zbusses, we can make use of the common code functionality to scan each complete zbus as a separate child bus. Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Acked-by: Pierre Morel <pmorel@linux.ibm.com> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-12s390/pci: separate zbus creation from scanningNiklas Schnelle1-1/+2
In the existing code the creation of the PCI bus and the scanning of function zero all happens in zpci_scan_bus(). This in turn requires functions to be enabled and their resources to be available before the PCI bus is even created. This not only means that functions are enabled long before they are actually made available to the common PCI subsystem. In case of functions with non-zero devfn which appeared before the function with devfn zero they can wait arbitrarily long in this enabled but not scanned state. Fix this by separating the creation of the PCI bus from scanning it and only prepare, that is enable and setup MMIO bus resources, functions just before they are scanned. As they may be scanned multiple times track if we already created resources in the zdev. Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Acked-by: Pierre Morel <pmorel@linux.ibm.com> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-12s390/traps: convert pgm_check.S to CHeiko Carstens1-4/+0
Convert the program check table to C. Which allows to get rid of yet another assembler file, and also enables proper type checking for the table. Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-12Merge branch 'fixes' into featuresHeiko Carstens2-1/+2
* fixes: s390/entry: save the caller of psw_idle s390/entry: avoid setting up backchain in ext|io handlers s390/setup: use memblock_free_late() to free old stack s390/irq: fix reading of ext_params2 field from lowcore s390/unwind: add machine check handler stack s390/cpcmd: fix inline assembly register clobbering MAINTAINERS: add backups for s390 vfio drivers s390/vdso: fix initializing and updating of vdso_data s390/vdso: fix tod_steering_delta type s390/vdso: copy tod_steering_delta value to vdso_data page Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-05s390/cio: remove duplicate struct ccw1 declarationWan Jiabing1-3/+0
struct ccw1 is declared twice. One has been declared at 21st line. Remove the duplicate. Signed-off-by: Wan Jiabing <wanjiabing@vivo.com> Acked-by: Vineeth Vijayan <vneethv@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-04-05s390/unwind: add machine check handler stackVasily Gorbik1-0/+1
Fixes: b61b1595124a ("s390: add stack for machine check handler") Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-03-28s390/spinlock: remove align attribute from arch_spinlock_tHeiko Carstens1-1/+1
No need to add an align attribute for an integer. The alignment is correct anyway. Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-03-25s390/vdso: fix tod_steering_delta typeHeiko Carstens1-1/+1
The s390 specific vdso function __arch_get_hw_counter() is supposed to consider tod clock steering. If a tod clock steering event happens and the tod clock is set to a new value __arch_get_hw_counter() will not return the real tod clock value but slowly drift it from the old delta until the returned value finally matches the real tod clock value again. Unfortunately the type of tod_steering_delta unsigned while it is supposed to be signed. It depends on if tod_steering_delta is negative or positive in which direction the vdso code drifts the clock value. Worst case is now that instead of drifting the clock slowly it will jump into the opposite direction by a factor of two. Fix this by simply making tod_steering_delta signed. Fixes: 4bff8cb54502 ("s390: convert to GENERIC_VDSO") Cc: <stable@vger.kernel.org> # 5.10 Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-03-22s390/qdio: let driver manage the QAOBJulian Wiedmann1-18/+4
We are spending way too much effort on qdio-internal bookkeeping for QAOB management & caching, and it's still not robust. Once qdio's TX path has detached the QAOB from a PENDING buffer, we lost all track of it until it shows up in a CQ notification again. So if the device is torn down before that notification arrives, we leak the QAOB. Just have the driver take care of it, and simply pass down a QAOB if they want a TX with async-completion capability. For a buffer in PENDING state that requires the QAOB for final completion, qeth can now also try to recycle the buffer's QAOB rather than unconditionally freeing it. This also eliminates the qdio_outbuf_state array, which was only needed to transfer the aob->user1 tag from the driver to the qdio layer. Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Acked-by: Benjamin Block <bblock@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-03-22s390/pci: move zpci_remove_device() to bus codeNiklas Schnelle1-1/+0
