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2021-04-23net: check the existence of peer before trying to padJason Wang
There could be case that peer is NULL. This can happen when during network device hot-add where net device needs to be added first. So the patch check the existence of peer before trying to do the pad. Fixes: 969e50b61a285 ("net: Pad short frames to minimum size before sending from SLiRP/TAP") Signed-off-by: Jason Wang <jasowang@redhat.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Stefan Weil <sw@weilnetz.de> Message-id: 20210423031803.1479-1-jasowang@redhat.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-04-17include/qemu/osdep.h: Move system includes to topPeter Maydell
Mostly osdep.h puts the system includes at the top of the file; but there are a couple of exceptions where we include a system header halfway through the file. Move these up to the top with the rest so that all the system headers we include are included before we include os-win32.h or os-posix.h. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20210416135543.20382-4-peter.maydell@linaro.org Message-id: 20210414184343.26235-1-peter.maydell@linaro.org
2021-04-17osdep: protect qemu/osdep.h with extern "C"Paolo Bonzini
System headers may include templates if compiled with a C++ compiler, which cause the compiler to complain if qemu/osdep.h is included within a C++ source file's 'extern "C"' block. Add an 'extern "C"' block directly to qemu/osdep.h, so that system headers can be kept out of it. There is a stray declaration early in qemu/osdep.h, which needs to be special cased. Add a definition in qemu/compiler.h to make it look nice. config-host.h, CONFIG_TARGET, exec/poison.h and qemu/compiler.h are included outside the 'extern "C"' block; that is not an issue because they consist entirely of preprocessor directives. This allows us to move the include of osdep.h in our two C++ source files outside the extern "C" block they were previously using for it, which in turn means that they compile successfully against newer versions of glib which insist that glib.h is *not* inside an extern "C" block. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20210416135543.20382-3-peter.maydell@linaro.org [PMM: Moved disas/arm-a64.cc osdep.h include out of its extern "C" block; explained in commit message why we're doing this] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-04-17osdep: include glib-compat.h before other QEMU headersPaolo Bonzini
glib-compat.h is sort of like a system header, and it needs to include system headers (glib.h) that may dislike being included under 'extern "C"'. Move it right after all system headers and before all other QEMU headers. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20210416135543.20382-2-peter.maydell@linaro.org [PMM: Added comment about why glib-compat.h is special] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-04-13Merge remote-tracking branch 'remotes/dg-gitlab/tags/ppc-for-6.0-20210412' ↵Peter Maydell
into staging ppc patch queue for 2021-04-21 Here's what I hope is the last ppc related pull request for qemu-6.0. The 2 patches here revert a behavioural change that after further discussion we concluded was a bad idea (adding a timeout for possibly-failed hot unplug requests). Instead it implements a different approach to the original problem: we again let unplug requests the guest doesn't respond to remain pending indefinitely, but no longer allow those to block attempts to retry the same unplug again. The change is a bit more complex than I'd like for this late in the freeze. Nonetheless, I think it's important to merge this for 6.0, so we don't allow a release which has the probably-a-bad-idea timeout behaviour. # gpg: Signature made Mon 12 Apr 2021 06:25:58 BST # gpg: using RSA key 75F46586AE61A66CC44E87DC6C38CACA20D9B392 # gpg: Good signature from "David Gibson <david@gibson.dropbear.id.au>" [full] # gpg: aka "David Gibson (Red Hat) <dgibson@redhat.com>" [full] # gpg: aka "David Gibson (ozlabs.org) <dgibson@ozlabs.org>" [full] # gpg: aka "David Gibson (kernel.org) <dwg@kernel.org>" [unknown] # Primary key fingerprint: 75F4 6586 AE61 A66C C44E 87DC 6C38 CACA 20D9 B392 * remotes/dg-gitlab/tags/ppc-for-6.0-20210412: spapr.c: always pulse guest IRQ in spapr_core_unplug_request() spapr: rollback 'unplug timeout' for CPU hotunplugs Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-04-12esp: fix setting of ESPState mig_version_id when launching QEMU with -S optionMark Cave-Ayland
If QEMU is launched with the -S option then the ESPState mig_version_id property is left unset due to the ordering of the VMState fields in the VMStateDescription for sysbusespscsi and pciespscsi. If the VM is migrated and restored in this stopped state, the version tests in the vmstate_esp VMStateDescription and esp_post_load() become confused causing the migration to fail. Fix the ordering problem by moving the setting of mig_version_id to a common esp_pre_save() function which is invoked first by both sysbusespscsi and pciespscsi rather than at the point where ESPState is itself serialised into the migration stream. Buglink: https://bugs.launchpad.net/qemu/+bug/1922611 Fixes: 0bd005be78 ("esp: add vmstate_esp version to embedded ESPState") Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Reviewed-by: Thomas Huth <thuth@redhat.com> Message-Id: <20210407124842.32695-1-mark.cave-ayland@ilande.co.uk>
2021-04-12exec: Fix overlap of PAGE_ANON and PAGE_TARGET_1Richard Henderson
