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2020-06-02Merge remote-tracking branch ↵Peter Maydell
'remotes/ehabkost/tags/machine-next-pull-request' into staging machine queue, 2020-05-13 Bug fixes: * hostmem: don't use mbind() if host-nodes is empty (Igor Mammedov) # gpg: Signature made Wed 13 May 2020 15:00:25 BST # gpg: using RSA key 5A322FD5ABC4D3DBACCFD1AA2807936F984DC5A6 # gpg: issuer "ehabkost@redhat.com" # gpg: Good signature from "Eduardo Habkost <ehabkost@redhat.com>" [full] # Primary key fingerprint: 5A32 2FD5 ABC4 D3DB ACCF D1AA 2807 936F 984D C5A6 * remotes/ehabkost/tags/machine-next-pull-request: hostmem: don't use mbind() if host-nodes is empty Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2020-05-15qom: Drop parameter @errp of object_property_add() & friendsMarkus Armbruster
The only way object_property_add() can fail is when a property with the same name already exists. Since our property names are all hardcoded, failure is a programming error, and the appropriate way to handle it is passing &error_abort. Same for its variants, except for object_property_add_child(), which additionally fails when the child already has a parent. Parentage is also under program control, so this is a programming error, too. We have a bit over 500 callers. Almost half of them pass &error_abort, slightly fewer ignore errors, one test case handles errors, and the remaining few callers pass them to their own callers. The previous few commits demonstrated once again that ignoring programming errors is a bad idea. Of the few ones that pass on errors, several violate the Error API. The Error ** argument must be NULL, &error_abort, &error_fatal, or a pointer to a variable containing NULL. Passing an argument of the latter kind twice without clearing it in between is wrong: if the first call sets an error, it no longer points to NULL for the second call. ich9_pm_add_properties(), sparc32_ledma_realize(), sparc32_dma_realize(), xilinx_axidma_realize(), xilinx_enet_realize() are wrong that way. When the one appropriate choice of argument is &error_abort, letting users pick the argument is a bad idea. Drop parameter @errp and assert the preconditions instead. There's one exception to "duplicate property name is a programming error": the way object_property_add() implements the magic (and undocumented) "automatic arrayification". Don't drop @errp there. Instead, rename object_property_add() to object_property_try_add(), and add the obvious wrapper object_property_add(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20200505152926.18877-15-armbru@redhat.com> [Two semantic rebase conflicts resolved]
2020-05-15qom: Drop object_property_set_description() parameter @errpMarkus Armbruster
object_property_set_description() and object_class_property_set_description() fail only when property @name is not found. There are 85 calls of object_property_set_description() and object_class_property_set_description(). None of them can fail: * 84 immediately follow the creation of the property. * The one in spapr_rng_instance_init() refers to a property created in spapr_rng_class_init(), from spapr_rng_properties[]. Every one of them still gets to decide what to pass for @errp. 51 calls pass &error_abort, 32 calls pass NULL, one receives the error and propagates it to &error_abort, and one propagates it to &error_fatal. I'm actually surprised none of them violates the Error API. What are we gaining by letting callers handle the "property not found" error? Use when the property is not known to exist is simpler: you don't have to guard the call with a check. We haven't found such a use in 5+ years. Until we do, let's make life a bit simpler and drop the @errp parameter. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20200505152926.18877-8-armbru@redhat.com> [One semantic rebase conflict resolved]
2020-05-12hostmem: don't use mbind() if host-nodes is emptyIgor Mammedov
Since 5.0 QEMU uses hostmem backend for allocating main guest RAM. The backend however calls mbind() which is typically NOP in case of default policy/absent host-nodes bitmap. However when runing in container with black-listed mbind() syscall, QEMU fails to start with error "cannot bind memory to host NUMA nodes: Operation not permitted" even when user hasn't provided host-nodes to pin to explictly (which is the case with -m option) To fix issue, call mbind() only in case when user has provided host-nodes explicitly (i.e. host_nodes bitmap is not empty). That should allow to run QEMU in containers with black-listed mbind() without memory pinning. If QEMU provided memory-pinning is required user still has to white-list mbind() in container configuration. Reported-by: Manuel Hohmann <mhohmann@physnet.uni-hamburg.de> Signed-off-by: Igor Mammedov <imammedo@redhat.com> Message-Id: <20200430154606.6421-1-imammedo@redhat.com> Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com> Cc: qemu-stable@nongnu.org Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2020-04-14hostmem: set default prealloc_threads to valid valueIgor Mammedov
