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2018-04-10s390/ipl: correct kdump reipl block checksum calculationVasily Gorbik3-6/+7
s390 kdump reipl implementation relies on os_info kernel structure residing in old memory being dumped. os_info contains reipl block, which is used (if valid) by the kdump kernel for reipl parameters. The problem is that the reipl block and its checksum inside os_info is updated only when /sys/firmware/reipl/reipl_type is written. This sets an offset of a reipl block for "reipl_type" and re-calculates reipl block checksum. Any further alteration of values under /sys/firmware/reipl/{reipl_type}/ without subsequent write to /sys/firmware/reipl/reipl_type lead to incorrect os_info reipl block checksum. In such a case kdump kernel ignores it and reboots using default logic. To fix this, os_info reipl block update is moved right before kdump execution. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-04-10s390/ipl: remove non-existing functions declarationVasily Gorbik1-3/+0
do_reipl, do_halt and do_poff are not defined anywhere. Cleaning up functions declaration. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-04-10s390: assume diag308 set always worksVasily Gorbik7-358/+16
diag308 set has been available for many machine generations, and alternative reipl code paths has not been exercised and seems to be broken without noticing for a while now. So, cleaning up all obsolete reipl methods except currently used ones, assuming that diag308 set always works. Also removing not longer needed reset callbacks. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-04-10s390/ipl: avoid adding scpdata to cmdline during ftp/dvd bootVasily Gorbik1-1/+1
Add missing ipl parmblock validity check to append_ipl_scpdata. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-04-10s390/ipl: correct ipl parmblock valid checksVasily Gorbik1-6/+4
In some cases diag308_set_works used to be misused as "we have valid ipl parmblock", which is not the case when diag308 set works, but there is no ipl parmblock (diag308 store returns DIAG308_RC_NOCONFIG). Such checks are adjusted to reuse ipl_block_valid instead of diag308_set_works. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-04-10s390/ipl: rely on diag308 store to get ipl infoVasily Gorbik5-86/+17
For both ccw and fcp boot retrieve ipl info from ipl block received via diag308 store. Old scsi ipl parm block handling and cio_get_iplinfo are removed. Ipl type is deducted from ipl block (if valid). Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-04-10s390/ipl: move ipl_flags to ipl.cVasily Gorbik2-11/+9
ipl_flags and corresponding enum are not used outside of ipl.c and will be reworked in later commits. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-04-10s390/ipl: get rid of ipl_ssid and ipl_devnoVasily Gorbik1-9/+8
ipl_ssid and ipl_devno used to be used during ccw boot when diag308 store was not available. Reuse ipl_block to store those values. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-04-10s390/ipl: unite diag308 and scsi boot ipl blocksVasily Gorbik2-29/+26
Ipl parm blocks received via "diag308 store" and during scsi boot at IPL_PARMBLOCK_ORIGIN are merged into the "ipl_block". Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-04-10s390/ipl: ensure loadparm valid flag is setVasily Gorbik1-0/+1
When loadparm is set in reipl parm block, the kernel should also set DIAG308_FLAGS_LP_VALID flag. This fixes loadparm ignoring during z/VM fcp -> ccw reipl and kvm direct boot -> ccw reipl. Cc: <stable@vger.kernel.org> Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-04-10s390/compat: fix setup_frame32Heiko Carstens1-1/+1
Git commit c60a03fee0e5 ("s390: switch to {get,put}_compat_sigset()") contains a typo and now copies the wrong pointer to user space. Use the correct pointer instead. Reported-and-tested-by: Stefan Liebler <stli@linux.vnet.ibm.com> Fixes: c60a03fee0e5 ("s390: switch to {get,put}_compat_sigset()") Cc: <stable@vger.kernel.org> # v4.15+ Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-04-10s390/crypto: Adjust s390 aes and paes cipher prioritiesHarald Freudenberger2-8/+8
Tests with paes-xts and debugging investigations showed that the ciphers are not always correctly resolved. The rules for cipher priorities seem to be: - Ecb-aes should have a prio greater than the generic ecb-aes. - The mode specialized ciphers (like cbc-aes-s390) should have a prio greater than the sum of the more generic combinations (like cbs(aes)). This patch adjusts the cipher priorities for the s390 aes and paes in kernel crypto implementations. Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-04-09Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds11-67/+152