Unfortuately, the elements of PAGE_* were not in numerical order and so PAGE_ANON was added to an "unused" bit. As an arbitrary choice, move PAGE_TARGET_{1,2} together. Cc: Laurent Vivier <laurent@vivier.eu> Fixes: 26bab757d41b ("linux-user: Introduce PAGE_ANON") Buglink: https://bugs.launchpad.net/bugs/1922617 Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Tested-by: Laurent Vivier <laurent@vivier.eu> Tested-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-04-12spapr: rollback 'unplug timeout' for CPU hotunplugsDaniel Henrique Barboza
The pseries machines introduced the concept of 'unplug timeout' for CPU hotunplugs. The idea was to circunvent a deficiency in the pSeries specification (PAPR), that currently does not define a proper way for the hotunplug to fail. If the guest refuses to release the CPU (see [1] for an example) there is no way for QEMU to detect the failure. Further discussions about how to send a QAPI event to inform about the hotunplug timeout [2] exposed problems that weren't predicted back when the idea was developed. Other QEMU machines don't have any type of hotunplug timeout mechanism for any device, e.g. ACPI based machines have a way to make hotunplug errors visible to the hypervisor. This would make this timeout mechanism exclusive to pSeries, which is not ideal. The real problem is that a QAPI event that reports hotunplug timeouts puts the management layer (namely Libvirt) in a weird spot. We're not telling that the hotunplug failed, because we can't be 100% sure of that, and yet we're resetting the unplug state back, preventing any DEVICE_DEL events to reach out in case the guest decides to release the device. Libvirt would need to inspect the guest itself to see if the device was released or not, otherwise the internal domain states will be inconsistent. Moreover, Libvirt already has an 'unplug timeout' concept, and a QEMU side timeout would need to be juggled together with the existing Libvirt timeout. All this considered, this solution ended up creating more trouble than it solved. This patch reverts the 3 commits that introduced the timeout mechanism for CPU hotplugs in pSeries machines. This reverts commit 4515a5f786024fabf0bef4cf3d28adf5647e6e82 "qemu_timer.c: add timer_deadline_ms() helper" This reverts commit d1c2e3ce3d5a5424651967bce1cf1f4caa0c6d91 "spapr_drc.c: add hotunplug timeout for CPUs" This reverts commit 51254ffb320183a4636635840c23ee0e3a1efffa "spapr_drc.c: introduce unplug_timeout_timer" [1] https://bugzilla.redhat.com/show_bug.cgi?id=1911414 [2] https://lists.gnu.org/archive/html/qemu-devel/2021-03/msg04682.html CC: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20210401000437.131140-2-danielhb413@gmail.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2021-04-08Merge remote-tracking branch 'remotes/jasowang/tags/net-pull-request' into ↵Peter Maydell
staging # gpg: Signature made Thu 08 Apr 2021 10:34:24 BST # gpg: using RSA key EF04965B398D6211 # gpg: Good signature from "Jason Wang (Jason Wang on RedHat) <jasowang@redhat.com>" [marginal] # 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: 215D 46F4 8246 689E C77F 3562 EF04 965B 398D 6211 * remotes/jasowang/tags/net-pull-request: tap-win32: correctly recycle buffers Revert "qapi: net: Add query-netdev command" Revert "tests: Add tests for query-netdev command" Revert "net: Move NetClientState.info_str to dynamic allocations" Revert "hmp: Use QAPI NetdevInfo in hmp_info_network" Revert "net: Do not fill legacy info_str for backends" Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-04-08Merge remote-tracking branch ↵Peter Maydell
'remotes/dgilbert/tags/pull-migration-20210407b' into staging V2 migration+virtiofs fixes pull 2021-04-07 A seg fix in virtiofsd, a bunch of fixes for background snapshots, and a migration test fix. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> v2 Fix for !linux build # gpg: Signature made Wed 07 Apr 2021 18:53:13 BST # gpg: using RSA key 45F5C71B4A0CB7FB977A9FA90516331EBC5BFDE7 # gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>" [full] # Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A 9FA9 0516 331E BC5B FDE7 * remotes/dgilbert/tags/pull-migration-20210407b: tests/migration: fix parameter of auto-converge migration migration: Rename 'bs' to 'block' in background snapshot code migration: Pre-fault memory before starting background snasphot migration: Inhibit virtio-balloon for the duration of background snapshot migration: Fix missing qemu_fflush() on buffer file in bg_migration_thread virtiofsd: Fix security.capability comparison Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-04-08Revert "qapi: net: Add query-netdev command"Jason Wang
Several issues has been reported for query-netdev series. Consider it's late in the rc, this reverts commit d32ad10a14d46dfe9304e3ed5858a11dcd5c71a0. Signed-off-by: Jason Wang <jasowang@redhat.com>
2021-04-08Revert "net: Move NetClientState.info_str to dynamic allocations"Jason Wang
Several issues has been reported for query-netdev info series. Consider it's late in the rc, this reverts commit commit 59b5437eb732d6b103a9bc279c3482c834d1eff9. Signed-off-by: Jason Wang <jasowang@redhat.com>
2021-04-08Revert "hmp: Use QAPI NetdevInfo in hmp_info_network"Jason Wang
Several issues has been reported for query-netdev info series. Consider it's late in the rc, this reverts commit a0724776c5a98a08fc946bb5a4ad16410ca64c0e. Signed-off-by: Jason Wang <jasowang@redhat.com>
2021-04-07hw/block/nvme: fix handling of private namespacesKlaus Jensen
