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* util/qemu-thread-posix.c: Replace OS ifdefs with CONFIG_HAVE_SEM_TIMEDWAITPeter Maydell2017-09-263-6/+21
| | | | | | | | | | | | | | | | | | | | | | In qemu-thread-posix.c we have two implementations of the various qemu_sem_* functions, one of which uses native POSIX sem_* and the other of which emulates them with pthread conditions. This is necessary because not all our host OSes support sem_timedwait(). Instead of a hard-coded list of OSes which don't implement sem_timedwait(), which gets out of date, make configure test for the presence of the function and set a new CONFIG_HAVE_SEM_TIMEDWAIT appropriately. In particular, newer NetBSDs have sem_timedwait(), so this commit will switch them over to using it. OSX still does not have an implementation. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Kamil Rytarowski <n54@gmx.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* MAINTAINERS: update docs/interop/ entriesPhilippe Mathieu-Daudé2017-09-261-2/+2
| | | | | | | | | moved in commit 7746cf8aab68 Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Acked-by: Fam Zheng <famz@redhat.com> Acked-by: John Snow <jsnow@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* MAINTAINERS: update docs/devel/ entriesPhilippe Mathieu-Daudé2017-09-261-5/+5
| | | | | | | | moved in commit ac06724a7158 Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* MAINTAINERS: add missing Cryptography entryPhilippe Mathieu-Daudé2017-09-261-0/+1
| | | | | | Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Acked-by: Daniel P. Berrange <berrange@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* MAINTAINERS: add missing entry for Generic LoaderPhilippe Mathieu-Daudé2017-09-261-0/+1
| | | | | | Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Alistair Francis <alistair.francis@xilinx.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* MAINTAINERS: add missing AIO entryPhilippe Mathieu-Daudé2017-09-261-0/+1
| | | | | | | Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Acked-by: Fam Zheng <famz@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* MAINTAINERS: add missing entries for throttling infraPhilippe Mathieu-Daudé2017-09-261-1/+3
| | | | | | | Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Alberto Garcia <berto@igalia.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* MAINTAINERS: add missing SSI entriesPhilippe Mathieu-Daudé2017-09-261-0/+3
| | | | | | | | Alistair Francis volunteered :) Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Alistair Francis <alistair.francis@xilinx.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* MAINTAINERS: add missing PCI entriesPhilippe Mathieu-Daudé2017-09-261-0/+2
| | | | | | | Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Marcel Apfelbaum <marcel@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* MAINTAINERS: add missing qcow2 entryPhilippe Mathieu-Daudé2017-09-261-0/+1
| | | | | | | Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Acked-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* MAINTAINERS: add missing Guest Agent entriesPhilippe Mathieu-Daudé2017-09-261-0/+4
| | | | | | Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Acked-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* MAINTAINERS: add missing VMWare entryPhilippe Mathieu-Daudé2017-09-261-0/+1
| | | | | | | Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Thomas Huth <thuth@redhat.com> Reviewed-by: Dmitry Fleytman <dmitry@daynix.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* MAINTAINERS: add missing entry for vhostPhilippe Mathieu-Daudé2017-09-261-0/+1
| | | | | | Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* MAINTAINERS: add missing STM32 entryPhilippe Mathieu-Daudé2017-09-261-0/+1
| | | | | | | Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Thomas Huth <thuth@redhat.com> Reviewed-by: Alistair Francis <alistair@alistair23.me> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* MAINTAINERS: add missing ARM entriesPhilippe Mathieu-Daudé2017-09-261-2/+6
| | | | | | Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* Replace round_page() with TARGET_PAGE_ALIGN()Kamil Rytarowski2017-09-262-16/+6Star
| | | | | | | | This change fixes conflict with the DragonFly BSD headers. Signed-off-by: Kamil Rytarowski <n54@gmx.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* configure: Remove unused code (found by shellcheck)Stefan Weil2017-09-261-1/+0Star
| | | | | | | | | smartcard_cflags is no longer needed since commit 0b22ef0f57a8910d849602bef0940edcd0553d2c. Signed-off-by: Stefan Weil <sw@weilnetz.de> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
* Merge remote-tracking branch 'remotes/thibault/tags/samuel-thibault' into ↵Peter Maydell2017-09-253-44/+39Star