Pull kvm updates from Paolo Bonzini: "ARM: - VHE optimizations - EL2 address space randomization - speculative execution mitigations ("variant 3a", aka execution past invalid privilege register access) - bugfixes and cleanups PPC: - improvements for the radix page fault handler for HV KVM on POWER9 s390: - more kvm stat counters - virtio gpu plumbing - documentation - facilities improvements x86: - support for VMware magic I/O port and pseudo-PMCs - AMD pause loop exiting - support for AMD core performance extensions - support for synchronous register access - expose nVMX capabilities to userspace - support for Hyper-V signaling via eventfd - use Enlightened VMCS when running on Hyper-V - allow userspace to disable MWAIT/HLT/PAUSE vmexits - usual roundup of optimizations and nested virtualization bugfixes Generic: - API selftest infrastructure (though the only tests are for x86 as of now)" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (174 commits) kvm: x86: fix a prototype warning kvm: selftests: add sync_regs_test kvm: selftests: add API testing infrastructure kvm: x86: fix a compile warning KVM: X86: Add Force Emulation Prefix for "emulate the next instruction" KVM: X86: Introduce handle_ud() KVM: vmx: unify adjacent #ifdefs x86: kvm: hide the unused 'cpu' variable KVM: VMX: remove bogus WARN_ON in handle_ept_misconfig Revert "KVM: X86: Fix SMRAM accessing even if VM is shutdown" kvm: Add emulation for movups/movupd KVM: VMX: raise internal error for exception during invalid protected mode state KVM: nVMX: Optimization: Dont set KVM_REQ_EVENT when VMExit with nested_run_pending KVM: nVMX: Require immediate-exit when event reinjected to L2 and L1 event pending KVM: x86: Fix misleading comments on handling pending exceptions KVM: x86: Rename interrupt.pending to interrupt.injected KVM: VMX: No need to clear pending NMI/interrupt on inject realmode interrupt x86/kvm: use Enlightened VMCS when running on Hyper-V x86/hyper-v: detect nested features x86/hyper-v: define struct hv_enlightened_vmcs and clean field bits ...
2018-04-09Merge branch 'for-linus' of ↵Linus Torvalds29-195/+614
git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 updates from Martin Schwidefsky: - Improvements for the spectre defense: * The spectre related code is consolidated to a single file nospec-branch.c * Automatic enable/disable for the spectre v2 defenses (expoline vs. nobp) * Syslog messages for specve v2 are added * Enable CONFIG_GENERIC_CPU_VULNERABILITIES and define the attribute functions for spectre v1 and v2 - Add helper macros for assembler alternatives and use them to shorten the code in entry.S. - Add support for persistent configuration data via the SCLP Store Data interface. The H/W interface requires a page table that uses 4K pages only, the code to setup such an address space is added as well. - Enable virtio GPU emulation in QEMU. To do this the depends statements for a few common Kconfig options are modified. - Add support for format-3 channel path descriptors and add a binary sysfs interface to export the associated utility strings. - Add a sysfs attribute to control the IFCC handling in case of constant channel errors. - The vfio-ccw changes from Cornelia. - Bug fixes and cleanups. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (40 commits) s390/kvm: improve stack frame constants in entry.S s390/lpp: use assembler alternatives for the LPP instruction s390/entry.S: use assembler alternatives s390: add assembler macros for CPU alternatives s390: add sysfs attributes for spectre s390: report spectre mitigation via syslog s390: add automatic detection of the spectre defense s390: move nobp parameter functions to nospec-branch.c s390/cio: add util_string sysfs attribute s390/chsc: query utility strings via fmt3 channel path descriptor s390/cio: rename struct channel_path_desc s390/cio: fix unbind of io_subchannel_driver s390/qdio: split up CCQ handling for EQBS / SQBS s390/qdio: don't retry EQBS after CCQ 96 s390/qdio: restrict buffer merging to eligible devices s390/qdio: don't merge ERROR output buffers s390/qdio: simplify math in get_*_buffer_frontier() s390/decompressor: trim uncompressed image head during the build s390/crypto: Fix kernel crash on aes_s390 module remove. s390/defkeymap: fix global init to zero ...