Prior to this patch, if a private nvme-ns device (that is, a namespace that is not linked to a subsystem) is wired up to an nvme-subsys linked nvme controller device, the device fails to verify that the namespace id is unique within the subsystem. NVM Express v1.4b, Section 6.1.6 ("NSID and Namespace Usage") states that because the device supports Namespace Management, "NSIDs *shall* be unique within the NVM subsystem". Additionally, prior to this patch, private namespaces are not known to the subsystem and the namespace is considered exclusive to the controller with which it is initially wired up to. However, this is not the definition of a private namespace; per Section 1.6.33 ("private namespace"), a private namespace is just a namespace that does not support multipath I/O or namespace sharing, which means "that it is only able to be attached to one controller at a time". Fix this by always allocating namespaces in the subsystem (if one is linked to the controller), regardless of the shared/private status of the namespace. Whether or not the namespace is shareable is controlled by a new `shared` nvme-ns parameter. Finally, this fix allows the nvme-ns `subsys` parameter to be removed, since the `shared` parameter now serves the purpose of attaching the namespace to all controllers in the subsystem upon device realization. It is invalid to have an nvme-ns namespace device with a linked subsystem without the parent nvme controller device also being linked to one and since the nvme-ns devices will unconditionally be "attached" (in QEMU terms that is) to an nvme controller device through an NvmeBus, the nvme-ns namespace device can always get a reference to the subsystem of the controller it is explicitly (using 'bus=' parameter) or implicitly attaching to. Fixes: e570768566b3 ("hw/block/nvme: support for shared namespace in subsystem") Cc: Minwoo Im <minwoo.im.dev@gmail.com> Signed-off-by: Klaus Jensen <k.jensen@samsung.com> Reviewed-by: Gollu Appalanaidu <anaidu.gollu@samsung.com> Reviewed-by: Keith Busch <kbusch@kernel.org> Reviewed-by: Minwoo Im <minwoo.im.dev@gmail.com>
2021-04-06migration: Inhibit virtio-balloon for the duration of background snapshotAndrey Gruzdev
The same thing as for incoming postcopy - we cannot deal with concurrent RAM discards when using background snapshot feature in outgoing migration. Fixes: 8518278a6af589ccc401f06e35f171b1e6fae800 (migration: implementation of background snapshot thread) Signed-off-by: Andrey Gruzdev <andrey.gruzdev@virtuozzo.com> Reported-by: David Hildenbrand <david@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> Message-Id: <20210401092226.102804-3-andrey.gruzdev@virtuozzo.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-04-06Merge remote-tracking branch ↵Peter Maydell
'remotes/pmaydell/tags/pull-target-arm-20210406' into staging target-arm queue: * ppc/e500 and arm/virt: only add valid dynamic sysbus devices to the platform bus * update i.mx31 maintainer list * Revert "target/arm: Make number of counters in PMCR follow the CPU" # gpg: Signature made Tue 06 Apr 2021 13:25:54 BST # gpg: using RSA key E1A5C593CD419DE28E8315CF3C2525ED14360CDE # gpg: issuer "peter.maydell@linaro.org" # gpg: Good signature from "Peter Maydell <peter.maydell@linaro.org>" [ultimate] # gpg: aka "Peter Maydell <pmaydell@gmail.com>" [ultimate] # gpg: aka "Peter Maydell <pmaydell@chiark.greenend.org.uk>" [ultimate] # Primary key fingerprint: E1A5 C593 CD41 9DE2 8E83 15CF 3C25 25ED 1436 0CDE * remotes/pmaydell/tags/pull-target-arm-20210406: Remove myself as i.mx31 maintainer Revert "target/arm: Make number of counters in PMCR follow the CPU" hw/ppc/e500plat: Only try to add valid dynamic sysbus devices to platform bus hw/arm/virt: Only try to add valid dynamic sysbus devices to platform bus machine: Provide a function to check the dynamic sysbus allowlist include/hw/boards.h: Document machine_class_allow_dynamic_sysbus_dev() Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-04-06virtio-pci: compat page aligned ATSJason Wang
Commit 4c70875372b8 ("pci: advertise a page aligned ATS") advertises the page aligned via ATS capability (RO) to unbrek recent Linux IOMMU drivers since 5.2. But it forgot the compat the capability which breaks the migration from old machine type: (qemu) qemu-kvm: get_pci_config_device: Bad config data: i=0x104 read: 0 device: 20 cmask: ff wmask: 0 w1cmask:0 This patch introduces a new parameter "x-ats-page-aligned" for virtio-pci device and turns it on for machine type which is newer than 5.1. Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Peter Xu <peterx@redhat.com> Cc: Dr. David Alan Gilbert <dgilbert@redhat.com> Cc: qemu-stable@nongnu.org Fixes: 4c70875372b8 ("pci: advertise a page aligned ATS") Signed-off-by: Jason Wang <jasowang@redhat.com> Message-Id: <20210406040330.11306-1-jasowang@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2021-04-06machine: Provide a function to check the dynamic sysbus allowlistPeter Maydell
Provide a new function dynamic_sysbus_dev_allowed() which checks the per-machine list of permitted dynamic sysbus devices and returns a boolean result indicating whether the device is allowed. We can use this in the implementation of validate_sysbus_device(), but we will also need it so that machine hotplug callbacks can validate devices rather than assuming that any sysbus device might be hotpluggable into the platform bus. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Reviewed-by: Eric Auger <eric.auger@redhat.com> Message-id: 20210325153310.9131-3-peter.maydell@linaro.org
2021-04-06include/hw/boards.h: Document machine_class_allow_dynamic_sysbus_dev()Peter Maydell
