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2017-04-25s390/mm: simplify arch_get_unmapped_area[_topdown]Martin Schwidefsky1-57/+32
With TASK_SIZE now reflecting the maximum size of the address space for a process the code for arch_get_unmapped_area[_topdown] can be simplified. Just let the logic pick a suitable address and deal with the page table upgrade after the address has been selected. Signed-off-by: Martin Schwidefsky <[email protected]>
2017-04-25s390/mm: make TASK_SIZE independent from the number of page table levelsMartin Schwidefsky7-33/+21
The TASK_SIZE for a process should be maximum possible size of the address space, 2GB for a 31-bit process and 8PB for a 64-bit process. The number of page table levels required for a given memory layout is a consequence of the mapped memory areas and their location. Signed-off-by: Martin Schwidefsky <[email protected]>
2017-04-24Merge tag 'vfio-ccw-20170413' of ↵Martin Schwidefsky2-33/+7
git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/vfio-ccw into features Pull vfio-ccw fixes from Cornelia Huck: Two fixes for the new vfio-ccw support.
2017-04-21s390/gs: add regset for the guarded storage broadcast control blockMartin Schwidefsky2-0/+47
The guarded storage interface allows to register a control block for each thread that is activated with the guarded storage broadcast event. To retrieve the complete state of a process from the kernel a register set for the stored broadcast control block is required. Signed-off-by: Martin Schwidefsky <[email protected]>
2017-04-20s390/kvm: Add use_cmma field to mm_context_tClaudio Imbrenda2-0/+3
Add use_cmma field to mm_context_t, like we do for storage keys. Signed-off-by: Claudio Imbrenda <[email protected]> Acked-by: Janosch Frank <[email protected]> Reviewed-by: Christian Borntraeger <[email protected]> Signed-off-by: Christian Borntraeger <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-04-20s390/kvm: Add PGSTE manipulation functionsClaudio Imbrenda4-6/+185
Add PGSTE manipulation functions: * set_pgste_bits sets specific bits in a PGSTE * get_pgste returns the whole PGSTE * pgste_perform_essa manipulates a PGSTE to set specific storage states * ESSA_[SG]ET_* macros used to indicate the action for manipulate_pgste Signed-off-by: Claudio Imbrenda <[email protected]> Reviewed-by: Janosch Frank <[email protected]> Reviewed-by: Christian Borntraeger <[email protected]> Signed-off-by: Christian Borntraeger <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-04-12vfio: ccw: improve error handling for vfio_ccw_mdev_removeDong Jia Shi1-11/+6
When vfio_ccw_mdev_reset fails during the remove process of the mdev, the current implementation simply returns. The failure indicates that the subchannel device is in a NOT_OPER state, thus the right thing to do should be removing the mdev. While we are at here, reverse the condition check to make the code more concise and readable. Signed-off-by: Dong Jia Shi <[email protected]> Message-Id: <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
2017-04-12vfio: ccw: remove unnecessary NULL checks of a pointerDong Jia Shi2-22/+1
Remove several unnecessary checks for the @private pointer, since it can never be NULL in these places. Reported-by: Dan Carpenter <[email protected]> Signed-off-by: Dong Jia Shi <[email protected]> Message-Id: <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
2017-04-12s390/spinlock: remove compare and delay instructionMartin Schwidefsky3-45/+13
The CAD instruction never worked quite as expected for the spinlock code. It has been disabled by default with git commit 61b0b01686d48220, if the "cad" kernel parameter is specified it is enabled for both user space and the spinlock code. Leave the option to enable the instruction for user space but remove it from the spinlock code. Signed-off-by: Martin Schwidefsky <[email protected]>
2017-04-12s390/spinlock: use atomic primitives for spinlocksMartin Schwidefsky4-76/+70
Add a couple more __atomic_xxx function to atomic_ops.h and use them to replace the compare-and-swap inlines in the spinlock code. This changes the type of the lock value from unsigned int to int. Signed-off-by: Martin Schwidefsky <[email protected]>
2017-04-05s390/cpumf: simplify detection of guest samplesMartin Schwidefsky3-9/+4