Commit 4ebc74dbbf removed default prealloc_threads initialization by mistake, and that makes QEMU crash with division on zero at numpages_per_thread = numpages / memset_num_threads; when QEMU is started with following backend -object memory-backend-ram,id=ram-node0,prealloc=yes,size=128M Return back initialization removed by 4ebc74dbbf to fix issue. Fixes: 4ebc74dbbf7ad50e4101629f3f5da5fdc1544051 Reported-by: Raphael Norwitz <raphael.norwitz@nutanix.com> Signed-off-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Laurent Vivier <lvivier@redhat.com> Message-Id: <20200325094423.24293-2-imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-02-19hostmem: fix strict bind policyIgor Mammedov
When option -mem-prealloc is used with one or more memory-backend objects, created backends may not obey configured bind policy or creation may fail after kernel attempts to move pages according to bind policy. Reason is in file_ram_alloc(), which will pre-allocate any descriptor based RAM if global mem_prealloc != 0 and that happens way before bind policy is applied to memory range. One way to fix it would be to extend memory_region_foo() API and add more invariants that could broken later due implicit dependencies that's hard to track. Another approach is to drop adhoc main RAM allocation and consolidate it around memory-backend. That allows to have single place that allocates guest RAM (main and memdev) in the same way and then global mem_prealloc could be replaced by backend's property[s] that will affect created memory-backend objects but only in correct order this time. With main RAM now converted to hostmem backends, there is no point in keeping global mem_prealloc around, so alias -mem-prealloc to "memory-backend.prealloc=on" machine compat[*] property and make mem_prealloc a local variable to only stir registration of compat property. *) currently user accessible -global works only with DEVICE based objects and extra work is needed to make it work with hostmem backends. But that is convenience option and out of scope of this already huge refactoring. Hence machine compat properties were used. Signed-off-by: Igor Mammedov <imammedo@redhat.com> Message-Id: <20200219160953.13771-78-imammedo@redhat.com>
2020-02-19hostmem: introduce "prealloc-threads" propertyIgor Mammedov
the property will allow user to specify number of threads to use in pre-allocation stage. It also will allow to reduce implicit hostmem dependency on current_machine. On object creation it will default to 1, but via machine compat property it will be updated to MachineState::smp::cpus to keep current behavior for hostmem and main RAM (which is now also hostmem based). Signed-off-by: Igor Mammedov <imammedo@redhat.com> Message-Id: <20200219160953.13771-77-imammedo@redhat.com>
2019-10-26core: replace getpagesize() with qemu_real_host_page_sizeWei Yang
There are three page size in qemu: real host page size host page size target page size All of them have dedicate variable to represent. For the last two, we use the same form in the whole qemu project, while for the first one we use two forms: qemu_real_host_page_size and getpagesize(). qemu_real_host_page_size is defined to be a replacement of getpagesize(), so let it serve the role. [Note] Not fully tested for some arch or device. Signed-off-by: Wei Yang <richardw.yang@linux.intel.com> Message-Id: <20191013021145.16011-3-richardw.yang@linux.intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2019-08-16Include sysemu/sysemu.h a lot lessMarkus Armbruster
In my "build everything" tree, changing sysemu/sysemu.h triggers a recompile of some 5400 out of 6600 objects (not counting tests and objects that don't depend on qemu/osdep.h). hw/qdev-core.h includes sysemu/sysemu.h since recent commit e965ffa70a "qdev: add qdev_add_vm_change_state_handler()". This is a bad idea: hw/qdev-core.h is widely included. Move the declaration of qdev_add_vm_change_state_handler() to sysemu/sysemu.h, and drop the problematic include from hw/qdev-core.h. Touching sysemu/sysemu.h now recompiles some 1800 objects. qemu/uuid.h also drops from 5400 to 1800. A few more headers show smaller improvement: qemu/notify.h drops from 5600 to 5200, qemu/timer.h from 5600 to 4500, and qapi/qapi-types-run-state.h from 5500 to 5000. Cc: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-Id: <20190812052359.30071-28-armbru@redhat.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
2019-07-05general: Replace global smp variables with smp machine propertiesLike Xu