The function machine_class_allow_dynamic_sysbus_dev() is currently undocumented; add a doc comment. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Reviewed-by: Eric Auger <eric.auger@redhat.com> Message-id: 20210325153310.9131-2-peter.maydell@linaro.org
2021-04-04x86: rename oem-id and oem-table-id propertiesPaolo Bonzini
After introducing non-scalar machine properties, it would be preferrable to have a single acpitable property which includes both generic information (such as the OEM ids) and custom tables currently passed via -acpitable. Do not saddle ourselves with legacy oem-id and oem-table-id properties, instead mark them as experimental. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20210402082128.13854-1-pbonzini@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2021-04-01Merge remote-tracking branch 'remotes/marcandre/tags/for-6.0-pull-request' ↵Peter Maydell
into staging For 6.0 misc patches under my radar. V2: - "tests: Add tests for yank with the chardev-change case" updated - drop the readthedoc theme patch # gpg: Signature made Thu 01 Apr 2021 12:54:52 BST # gpg: using RSA key 87A9BD933F87C606D276F62DDAE8E10975969CE5 # gpg: issuer "marcandre.lureau@redhat.com" # gpg: Good signature from "Marc-André Lureau <marcandre.lureau@redhat.com>" [full] # gpg: aka "Marc-André Lureau <marcandre.lureau@gmail.com>" [full] # Primary key fingerprint: 87A9 BD93 3F87 C606 D276 F62D DAE8 E109 7596 9CE5 * remotes/marcandre/tags/for-6.0-pull-request: tests: Add tests for yank with the chardev-change case chardev: Fix yank with the chardev-change case chardev/char.c: Always pass id to chardev_new chardev/char.c: Move object_property_try_add_child out of chardev_new yank: Always link full yank code yank: Remove dependency on qiochannel docs: simplify each section title dbus-vmstate: Increase the size of input stream buffer used during load util: fix use-after-free in module_load_one Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-04-01chardev: Fix yank with the chardev-change caseLukas Straub
When changing from chardev-socket (which supports yank) to chardev-socket again, it fails, because the new chardev attempts to register a new yank instance. This in turn fails, as there still is the yank instance from the current chardev. Also, the old chardev shouldn't unregister the yank instance when it is freed. To fix this, now the new chardev only registers a yank instance if the current chardev doesn't support yank and thus hasn't registered one already. Also, when the old chardev is freed, it now only unregisters the yank instance if the new chardev doesn't need it. If the initialization of the new chardev fails, it still has chr->handover_yank_instance set and won't unregister the yank instance when it is freed. s->registered_yank is always true here, as chardev-change only works on user-visible chardevs and those are guraranteed to register a yank instance as they are initialized via chardev_new() qemu_char_open() cc->open() (qmp_chardev_open_socket()). Signed-off-by: Lukas Straub <lukasstraub2@web.de> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Tested-by: Li Zhang <li.zhang@cloud.ionos.com> Message-Id: <9637888d7591d2971975188478bb707299a1dc04.1617127849.git.lukasstraub2@web.de>
2021-04-01yank: Remove dependency on qiochannelLukas Straub
Remove dependency on qiochannel by removing yank_generic_iochannel and letting migration and chardev use their own yank function for iochannel. Signed-off-by: Lukas Straub <lukasstraub2@web.de> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20ff143fc2db23e27cd41d38043e481376c9cec1.1616521341.git.lukasstraub2@web.de>
2021-03-31Merge remote-tracking branch ↵Peter Maydell
'remotes/stefanha-gitlab/tags/block-pull-request' into staging Pull request A fix for VDI image files and more generally for CoRwlock. # gpg: Signature made Wed 31 Mar 2021 10:50:39 BST # gpg: using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8 # gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full] # gpg: aka "Stefan Hajnoczi <stefanha@gmail.com>" [full] # Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35 775A 9CA4 ABB3 81AB 73C8 * remotes/stefanha-gitlab/tags/block-pull-request: test-coroutine: Add rwlock downgrade test test-coroutine: Add rwlock upgrade test coroutine-lock: Reimplement CoRwlock to fix downgrade bug coroutine-lock: Store the coroutine in the CoWaitRecord only once block/vdi: Don't assume that blocks are larger than VdiHeader block/vdi: When writing new bmap entry fails, don't leak the buffer Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-03-31coroutine-lock: Reimplement CoRwlock to fix downgrade bugPaolo Bonzini
An invariant of the current rwlock is that if multiple coroutines hold a reader lock, all must be runnable. The unlock implementation relies on this, choosing to wake a single coroutine when the final read lock holder exits the critical section, assuming that it will wake a coroutine attempting to acquire a write lock. The downgrade implementation violates this assumption by creating a read lock owning coroutine that is exclusively runnable - any other coroutines that are waiting to acquire a read lock are *not* made runnable when the write lock holder converts its ownership to read only. More in general, the old implementation had lots of other fairness bugs. The root cause of the bugs was that CoQueue would wake up readers even if there were pending writers, and would wake up writers even if there were readers. In that case, the coroutine would go back to sleep *at the end* of the CoQueue, losing its place at the head of the line. To fix this, keep the queue of waiters explicitly in the CoRwlock instead of using CoQueue, and store for each whether it is a potential reader or a writer. This way, downgrade can look at the first queued coroutines and wake it only if it is a reader, causing all other readers in line to be released in turn. Reported-by: David Edmondson <david.edmondson@oracle.com> Reviewed-by: David Edmondson <david.edmondson@oracle.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 20210325112941.365238-5-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-03-31spapr: Fix typo in the patb_entry commentAlexey Kardashevskiy
