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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>
2018-02-10oslib-posix: check for posix_memalign in configure scriptAndreas Gustafsson
Check for the presence of posix_memalign() in the configure script, not using "defined(_POSIX_C_SOURCE) && !defined(__sun__)". This lets qemu use posix_memalign() on NetBSD versions that have it, instead of falling back to valloc() which is wasteful when the required alignment is smaller than a page. Signed-off-by: Andreas Gustafsson <gson@gson.org> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru> Reviewed-by: Kamil Rytarowski <n54@gmx.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
2017-11-02oslib-posix: Use sysctl(2) call to resolve exec_dir on NetBSDKamil Rytarowski
NetBSD 8.0(beta) ships with KERN_PROC_PATHNAME in sysctl(2). Older NetBSD versions can use argv[0] parsing fallback. This code section is partly shared with FreeBSD. Signed-off-by: Kamil Rytarowski <n54@gmx.com> Message-id: 20171028194833.23858-1-n54@gmx.com Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2017-10-20oslib-posix: Fix compiler warning and some data typesStefan Weil
gcc warning: /qemu/util/oslib-posix.c:304:11: error: variable ‘addr’ might be clobbered by ‘longjmp’ or ‘vfork’ [-Werror=clobbered] Fix also some related data types: numpages, hpagesize are used as pointer offset. Always use size_t for them and also for the derived numpages_per_thread and size_per_thread. Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Stefan Weil <sw@weilnetz.de> Message-id: 20171016202912.1117-1-sw@weilnetz.de Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2017-08-30oslib-posix: Print errors before aborting on qemu_alloc_stack()Eduardo Habkost
If QEMU is running on a system that's out of memory and mmap() fails, QEMU aborts with no error message at all, making it hard to debug the reason for the failure. Add perror() calls that will print error information before aborting. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-id: 20170829212053.6003-1-ehabkost@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2017-07-21util/oslib-posix.c: Avoid warning on NetBSDPeter Maydell
On NetBSD the compiler warns: util/oslib-posix.c: In function 'sigaction_invoke': util/oslib-posix.c:589:5: warning: missing braces around initializer [-Wmissing-braces] siginfo_t si = { 0 }; ^ util/oslib-posix.c:589:5: warning: (near initialization for 'si.si_pad') [-Wmissing-braces] because on this platform siginfo_t is defined as typedef union siginfo { char si_pad[128]; /* Total size; for future expansion */ struct _ksiginfo _info; } siginfo_t; Avoid this warning by initializing the struct with {} instead; this is a GCC extension but we use it all over the codebase already. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Eric Blake <eblake@redhat.com> Message-id: 1500568341-8389-1-git-send-email-peter.maydell@linaro.org
2017-07-11block: rip out all traces of password promptingDaniel P. Berrange
Now that qcow & qcow2 are wired up to get encryption keys via the QCryptoSecret object, nothing is relying on the interactive prompting for passwords. All the code related to password prompting can thus be ripped out. Reviewed-by: Alberto Garcia <berto@igalia.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Message-id: 20170623162419.26068-17-berrange@redhat.com Signed-off-by: Max Reitz <mreitz@redhat.com>
2017-06-12Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into ↵Peter Maydell
staging # gpg: Signature made Wed 07 Jun 2017 19:06:51 BST # gpg: using RSA key 0x9CA4ABB381AB73C8 # gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" # gpg: aka "Stefan Hajnoczi <stefanha@gmail.com>" # Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35 775A 9CA4 ABB3 81AB 73C8 * remotes/stefanha/tags/block-pull-request: configure: split c and cxx extra flags coroutine-lock: do not touch coroutine after another one has been entered .gdbinit: load QEMU sub-commands when gdb starts coccinelle: fix typo in comment oslib: strip trailing '\n' from error_setg() string argument Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2017-06-07oslib: strip trailing '\n' from error_setg() string argumentPhilippe Mathieu-Daudé
spotted by Coccinelle script scripts/coccinelle/err-bad-newline.cocci Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Laurent Vivier <lvivier@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2017-06-06Check the return value of fcntl in qemu_set_cloexecStefano Stabellini
Assert that the return value is not an error. This issue was found by Coverity. CID: 1374831 Signed-off-by: Stefano Stabellini <sstabellini@kernel.org> CC: groug@kaod.org CC: pbonzini@redhat.com CC: Eric Blake <eblake@redhat.com> Message-Id: <1494356693-13190-2-git-send-email-sstabellini@kernel.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-05-25util: drop old utimensat() compat codeGreg Kurz
Now that 9pfs and virtfs-proxy-helper have been converted to utimensat(), we don't need to keep qemu_utimens() anymore. Signed-off-by: Greg Kurz <groug@kaod.org> Reviewed-by: Eric Blake <eblake@redhat.com>