There are three different code levels in regard to the identification of guest samples. They differ in the way the LPP instruction is used. 1) Old kernels without the LPP instruction. The guest program parameter is always zero. 2) Newer kernels load the process pid into the program parameter with LPP. The guest program parameter is non-zero if the guest executes in a process != idle. 3) The latest kernels load ((1UL << 31) | pid) with LPP to make the value non-zero even for the idle task. The guest program parameter is non-zero if the guest is running. All kernels load the process pid to CR4 on context switch. The CPU sampling code uses the value in CR4 to decide between guest and host samples in case the guest program parameter is zero. The three cases: 1) CR4==pid, gpp==0 2) CR4==pid, gpp==pid 3) CR4==pid, gpp==((1UL << 31) | pid) The load-control instruction to load the pid into CR4 is expensive and the goal is to remove it. To distinguish the host CR4 from the guest pid for the idle process the maximum value 0xffff for the PASN is used. This adds a fourth case for a guest OS with an updated kernel: 4) CR4==0xffff, gpp=((1UL << 31) | pid) The host kernel will have CR4==0xffff and will use (gpp!=0 || CR4!==0xffff) to identify guest samples. This works nicely with all 4 cases, the only possible issue would be a guest with an old kernel (gpp==0) and a process pid of 0xffff. Well, don't do that.. Suggested-by: Christian Borntraeger <[email protected]> Reviewed-by: Christian Borntraeger <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-04-05s390/pci: remove forward declarationSebastian Ott1-8/+5
Move a struct definition to get rid of a forward declaration. Signed-off-by: Sebastian Ott <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-04-05s390/pci: increase the PCI_NR_FUNCTIONS defaultSebastian Ott1-1/+1
Users complained that they are hitting the limit of 64 functions (some physical functions can spawn lots of virtual functions). Double the default limit. With the latest savings in static data usage this increases the image size by only 520 bytes. Signed-off-by: Sebastian Ott <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-04-05s390/pci: reduce iomap size (even more)Sebastian Ott1-1/+1
Commit c506fff3d3a8 ("s390/pci: resize iomap") reduced the iomap to NR_FUNCTIONS * PCI_BAR_COUNT elements. Since we only support functions with 64bit BARs we can cut that number in half. Signed-off-by: Sebastian Ott <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-04-05s390/pci: remove duplicated defineSebastian Ott1-2/+0
Address space identifiers are already defined in <asm/pci_insn.h>. Signed-off-by: Sebastian Ott <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-04-05s390/pci: remove unused functionSebastian Ott1-5/+0
barsize was never used. Get rid of it. Signed-off-by: Sebastian Ott <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-04-05s390: use 64-bit lctlg to load task pid to cr4 on context switchMartin Schwidefsky1-1/+3
The 32-bit lctl instruction is quite a bit slower than the 64-bit counter part lctlg. Use the faster instruction. Signed-off-by: Martin Schwidefsky <[email protected]>
2017-03-31Merge branch 'vfio-ccw-for-martin' of ↵Martin Schwidefsky19-46/+2417
git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/vfio-ccw into features Pull vfio-ccw branch to add the basic channel I/O passthrough intrastructure based on vfio. The focus is on supporting dasd-eckd(cu_type/dev_type = 0x3990/0x3390) as the target device. Signed-off-by: Martin Schwidefsky <[email protected]>
2017-03-31MAINTAINERS: Add vfio-ccw maintainersDong Jia Shi1-0/+10
Add Cornelia Huck and myself as the vfio-ccw driver maintainers. Signed-off-by: Dong Jia Shi <[email protected]> Message-Id: <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
2017-03-31vfio: ccw: introduce support for ccw0Dong Jia Shi2-3/+47
Although Linux does not use format-0 channel command words (CCW0) these are a non-optional part of the platform spec, and for the sake of platform compliance, and possibly some non-Linux guests, we have to support CCW0. Making the kernel execute a format 0 channel program is too much hassle because we would need to allocate and use memory which can be addressed by 24 bit physical addresses (because of CCW0.cda). So we implement CCW0 support by translating the channel program into an equivalent CCW1 program instead. Based upon an orginal patch by Kai Yue Wang. Signed-off-by: Dong Jia Shi <[email protected]> Message-Id: <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
2017-03-31docs: add documentation for vfio-ccwDong Jia Shi2-0/+305