There is no H_REGISTER_PROCESS_TABLE, it is H_REGISTER_PROC_TBL handler for which is still called h_register_process_table() though. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20210225032335.64245-1-aik@ozlabs.ru> Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2021-03-26s390x: move S390_ADAPTER_SUPPRESSIBLEGerd Hoffmann
The definition S390_ADAPTER_SUPPRESSIBLE was moved to "cpu.h", per suggestion of Thomas Huth. From interface design perspective, IMHO, not a good thing as it belongs to the public interface of css_register_io_adapters(). We did this because CONFIG_KVM requeires NEED_CPU_H and Thomas, and other commenters did not like the consequences of that. Moving the interrupt related declarations to s390_flic.h was suggested by Cornelia Huck. Signed-off-by: Halil Pasic <pasic@linux.ibm.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Halil Pasic <pasic@linux.ibm.com> Tested-by: Halil Pasic <pasic@linux.ibm.com> Message-Id: <20210317095622.2839895-2-kraxel@redhat.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2021-03-24m68k: add the virtio devices aliasesLaurent Vivier
Similarly to 5f629d943cb0 ("s390x: fix s390 virtio aliases"), define the virtio aliases. This allows to start machines with virtio devices without knowledge of the implementation type. For instance, we can use "-device virtio-scsi" on m68k, s390x or PC, and the device will be respectively "virtio-scsi-device", "virtio-scsi-ccw" or "virtio-scsi-pci". This already exists for s390x and -ccw interfaces, add them for m68k and MMIO (-device) interfaces. Signed-off-by: Laurent Vivier <laurent@vivier.eu> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Message-Id: <20210319202335.2397060-3-laurent@vivier.eu> Message-Id: <20210323165308.15244-18-alex.bennee@linaro.org>
2021-03-24qdev: define list of archs with virtio-pci or virtio-ccwLaurent Vivier
This is used to define virtio-*-pci and virtio-*-ccw aliases rather than substracting the CCW architecture from all the others. Signed-off-by: Laurent Vivier <laurent@vivier.eu> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Message-Id: <20210319202335.2397060-2-laurent@vivier.eu> Message-Id: <20210323165308.15244-17-alex.bennee@linaro.org>
2021-03-24Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20210323' into stagingPeter Maydell
Workaround for macos mprotect Workaround for target_page vs -flto # gpg: Signature made Wed 24 Mar 2021 01:40:12 GMT # gpg: using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F # gpg: issuer "richard.henderson@linaro.org" # gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [full] # Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A 05C0 64DF 38E8 AF7E 215F * remotes/rth/tags/pull-tcg-20210323: exec: Build page-vary-common.c with -fno-lto exec: Extract 'page-vary.h' header exec: Rename exec-vary.c as page-vary.c tcg: Workaround macOS 11.2 mprotect bug tcg: Do not set guard pages on the rx portion of code_gen_buffer Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-03-23exec: Build page-vary-common.c with -fno-ltoRichard Henderson
In bbc17caf81f, we used an alias attribute to allow target_page to be declared const, and yet be initialized late. This fails when using LTO with several versions of gcc. The compiler looks through the alias and decides that the const variable is statically initialized to zero, then propagates that zero to many uses of the variable. This can be avoided by compiling one object file with -fno-lto. In this way, any initializer cannot be seen, and the constant propagation does not occur. Since we are certain to have this separate compilation unit, we can drop the alias attribute as well. We simply have differing declarations for target_page in different compilation units. Drop the use of init_target_page, and drop the configure detection for CONFIG_ATTRIBUTE_ALIAS. In order to change the compilation flags for a file with meson, we must use a static_library. This runs into specific_ss, where we would need to create many static_library instances. Fix this by splitting page-vary.c: the page-vary-common.c part is compiled once as a static_library, while the page-vary.c part is left in specific_ss in order to handle the target-specific value of TARGET_PAGE_BITS_MIN. Reported-by: Gavin Shan <gshan@redhat.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20210321211534.2101231-1-richard.henderson@linaro.org> [PMD: Fix typo in subject, split original patch in 3] Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Tested-by: Gavin Shan <gshan@redhat.com> Message-Id: <20210322112427.4045204-4-f4bug@amsat.org> [rth: Update MAINTAINERS] Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2021-03-23exec: Extract 'page-vary.h' headerRichard Henderson