Basically, the context could get the MachineState reference via call chains or unrecommended qdev_get_machine() in !CONFIG_USER_ONLY mode. A local variable of the same name would be introduced in the declaration phase out of less effort OR replace it on the spot if it's only used once in the context. No semantic changes. Signed-off-by: Like Xu <like.xu@linux.intel.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-Id: <20190518205428.90532-4-like.xu@linux.intel.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2019-03-06hostmem: fix crash when querying empty host-nodes property via QMPIgor Mammedov
QEMU will crashes with qapi/qobject-output-visitor.c:210: qobject_output_complete: Assertion `qov->root && ((&qov->stack)->slh_first == ((void *)0))' failed when trying to get value of not set hostmem's "host-nodes" property, HostMemoryBackend::host_nodes bitmap doesn't have any bits set in it, which leads to find_first_bit() returning MAX_NODES and consequently to an early return from host_memory_backend_get_host_nodes() without calling visitor. Fix it by calling visitor even if "host-nodes" property wasn't set before exiting from property getter to return valid empty list. Signed-off-by: Igor Mammedov <imammedo@redhat.com> Message-Id: <20190214105733.25643-1-imammedo@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2019-01-28hostmem: add more information in error messagesZhang Yi
When there are multiple memory backends in use, including the object type and property name in the error message can help users to locate the error. Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com> Signed-off-by: Zhang Yi <yi.z.zhang@linux.intel.com> Message-Id: <97d9193875747d8378c05b9e3b3cb39c1b7d2b4e.1546399191.git.yi.z.zhang@linux.intel.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> [ehabkost: reword commit message] Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2019-01-07hostmem: use object id for memory region name with >= 4.0Marc-André Lureau
hostmem-file and hostmem-memfd use the whole object path for the memory region name, and hostname-ram uses only the path component (the object id, or canonical path basename): qemu -m 1024 -object memory-backend-file,id=mem,size=1G,mem-path=/tmp/foo -numa node,memdev=mem -monitor stdio (qemu) info ramblock Block Name PSize Offset Used Total /objects/mem 4 KiB 0x0000000000000000 0x0000000040000000 0x0000000040000000 qemu -m 1024 -object memory-backend-memfd,id=mem,size=1G -numa node,memdev=mem -monitor stdio (qemu) info ramblock Block Name PSize Offset Used Total /objects/mem 4 KiB 0x0000000000000000 0x0000000040000000 0x0000000040000000 qemu -m 1024 -object memory-backend-ram,id=mem,size=1G -numa node,memdev=mem -monitor stdio (qemu) info ramblock Block Name PSize Offset Used Total mem 4 KiB 0x0000000000000000 0x0000000040000000 0x0000000040000000 For consistency, change to use object id for -file and -memfd as well with >= 4.0. Having a consistent naming allows to migrate to different hostmem backends. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Igor Mammedov <imammedo@redhat.com> Acked-by: Eduardo Habkost <ehabkost@redhat.com>
2018-12-11hostmem: Validate host-nodes before setting bitmapEduardo Habkost
host_memory_backend_set_host_nodes() was not validating host-nodes before writing to backend->host_nodes, making QEMU write beyond the end of the bitmap. Fix the crash and add a simple regression test for the fix. While at it, fix memory leak of the list returned by visit_type_uint16List(). Reported-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Message-Id: <20181130122844.29103-1-ehabkost@redhat.com> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Igor Mammedov <imammedo@redhat.com> [ehabkost: removed test case code] Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2018-10-05hostmem: add some properties descriptionMarc-André Lureau
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
2018-06-28hostmem: drop error variable from host_memory_backend_get_memory()David Hildenbrand
Unused, so let's remove it. Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20180619134141.29478-8-david@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-05-09memdev: remove "id" propertyPaolo Bonzini
The "id" property is unnecessary and can be replaced simply with object_get_canonical_path_component. This patch mostly undoes commit e1ff3c67e8 ("monitor: fix qmp/hmp query-memdev not reporting IDs of memory backends", 2017-01-12). Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-04-27Add host_memory_backend_pagesize() helperDavid Gibson
There are a couple places (one generic, one target specific) where we need to get the host page size associated with a particular memory backend. I have some upcoming code which will add another place which wants this. So, for convenience, add a helper function to calculate this. host_memory_backend_pagesize() returns the host pagesize for a given HostMemoryBackend object. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Greg Kurz <groug@kaod.org> Acked-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-02qapi: Move qapi-schema.json to qapi/, rename generated filesMarkus Armbruster