2018-04-06headers: untangle kmemleak.h from mm.hRandy Dunlap2-2/+1
Currently <linux/slab.h> #includes <linux/kmemleak.h> for no obvious reason. It looks like it's only a convenience, so remove kmemleak.h from slab.h and add <linux/kmemleak.h> to any users of kmemleak_* that don't already #include it. Also remove <linux/kmemleak.h> from source files that do not use it. This is tested on i386 allmodconfig and x86_64 allmodconfig. It would be good to run it through the 0day bot for other $ARCHes. I have neither the horsepower nor the storage space for the other $ARCHes. Update: This patch has been extensively build-tested by both the 0day bot & kisskb/ozlabs build farms. Both of them reported 2 build failures for which patches are included here (in v2). [ slab.h is the second most used header file after module.h; kernel.h is right there with slab.h. There could be some minor error in the counting due to some #includes having comments after them and I didn't combine all of those. ] [akpm@linux-foundation.org: security/keys/big_key.c needs vmalloc.h, per sfr] Link: http://lkml.kernel.org/r/e4309f98-3749-93e1-4bb7-d9501a39d015@infradead.org Link: http://kisskb.ellerman.id.au/kisskb/head/13396/ Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Reviewed-by: Ingo Molnar <mingo@kernel.org> Reported-by: Michael Ellerman <mpe@ellerman.id.au> [2 build failures] Reported-by: Fengguang Wu <fengguang.wu@intel.com> [2 build failures] Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Wei Yongjun <weiyongjun1@huawei.com> Cc: Luis R. Rodriguez <mcgrof@kernel.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Mimi Zohar <zohar@linux.vnet.ibm.com> Cc: John Johansen <john.johansen@canonical.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-04-02mm: add ksys_readahead() helper; remove in-kernel calls to sys_readahead()Dominik Brodowski1-1/+1
Using this helper allows us to avoid the in-kernel calls to the sys_readahead() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_readahead(). This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Andrew Morton <akpm@linux-foundation.org> Cc: linux-mm@kvack.org Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-04-02mm: add ksys_mmap_pgoff() helper; remove in-kernel calls to sys_mmap_pgoff()Dominik Brodowski2-4/+4
Using this helper allows us to avoid the in-kernel calls to the sys_mmap_pgoff() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_mmap_pgoff(). This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Andrew Morton <akpm@linux-foundation.org> Cc: linux-mm@kvack.org Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-04-02mm: add ksys_fadvise64_64() helper; remove in-kernel call to sys_fadvise64_64()Dominik Brodowski1-2/+3
Using the ksys_fadvise64_64() helper allows us to avoid the in-kernel calls to the sys_fadvise64_64() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as ksys_fadvise64_64(). Some compat stubs called sys_fadvise64(), which then just passed through the arguments to sys_fadvise64_64(). Get rid of this indirection, and call ksys_fadvise64_64() directly. This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Andrew Morton <akpm@linux-foundation.org> Cc: linux-mm@kvack.org Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-04-02fs: add ksys_fallocate() wrapper; remove in-kernel calls to sys_fallocate()Dominik Brodowski1-2/+2
Using the ksys_fallocate() wrapper allows us to get rid of in-kernel calls to the sys_fallocate() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_fallocate(). This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-04-02fs: add ksys_p{read,write}64() helpers; remove in-kernel calls to syscallsDominik Brodowski1-2/+2
Using the ksys_p{read,write}64() wrappers allows us to get rid of in-kernel calls to the sys_pread64() and sys_pwrite64() syscalls. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_p{read,write}64(). This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-04-02fs: add ksys_truncate() wrapper; remove in-kernel calls to sys_truncate()Dominik Brodowski1-1/+1
Using the ksys_truncate() wrapper allows us to get rid of in-kernel calls to the sys_truncate() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_truncate(). This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-04-02fs: add ksys_sync_file_range helper(); remove in-kernel calls to syscallDominik Brodowski1-1/+1
Using this helper allows us to avoid the in-kernel calls to the sys_sync_file_range() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_sync_file_range(). This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-04-02fs: add ksys_read() helper; remove in-kernel calls to sys_read()Dominik Brodowski1-1/+1