In the next commit we will extract the generic code out of page-vary.c, only keeping the target specific code. Both files will use the same TargetPageBits structure, so make its declaration in a shared header. As the common header can not use target specific types, use a uint64_t to hold the page mask value, and add a cast back to target_long in the TARGET_PAGE_MASK definitions. Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20210322112427.4045204-3-f4bug@amsat.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2021-03-23Merge remote-tracking branch 'remotes/kraxel/tags/ui-20210323-pull-request' ↵Peter Maydell
into staging fixes for 6.0 # gpg: Signature made Tue 23 Mar 2021 15:36:06 GMT # gpg: using RSA key A0328CFFB93A17A79901FE7D4CB6D8EED3E87138 # gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>" [full] # gpg: aka "Gerd Hoffmann <gerd@kraxel.org>" [full] # gpg: aka "Gerd Hoffmann (private) <kraxel@gmail.com>" [full] # Primary key fingerprint: A032 8CFF B93A 17A7 9901 FE7D 4CB6 D8EE D3E8 7138 * remotes/kraxel/tags/ui-20210323-pull-request: edid: prefer standard timings include/ui/console.h: Delete is_surface_bgr() qmp: add new qmp display-reload vnc: support reload x509 certificates for vnc crypto: add reload for QCryptoTLSCredsClass Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-03-23Merge remote-tracking branch ↵Peter Maydell
'remotes/pmaydell/tags/pull-target-arm-20210323' into staging target-arm queue: * hw/arm/virt: Disable pl011 clock migration if needed * target/arm: Make M-profile VTOR loads on reset handle memory aliasing * target/arm: Set ARMMMUFaultInfo.level in user-only arm_cpu_tlb_fill # gpg: Signature made Tue 23 Mar 2021 14:26:09 GMT # gpg: using RSA key E1A5C593CD419DE28E8315CF3C2525ED14360CDE # gpg: issuer "peter.maydell@linaro.org" # gpg: Good signature from "Peter Maydell <peter.maydell@linaro.org>" [ultimate] # gpg: aka "Peter Maydell <pmaydell@gmail.com>" [ultimate] # gpg: aka "Peter Maydell <pmaydell@chiark.greenend.org.uk>" [ultimate] # Primary key fingerprint: E1A5 C593 CD41 9DE2 8E83 15CF 3C25 25ED 1436 0CDE * remotes/pmaydell/tags/pull-target-arm-20210323: target/arm: Set ARMMMUFaultInfo.level in user-only arm_cpu_tlb_fill target/arm: Make M-profile VTOR loads on reset handle memory aliasing hw/core/loader: Add new function rom_ptr_for_as() memory: Add offset_in_region to flatview_cb arguments memory: Document flatview_for_each_range() memory: Make flatview_cb return bool, not int hw/arm/virt: Disable pl011 clock migration if needed Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-03-23Merge remote-tracking branch ↵Peter Maydell
'remotes/alistair/tags/pull-riscv-to-apply-20210322-2' into staging RISC-V PR for 6.0 This PR includes: - Fix for vector CSR access - Improvements to the Ibex UART device - PMP improvements and bug fixes - Hypervisor extension bug fixes - ramfb support for the virt machine - Fast read support for SST flash - Improvements to the microchip_pfsoc machine # gpg: Signature made Tue 23 Mar 2021 01:56:53 GMT # gpg: using RSA key F6C4AC46D4934868D3B8CE8F21E10D29DF977054 # gpg: Good signature from "Alistair Francis <alistair@alistair23.me>" [full] # Primary key fingerprint: F6C4 AC46 D493 4868 D3B8 CE8F 21E1 0D29 DF97 7054 * remotes/alistair/tags/pull-riscv-to-apply-20210322-2: target/riscv: Prevent lost illegal instruction exceptions docs/system: riscv: Add documentation for 'microchip-icicle-kit' machine hw/riscv: microchip_pfsoc: Map EMMC/SD mux register hw/block: m25p80: Support fast read for SST flashes target/riscv: Add proper two-stage lookup exception detection target/riscv: Fix read and write accesses to vsip and vsie hw/riscv: allow ramfb on virt hw/riscv: Add fw_cfg support to virt target/riscv: Use background registers also for MSTATUS_MPV target/riscv: Make VSTIP and VSEIP read-only in hip target/riscv: Adjust privilege level for HLV(X)/HSV instructions target/riscv: flush TLB pages if PMP permission has been changed target/riscv: add log of PMP permission checking target/riscv: propagate PMP permission to TLB page hw/char: disable ibex uart receive if the buffer is full target/riscv: fix vs() to return proper error code Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-03-23hw/core/loader: Add new function rom_ptr_for_as()Peter Maydell
For accesses to rom blob data before or during reset, we have a function rom_ptr() which looks for a rom blob that would be loaded to the specified address, and returns a pointer into the rom blob data corresponding to that address. This allows board or CPU code to say "what is the data that is going to be loaded to this address?". However, this function does not take account of memory region aliases. If for instance a machine model has RAM at address 0x0000_0000 which is aliased to also appear at 0x1000_0000, a rom_ptr() query for address 0x0000_0000 will only return a match if the guest image provided by the user was loaded at 0x0000_0000 and not if it was loaded at 0x1000_0000, even though they are the same RAM and a run-time guest CPU read of 0x0000_0000 will read the data loaded to 0x1000_0000. Provide a new function rom_ptr_for_as() which takes an AddressSpace argument, so that it can check whether the MemoryRegion corresponding to the address is also mapped anywhere else in the AddressSpace and look for rom blobs that loaded to that alias. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20210318174823.18066-5-peter.maydell@linaro.org
2021-03-23memory: Add offset_in_region to flatview_cb argumentsPeter Maydell
The function flatview_for_each_range() calls a callback for each range in a FlatView. Currently the callback gets the start and length of the range and the MemoryRegion involved, but not the offset within the MemoryRegion. Add this to the callback's arguments; we're going to want it for a new use in the next commit. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-id: 20210318174823.18066-4-peter.maydell@linaro.org