Move qapi-schema.json to qapi/, so it's next to its modules, and all files get generated to qapi/, not just the ones generated for modules. Consistently name the generated files qapi-MODULE.EXT: qmp-commands.[ch] become qapi-commands.[ch], qapi-event.[ch] become qapi-events.[ch], and qmp-introspect.[ch] become qapi-introspect.[ch]. This gets rid of the temporary hacks in scripts/qapi/commands.py, scripts/qapi/events.py, and scripts/qapi/common.py. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20180211093607.27351-28-armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> [eblake: Fix trailing dot in tpm.c, undo temporary hack for OSX toolchain] Signed-off-by: Eric Blake <eblake@redhat.com>
2018-03-02Include less of the generated modular QAPI headersMarkus Armbruster
In my "build everything" tree, a change to the types in qapi-schema.json triggers a recompile of about 4800 out of 5100 objects. The previous commit split up qmp-commands.h, qmp-event.h, qmp-visit.h, qapi-types.h. Each of these headers still includes all its shards. Reduce compile time by including just the shards we actually need. To illustrate the benefits: adding a type to qapi/migration.json now recompiles some 2300 instead of 4800 objects. The next commit will improve it further. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20180211093607.27351-24-armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> [eblake: rebase to master] Signed-off-by: Eric Blake <eblake@redhat.com>
2018-02-19mem: add share parameter to memory-backend-ramMarcel Apfelbaum
Currently only file backed memory backend can be created with a "share" flag in order to allow sharing guest RAM with other processes in the host. Add the "share" flag also to RAM Memory Backend in order to allow remapping parts of the guest RAM to different host virtual addresses. This is needed by the RDMA devices in order to remap non-contiguous QEMU virtual addresses to a contiguous virtual address range. Moved the "share" flag to the Host Memory base class, modified phys_mem_alloc to include the new parameter and a new interface memory_region_init_ram_shared_nomigrate. There are no functional changes if the new flag is not used. Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
2018-02-09Drop superfluous includes of qapi-types.h and test-qapi-types.hMarkus Armbruster
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20180201111846.21846-4-armbru@redhat.com>
2017-09-04Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2017-09-01-v3' ↵Peter Maydell
into staging QAPI patches for 2017-09-01 # gpg: Signature made Mon 04 Sep 2017 12:30:31 BST # gpg: using RSA key 0x3870B400EB918653 # gpg: Good signature from "Markus Armbruster <armbru@redhat.com>" # gpg: aka "Markus Armbruster <armbru@pond.sub.org>" # Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867 4E5F 3870 B400 EB91 8653 * remotes/armbru/tags/pull-qapi-2017-09-01-v3: (47 commits) qapi: drop the sentinel in enum array qapi: Change data type of the FOO_lookup generated for enum FOO qapi: Convert indirect uses of FOO_lookup[...] to qapi_enum_lookup() qapi: Mechanically convert FOO_lookup[...] to FOO_str(...) qapi: Generate FOO_str() macro for QAPI enum FOO qapi: Avoid unnecessary use of enum lookup table's sentinel qapi: Use qapi_enum_parse() in input_type_enum() crypto: Use qapi_enum_parse() in qcrypto_block_luks_name_lookup() quorum: Use qapi_enum_parse() in quorum_open() block: Use qemu_enum_parse() in blkdebug_debug_breakpoint() hmp: Use qapi_enum_parse() in hmp_migrate_set_parameter() hmp: Use qapi_enum_parse() in hmp_migrate_set_capability() tpm: Clean up model registration & lookup tpm: Clean up driver registration & lookup qapi: Drop superfluous qapi_enum_parse() parameter max qapi: Update qapi-code-gen.txt examples to match current code qapi-schema: Improve section headings qapi-schema: Move queries from common.json to qapi-schema.json qapi-schema: Make block-core.json self-contained qapi-schema: Fold event.json back into qapi-schema.json ... Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2017-09-04qapi: Change data type of the FOO_lookup generated for enum FOOMarc-André Lureau
Currently, a FOO_lookup is an array of strings terminated by a NULL sentinel. A future patch will generate enums with "holes". NULL-termination will cease to work then. To prepare for that, store the length in the FOO_lookup by wrapping it in a struct and adding a member for the length. The sentinel will be dropped next. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20170822132255.23945-13-marcandre.lureau@redhat.com> [Basically redone] Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <1503564371-26090-16-git-send-email-armbru@redhat.com> [Rebased]