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | staging slirp updates # gpg: Signature made Sun 24 Sep 2017 19:07:51 BST # gpg: using RSA key 0x9E511E01C737F075 # gpg: Good signature from "Samuel Thibault <samuel.thibault@aquilenet.fr>" # gpg: aka "Samuel Thibault <sthibault@debian.org>" # gpg: aka "Samuel Thibault <samuel.thibault@gnu.org>" # gpg: aka "Samuel Thibault <samuel.thibault@inria.fr>" # gpg: aka "Samuel Thibault <samuel.thibault@labri.fr>" # gpg: aka "Samuel Thibault <samuel.thibault@ens-lyon.org>" # gpg: aka "Samuel Thibault <samuel.thibault@u-bordeaux.fr>" # gpg: WARNING: This key is not certified with sufficiently trusted signatures! # gpg: It is not certain that the signature belongs to the owner. # Primary key fingerprint: 900C B024 B679 31D4 0F82 304B D017 8C76 7D06 9EE6 # Subkey fingerprint: 9A37 3D36 64A8 DC62 DA0A 34FD 9E51 1E01 C737 F075 * remotes/thibault/tags/samuel-thibault: slirp: Add a special case for the NULL socket slirp: Fix intermittent send queue hangs on a socket slirp: Add explanation for hostfwd parsing failure Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
| * slirp: Add a special case for the NULL socketKevin Cernekee2017-09-241-8/+10
| | | | | | | | | | | | | | | | | | | | NULL sockets are used for NDP, BOOTP, and other critical operations. If the topmost mbuf in a NULL session is blocked pending resolution, it may cause problems if it blocks other packets with a NULL socket. So do not add mbufs with a NULL socket field to the same session. Signed-off-by: Kevin Cernekee <cernekee@chromium.org> Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
| * slirp: Fix intermittent send queue hangs on a socketKevin Cernekee2017-09-242-35/+17Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | if_output() originally sent one mbuf per call and used the slirp->next_m variable to keep track of where it left off. But nowadays it tries to send all of the mbufs from the fastq, and one mbuf from each session on the batchq. The next_m variable is both redundant and harmful: there is a case[0] involving delayed packets in which next_m ends up pointing to &slirp->if_batchq when an active session still exists, and this blocks all traffic for that session until qemu is restarted. The test case was created to reproduce a problem that was seen on long-running Chromium OS VM tests[1] which rapidly create and destroy ssh connections through hostfwd. [0] https://pastebin.com/NNy6LreF [1] https://bugs.chromium.org/p/chromium/issues/detail?id=766323 Signed-off-by: Kevin Cernekee <cernekee@chromium.org> Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
| * slirp: Add explanation for hostfwd parsing failureDr. David Alan Gilbert2017-09-241-1/+12
|/ | | | | | | | | | e.g. ./x86_64-softmmu/qemu-system-x86_64 -nographic -netdev 'user,id=vnet,hostfwd=:555.0.0.0:0-:22' qemu-system-x86_64: -netdev user,id=vnet,hostfwd=:555.0.0.0:0-:22: Invalid host forwarding rule ':555.0.0.0:0-:22' (Bad host address) Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
* Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into stagingPeter Maydell2017-09-2344-310/+2550
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * Speed up AddressSpaceDispatch creation (Alexey) * Fix kvm.c assert (David) * Memory fixes and further speedup (me) * Persistent reservation manager infrastructure (me) * virtio-serial: add enable_backend callback (Pavel) * chardev GMainContext fixes (Peter) # gpg: Signature made Fri 22 Sep 2017 20:07:33 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: (32 commits) chardev: remove context in chr_update_read_handler chardev: use per-dev context for io_add_watch_poll chardev: add Chardev.gcontext field chardev: new qemu_chr_be_update_read_handlers() scsi: add persistent reservation manager using qemu-pr-helper scsi: add multipath support to qemu-pr-helper scsi: build qemu-pr-helper scsi, file-posix: add support for persistent reservation management memory: Share special empty FlatView memory: seek FlatView sharing candidates among children subregions memory: trace FlatView creation and destruction memory: Create FlatView directly memory: Get rid of address_space_init_shareable memory: Rework "info mtree" to print flat views and dispatch trees memory: Do not allocate FlatView in address_space_init memory: Share FlatView's and dispatch trees between address spaces memory: Move address_space_update_ioeventfds memory: Alloc dispatch tree where topology is generared memory: Store physical root MR in FlatView memory: Rename mem_begin/mem_commit/mem_add helpers ... # Conflicts: # configure
| * chardev: remove context in chr_update_read_handlerPeter Xu2017-09-226-10/+6Star
| | | | | | | | | | | | | | | | | | | | | | | | We had a per-chardev cache for context, then we don't need this parameter to be passed in every time when chr_update_read_handler() called. As long as we are calling chr_update_read_handler() using qemu_chr_be_update_read_handlers() we'll be fine. Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <1505975754-21555-5-git-send-email-peterx@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * chardev: use per-dev context for io_add_watch_pollPeter Xu2017-09-224-5/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It was only passed in by chr_update_read_handlers(). However when reconnect, we'll lose that context information. So if a chardev was running on another context (rather than the default context, the NULL pointer), it'll switch back to the default context if reconnection happens. But, it should really stick to the old context. Convert all the callers of io_add_watch_poll() to use the internally cached gcontext. Then the context should be able to survive even after reconnections. Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <1505975754-21555-4-git-send-email-peterx@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * chardev: add Chardev.gcontext fieldPeter Xu2017-09-222-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | It caches the gcontext that is used to poll the chardev IO. Before this patch, we only passed it in via chr_update_read_handlers(). However that may not be enough if the char backend is disconnected and reconnected afterward. There are chardev codes that still assumed the context be NULL (which is the main context). Will fix that up in following up patches. Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <1505975754-21555-3-git-send-email-peterx@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * chardev: new qemu_chr_be_update_read_handlers()Peter Xu2017-09-223-5/+22
| | | | | | | | | | | | | | | | | | Add a wrapper for the chr_update_read_handler(). Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <1505975754-21555-2-git-send-email-peterx@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * scsi: add persistent reservation manager using qemu-pr-helperPaolo Bonzini2017-09-222-1/+303
| | | | | | | | | | | | This adds a concrete subclass of pr-manager that talks to qemu-pr-helper. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * scsi: add multipath support to qemu-pr-helperPaolo Bonzini2017-09-226-3/+433
| | | | | | | | | | | | | | | | | | | | | | Proper support of persistent reservation for multipath devices requires communication with the multipath daemon, so that the reservation is registered and applied when a path comes up. The device mapper utilities provide a library to do so; this patch makes qemu-pr-helper.c detect multipath devices and, when one is found, delegate the operation to libmpathpersist. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * scsi: build qemu-pr-helperPaolo Bonzini2017-09-226-5/+905
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Introduce a privileged helper to run persistent reservation commands. This lets virtual machines send persistent reservations without using CAP_SYS_RAWIO or out-of-tree patches. The helper uses Unix permissions and SCM_RIGHTS to restrict access to processes that can access its socket and prove that they have an open file descriptor for a raw SCSI device. The next patch will also correct the usage of persistent reservations with multipath devices. It would also be possible to support for Linux's IOC_PR_* ioctls in the future, to support NVMe devices. For now, however, only SCSI is supported. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * scsi, file-posix: add support for persistent reservation managementPaolo Bonzini2017-09-229-1/+258
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It is a common requirement for virtual machine to send persistent reservations, but this currently requires either running QEMU with CAP_SYS_RAWIO, or using out-of-tree patches that let an unprivileged QEMU bypass Linux's filter on SG_IO commands. As an alternative mechanism, the next patches will introduce a privileged helper to run persistent reservation commands without expanding QEMU's attack surface unnecessarily. The helper is invoked through a "pr-manager" QOM object, to which file-posix.c passes SG_IO requests for PERSISTENT RESERVE OUT and PERSISTENT RESERVE IN commands. For example: $ qemu-system-x86_64 -device virtio-scsi \ -object pr-manager-helper,id=helper0,path=/var/run/qemu-pr-helper.sock -drive if=none,id=hd,driver=raw,file.filename=/dev/sdb,file.pr-manager=helper0 -device scsi-block,drive=hd or: $ qemu-system-x86_64 -device virtio-scsi \ -object pr-manager-helper,id=helper0,path=/var/run/qemu-pr-helper.sock -blockdev node-name=hd,driver=raw,file.driver=host_device,file.filename=/dev/sdb,file.pr-manager=helper0 -device scsi-block,drive=hd Multiple pr-manager implementations are conceivable and possible, though only one is implemented right now. For example, a pr-manager could: - talk directly to the multipath daemon from a privileged QEMU (i.e. QEMU links to libmpathpersist); this makes reservation work properly with multipath, but still requires CAP_SYS_RAWIO - use the Linux IOC_PR_* ioctls (they require CAP_SYS_ADMIN though) - more interestingly, implement reservations directly in QEMU through file system locks or a shared database (e.g. sqlite) Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: Share special empty FlatViewAlexey Kardashevskiy2017-09-221-2/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This shares an cached empty FlatView among address spaces. The empty FV is used every time when a root MR renders into a FV without memory sections which happens when MR or its children are not enabled or zero-sized. The empty_view is not NULL to keep the rest of memory API intact; it also has a dispatch tree for the same reason. On POWER8 with 255 CPUs, 255 virtio-net, 40 PCI bridges guest this halves the amount of FlatView's in use (557 -> 260) and dispatch tables (~800000 -> ~370000). In an unrelated experiment with 112 non-virtio devices on x86 ("-M pc"), only 4 FlatViews are alive, and about ~2000 are created at startup. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20170921085110.25598-16-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: seek FlatView sharing candidates among children subregionsPaolo Bonzini2017-09-221-6/+34