2017-03-24mem-prealloc: fix sysconf(_SC_NPROCESSORS_ONLN) failure case.Jitendra Kolhe
This was spotted by Coverity, in case where sysconf(_SC_NPROCESSORS_ONLN) fails and returns -1. This results in memset_num_threads getting set to -1. Which we then pass to g_new0(). The patch replaces MAX_MEM_PREALLOC_THREAD_COUNT macro with a function call get_memset_num_threads() to handle sysconf() failure gracefully. In case sysconf() fails, we fall back to single threaded. (Spotted by Coverity, CID 1372465.) Signed-off-by: Jitendra Kolhe <jitendra.kolhe@hpe.com> Message-Id: <1490079006-32495-1-git-send-email-jitendra.kolhe@hpe.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-03-17oslib-posix: fix compilation on OpenBSDPaolo Bonzini
si_band is not found in OpenBSD. It is marked as obsolescent in POSIX, so we can delete it without any remorse. Reported-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 20170317152214.6148-1-pbonzini@redhat.com Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Tested-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2017-03-15os: don't corrupt pre-existing memory-backend data with preallocDaniel P. Berrange
When using a memory-backend object with prealloc turned on, QEMU will memset() the first byte in every memory page to zero. While this might have been acceptable for memory backends associated with RAM, this corrupts application data for NVDIMMs. Instead of setting every page to zero, read the current byte value and then just write that same value back, so we are not corrupting the original data. Directly write the value instead of memset()ing it, since there's no benefit to memset for a single byte write. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Andrea Arcangeli <aarcange@redhat.com> Message-id: 20170303113255.28262-1-berrange@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@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>
2017-03-03cpus: remove ugly cast on sigbus_handlerPaolo Bonzini
The cast is there because sigbus_handler is invoked via sigfd_handler. But it feels just wrong to use struct qemu_signalfd_siginfo in the prototype of a function that is passed to sigaction. Instead, do a simple-minded conversion of qemu_signalfd_siginfo to siginfo_t. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-11-22Fix FreeBSD (10.x) build after 7dc9ae43Ed Maste
Include sys/user.h for declaration of 'struct kinfo_proc'. Add -lutil to qemu-ga link for kinfo_getproc. Signed-off-by: Ed Maste <emaste@freebsd.org> Message-id: 1479778365-11315-1-git-send-email-emaste@freebsd.org Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2016-10-28clean-up: removed duplicate #includesAnand J
Some files contain multiple #includes of the same header file. Removed most of those unnecessary duplicate entries using scripts/clean-includes. Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Anand J <anand.indukala@gmail.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2016-10-10Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into stagingPeter Maydell
* Thread Sanitizer fixes (Alex) * Coverity fixes (David) * test-qht fixes (Emilio) * QOM interface for info irq/info pic (Hervé) * -rtc clock=rt fix (Junlian) * mux chardev fixes (Marc-André) * nicer report on death by signal (Michal) * qemu-tech TLC (Paolo) * MSI support for edu device (Peter) * qemu-nbd --offset fix (Tomáš) # gpg: Signature made Fri 07 Oct 2016 17:25:10 BST # gpg: using RSA key 0xBFFBD25F78C7AE83 # gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" # gpg: aka "Paolo Bonzini <pbonzini@redhat.com>" # Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4 E2F7 7E15 100C CD36 69B1 # Subkey fingerprint: F133 3857 4B66 2389 866C 7682 BFFB D25F 78C7 AE83 * remotes/bonzini/tags/for-upstream: (39 commits) qemu-doc: merge qemu-tech and qemu-doc qemu-tech: rewrite some parts qemu-tech: reorganize content qemu-tech: move TCG test documentation to tests/tcg/README qemu-tech: move user mode emulation features from qemu-tech qemu-tech: document lazy condition code evaluation in cpu.h qemu-tech: move text from qemu-tech to tcg/README qemu-doc: drop installation and compilation notes qemu-doc: replace introduction with the one from the internals manual qemu-tech: drop index test-qht: perform lookups under rcu_read_lock qht: fix unlock-after-free segfault upon resizing qht: simplify qht_reset_size qemu-nbd: Shrink image size by specified offset qemu_kill_report: Report PID name too util: Introduce qemu_get_pid_name char: update read handler in all cases char: use a fixed idx for child muxed chr i8259: give ISA device when registering ISA ioports .travis.yml: add gcc sanitizer build ... Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2016-10-04util: Introduce qemu_get_pid_nameMichal Privoznik
This is a small helper that tries to fetch binary name for given PID. Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Message-Id: <4d75d475c1884f8e94ee8b1e57273ddf3ed68bf7.1474987617.git.mprivozn@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-09-29oslib-posix: add a configure switch to debug stack usagePeter Lieven
this adds a knob to track the maximum stack usage of stacks created by qemu_alloc_stack. Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2016-09-29oslib-posix: add helpers for stack alloc and freePeter Lieven
the allocated stack will be adjusted to the minimum supported stack size by the OS and rounded up to be a multiple of the system pagesize. Additionally an architecture dependent guard page is added to the stack to catch stack overflows. Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Kevin Wolf <kwolf@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>
2016-07-17use g_path_get_dirname instead of dirnameWei Jiangang
Use g_path_get_basename to get the directory components of a file name, and free its return when no longer needed. Signed-off-by: Wei Jiangang <weijg.fnst@cn.fujitsu.com> Message-Id: <1459997185-15669-3-git-send-email-weijg.fnst@cn.fujitsu.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-07-12Use #include "..." for our own headers, <...> for othersMarkus Armbruster
Tracked down with an ugly, brittle and probably buggy Perl script. Also move includes converted to <...> up so they get included before ours where that's obviously okay. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Tested-by: Eric Blake <eblake@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2016-06-16os-posix: include sys/mman.hPaolo Bonzini
qemu/osdep.h checks whether MAP_ANONYMOUS is defined, but this check is bogus without a previous inclusion of sys/mman.h. Include it in sysemu/os-posix.h and remove it from everywhere else. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-05-23exec.c: Ensure right alignment also for file backed ramDominik Dingel
While in the anonymous ram case we already take care of the right alignment such an alignment gurantee does not exist for file backed ram allocation. Instead, pagesize is used for alignment. On s390 this is not enough for gmap, as we need to satisfy an alignment up to segments. Reported-by: Halil Pasic <pasic@linux.vnet.ibm.com> Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com> Message-Id: <1461585338-45863-1-git-send-email-dingel@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-04-22util: align memory allocations to 2M on AArch64Christoffer Dall
For KVM to use Transparent Huge Pages (THP) we have to ensure that the alignment of the userspace address of the KVM memory slot and the IPA that the guest sees for a memory region have the same offset from the 2M huge page size boundary. One way to achieve this is to always align the IPA region at a 2M boundary and ensure that the mmap alignment is also at 2M. Unfortunately, we were only doing this for __arm__, not for __aarch64__, so add this simple condition. This fixes a performance regression using KVM/ARM on AArch64 platforms that showed a performance penalty of more than 50%, introduced by the following commit: 9fac18f (oslib: allocate PROT_NONE pages on top of RAM, 2015-09-10) We were only lucky before the above commit, because we were allocating large regions and naturally getting a 2M alignment on those allocations then. Cc: qemu-stable@nongnu.org Reported-by: Shih-Wei Li <shihwei@cs.columbia.edu> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> [PMM: wrapped long line] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2016-03-24Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into stagingPeter Maydell
* Log filtering from Alex and Peter * Chardev fix from Marc-André * config.status tweak from David * Header file tweaks from Markus, myself and Veronia (Outreachy candidate) * get_ticks_per_sec() removal from Rutuja (Outreachy candidate) * Coverity fix from myself * PKE implementation from myself, based on rth's XSAVE support # gpg: Signature made Thu 24 Mar 2016 20:15:11 GMT using RSA key ID 78C7AE83 # gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" # gpg: aka "Paolo Bonzini <pbonzini@redhat.com>" * remotes/bonzini/tags/for-upstream: (28 commits) target-i386: implement PKE for TCG config.status: Pass extra parameters char: translate from QIOChannel error to errno exec: fix error handling in file_ram_alloc cputlb: modernise the debug support qemu-log: support simple pid substitution for logs target-arm: dfilter support for in_asm qemu-log: dfilter-ise exec, out_asm, op and opt_op qemu-log: new option -dfilter to limit output qemu-log: Improve the "exec" TB execution logging qemu-log: Avoid function call for disabled qemu_log_mask logging qemu-log: correct help text for -d cpu tcg: pass down TranslationBlock to tcg_code_gen util: move declarations out of qemu-common.h Replaced get_tick_per_sec() by NANOSECONDS_PER_SECOND hw: explicitly include qemu-common.h and cpu.h include/crypto: Include qapi-types.h or qemu/bswap.h instead of qemu-common.h isa: Move DMA_transfer_handler from qemu-common.h to hw/isa/isa.h Move ParallelIOArg from qemu-common.h to sysemu/char.h Move QEMU_ALIGN_*() from qemu-common.h to qemu/osdep.h ... Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Conflicts: scripts/clean-includes