Add file Documentation/s390/vfio-ccw.txt that includes details of vfio-ccw. Acked-by: Pierre Morel <[email protected]> Signed-off-by: Dong Jia Shi <[email protected]> Message-Id: <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
2017-03-31vfio: ccw: introduce a finite state machineDong Jia Shi5-107/+287
The current implementation doesn't check if the subchannel is in a proper device state when handling an event. Let's introduce a finite state machine to manage the state/event change. Signed-off-by: Dong Jia Shi <[email protected]> Message-Id: <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
2017-03-31vfio: ccw: return I/O results asynchronouslyDong Jia Shi3-31/+37
Introduce a singlethreaded workqueue to handle the I/O interrupts. With the work added to this queue, we store the I/O results to the io_region of the subchannel, then signal the userspace program to handle the results. Signed-off-by: Dong Jia Shi <[email protected]> Message-Id: <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
2017-03-31vfio: ccw: realize VFIO_DEVICE_G(S)ET_IRQ_INFO ioctlsDong Jia Shi3-3/+134
Realize VFIO_DEVICE_GET_IRQ_INFO ioctl to retrieve VFIO_CCW_IO_IRQ information. Realize VFIO_DEVICE_SET_IRQS ioctl to set an eventfd fd for VFIO_CCW_IO_IRQ. Once a write operation to the ccw_io_region was performed, trigger a signal on this fd. Reviewed-by: Pierre Morel <[email protected]> Signed-off-by: Dong Jia Shi <[email protected]> Acked-by: Alex Williamson <[email protected]> Message-Id: <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
2017-03-31vfio: ccw: realize VFIO_DEVICE_RESET ioctlDong Jia Shi1-14/+33
Introduce VFIO_DEVICE_RESET ioctl for vfio-ccw to make it possible to hot-reset the device. We try to achieve a reset by first disabling the subchannel and then enabling it again: this should clear all state at the subchannel. Signed-off-by: Dong Jia Shi <[email protected]> Message-Id: <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
2017-03-31vfio: ccw: realize VFIO_DEVICE_GET_REGION_INFO ioctlDong Jia Shi2-0/+89
Introduce device information about vfio-ccw: VFIO_DEVICE_FLAGS_CCW. Realize VFIO_DEVICE_GET_REGION_INFO ioctl for vfio-ccw. Reviewed-by: Pierre Morel <[email protected]> Signed-off-by: Dong Jia Shi <[email protected]> Acked-by: Alex Williamson <[email protected]> Message-Id: <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
2017-03-31vfio: ccw: handle ccw command requestDong Jia Shi3-4/+148
We implement the basic ccw command handling infrastructure here: 1. Translate the ccw commands. 2. Issue the translated ccw commands to the device. 3. Once we get the execution result, update the guest SCSW with it. Acked-by: Pierre Morel <[email protected]> Signed-off-by: Dong Jia Shi <[email protected]> Message-Id: <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
2017-03-31vfio: ccw: introduce ccw_io_regionDong Jia Shi3-0/+75
To provide user-space a set of interfaces to: 1. pass in a ccw program to perform an I/O operation. 2. read back I/O results of the completed I/O operations. We introduce an MMIO region for the vfio-ccw device here. This region is defined to content: 1. areas to store arguments that an ssch required. 2. areas to store the I/O results. Using pwrite/pread to the device on this region, a user-space program could write/read data to/from the vfio-ccw device. Reviewed-by: Pierre Morel <[email protected]> Signed-off-by: Dong Jia Shi <[email protected]> Message-Id: <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
2017-03-31vfio: ccw: register vfio_ccw to the mediated device frameworkDong Jia Shi5-3/+171
To make vfio support subchannel devices, we need to leverage the mediated device framework to create a mediated device for the subchannel device. This registers the subchannel device to the mediated device framework during probe to enable mediated device creation. Reviewed-by: Pierre Morel <[email protected]> Signed-off-by: Dong Jia Shi <[email protected]> Message-Id: <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
2017-03-31vfio: ccw: introduce channel program interfacesDong Jia Shi3-1/+859