Using this helper allows us to avoid the in-kernel calls to the sys_read() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_read(). This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-04-02fs: add ksys_ftruncate() wrapper; remove in-kernel calls to sys_ftruncate()Dominik Brodowski1-1/+1
Using the ksys_ftruncate() wrapper allows us to get rid of in-kernel calls to the sys_ftruncate() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_ftruncate(). This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-04-02fs: add do_fchownat(), ksys_fchown() helpers and ksys_{,l}chown() wrappersDominik Brodowski1-3/+3
Using the fs-interal do_fchownat() wrapper allows us to get rid of fs-internal calls to the sys_fchownat() syscall. Introducing the ksys_fchown() helper and the ksys_{,}chown() wrappers allows us to avoid the in-kernel calls to the sys_{,l,f}chown() syscalls. The ksys_ prefix denotes that these functions are meant as a drop-in replacement for the syscalls. In particular, they use the same calling convention as sys_{,l,f}chown(). This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-04-02fs: add ksys_write() helper; remove in-kernel calls to sys_write()Dominik Brodowski1-1/+1
Using this helper allows us to avoid the in-kernel calls to the sys_write() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_write(). In the near future, the do_mounts / initramfs callers of ksys_write() should be converted to use filp_open() and vfs_write() instead. This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: linux-s390@vger.kernel.org Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2018-03-28s390/kvm: improve stack frame constants in entry.SMartin Schwidefsky2-13/+14
The code in sie64a uses the stack frame passed to the function to store some temporary data in the empty1 array (see struct stack_frame in asm/processor.h. Replace the __SF_EMPTY+x constants with a properly defined offset: s/__SF_EMPTY/__SF_SIE_CONTROL/, s/__SF_EMPTY+8/__SF_SIE_SAVEAREA/, s/__SF_EMPTY+16/__SF_SIE_REASON/, s/__SF_EMPTY+24/__SF_SIE_FLAGS/. Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-03-28s390/lpp: use assembler alternatives for the LPP instructionMartin Schwidefsky4-14/+8
With the new macros for CPU alternatives the MACHINE_FLAG_LPP check around the LPP instruction can be optimized. After this is done the flag can be removed. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-03-28s390/entry.S: use assembler alternativesMartin Schwidefsky1-49/+7
Replace the open coded alternatives for the BPOFF, BPON, BPENTER, and BPEXIT macros with the new magic from asm/alternatives-asm.h to make the code easier to read. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-03-28s390: add assembler macros for CPU alternativesMartin Schwidefsky1-0/+108
Add a header with macros usable in assembler files to emit alternative code sequences. It works analog to the alternatives for inline assmeblies in C files, with the same restrictions and capabilities. The syntax is ALTERNATIVE "<default instructions sequence>", \ "<alternative instructions sequence>", \ "<features-bit>" and ALTERNATIVE_2 "<default instructions sequence>", \ "<alternative instructions sqeuence #1>", \ "<feature-bit #1>", "<alternative instructions sqeuence #2>", \ "<feature-bit #2>" Reviewed-by: Vasily Gorbik <gor@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-03-28s390: add sysfs attributes for spectreMartin Schwidefsky2-0/+20
Set CONFIG_GENERIC_CPU_VULNERABILITIES and provide the two functions cpu_show_spectre_v1 and cpu_show_spectre_v2 to report the spectre mitigations. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-03-28s390: report spectre mitigation via syslogMartin Schwidefsky1-0/+10
Add a boot message if either of the spectre defenses is active. The message is "Spectre V2 mitigation: execute trampolines." or "Spectre V2 mitigation: limited branch prediction." Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-03-28s390: add automatic detection of the spectre defenseMartin Schwidefsky6-38/+52
Automatically decide between nobp vs. expolines if the spectre_v2=auto kernel parameter is specified or CONFIG_EXPOLINE_AUTO=y is set. The decision made at boot time due to CONFIG_EXPOLINE_AUTO=y being set can be overruled with the nobp, nospec and spectre_v2 kernel parameters. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-03-28s390: move nobp parameter functions to nospec-branch.cMartin Schwidefsky3-25/+29
Keep the code for the nobp parameter handling with the code for expolines. Both are related to the spectre v2 mitigation. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-03-26s390/chsc: query utility strings via fmt3 channel path descriptorSebastian Ott1-2/+4
Add support for format 3 channel path descriptors and use them to gather utility strings. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-03-26s390/cio: rename struct channel_path_descSebastian Ott2-2/+2