2016-03-22util: move declarations out of qemu-common.hVeronia Bahaa
Move declarations out of qemu-common.h for functions declared in utils/ files: e.g. include/qemu/path.h for utils/path.c. Move inline functions out of qemu-common.h and into new files (e.g. include/qemu/bcd.h) Signed-off-by: Veronia Bahaa <veroniabahaa@gmail.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>
2016-03-22Remove unneeded include statements for setjmp.hStefan Weil
As soon as setjmp.h is included from qemu/osdep.h, those old include statements are no longer needed. Add also setjmp.h to the list in scripts/clean-includes. Signed-off-by: Stefan Weil <sw@weilnetz.de>
2016-02-16oslib-posix.c: Move workaround for OSX daemon() deprecation to osdep.hPeter Maydell
The right place for "work around issues with system headers" code is osdep.h. Move the workaround for OSX's stdlib.h emitting a deprecation warning for daemon() to that header. This also fixes a problem where running clean-includes on oslib-posix.c would erroneously remove the #include <stdlib.h> from it, breaking the workaround. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Eric Blake <eblake@redhat.com>
2016-02-04util: 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: 1454089805-5470-6-git-send-email-peter.maydell@linaro.org
2015-12-02util/mmap-alloc: fix hugetlb support on ppc64Michael S. Tsirkin
Since commit 8561c9244ddf1122d "exec: allocate PROT_NONE pages on top of RAM", it is no longer possible to back guest RAM with hugepages on ppc64 hosts: mmap(NULL, 285212672, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x3fff57000000 mmap(0x3fff57000000, 268435456, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 19, 0) = -1 EBUSY (Device or resource busy) This is because on ppc64, Linux fixes a page size for a virtual address at mmap time, so we can't switch a range of memory from anonymous small pages to hugetlbs with MAP_FIXED. See commit d0f13e3c20b6fb73ccb467bdca97fa7cf5a574cd ("[POWERPC] Introduce address space "slices"") in Linux history for the details. Detect this and create the PROT_NONE mapping using the same fd. Naturally, this makes the guard page bigger with hugetlbfs. Based on patch by Greg Kurz. Acked-by: Rik van Riel <riel@redhat.com> Reviewed-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Tested-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2015-10-22Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into stagingPeter Maydell
vhost, pc, virtio features, fixes, cleanups New features: VT-d support for devices behind a bridge vhost-user migration support Signed-off-by: Michael S. Tsirkin <mst@redhat.com> # gpg: Signature made Thu 22 Oct 2015 12:39:19 BST using RSA key ID D28D5469 # gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>" # gpg: aka "Michael S. Tsirkin <mst@redhat.com>" * remotes/mst/tags/for_upstream: (37 commits) hw/isa/lpc_ich9: inject the SMI on the VCPU that is writing to APM_CNT i386: keep cpu_model field in MachineState uptodate vhost: set the correct queue index in case of migration with multiqueue piix: fix resource leak reported by Coverity seccomp: add memfd_create to whitelist vhost-user-test: check ownership during migration vhost-user-test: add live-migration test vhost-user-test: learn to tweak various qemu arguments vhost-user-test: wrap server in TestServer struct vhost-user-test: remove useless static check vhost-user-test: move wait_for_fds() out vhost: add migration block if memfd failed vhost-user: use an enum helper for features mask vhost user: add rarp sending after live migration for legacy guest vhost user: add support of live migration net: add trace_vhost_user_event vhost-user: document migration log vhost: use a function for each call vhost-user: add a migration blocker vhost-user: send log shm fd along with log_base ... Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2015-10-21exec: factor out duplicate mmap codeMichael S. Tsirkin
Anonymous and file-backed RAM allocation are now almost exactly the same. Reduce code duplication by moving RAM mmap code out of oslib-posix.c and exec.c. Reported-by: Marc-André Lureau <mlureau@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Tested-by: Thibaut Collet <thibaut.collet@6wind.com>
2015-10-20osdep: add qemu_fork() wrapper for safely handling signalsDaniel P. Berrange
When using regular fork() the child process of course inherits all the parents' signal handlers. If the child then proceeds to close() any open file descriptors, it may break some of those registered signal handlers. The child generally does not want to ever run any of the signal handlers that the parent may have installed in the short time before it exec's. The parent may also have blocked various signals which the child process will want enabled. This introduces a wrapper qemu_fork() that takes care to sanitize signal handling across fork. Before forking it blocks all signals in the parent thread. After fork returns, the parent unblocks the signals and carries on as usual. The child, however, resets all the signal handlers back to their defaults before it unblocks signals. The child process can now exec the binary in a "clean" signal environment. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2015-10-01oslib: allocate PROT_NONE pages on top of RAMMichael S. Tsirkin