2017-09-04qapi: Mechanically convert FOO_lookup[...] to FOO_str(...)Markus Armbruster
Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <1503564371-26090-14-git-send-email-armbru@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
2017-09-01qom: Remove unused errp parameter from can_be_deleted()Eduardo Habkost
The errp argument is ignored by all implementations of the method, and user_creatable_del() would break if any implementation set an error (because it calls error_setg(errp) if the function returns false). Remove the unused parameter. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Message-Id: <20170829220337.23427-1-ehabkost@redhat.com> Reviewed-by: Gonglei <arei.gonglei@huawei.com> Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2017-04-20hostmem: use host_memory_backend_mr_inited() where properPeter Xu
Use the new interface to boost readability. Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <1489151370-15453-3-git-send-email-peterx@redhat.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2017-04-20hostmem: introduce host_memory_backend_mr_inited()Peter Xu
We were checking this against memory region size of host memory backend's mr field to see whether the mr has been inited. This is efficient but less elegant. Let's make a helper for it to avoid confusions, along with some notes. Suggested-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <1489151370-15453-2-git-send-email-peterx@redhat.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2017-03-21Revert "hostmem: fix QEMU crash by 'info memdev'"Markus Armbruster
This reverts commit 1454d33f0507cb54d62ed80f494884157c9e7130. The string input visitor regression fixed in the previous commit made visit_type_uint16List() fail on empty input. query_memdev() calls it via object_property_get_uint16List(). Because it doesn't expect it to fail, it passes &error_abort, and duly crashes. Commit 1454d33 "fixes" this crash by making host_memory_backend_get_host_nodes() return a list containing just MAX_NODES instead of the empty list. Papers over the regression, and leads to bogus "info memdev" output, as shown below; revert. I suspect that if we had bisected the crash back then, we would have found and fixed the actual bug instead of papering over it. To reproduce, run HMP command "info memdev" with $ qemu-system-x86_64 --nodefaults -S -display none -monitor stdio -object memory-backend-ram,id=mem1,size=4k With this commit, "info memdev" prints memory backend: mem1 size: 4096 merge: true dump: true prealloc: false policy: default host nodes: exactly like before commit 74f24cb. Between commit 1454d33 and this commit, it prints memory backend: mem1 size: 4096 merge: true dump: true prealloc: false policy: default host nodes: 128 The last line is bogus. Between commit 74f24cb and 1454d33, it crashes like this: Unexpected error in parse_str() at /work/armbru/tmp/qemu/qapi/string-input-visitor.c:126: Parameter 'null' expects an int64 value or range Aborted (core dumped) Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <1490026424-11330-3-git-send-email-armbru@redhat.com> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2017-03-14mem-prealloc: reduce large guest start-up and migration time.Jitendra Kolhe
Using "-mem-prealloc" option for a large guest leads to higher guest start-up and migration time. This is because with "-mem-prealloc" option qemu tries to map every guest page (create address translations), and make sure the pages are available during runtime. virsh/libvirt by default, seems to use "-mem-prealloc" option in case the guest is configured to use huge pages. The patch tries to map all guest pages simultaneously by spawning multiple threads. Currently limiting the change to QEMU library functions on POSIX compliant host only, as we are not sure if the problem exists on win32. Below are some stats with "-mem-prealloc" option for guest configured to use huge pages. ------------------------------------------------------------------------ Idle Guest | Start-up time | Migration time ------------------------------------------------------------------------ Guest stats with 2M HugePage usage - single threaded (existing code) ------------------------------------------------------------------------ 64 Core - 4TB | 54m11.796s | 75m43.843s 64 Core - 1TB | 8m56.576s | 14m29.049s 64 Core - 256GB | 2m11.245s | 3m26.598s ------------------------------------------------------------------------ Guest stats with 2M HugePage usage - map guest pages using 8 threads ------------------------------------------------------------------------ 64 Core - 4TB | 5m1.027s | 34m10.565s 64 Core - 1TB | 1m10.366s | 8m28.188s 64 Core - 256GB | 0m19.040s | 2m10.148s ----------------------------------------------------------------------- Guest stats with 2M HugePage usage - map guest pages using 16 threads ----------------------------------------------------------------------- 64 Core - 4TB | 1m58.970s | 31m43.400s 64 Core - 1TB | 0m39.885s | 7m55.289s 64 Core - 256GB | 0m11.960s | 2m0.135s ----------------------------------------------------------------------- Changed in v2: - modify number of memset threads spawned to min(smp_cpus, 16). - removed 64GB memory restriction for spawning memset threads. Changed in v3: - limit number of threads spawned based on min(sysconf(_SC_NPROCESSORS_ONLN), 16, smp_cpus) - implement memset thread specific siglongjmp in SIGBUS signal_handler. Changed in v4 - remove sigsetjmp/siglongjmp and SIGBUS unblock/block for main thread as main thread no longer touches any pages. - simplify code my returning memset_thread_failed status from touch_all_pages. Signed-off-by: Jitendra Kolhe <jitendra.kolhe@hpe.com> Message-Id: <1487907103-32350-1-git-send-email-jitendra.kolhe@hpe.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-12monitor: fix qmp/hmp query-memdev not reporting IDs of memory backendsIgor Mammedov
Considering 'id' is mandatory for user_creatable objects/backends and user_creatable_add_type() always has it as an argument regardless of where from it is called CLI/monitor or QMP, Fix issue by adding 'id' property to hostmem backends and set it in user_creatable_add_type() for every object that implements 'id' property. Then later at query-memdev time get 'id' from object directly. Signed-off-by: Igor Mammedov <imammedo@redhat.com> Message-Id: <1484052795-158195-4-git-send-email-imammedo@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2016-10-17hostmem: Register TYPE_MEMORY_BACKEND properties as class propertiesEduardo Habkost
The NULL errp arguments on the property registration calls were changed to &error_abort. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2016-08-02fix qemu exit on memory hotplug when allocation fails at prealloc timeIgor Mammedov
When adding hostmem backend at runtime, QEMU might exit with error: "os_mem_prealloc: Insufficient free host memory pages available to allocate guest RAM" It happens due to os_mem_prealloc() not handling errors gracefully. Fix it by passing errp argument so that os_mem_prealloc() could report error to callers and undo performed allocation when os_mem_prealloc() fails. Signed-off-by: Igor Mammedov <imammedo@redhat.com> Message-Id: <1469008443-72059-1-git-send-email-imammedo@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-07-13hostmem: detect host backend memory is being used properlyXiao Guangrong
Currently, we use memory_region_is_mapped() to detect if the host backend memory is being used. This works if the memory is directly mapped into guest's address space, however, it is not true for nvdimm as it uses aliased memory region to map the memory. This is why this bug can happen: https://bugzilla.redhat.com/show_bug.cgi?id=1352769 Fix it by introduce a new filed, is_mapped, to HostMemoryBackend, we set/clear this filed accordingly when the device link/unlink to host backend memory Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-07-13hostmem: fix QEMU crash by 'info memdev'Xiao Guangrong
'info memdev' crashes QEMU: (qemu) info memdev Unexpected error in parse_str() at qapi/string-input-visitor.c:111: Parameter 'null' expects an int64 value or range It is caused by null uint16List is returned if 'host-nodes' is the default value Return MAX_NODES under this case to fix this bug Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-03-22include/qemu/osdep.h: Don't include qapi/error.hMarkus Armbruster
Commit 57cb38b included qapi/error.h into qemu/osdep.h to get the Error typedef. Since then, we've moved to include qemu/osdep.h everywhere. Its file comment explains: "To avoid getting into possible circular include dependencies, this file should not include any other QEMU headers, with the exceptions of config-host.h, compiler.h, os-posix.h and os-win32.h, all of which are doing a similar job to this file and are under similar constraints." qapi/error.h doesn't do a similar job, and it doesn't adhere to similar constraints: it includes qapi-types.h. That's in excess of 100KiB of crap most .c files don't actually need. Add the typedef to qemu/typedefs.h, and include that instead of qapi/error.h. Include qapi/error.h in .c files that need it and don't get it now. Include qapi-types.h in qom/object.h for uint16List. Update scripts/clean-includes accordingly. Update it further to match reality: replace config.h by config-target.h, add sysemu/os-posix.h, sysemu/os-win32.h. Update the list of includes in the qemu/osdep.h comment quoted above similarly. This reduces the number of objects depending on qapi/error.h from "all of them" to less than a third. Unfortunately, the number depending on qapi-types.h shrinks only a little. More work is needed for that one. Signed-off-by: Markus Armbruster <armbru@redhat.com> [Fix compilation without the spice devel packages. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-02-08qom: Swap 'name' next to visitor in ObjectPropertyAccessorEric Blake