The zpci_remove_device() function removes the device from the PCI common code core which is an operation dealing primarily with the zbus and PCI bus code. With that and to match an upcoming refactoring of the symmetric scanning part move it to the bus code. Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-03-22s390/pci: unify de-/configure for slots and eventsNiklas Schnelle1-0/+3
A zPCI event with PEC 0x0301 for an existing zPCI device goes through the same actions as enable_slot(). Similarly a zPCI event with PEC 0x0303 does the same steps as disable_slot(). We can thus unify both actions as zpci_configure_device() respectively zpci_deconfigure_device(). Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-03-22s390/pci: refactor zpci function statesNiklas Schnelle1-1/+0
The current zdev->state mixes the configuration states supported by CLP with an additional Online state which is used inconsistently to include enabled zPCI functions which are not yet visible to the common PCI subsytem. In preparation for a clean separation between architected configuration states and fine grained function states remove the Online function state. Where we previously checked for Online it is more accurate to check if the function is enabled to avoid an edge case where a disabled device was still treated as Online. This also simplifies checks whether a function is configured as this is now directly reflected by its function state. Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-03-15s390/pci: fix leak of PCI device structureNiklas Schnelle1-1/+1
In commit 05bc1be6db4b2 ("s390/pci: create zPCI bus") we removed the pci_dev_put() call matching the earlier pci_get_slot() done as part of __zpci_event_availability(). This was based on the wrong understanding that the device_put() done as part of pci_destroy_device() would counter the pci_get_slot() when it only counters the initial reference. This same understanding and existing bad example also lead to not doing a pci_dev_put() in zpci_remove_device(). Since releasing the PCI devices, unlike releasing the PCI slot, does not print any debug message for testing I added one in pci_release_dev(). This revealed that we are indeed leaking the PCI device on PCI hotunplug. Further testing also revealed another missing pci_dev_put() in disable_slot(). Fix this by adding the missing pci_dev_put() in disable_slot() and fix zpci_remove_device() with the correct pci_dev_put() calls. Also instead of calling pci_get_slot() in __zpci_event_availability() to determine if a PCI device is registered and then doing the same again in zpci_remove_device() do this once in zpci_remove_device() which makes sure that the pdev in __zpci_event_availability() is only used for the result of pci_scan_single_device() which does not need a reference count decremnt as its ownership goes to the PCI bus. Also move the check if zdev->zbus->bus is set into zpci_remove_device() since it may be that we're removing a device with devfn != 0 which never had a PCI bus. So we can still set the pdev->error_state to indicate that the device is not usable anymore, add a flag to set the error state. Fixes: 05bc1be6db4b2 ("s390/pci: create zPCI bus") Cc: <stable@vger.kernel.org> # 5.8+: e1bff843cde6 s390/pci: remove superfluous zdev->zbus check Cc: <stable@vger.kernel.org> # 5.8+: ba764dd703fe s390/pci: refactor zpci_create_device() Cc: <stable@vger.kernel.org> # 5.8+ Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-03-09KVM: s390: diag9c (directed yield) forwardingPierre Morel2-0/+2
When we intercept a DIAG_9C from the guest we verify that the target real CPU associated with the virtual CPU designated by the guest is running and if not we forward the DIAG_9C to the target real CPU. To avoid a diag9c storm we allow a maximal rate of diag9c forwarding. The rate is calculated as a count per second defined as a new parameter of the s390 kvm module: diag9c_forwarding_hz . The default value of 0 is to not forward diag9c. Signed-off-by: Pierre Morel <pmorel@linux.ibm.com> Link: https://lore.kernel.org/r/1613997661-22525-2-git-send-email-pmorel@linux.ibm.com Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2021-03-08s390/cpumf: rename header file to hwctrset.hThomas Richter1-0/+0