2021-03-23memory: Document flatview_for_each_range()Peter Maydell
Add a documentation comment describing flatview_for_each_range(). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-id: 20210318174823.18066-3-peter.maydell@linaro.org
2021-03-23memory: Make flatview_cb return bool, not intPeter Maydell
The return value of the flatview_cb callback passed to the flatview_for_each_range() function is zero if the iteration through the ranges should continue, or non-zero to break out of it. Use a bool for this rather than int. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-id: 20210318174823.18066-2-peter.maydell@linaro.org
2021-03-23hw/arm/virt: Disable pl011 clock migration if neededGavin Shan
A clock is added by commit aac63e0e6ea3 ("hw/char/pl011: add a clock input") since v5.2.0 which corresponds to virt-5.2 machine type. It causes backwards migration failure from upstream to downstream (v5.1.0) when the machine type is specified with virt-5.1. This fixes the issue by following instructions from section "Connecting subsections to properties" in docs/devel/migration.rst. With this applied, the PL011 clock is migrated based on the machine type. virt-5.2 or newer: migration virt-5.1 or older: non-migration Cc: qemu-stable@nongnu.org # v5.2.0+ Fixes: aac63e0e6ea3 ("hw/char/pl011: add a clock input") Suggested-by: Andrew Jones <drjones@redhat.com> Signed-off-by: Gavin Shan <gshan@redhat.com> Reviewed-by: Andrew Jones <drjones@redhat.com> Message-id: 20210318023801.18287-1-gshan@redhat.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-03-23Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into stagingPeter Maydell
pc,virtio,pci: fixes, features Fixes all over the place. ACPI index support. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> # gpg: Signature made Mon 22 Mar 2021 22:58:45 GMT # gpg: using RSA key 5D09FD0871C8F85B94CA8A0D281F0DB8D28D5469 # gpg: issuer "mst@redhat.com" # gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>" [full] # gpg: aka "Michael S. Tsirkin <mst@redhat.com>" [full] # Primary key fingerprint: 0270 606B 6F3C DF3D 0B17 0970 C350 3912 AFBE 8E67 # Subkey fingerprint: 5D09 FD08 71C8 F85B 94CA 8A0D 281F 0DB8 D28D 5469 * remotes/mst/tags/for_upstream: acpi: Move setters/getters of oem fields to X86MachineState acpi: Set proper maximum size for "etc/acpi/rsdp" blob acpi: Move maximum size logic into acpi_add_rom_blob() microvm: Don't open-code "etc/table-loader" acpi: Set proper maximum size for "etc/table-loader" blob tests: acpi: update expected blobs pci: acpi: add _DSM method to PCI devices acpi: add aml_to_decimalstring() and aml_call6() helpers pci: acpi: ensure that acpi-index is unique pci: introduce acpi-index property for PCI device tests: acpi: temporary whitelist DSDT changes virtio-pmem: fix virtio_pmem_resp assign problem vhost-user: Monitor slave channel in vhost_user_read() vhost-user: Introduce nested event loop in vhost_user_read() vhost-user: Convert slave channel to QIOChannelSocket vhost-user: Factor out duplicated slave_fd teardown code vhost-user: Fix double-close on slave_read() error path vhost-user: Drop misleading EAGAIN checks in slave_read() virtio: Fix virtio_mmio_read()/virtio_mmio_write() Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-03-23include/ui/console.h: Delete is_surface_bgr()Peter Maydell
The function is_surface_bgr() is no longer used anywhere, so we can delete it. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20210314163927.1184-1-peter.maydell@linaro.org> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2021-03-23vnc: support reload x509 certificates for vncZihao Chang
This patch add vnc_display_reload_certs() to support update x509 certificates. Signed-off-by: Zihao Chang <changzihao1@huawei.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20210316075845.1476-3-changzihao1@huawei.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2021-03-23crypto: add reload for QCryptoTLSCredsClassZihao Chang
This patch adds reload interface for QCryptoTLSCredsClass and implements the interface for QCryptoTLSCredsX509. Signed-off-by: Zihao Chang <changzihao1@huawei.com> Acked-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20210316075845.1476-2-changzihao1@huawei.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2021-03-22hw/riscv: microchip_pfsoc: Map EMMC/SD mux registerBin Meng
Since HSS commit c20a89f8dcac, the Icicle Kit reference design has been updated to use a register mapped at 0x4f000000 instead of a GPIO to control whether eMMC or SD card is to be used. With this support the same HSS image can be used for both eMMC and SD card boot flow, while previously two different board configurations were used. This is undocumented but one can take a look at the HSS code HSS_MMCInit() in services/mmc/mmc_api.c. With this commit, HSS image built from 2020.12 release boots again. Signed-off-by: Bin Meng <bin.meng@windriver.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20210322075248.136255-1-bmeng.cn@gmail.com Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2021-03-22hw/riscv: Add fw_cfg support to virtAsherah Connor
Provides fw_cfg for the virt machine on riscv. This enables using e.g. ramfb later. Signed-off-by: Asherah Connor <ashe@kivikakk.ee> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20210318235041.17175-2-ashe@kivikakk.ee Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2021-03-22hw/char: disable ibex uart receive if the buffer is fullAlexander Wagner