Rename struct channel_path_desc to struct channel_path_desc_fmt0 to fit the scheme. Provide a macro for the function wrappers that gather this and related data from firmware. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-03-19s390/decompressor: trim uncompressed image head during the buildVasily Gorbik2-8/+14
It seems to be suboptimal to compress the entire image, so that we could decompress and throw away the first 68k (0x11000) during the boot process. This patch trims 0x11000 bytes during the build process and adjusts symbols in size.h accordingly. Besides making bzImage smaller, this change would also be a benefit for kaslr. It allows to decompress the kernel right to desired offset, without worrying about dead weight in front of the decompressed image. Signed-off-by: Vasily Gorbik <gor@linux.vnet.ibm.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-03-19s390/crypto: Fix kernel crash on aes_s390 module remove.Harald Freudenberger1-1/+4
A kernel crash occurs when the aes_s390 kernel module is removed on machines < z14. This only happens on kernel version 4.15 and higher on machines not supporting MSA 8. The reason for the crash is a unconditional crypto_unregister_aead() invocation where no previous crypto_register_aead() had been called. The fix now remembers if there has been a successful registration and only then calls the unregister function upon kernel module remove. The code now crashing has been introduced with "bf7fa03 s390/crypto: add s390 platform specific aes gcm support." Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-03-19s390/setup : enable display support for KVM guestFarhan Ali1-0/+2
The S390 architecture does not support any graphics hardware, but with the latest support for Virtio GPU in Linux and Virtio GPU emulation in QEMU, it's possible to enable graphics for S390 using the Virtio GPU device. To enable display we need to enable the Linux Virtual Terminal (VT) layer for S390. But the VT subsystem initializes quite early at boot so we need a dummy console driver till the Virtio GPU driver is initialized and we can run the framebuffer console. The framebuffer console over a Virtio GPU device can be run in combination with the serial SCLP console (default on S390). The SCLP console can still be accessed by management applications (eg: via Libvirt's virsh console). Signed-off-by: Farhan Ali <alifm@linux.vnet.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Message-Id: <e23b61f4f599ba23881727a1e8880e9d60cc6a48.1519315352.git.alifm@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-03-17Merge tag 'kvm-s390-next-4.17-1' of ↵Paolo Bonzini11-66/+150
git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD KVM: s390: fixes and features - more kvm stat counters - virtio gpu plumbing. The 3 non-KVM/s390 patches have Acks from Bartlomiej Zolnierkiewicz, Heiko Carstens and Greg Kroah-Hartman but all belong together to make virtio-gpu work as a tty. So I carried them in the KVM/s390 tree. - document some KVM_CAPs - cpu-model only facilities - cleanups
2018-03-14KVM: s390: provide counters for all interrupt injects/deliveryChristian Borntraeger3-11/+63
For testing the exitless interrupt support it turned out useful to have separate counters for inject and delivery of I/O interrupt. While at it do the same for all interrupt types. For timer related interrupts (clock comparator and cpu timer) we even had no delivery counters. Fix this as well. On this way some counters are being renamed to have a similar name. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com>
2018-03-14KVM: add machine check counter to kvm_statQingFeng Hao3-0/+3
This counter can be used for administration, debug or test purposes. Suggested-by: Vladislav Mironov <mironov@de.ibm.com> Signed-off-by: QingFeng Hao <haoqf@linux.vnet.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2018-03-14s390/setup: enable display support for KVM guestFarhan Ali1-0/+2
The S390 architecture does not support any graphics hardware, but with the latest support for Virtio GPU in Linux and Virtio GPU emulation in QEMU, it's possible to enable graphics for S390 using the Virtio GPU device. To enable display we need to enable the Linux Virtual Terminal (VT) layer for S390. But the VT subsystem initializes quite early at boot so we need a dummy console driver till the Virtio GPU driver is initialized and we can run the framebuffer console. The framebuffer console over a Virtio GPU device can be run in combination with the serial SCLP console (default on S390). The SCLP console can still be accessed by management applications (eg: via Libvirt's virsh console). Signed-off-by: Farhan Ali <alifm@linux.vnet.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Message-Id: <e23b61f4f599ba23881727a1e8880e9d60cc6a48.1519315352.git.alifm@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-14KVM: s390: fix fallthrough annotationSebastian Ott1-6/+3