This inserts a read and write protected page between RAM and QEMU memory. This makes it harder to exploit QEMU bugs resulting from buffer overflows in devices using variants of cpu_physical_memory_map, dma_memory_map etc. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com>
2015-10-01oslib: rework anonimous RAM allocationMichael S. Tsirkin
At the moment we first allocate RAM, sometimes more than necessary for alignment reasons. We then free the extra RAM. Rework this to avoid the temporary allocation: reserve the range by mapping it with PROT_NONE, then use just the necessary range with MAP_FIXED. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com>
2015-05-22util: allow \n to terminate password inputDaniel P. Berrange
The qemu_read_password() method looks for \r to terminate the reading of the a password. This is what will be seen when reading the password from a TTY. When scripting though, it is useful to be able to send the password via a pipe, in which case we must look for \n to terminate password input. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2015-05-22util: move read_password method out of qemu-img into osdep/oslibDaniel P. Berrange
The qemu-img.c file has a read_password() method impl that is used to prompt for passwords on the console, with impls for POSIX and Windows. This will be needed by qemu-io.c too, so move it into the QEMU osdep/oslib files where it can be shared without code duplication Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2015-03-10oslib-posix: Fix compiler warning (-Wclobbered) and simplify the codeStefan Weil
gcc reports this warning with -Wclobbered: util/oslib-posix.c: In function ‘os_mem_prealloc’: util/oslib-posix.c:374:49: error: argument ‘memory’ might be clobbered by ‘longjmp’ or ‘vfork’ [-Werror=clobbered] Fix this and simplify the code by using an existing macro. Signed-off-by: Stefan Weil <sw@weilnetz.de> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2014-11-23memory: expose alignment used for allocating RAM as MemoryRegion APIIgor Mammedov
introduce memory_region_get_alignment() that returns underlying memory block alignment or 0 if it's not relevant/implemented for backend. Signed-off-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-11-02util: Improve os_mem_prealloc error messageMichal Privoznik
Currently, when the preallocating guest memory process fails, a not so helpful error message is printed out: # virsh start migt10 error: Failed to start domain migt10 error: internal error: process exited while connecting to monitor: os_mem_prealloc: failed to preallocate pages From the error message it's not clear at the first glance where the problem lies. However, changing the error message might give users a clue. Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2014-08-15block: Introduce qemu_try_blockalign()Kevin Wolf
This function returns NULL instead of aborting when an allocation fails. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net>
2014-07-10oslib-posix: Fix new compiler error with -WclobberedStefan Weil
Newer versions of gcc report a warning (or an error with -Werror) when compiler option -Wclobbered (or -Wextra) is active: util/oslib-posix.c:372:12: error: variable ‘hpagesize’ might be clobbered by ‘longjmp’ or ‘vfork’ [-Werror=clobbered] The rewritten code fixes this warning: variable 'hpagesize' is now set and used in a block without any call of sigsetjmp or similar functions. Signed-off-by: Stefan Weil <sw@weilnetz.de> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-06-19memory: move preallocation code out of exec.cPaolo Bonzini
So that backends can use it. Since we need the page size for efficiency, move code to compute it out of translate-all.c and into util/oslib-win32.c. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-03-13oslib-posix: Fix build on FreeBSDAndreas Färber
Commit 10f5bff622cad71645e22c027b77ac31e51008ef (util: Split out exec_dir from os_find_datadir) moved code from os-posix.c to util/oslib-posix.c but forgot to move a FreeBSD #include alongside, needed for CTL_KERN among others. Cc: Fam Zheng <famz@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Andreas Färber <andreas.faerber@web.de> Message-id: 1394717279-23406-1-git-send-email-andreas.faerber@web.de Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2014-02-20util: Split out exec_dir from os_find_datadirFam Zheng
With this change, main() calls qemu_init_exec_dir and uses argv[0] to init exec_dir. The saved value can be retrieved with qemu_get_exec_dir later. It will be reused by module loading. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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