Not disabling the UART leads to QEMU overwriting the UART receive buffer with the newest received byte. The rx_level variable is added to allow the use of the existing OpenTitan driver libraries. Signed-off-by: Alexander Wagner <alexander.wagner@ulal.de> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20210309152130.13038-1-alexander.wagner@ulal.de Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2021-03-22acpi: Move setters/getters of oem fields to X86MachineStateMarian Postevca
The code that sets/gets oem fields is duplicated in both PC and MICROVM variants. This commit moves it to X86MachineState so that all x86 variants can use it and duplication is removed. Signed-off-by: Marian Postevca <posteuca@mutex.one> Message-Id: <20210221001737.24499-2-posteuca@mutex.one> Reviewed-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2021-03-22acpi: Move maximum size logic into acpi_add_rom_blob()David Hildenbrand
We want to have safety margins for all tables based on the table type. Let's move the maximum size logic into acpi_add_rom_blob() and make it dependent on the table name, so we don't have to replicate for each and every instance that creates such tables. Suggested-by: Laszlo Ersek <lersek@redhat.com> Cc: Alistair Francis <alistair.francis@xilinx.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Peter Maydell <peter.maydell@linaro.org> Cc: Shannon Zhao <shannon.zhaosl@gmail.com> Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Richard Henderson <richard.henderson@linaro.org> Cc: Laszlo Ersek <lersek@redhat.com> Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20210304105554.121674-4-david@redhat.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2021-03-22acpi: Set proper maximum size for "etc/table-loader" blobDavid Hildenbrand
The resizeable memory region / RAMBlock that is created for the cmd blob has a maximum size of whole host pages (e.g., 4k), because RAMBlocks work on full host pages. In addition, in i386 ACPI code: acpi_align_size(tables->linker->cmd_blob, ACPI_BUILD_ALIGN_SIZE); makes sure to align to multiples of 4k, padding with 0. For example, if our cmd_blob is created with a size of 2k, the maximum size is 4k - we cannot grow beyond that. Growing might be required due to guest action when rebuilding the tables, but also on incoming migration. This automatic generation of the maximum size used to be sufficient, however, there are cases where we cross host pages now when growing at runtime: we exceed the maximum size of the RAMBlock and can crash QEMU when trying to resize the resizeable memory region / RAMBlock: $ build/qemu-system-x86_64 --enable-kvm \ -machine q35,nvdimm=on \ -smp 1 \ -cpu host \ -m size=2G,slots=8,maxmem=4G \ -object memory-backend-file,id=mem0,mem-path=/tmp/nvdimm,size=256M \ -device nvdimm,label-size=131072,memdev=mem0,id=nvdimm0,slot=1 \ -nodefaults \ -device vmgenid \ -device intel-iommu Results in: Unexpected error in qemu_ram_resize() at ../softmmu/physmem.c:1850: qemu-system-x86_64: Size too large: /rom@etc/table-loader: 0x2000 > 0x1000: Invalid argument In this configuration, we consume exactly 4k (32 entries, 128 bytes each) when creating the VM. However, once the guest boots up and maps the MCFG, we also create the MCFG table and end up consuming 2 additional entries (pointer + checksum) -- which is where we try resizing the memory region / RAMBlock, however, the maximum size does not allow for it. Currently, we get the following maximum sizes for our different mutable tables based on behavior of resizeable RAMBlock: hw table max_size ------- --------------------------------------------------------- virt "etc/acpi/tables" ACPI_BUILD_TABLE_MAX_SIZE (0x200000) virt "etc/table-loader" HOST_PAGE_ALIGN(initial_size) virt "etc/acpi/rsdp" HOST_PAGE_ALIGN(initial_size) i386 "etc/acpi/tables" ACPI_BUILD_TABLE_MAX_SIZE (0x200000) i386 "etc/table-loader" HOST_PAGE_ALIGN(initial_size) i386 "etc/acpi/rsdp" HOST_PAGE_ALIGN(initial_size) microvm "etc/acpi/tables" ACPI_BUILD_TABLE_MAX_SIZE (0x200000) microvm "etc/table-loader" HOST_PAGE_ALIGN(initial_size) microvm "etc/acpi/rsdp" HOST_PAGE_ALIGN(initial_size) Let's set the maximum table size for "etc/table-loader" to 64k, so we can properly grow at runtime, which should be good enough for the future. Migration is not concerned with the maximum size of a RAMBlock, only with the used size - so existing setups are not affected. Of course, we cannot migrate a VM that would have crash when started on older QEMU from new QEMU to older QEMU without failing early on the destination when synchronizing the RAM state: qemu-system-x86_64: Size too large: /rom@etc/table-loader: 0x2000 > 0x1000: Invalid argument qemu-system-x86_64: error while loading state for instance 0x0 of device 'ram' qemu-system-x86_64: load of migration failed: Invalid argument We'll refactor the code next, to make sure we get rid of this implicit behavior for "etc/acpi/rsdp" as well and to make the code easier to grasp. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Cc: Alistair Francis <alistair.francis@xilinx.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Peter Maydell <peter.maydell@linaro.org> Cc: Shannon Zhao <shannon.zhaosl@gmail.com> Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Richard Henderson <richard.henderson@linaro.org> Cc: Laszlo Ersek <lersek@redhat.com> Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20210304105554.121674-2-david@redhat.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>