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Suggested-by: Hendrick Brueckner <brueckner@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-03-08s390/time,idle: get rid of unsigned long longHeiko Carstens2-24/+24
Get rid of unsigned long long, and use unsigned long instead everywhere. The usage of unsigned long long is a leftover from 31 bit kernel support. Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-02-26Merge tag 's390-5.12-2' of ↵Linus Torvalds4-9/+72
git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull more s390 updates from Vasily Gorbik: - Fix physical vs virtual confusion in some basic mm macros and routines. Caused by __pa == __va on s390 currently. - Get rid of on-stack cpu masks. - Add support for complete CPU counter set extraction. - Add arch_irq_work_raise implementation. - virtio-ccw revision and opcode fixes. * tag 's390-5.12-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/cpumf: Add support for complete counter set extraction virtio/s390: implement virtio-ccw revision 2 correctly s390/smp: implement arch_irq_work_raise() s390/topology: move cpumasks away from stack s390/smp: smp_emergency_stop() - move cpumask away from stack s390/smp: __smp_rescan_cpus() - move cpumask away from stack s390/smp: consolidate locking for smp_rescan() s390/mm: fix phys vs virt confusion in vmem_*() functions family s390/mm: fix phys vs virt confusion in pgtable allocation routines s390/mm: fix invalid __pa() usage in pfn_pXd() macros s390/mm: make pXd_deref() macros return a pointer s390/opcodes: rename selhhhr to selfhr
2021-02-25Merge tag 'pci-v5.12-changes' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci Pull PCI updates from Bjorn Helgaas: "Enumeration: - Remove unnecessary locking around _OSC (Bjorn Helgaas) - Clarify message about _OSC failure (Bjorn Helgaas) - Remove notification of PCIe bandwidth changes (Bjorn Helgaas) - Tidy checking of syscall user config accessors (Heiner Kallweit) Resource management: - Decline to resize resources if boot config must be preserved (Ard Biesheuvel) - Fix pci_register_io_range() memory leak (Geert Uytterhoeven) Error handling (Keith Busch): - Clear error status from the correct device - Retain error recovery status so drivers can use it after reset - Log the type of Port (Root or Switch Downstream) that we reset - Always request a reset for Downstream Ports in frozen state Endpoint framework and NTB (Kishon Vijay Abraham I): - Make *_get_first_free_bar() take into account 64 bit BAR - Add helper API to get the 'next' unreserved BAR - Make *_free_bar() return error codes on failure - Remove unused pci_epf_match_device() - Add support to associate secondary EPC with EPF - Add support in configfs to associate two EPCs with EPF - Add pci_epc_ops to map MSI IRQ - Add pci_epf_ops to expose function-specific attrs - Allow user to create sub-directory of 'EPF Device' directory - Implement ->msi_map_irq() ops for cadence - Configure LM_EP_FUNC_CFG based on epc->function_num_map for cadence - Add EP function driver to provide NTB functionality - Add support for EPF PCI Non-Transparent Bridge - Add specification for PCI NTB function device - Add PCI endpoint NTB function user guide - Add configfs binding documentation for pci-ntb endpoint function Broadcom STB PCIe controller driver: - Add support for BCM4908 and external PERST# signal controller (Rafał Miłecki) Cadence PCIe controller driver: - Retrain Link to work around Gen2 training defect (Nadeem Athani) - Fix merge botch in cdns_pcie_host_map_dma_ranges() (Krzysztof Wilczyński) Freescale Layerscape PCIe controller driver: - Add LX2160A rev2 EP mode support (Hou Zhiqiang) - Convert to builtin_platform_driver() (Michael Walle) MediaTek PCIe controller driver: - Fix OF node reference leak (Krzysztof Wilczyński) Microchip PolarFlare PCIe controller driver: - Add Microchip PolarFire PCIe controller driver (Daire McNamara) Qualcomm PCIe controller driver: - Use PHY_REFCLK_USE_PAD only for ipq8064 (Ansuel Smith) - Add support for ddrss_sf_tbu clock for sm8250 (Dmitry Baryshkov) Renesas R-Car PCIe controller driver: - Drop PCIE_RCAR config option (Lad Prabhakar) - Always allocate MSI addresses in 32bit space (Marek Vasut) Rockchip PCIe controller driver: - Add FriendlyARM NanoPi M4B DT binding (Chen-Yu Tsai) - Make 'ep-gpios' DT property optional (Chen-Yu Tsai) Synopsys DesignWare PCIe