Introduce ccwchain structure and helper functions that can be used to handle a channel program issued from a virtual machine. The following limitations apply: 1. Supports only prefetch enabled mode. 2. Supports idal(c64) ccw chaining. 3. Supports 4k idaw. 4. Supports ccw1. 5. Supports direct ccw chaining by translating them to idal ccws. CCW translation requires to leverage the vfio_(un)pin_pages interfaces to pin/unpin sets of mem pages frequently. Currently we have a lack of support to do this in an efficient way. So we introduce pfn_array data structure and helper functions to handle pin/unpin operations here. Signed-off-by: Dong Jia Shi <[email protected]> Message-Id: <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
2017-03-31vfio: ccw: basic implementation for vfio_ccw driverDong Jia Shi6-0/+309
To make vfio support subchannel devices, we need a css driver for the vfio subchannels. This patch adds a basic vfio-ccw subchannel driver for this purpose. To enable VFIO for vfio-ccw, enable S390_CCW_IOMMU config option and configure VFIO as required. Acked-by: Pierre Morel <[email protected]> Signed-off-by: Dong Jia Shi <[email protected]> Message-Id: <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
2017-03-31vfio: ccw: define device_api stringsDong Jia Shi1-0/+1
Define vfio-ccw device API strings. CCW vendor driver using mediated device framework should use this string for device_api attribute. Reviewed-by: Pierre Morel <[email protected]> Signed-off-by: Dong Jia Shi <[email protected]> Acked-by: Alex Williamson <[email protected]> Message-Id: <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
2017-03-31s390: cio: export more interfacesDong Jia Shi1-0/+10
Export the common I/O interfaces those are needed by an I/O subchannel driver to actually talk to the subchannel. Reviewed-by: Pierre Morel <[email protected]> Signed-off-by: Dong Jia Shi <[email protected]> Cc: Sebastian Ott <[email protected]> Cc: Peter Oberparleiter <[email protected]> Acked-by: Sebastian Ott <[email protected]> Message-Id: <[email protected]> Signed-off-by: Cornelia Huck <[email protected]>
2017-03-31s390: cio: introduce cio_cancel_halt_clearDong Jia Shi3-46/+68
For future code reuse purpose, this decouples the cio code with the ccw device specific parts from ccw_device_cancel_halt_clear, and makes a new common I/O interface named cio_cancel_halt_clear. Reviewed-by: Pierre Morel <[email protected]> Signed-off-by: Dong Jia Shi <[email protected]> Cc: Sebastian Ott <[email protected]> Cc: Peter Oberparleiter <[email protected]> Acked-by: Sebastian Ott <[email protected]> Message-Id: <[email protected]> [CH: Fix typo] Signed-off-by: Cornelia Huck <[email protected]>
2017-03-31s390/cpum_cf: make hw_perf_event_update() a void functionHendrik Brueckner1-4/+2
The return code of hw_perf_event_update() is not evaluated by its callers. Hence, simplify the function by removing the return code. Reported-by: Heiko Carstens <[email protected]> Signed-off-by: Hendrik Brueckner <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-03-31s390/cpu_mf: remove register variable in __ecctr()Hendrik Brueckner1-1/+1
Using a register variable for r4 is not necessary. Let the compiler decide the register to be used. Reported-by: Heiko Carstens <[email protected]> Signed-off-by: Hendrik Brueckner <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-03-31s390/cpum_cf: correct variable naming (cleanup)Hendrik Brueckner1-9/+9
Make clear that the event definitions relate to the counter facility (cf) and not to the sampling facility (sf). Signed-off-by: Hendrik Brueckner <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-03-31s390/cpum_cf: add IBM z13 counter event namesHendrik Brueckner1-7/+123
Add the event names for the IBM z13/z13s specific CPU-MF counters. Also improve the merging of the generic and model specific events so that their sysfs attribute definitions completely reside in memory. Hence, flagging the generic event attribute definitions as initdata too. Signed-off-by: Hendrik Brueckner <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-03-31s390/cpum_cf: add support for the MT-diagnostic counter set (z13)Hendrik Brueckner2-26/+67
Complete the IBM z13 support and support counters from the MT-diagnostic counter set. Note that this counter set is available only if SMT is enabled. Signed-off-by: Hendrik Brueckner <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-03-31s390/cpum_cf: cleanup event/counter validationHendrik Brueckner1-30/+1
The validate_event() function just checked for reserved counters in particular CPU-MF counter sets. Because the number of counters in counter sets vary among different hardware models, remove the explicit check to tolerate new models. Reserved counters are not accounted and, thus, will return zero. Signed-off-by: Hendrik Brueckner <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-03-31s390/cpum_cf: update counter numbers to ecctr limitsHendrik Brueckner2-3/+3