Similar to the previous patch, it's nice to have all functions in the tree that involve a visitor and a name for conversion to or from QAPI to consistently stick the 'name' parameter next to the Visitor parameter. Done by manually changing include/qom/object.h and qom/object.c, then running this Coccinelle script and touching up the fallout (Coccinelle insisted on adding some trailing whitespace). @ rule1 @ identifier fn; typedef Object, Visitor, Error; identifier obj, v, opaque, name, errp; @@ void fn - (Object *obj, Visitor *v, void *opaque, const char *name, + (Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { ... } @@ identifier rule1.fn; expression obj, v, opaque, name, errp; @@ fn(obj, v, - opaque, name, + name, opaque, errp) Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <1454075341-13658-20-git-send-email-eblake@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2016-02-08qapi: Swap visit_* arguments for consistent 'name' placementEric Blake
JSON uses "name":value, but many of our visitor interfaces were called with visit_type_FOO(v, &value, name, errp). This can be a bit confusing to have to mentally swap the parameter order to match JSON order. It's particularly bad for visit_start_struct(), where the 'name' parameter is smack in the middle of the otherwise-related group of 'obj, kind, size' parameters! It's time to do a global swap of the parameter ordering, so that the 'name' parameter is always immediately after the Visitor argument. Additional reason in favor of the swap: the existing include/qjson.h prefers listing 'name' first in json_prop_*(), and I have plans to unify that file with the qapi visitors; listing 'name' first in qapi will minimize churn to the (admittedly few) qjson.h clients. Later patches will then fix docs, object.h, visitor-impl.h, and those clients to match. Done by first patching scripts/qapi*.py by hand to make generated files do what I want, then by running the following Coccinelle script to affect the rest of the code base: $ spatch --sp-file script `git grep -l '\bvisit_' -- '**/*.[ch]'` I then had to apply some touchups (Coccinelle insisted on TAB indentation in visitor.h, and botched the signature of visit_type_enum() by rewriting 'const char *const strings[]' to the syntactically invalid 'const char*const[] strings'). The movement of parameters is sufficient to provoke compiler errors if any callers were missed. // Part 1: Swap declaration order @@ type TV, TErr, TObj, T1, T2; identifier OBJ, ARG1, ARG2; @@ void visit_start_struct -(TV v, TObj OBJ, T1 ARG1, const char *name, T2 ARG2, TErr errp) +(TV v, const char *name, TObj OBJ, T1 ARG1, T2 ARG2, TErr errp) { ... } @@ type bool, TV, T1; identifier ARG1; @@ bool visit_optional -(TV v, T1 ARG1, const char *name) +(TV v, const char *name, T1 ARG1) { ... } @@ type TV, TErr, TObj, T1; identifier OBJ, ARG1; @@ void visit_get_next_type -(TV v, TObj OBJ, T1 ARG1, const char *name, TErr errp) +(TV v, const char *name, TObj OBJ, T1 ARG1, TErr errp) { ... } @@ type TV, TErr, TObj, T1, T2; identifier OBJ, ARG1, ARG2; @@ void visit_type_enum -(TV v, TObj OBJ, T1 ARG1, T2 ARG2, const char *name, TErr errp) +(TV v, const char *name, TObj OBJ, T1 ARG1, T2 ARG2, TErr errp) { ... } @@ type TV, TErr, TObj; identifier OBJ; identifier VISIT_TYPE =~ "^visit_type_"; @@ void VISIT_TYPE -(TV v, TObj OBJ, const char *name, TErr errp) +(TV v, const char *name, TObj OBJ, TErr errp) { ... } // Part 2: swap caller order @@ expression V, NAME, OBJ, ARG1, ARG2, ERR; identifier VISIT_TYPE =~ "^visit_type_"; @@ ( -visit_start_struct(V, OBJ, ARG1, NAME, ARG2, ERR) +visit_start_struct(V, NAME, OBJ, ARG1, ARG2, ERR) | -visit_optional(V, ARG1, NAME) +visit_optional(V, NAME, ARG1) | -visit_get_next_type(V, OBJ, ARG1, NAME, ERR) +visit_get_next_type(V, NAME, OBJ, ARG1, ERR) | -visit_type_enum(V, OBJ, ARG1, ARG2, NAME, ERR) +visit_type_enum(V, NAME, OBJ, ARG1, ARG2, ERR) | -VISIT_TYPE(V, OBJ, NAME, ERR) +VISIT_TYPE(V, NAME, OBJ, ERR) ) Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <1454075341-13658-19-git-send-email-eblake@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2016-02-04backends: Clean up includesPeter Maydell
Clean up includes so that osdep.h is included first and headers which it implies are not included manually. This commit was created with scripts/clean-includes. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1454089805-5470-5-git-send-email-peter.maydell@linaro.org