A case statement in kvm_s390_shadow_tables uses fallthrough annotations which are not recognized by gcc because they are hidden within a block. Move these annotations out of the block to fix (W=1) warnings like below: arch/s390/kvm/gaccess.c: In function 'kvm_s390_shadow_tables': arch/s390/kvm/gaccess.c:1029:26: warning: this statement may fall through [-Wimplicit-fallthrough=] case ASCE_TYPE_REGION1: { ^ Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2018-03-14KVM: s390: add exit io request stats and simplify codeChristian Borntraeger3-13/+6
We want to count IO exit requests in kvm_stat. At the same time we can get rid of the handle_noop function. Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2018-03-10Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds1-0/+2
Pull KVM fixes from Radim Krčmář: "PPC: - Fix guest time accounting in the host - Fix large-page backing for radix guests on POWER9 - Fix HPT guests on POWER9 backed by 2M or 1G pages - Compile fixes for some configs and gcc versions s390: - Fix random memory corruption when running as guest2 (e.g. KVM in LPAR) and starting guest3 (e.g. nested KVM) with many CPUs - Export forgotten io interrupt delivery statistics counter" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: KVM: s390: fix memory overwrites when not using SCA entries KVM: PPC: Book3S HV: Fix guest time accounting with VIRT_CPU_ACCOUNTING_GEN KVM: PPC: Book3S HV: Fix VRMA initialization with 2MB or 1GB memory backing KVM: PPC: Book3S HV: Fix handling of large pages in radix page fault handler KVM: s390: provide io interrupt kvm_stat KVM: PPC: Book3S: Fix compile error that occurs with some gcc versions KVM: PPC: Fix compile error that occurs when CONFIG_ALTIVEC=n
2018-03-09KVM: s390: Refactor host cmma and pfmfi interpretation controlsJanosch Frank5-16/+18
use_cmma in kvm_arch means that the KVM hypervisor is allowed to use cmma, whereas use_cmma in the mm context means cmm has been used before. Let's rename the context one to uses_cmm, as the vm does use collaborative memory management but the host uses the cmm assist (interpretation facility). Also let's introduce use_pfmfi, so we can remove the pfmfi disablement when we activate cmma and rather not activate it in the first place. Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com> Message-Id: <1518779775-256056-2-git-send-email-frankja@linux.vnet.ibm.com> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2018-03-09KVM: s390: implement CPU model only facilitiesChristian Borntraeger3-21/+54
Some facilities should only be provided to the guest, if they are enabled by a CPU model. This allows us to avoid capabilities and to simply fall back to the cpumodel for deciding about a facility without enabling it for older QEMUs or QEMUs without a CPU model. Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2018-03-07Merge branch 'for-linus' of ↵Linus Torvalds3-6/+9
git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 fixes from Martin Schwidefsky: "Nine bug fixes for s390: - Three fixes for the expoline code, one of them is strictly speaking a cleanup but as it relates to code added with 4.16 I would like to include the patch. - Three timer related fixes in the common I/O layer - A fix for the handling of internal DASD request which could cause panics. - One correction in regard to the accounting of pud page tables vs. compat tasks. - The register scrubbing in entry.S caused spurious crashes, this is fixed now as well" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/entry.S: fix spurious zeroing of r0 s390: Fix runtime warning about negative pgtables_bytes s390: do not bypass BPENTER for interrupt system calls s390/cio: clear timer when terminating driver I/O s390/cio: fix return code after missing interrupt s390/cio: fix ccw_device_start_timeout API s390/clean-up: use CFI_* macros in entry.S s390: Replace IS_ENABLED(EXPOLINE_*) with IS_ENABLED(CONFIG_EXPOLINE_*) s390/dasd: fix handling of internal requests
2018-03-06KVM: Introduce paravirtualization hints and KVM_HINTS_DEDICATEDWanpeng Li1-0/+5
This patch introduces kvm_para_has_hint() to query for hints about the configuration of the guests. The first hint KVM_HINTS_DEDICATED, is set if the guest has dedicated physical CPUs for each vCPU (i.e. pinning and no over-commitment). This allows optimizing spinlocks and tells the guest to avoid PV TLB flush. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Wanpeng Li <wanpengli@tencent.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
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