Use the highest counter number that can be specified for the ecctr (extract CPU counter) instruction for perf. Signed-off-by: Hendrik Brueckner <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-03-30s390: use generic headers if possibleHeiko Carstens7-16/+6
Signed-off-by: Heiko Carstens <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-03-30s390/uapi: use generic headers if possibleHeiko Carstens10-59/+10
Signed-off-by: Heiko Carstens <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-03-28s390: make MAX_PHYSMEM_BITS configurableHeiko Carstens2-1/+11
Signed-off-by: Heiko Carstens <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-03-28s390: enable ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INITHeiko Carstens4-0/+4
Deferred struct page initialization works on s390. However it makes only sense for the fake numa case, since the kthreads that initialize struct pages are started per node. Without fake numa there is just a single node and therefore no gain. However there is no reason to not enable this feature. Therefore select the config option and enable the feature in all config files. Signed-off-by: Heiko Carstens <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-03-28s390/MAINTAINERS: add gmap.c to kvm maintainersChristian Borntraeger1-0/+1
gmap.c deals mostly with KVM-related memory management, so a lot of changes to this file will come via the KVM tree. Reflect this in MAINTAINERS. Please note that there are intricate ties to arch/s390/mm/pgtable.c. If changes are needed in both files, this will continue to be submitted via the s390 tree (or a topic branch if necessary). Signed-off-by: Christian Borntraeger <[email protected]> Acked-by: Cornelia Huck <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-03-28s390/kdump: Add final noteMichael Holzheu1-0/+15
Since linux v3.14 with commit 38dfac843cb6d7be1 ("vmcore: prevent PT_NOTE p_memsz overflow during header update") on s390 we get the following message in the kdump kernel: Warning: Exceeded p_memsz, dropping PT_NOTE entry n_namesz=0x6b6b6b6b, n_descsz=0x6b6b6b6b The reason for this is that we don't create a final zero note in the ELF header which the proc/vmcore code uses to find out the end of the notes section (see also kernel/kexec_core.c:final_note()). It still worked on s390 by chance because we (most of the time?) have the byte pattern 0x6b6b6b6b after the notes section which also makes the notes parsing code stop in update_note_header_size_elf64() because 0x6b6b6b6b is interpreded as note size: if ((real_sz + sz) > max_sz) { pr_warn("Warning: Exceeded p_memsz, dropping P ...); break; } So fix this and add the missing final note to the ELF header. We don't have to adjust the memory size for ELF header ("alloc_size") because the new ELF note still fits into the 0x1000 base memory. Cc: [email protected] # v4.4+ Signed-off-by: Michael Holzheu <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-03-28s390: remove HAVE_ARCH_EARLY_PFN_TO_NID select statementHeiko Carstens1-1/+0
HAVE_ARCH_EARLY_PFN_TO_NID selects a not present Kconfig option. Therefore remove it. Given that the first call of early_pfn_to_nid() happens after numa_setup() finished to establish the memory to node mapping, there is no need to implement an architecture private version of __early_pfn_to_nid() like (only) ia64 does. Signed-off-by: Heiko Carstens <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-03-28s390/dasd: suppress command reject error for query host access commandStefan Haberland3-6/+13
On some z/VM systems the query host access command is not supported for temp disks, though the corresponding feature code is set. This does not have any impact beside that the information is not available. Suppress the full blown command reject error messages to not confuse the user. The error is still logged in the s390dbf. Signed-off-by: Stefan Haberland <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
2017-03-28s390/dasd: check if query host access feature is supportedStefan Haberland1-0/+4
Some storage servers might not support the query host access feature. Check if the corresponding feature code is set. Signed-off-by: Stefan Haberland <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
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