controller driver: - Work around ECRC configuration hardware defect (Vidya Sagar) - Drop support for config space in DT 'ranges' (Rob Herring) - Change size to u64 for EP outbound iATU (Shradha Todi) - Add upper limit address for outbound iATU (Shradha Todi) - Make dw_pcie ops optional (Jisheng Zhang) - Remove unnecessary dw_pcie_ops from al driver (Jisheng Zhang) Xilinx Versal CPM PCIe controller driver: - Fix OF node reference leak (Pan Bian) Miscellaneous: - Remove tango host controller driver (Arnd Bergmann) - Remove IRQ handler & data together (altera-msi, brcmstb, dwc) (Martin Kaiser) - Fix xgene-msi race in installing chained IRQ handler (Martin Kaiser) - Apply CONFIG_PCI_DEBUG to entire drivers/pci hierarchy (Junhao He) - Fix pci-bridge-emul array overruns (Russell King) - Remove obsolete uses of WARN_ON(in_interrupt()) (Sebastian Andrzej Siewior)" * tag 'pci-v5.12-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (69 commits) PCI: qcom: Use PHY_REFCLK_USE_PAD only for ipq8064 PCI: qcom: Add support for ddrss_sf_tbu clock dt-bindings: PCI: qcom: Document ddrss_sf_tbu clock for sm8250 PCI: al: Remove useless dw_pcie_ops PCI: dwc: Don't assume the ops in dw_pcie always exist PCI: dwc: Add upper limit address for outbound iATU PCI: dwc: Change size to u64 for EP outbound iATU PCI: dwc: Drop support for config space in 'ranges' PCI: layerscape: Convert to builtin_platform_driver() PCI: layerscape: Add LX2160A rev2 EP mode support dt-bindings: PCI: layerscape: Add LX2160A rev2 compatible strings PCI: dwc: Work around ECRC configuration issue PCI/portdrv: Report reset for frozen channel PCI/AER: Specify the type of Port that was reset PCI/ERR: Retain status from error notification PCI/AER: Clear AER status from Root Port when resetting Downstream Port PCI/ERR: Clear status of the reporting device dt-bindings: arm: rockchip: Add FriendlyARM NanoPi M4B PCI: rockchip: Make 'ep-gpios' DT property optional Documentation: PCI: Add PCI endpoint NTB function user guide ...
2021-02-24Merge tag 'x86-entry-2021-02-24' of ↵Linus Torvalds1-1/+0
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 irq entry updates from Thomas Gleixner: "The irq stack switching was moved out of the ASM entry code in course of the entry code consolidation. It ended up being suboptimal in various ways. This reworks the X86 irq stack handling: - Make the stack switching inline so the stackpointer manipulation is not longer at an easy to find place. - Get rid of the unnecessary indirect call. - Avoid the double stack switching in interrupt return and reuse the interrupt stack for softirq handling. - A objtool fix for CONFIG_FRAME_POINTER=y builds where it got confused about the stack pointer manipulation" * tag 'x86-entry-2021-02-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: objtool: Fix stack-swizzle for FRAME_POINTER=y um: Enforce the usage of asm-generic/softirq_stack.h x86/softirq/64: Inline do_softirq_own_stack() softirq: Move do_softirq_own_stack() to generic asm header softirq: Move __ARCH_HAS_DO_SOFTIRQ to Kconfig x86: Select CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK x86/softirq: Remove indirection in do_softirq_own_stack() x86/entry: Use run_sysvec_on_irqstack_cond() for XEN upcall x86/entry: Convert device interrupts to inline stack switching x86/entry: Convert system vectors to irq stack macro x86/irq: Provide macro for inlining irq stack switching x86/apic: Split out spurious handling code x86/irq/64: Adjust the per CPU irq stack pointer by 8 x86/irq: Sanitize irq stack tracking x86/entry: Fix instrumentation annotation
2021-02-24s390/cpumf: Add support for complete counter set extractionThomas Richter1-0/+51
Add support to the CPU Measurement counter facility device driver to extract complete counter sets per CPU and per counter set from user space. This includes a new device named /dev/hwctr and support for the device driver functions open, close and ioctl. Other functions are not supported. The ioctl command supports 3 subcommands: S390_HWCTR_START: enables counter sets on a list of CPUs. S390_HWCTR_STOP: disables counter sets on a list of CPUs. S390_HWCTR_READ: reads counter sets on a list of CPUs. The ioctl(..., S390_HWCTR_READ, ...) is the only subcommand which returns data. It requires member data_bytes to be positive and indicates the maximum amount of data available to store counter set data. The other ioctl() subcommands do not use this member and it should be set to zero. The S390_HWCTR_READ subcommand returns the following data: The cpuset data is flattened using the following scheme, stored in member data: 0x0 0x8 0xc 0x10 0x10 0x18 0x20 0x28 0xU-1 +---------+-----+---------+-----+---------+-----+-----+------+------+ | no_cpus | cpu | no_sets | set | no_cnts | cv1 | cv2 | .... | cv_n | +---------+-----+---------+-----+---------+-----+-----+------+------+ 0xU 0xU+4 0xU+8 0xU+10 0xV-1 +-----+---------+-----+-----+------+------+ | set | no_cnts | cv1 | cv2 | .... | cv_n | +-----+---------+-----+-----+------+------+ 0xV 0xV+4 0xV+8 0xV+c +-----+---------+-----+---------+-----+-----+------+------+ | cpu | no_sets | set | no_cnts | cv1 | cv2 | .... | cv_n | +-----+---------+-----+---------+-----+-----+------+------+ U and V denote arbitrary hexadezimal addresses. The first integer represents the number of CPUs data was extracted from. This is followed by CPU number and number of counter sets extracted. Both are two integer values. This is followed by the set identifer and number of counters extracted. Both are two integer values. This is followed by the counter values, each element is eight bytes in size. The S390_HWCTR_READ ioctl subcommand is also limited to one call per minute. This ensures that an application does not read out the counter sets too often and reduces the overall CPU performance. The complete counter set extraction is an expensive operation. Reviewed-by: Sumanth Korikkar <sumanthk@linux.ibm.com> Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2021-02-24s390/smp: implement arch_irq_work_raise()Ilya Leoshkevich1-0/+12
The immediate need to have this is to have bpf_send_signal() send the signal ASAP instead of during the next hrtimer interrupt. However, it should also improve irq_work_queue() latencies in general, as well as get s390 out of the lame architectures list [1]. [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/kernel/irq_work.c?h=v5.11#n45 Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2021-02-24s390/mm: fix phys vs virt confusion in pgtable allocation routinesAlexander Gordeev1-1/+1
The physical address of page tables is passed around and used as virtual address in various locations. Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2021-02-24s390/mm: fix invalid __pa() usage in pfn_pXd() macrosAlexander Gordeev1-2/+2
There is little sense in applying __pa() to a physical address, but that what pfn_pXd() macros do. Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2021-02-24s390/mm: make pXd_deref() macros return a pointerAlexander Gordeev1-6/+6
This update fixes semantics of pXd_deref macros which are expected to return a CPU-addressable pointer. Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2021-02-21Merge tag 's390-5.12-1' of ↵Linus Torvalds27-184/+297
git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 updates from Vasily Gorbik: - Convert to using the generic entry infrastructure. - Add vdso time namespace support. - Switch s390 and alpha to 64-bit ino_t. As discussed at https://lore.kernel.org/linux-mm/YCV7QiyoweJwvN+m@osiris/ - Get rid of expensive stck (store clock) usages where possible. Utilize cpu alternatives to patch stckf when supported. - Make tod_clock usage less error prone by converting it to a union and rework code which is using it. - Machine check handler fixes and cleanups. - Drop couple of minor inline asm optimizations to fix clang build. - Default configs changes notably to make libvirt happy. - Various changes to rework and improve qdio code. - Other small various fixes and improvements all over the code. * tag 's390-5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (68 commits) s390/qdio: remove 'merge_pending' mechanism s390/qdio: improve handling of PENDING buffers for QEBSM devices s390/qdio: rework q->qdio_error indication s390/qdio: inline qdio_kick_handler() s390/time: remove get_tod_clock_ext() s390/crypto: use store_tod_clock_ext() s390/hypfs: use store_tod_clock_ext() s390/debug: use union tod_clock s390/kvm: use union tod_clock s390/vdso: use union tod_clock s390/time: convert tod_clock_base to union s390/time: introduce new store_tod_clock_ext() s390/time: rename store_tod_clock_ext() and use union tod_clock s390/time: introduce union tod_clock s390,alpha: switch to 64-bit ino_t s390: split cleanup_sie s390: use r13 in cleanup_sie as temp register s390: fix kernel asce loading when sie is interrupted s390: add stack for machine check handler s390: use WRITE_ONCE when re-allocating async stack ...