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | A container can be used instead of an alias to allow switching between multiple subregions. In this case we cannot directly share the subregions (since they only belong to a single parent), but if the subregions are aliases we can in turn walk those. This is not enough to remove all source of quadratic FlatView creation, but it enables sharing of the PCI bus master FlatViews (and their AddressSpaceDispatch structures) across all PCI devices. For 112 virtio-net-pci devices, boot time is reduced from 25 to 10 seconds and memory consumption from 1.4 to 1 G. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: trace FlatView creation and destructionPaolo Bonzini2017-09-224-1/+7
| | | | | | | | Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: Create FlatView directlyAlexey Kardashevskiy2017-09-221-3/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This avoids usual memory_region_transaction_commit() which rebuilds all FVs. On POWER8 with 255 CPUs, 255 virtio-net, 40 PCI bridges guest this brings down the boot time from 25s to 20s and reduces the amount of temporary FVs allocated during machine constructon (~800000 -> ~640000) and amount of temporary dispatch trees (~370000 -> ~300000), the total memory footprint goes down (18G -> 17G). Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20170921085110.25598-18-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: Get rid of address_space_init_shareableAlexey Kardashevskiy2017-09-227-58/+19Star
| | | | | | | | | | | | | | | | | | | | | | Since FlatViews are shared now and ASes not, this gets rid of address_space_init_shareable(). This should cause no behavioural change. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20170921085110.25598-17-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: Rework "info mtree" to print flat views and dispatch treesAlexey Kardashevskiy2017-09-216-15/+176
| | | | | | | | | | | | | | | | | | | | | | | | This adds a new "-d" switch to "info mtree" to print dispatch tree internals. This changes the way "-f" is handled - it prints now flat views and associated address spaces. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20170921085110.25598-15-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: Do not allocate FlatView in address_space_initAlexey Kardashevskiy2017-09-211-6/+23
| | | | | | | | | | | | | | | | | | This creates a new AS object without any FlatView as memory_region_transaction_commit() may want to reuse the empty FV. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20170921085110.25598-14-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: Share FlatView's and dispatch trees between address spacesAlexey Kardashevskiy2017-09-211-11/+45
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This allows sharing flat views between address spaces (AS) when the same root memory region is used when creating a new address space. This is done by walking through all ASes and caching one FlatView per a physical root MR (i.e. not aliased). This removes search for duplicates from address_space_init_shareable() as FlatViews are shared elsewhere and keeping as::ref_count correct seems an unnecessary and useless complication. This should cause no change and memory use or boot time yet. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20170921085110.25598-13-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: Move address_space_update_ioeventfdsAlexey Kardashevskiy2017-09-211-2/+1Star
| | | | | | | | | | | | | | | | | | So it is called (twice) from the same function. This is to make the next patches a bit simpler. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20170921085110.25598-12-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: Alloc dispatch tree where topology is generaredAlexey Kardashevskiy2017-09-211-9/+9
| | | | | | | | | | | | | | | | This is to make next patches simpler. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20170921085110.25598-11-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: Store physical root MR in FlatViewAlexey Kardashevskiy2017-09-211-4/+22
| | | | | | | | | | | | | | | | | | | | Address spaces get to keep a root MR (alias or not) but FlatView stores the actual MR as this is going to be used later on to decide whether to share a particular FlatView or not. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20170921085110.25598-10-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: Rename mem_begin/mem_commit/mem_add helpersAlexey Kardashevskiy2017-09-213-15/+9Star
| | | | | | | | | | | | | | | | | | | | This renames some helpers to reflect better what they do. This should cause no behavioural change. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20170921085110.25598-9-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: Cleanup after switching to FlatViewAlexey Kardashevskiy2017-09-211-8/+8