2015-11-23hostmem: Ignore ENOSYS while setting MPOL_DEFAULTPavel Fedin
Currently hostmem backend fails if CONFIG_NUMA is enabled in QEMU (the default) but NUMA is not supported by the kernel. This makes it impossible to use ivshmem in such configurations. This patch fixes the problem by ignoring ENOSYS error if policy is set to MPOL_DEFAULT. This way the code behaves in the same way as if CONFIG_NUMA was not defined. qemu will still fail if the user specifies some other policy, so that the user knows it. Signed-off-by: Pavel Fedin <p.fedin@samsung.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2015-07-22hostmem: Fix qemu_opt_get_bool() crash in host_memory_backend_init()Eduardo Habkost
This fixes the following crash, introduced by commit 49d2e648e8087d154d8bf8b91f27c8e05e79d5a6: $ gdb --args qemu-system-x86_64 -machine pc,mem-merge=off -object memory-backend-ram,id=ram-node0,size=1024 [...] Program received signal SIGABRT, Aborted. (gdb) bt #0 0x00007ffff253b8c7 in raise () at /lib64/libc.so.6 #1 0x00007ffff253d52a in abort () at /lib64/libc.so.6 #2 0x00007ffff253446d in __assert_fail_base () at /lib64/libc.so.6 #3 0x00007ffff2534522 in () at /lib64/libc.so.6 #4 0x00005555558bb80a in qemu_opt_get_bool_helper (opts=0x55555621b650, name=name@entry=0x5555558ec922 "mem-merge", defval=defval@entry=true, del=del@entry=false) at qemu/util/qemu-option.c:388 #5 0x00005555558bbb5a in qemu_opt_get_bool (opts=<optimized out>, name=name@entry=0x5555558ec922 "mem-merge", defval=defval@entry=true) at qemu/util/qemu-option.c:398 #6 0x0000555555720a24 in host_memory_backend_init (obj=0x5555562ac970) at qemu/backends/hostmem.c:226 Instead of using qemu_opt_get_bool(), that didn't work with qemu_machine_opts for a long time, we can use the corresponding MachineState fields. Reviewed-by: Marcel Apfelbaum <marcel@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2015-06-22Include qapi/qmp/qerror.h exactly where neededMarkus Armbruster
In particular, don't include it into headers. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
2015-06-19qom: Don't pass string table to object_get_enum() functionDaniel P. Berrange
Now that properties can be explicitly registered as an enum type, there is no need to pass the string table to the object_get_enum() function. The object property registration already has a pointer to the string table. In changing this method signature, the hostmem backend object has to be converted to use the new enum property registration code, which simplifies it somewhat. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Andreas Färber <afaerber@suse.de>
2015-06-19backends: Fix typename of 'policy' enum property in hostmem objDaniel P. Berrange
The 'policy' property was being registered with a typename of 'str', but it is in fact an enum of the 'HostMemPolicy' type. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Andreas Färber <afaerber@suse.de>
2015-04-01hostmem: Prevent removing an in-use memory backendLin Ma
showing a memory device whose memdev is removed leads an assert: (qemu) object_add memory-backend-ram,id=ram0,size=128M (qemu) device_add pc-dimm,id=d0,memdev=ram0 (qemu) object_del ram0 (qemu) info memory-devices ** ERROR:qom/object.c:1274:object_get_canonical_path_component:\ assertion failed: (obj->parent != NULL) Aborted The patch prevents removing an in-use mem backend and error out. Signed-off-by: Lin Ma <lma@suse.com> Message-Id: <1427704589-7688-3-git-send-email-lma@suse.com> Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-08-20hostmem: set MPOL_MF_MOVEMichael S. Tsirkin
When memory is allocated on a wrong node, MPOL_MF_STRICT doesn't move it - it just fails the allocation. A simple way to reproduce the failure is with mlock=on realtime feature. The code comment actually says: "ensure policy won't be ignored" so setting MPOL_MF_MOVE seems like a better way to do this. Cc: qemu-stable@nongnu.org Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-08-18memory: remove memory_region_destroyPaolo Bonzini
The function is empty after the previous patch, so remove it. Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-06-19hostmem: add properties for NUMA memory policyHu Tao
Signed-off-by: Hu Tao <hutao@cn.fujitsu.com> [Raise errors on setting properties if !CONFIG_NUMA. Add BUILD_BUG_ON checks. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-06-19hostmem: allow preallocation of any memory regionPaolo Bonzini
And allow preallocation of file-based memory even without -mem-prealloc. Some care is necessary because -mem-prealloc does not allow disabling preallocation for hostmem-file. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-06-19hostmem: add merge and dump propertiesPaolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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