2021-02-21Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds1-1/+0
Pull KVM updates from Paolo Bonzini: "x86: - Support for userspace to emulate Xen hypercalls - Raise the maximum number of user memslots - Scalability improvements for the new MMU. Instead of the complex "fast page fault" logic that is used in mmu.c, tdp_mmu.c uses an rwlock so that page faults are concurrent, but the code that can run against page faults is limited. Right now only page faults take the lock for reading; in the future this will be extended to some cases of page table destruction. I hope to switch the default MMU around 5.12-rc3 (some testing was delayed due to Chinese New Year). - Cleanups for MAXPHYADDR checks - Use static calls for vendor-specific callbacks - On AMD, use VMLOAD/VMSAVE to save and restore host state - Stop using deprecated jump label APIs - Workaround for AMD erratum that made nested virtualization unreliable - Support for LBR emulation in the guest - Support for communicating bus lock vmexits to userspace - Add support for SEV attestation command - Miscellaneous cleanups PPC: - Support for second data watchpoint on POWER10 - Remove some complex workarounds for buggy early versions of POWER9 - Guest entry/exit fixes ARM64: - Make the nVHE EL2 object relocatable - Cleanups for concurrent translation faults hitting the same page - Support for the standard TRNG hypervisor call - A bunch of small PMU/Debug fixes - Simplification of the early init hypercall handling Non-KVM changes (with acks): - Detection of contended rwlocks (implemented only for qrwlocks, because KVM only needs it for x86) - Allow __DISABLE_EXPORTS from assembly code - Provide a saner follow_pfn replacements for modules" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (192 commits) KVM: x86/xen: Explicitly pad struct compat_vcpu_info to 64 bytes KVM: selftests: Don't bother mapping GVA for Xen shinfo test KVM: selftests: Fix hex vs. decimal snafu in Xen test KVM: selftests: Fix size of memslots created by Xen tests KVM: selftests: Ignore recently added Xen tests' build output KVM: selftests: Add missing header file needed by xAPIC IPI tests KVM: selftests: Add operand to vmsave/vmload/vmrun in svm.c KVM: SVM: Make symbol 'svm_gp_erratum_intercept' static locking/arch: Move qrwlock.h include after qspinlock.h KVM: PPC: Book3S HV: Fix host radix SLB optimisation with hash guests KVM: PPC: Book3S HV: Ensure radix guest has no SLB entries KVM: PPC: Don't always report hash MMU capability for P9 < DD2.2 KVM: PPC: Book3S HV: Save and restore FSCR in the P9 path KVM: PPC: remove unneeded semicolon KVM: PPC: Book3S HV: Use POWER9 SLBIA IH=6 variant to clear SLB KVM: PPC: Book3S HV: No need to clear radix host SLB before loading HPT guest KVM: PPC: Book3S HV: Fix radix guest SLB side channel KVM: PPC: Book3S HV: Remove support for running HPT guest on RPT host without mixed mode support KVM: PPC: Book3S HV: Introduce new capability for 2nd DAWR KVM: PPC: Book3S HV: Add infrastructure to support 2nd DAWR ...
2021-02-13s390/qdio: remove 'merge_pending' mechanismJulian Wiedmann1-4/+0
For non-QEBSM devices, get_buf_states() merges PENDING and EMPTY buffers into a single group of finished buffers. To allow the upper-layer driver to differentiate between the two states, qdio_check_pending() looks at each buffer's state again and sets the sbal_state flag to QDIO_OUTBUF_STATE_FLAG_PENDING accordingly. So effectively we're spending overhead on _every_ Output Queue inspection, just to avoid some additional TX completion calls in case a group of buffers has completed with mixed EMPTY / PENDING state. Given that PENDING buffers should rarely occur, this is a bad trade-off. In particular so as the additional checks in get_buf_states() affect _all_ device types (even those that don't use the PENDING state). Rip it all out, and just report the PENDING completions separately as we already do for QEBSM devices. Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Reviewed-by: Benjamin Block <bblock@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-08 19:33:30 +0000