| | | | | | | | | | | | | | | | | | | | | | We store AddressSpaceDispatch* in FlatView anyway so there is no need to carry it from mem_add() to register_subpage/register_multipage. This should cause no behavioural change. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20170921085110.25598-8-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: Switch memory from using AddressSpace to FlatViewAlexey Kardashevskiy2017-09-215-109/+159
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | FlatView's will be shared between AddressSpace's and subpage_t and MemoryRegionSection cannot store AS anymore, hence this change. In particular, for: typedef struct subpage_t { MemoryRegion iomem; - AddressSpace *as; + FlatView *fv; hwaddr base; uint16_t sub_section[]; } subpage_t; struct MemoryRegionSection { MemoryRegion *mr; - AddressSpace *address_space; + FlatView *fv; hwaddr offset_within_region; Int128 size; hwaddr offset_within_address_space; bool readonly; }; This should cause no behavioural change. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20170921085110.25598-7-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: Remove AddressSpace pointer from AddressSpaceDispatchAlexey Kardashevskiy2017-09-211-8/+7Star
| | | | | | | | | | | | | | | | | | | | | | AS in ASD is only used to pass AS from mem_begin() to register_subpage() to store it in MemoryRegionSection, we can do this directly now. This should cause no behavioural change. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20170921085110.25598-6-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: Move AddressSpaceDispatch from AddressSpace to FlatViewAlexey Kardashevskiy2017-09-214-44/+42Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As we are going to share FlatView's between AddressSpace's, and AddressSpaceDispatch is a structure to perform quick lookup in FlatView, this moves ASD to FlatView. After previosly open coded ASD rendering, we can also remove as->next_dispatch as the new FlatView pointer is stored on a stack and set to an AS atomically. flatview_destroy() is executed under RCU instead of address_space_dispatch_free() now. This makes mem_begin/mem_commit to work with ASD and mem_add with FV as later on mem_add will be taking FV as an argument anyway. This should cause no behavioural change. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20170921085110.25598-5-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: Move FlatView allocation to a helperAlexey Kardashevskiy2017-09-211-8/+8
| | | | | | | | | | | | | | | | | | | | | | | | This moves a FlatView allocation and initialization to a helper. While we are nere, replace g_new with g_new0 to not to bother if we add new fields in the future. This should cause no behavioural change. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20170921085110.25598-4-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: Open code FlatView renderingAlexey Kardashevskiy2017-09-214-32/+21Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We are going to share FlatView's between AddressSpace's and per-AS memory listeners won't suit the purpose anymore so open code the dispatch tree rendering. Since there is a good chance that dispatch_listener was the only listener, this avoids address_space_update_topology_pass() if there is no registered listeners; this should improve starting time. This should cause no behavioural change. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20170921085110.25598-3-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * exec: Explicitly export target AS from address_space_translate_internalAlexey Kardashevskiy2017-09-211-4/+7
| | | | | | | | | | | | | | | | | | | | | | This adds an AS** parameter to address_space_do_translate() to make it easier for the next patch to share FlatViews. This should cause no behavioural change. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20170921085110.25598-2-aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| * memory: avoid "resurrection" of dead FlatViewsPaolo Bonzini2017-09-213-4/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It's possible for address_space_get_flatview() as it currently stands to cause a use-after-free for the returned FlatView, if the reference count is incremented after the FlatView has been replaced by a writer: thread 1 thread 2 RCU thread ------------------------------------------------------------- rcu_read_lock read as->current_map set as->current_map flatview_unref '--> call_rcu flatview_ref [ref=1] rcu_read_unlock flatview_destroy <badness> Since FlatViews are not updated very often, we can just detect the situation using a new atomic op atomic_fetch_inc_nonzero, similar to Linux's atomic_inc_not_zero, which performs the refcount increment only if it hasn't already hit zero. This is similar to Linux commit de09a9771a53 ("CRED: Fix get_task_cred() and task_state() to not resurrect dead credentials", 2010-07-29). Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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