Migration pull for 9.0-rc0
- Nicholas/Phil's fix on migration corruption / inconsistent for tcg - Cedric's fix on block migration over n_sectors==0 - Steve's CPR reboot documentation page - Fabiano's misc fixes on mapped-ram (IOC leak, dup() errors, fd checks, fd use race, etc.) -----BEGIN PGP SIGNATURE----- iIgEABYKADAWIQS5GE3CDMRX2s990ak7X8zN86vXBgUCZfdZEhIccGV0ZXJ4QHJl ZGhhdC5jb20ACgkQO1/MzfOr1wa+1AEA0+f7nCssvsILvCY9KifYO+OUJsLodUuQ JW0JBz+1iPMA+wSiyIVl2Xg78Q97nJxv71UJf+1cDJENA5EMmXMnxmYK =SLnA -----END PGP SIGNATURE----- Merge tag 'migration-20240317-pull-request' of https://gitlab.com/peterx/qemu into staging Migration pull for 9.0-rc0 - Nicholas/Phil's fix on migration corruption / inconsistent for tcg - Cedric's fix on block migration over n_sectors==0 - Steve's CPR reboot documentation page - Fabiano's misc fixes on mapped-ram (IOC leak, dup() errors, fd checks, fd use race, etc.) # -----BEGIN PGP SIGNATURE----- # # iIgEABYKADAWIQS5GE3CDMRX2s990ak7X8zN86vXBgUCZfdZEhIccGV0ZXJ4QHJl # ZGhhdC5jb20ACgkQO1/MzfOr1wa+1AEA0+f7nCssvsILvCY9KifYO+OUJsLodUuQ # JW0JBz+1iPMA+wSiyIVl2Xg78Q97nJxv71UJf+1cDJENA5EMmXMnxmYK # =SLnA # -----END PGP SIGNATURE----- # gpg: Signature made Sun 17 Mar 2024 20:56:50 GMT # gpg: using EDDSA key B9184DC20CC457DACF7DD1A93B5FCCCDF3ABD706 # gpg: issuer "peterx@redhat.com" # gpg: Good signature from "Peter Xu <xzpeter@gmail.com>" [marginal] # gpg: aka "Peter Xu <peterx@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: B918 4DC2 0CC4 57DA CF7D D1A9 3B5F CCCD F3AB D706 * tag 'migration-20240317-pull-request' of https://gitlab.com/peterx/qemu: migration/multifd: Duplicate the fd for the outgoing_args migration/multifd: Ensure we're not given a socket for file migration migration: Fix iocs leaks during file and fd migration migration: cpr-reboot documentation migration: Skip only empty block devices physmem: Fix migration dirty bitmap coherency with TCG memory access physmem: Factor cpu_physical_memory_dirty_bits_cleared() out physmem: Expose tlb_reset_dirty_range_all() migration: Fix error handling after dup in file migration io: Introduce qio_channel_file_new_dupfd Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell
commit
c6ea92aab8
147
docs/devel/migration/CPR.rst
Normal file
147
docs/devel/migration/CPR.rst
Normal file
@ -0,0 +1,147 @@
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CheckPoint and Restart (CPR)
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============================
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CPR is the umbrella name for a set of migration modes in which the
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VM is migrated to a new QEMU instance on the same host. It is
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intended for use when the goal is to update host software components
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that run the VM, such as QEMU or even the host kernel. At this time,
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cpr-reboot is the only available mode.
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Because QEMU is restarted on the same host, with access to the same
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local devices, CPR is allowed in certain cases where normal migration
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would be blocked. However, the user must not modify the contents of
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guest block devices between quitting old QEMU and starting new QEMU.
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CPR unconditionally stops VM execution before memory is saved, and
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thus does not depend on any form of dirty page tracking.
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cpr-reboot mode
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---------------
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In this mode, QEMU stops the VM, and writes VM state to the migration
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URI, which will typically be a file. After quitting QEMU, the user
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resumes by running QEMU with the ``-incoming`` option. Because the
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old and new QEMU instances are not active concurrently, the URI cannot
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be a type that streams data from one instance to the other.
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Guest RAM can be saved in place if backed by shared memory, or can be
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copied to a file. The former is more efficient and is therefore
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preferred.
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After state and memory are saved, the user may update userland host
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software before restarting QEMU and resuming the VM. Further, if
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the RAM is backed by persistent shared memory, such as a DAX device,
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then the user may reboot to a new host kernel before restarting QEMU.
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This mode supports VFIO devices provided the user first puts the
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guest in the suspended runstate, such as by issuing the
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``guest-suspend-ram`` command to the QEMU guest agent. The agent
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must be pre-installed in the guest, and the guest must support
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suspend to RAM. Beware that suspension can take a few seconds, so
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the user should poll to see the suspended state before proceeding
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with the CPR operation.
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Usage
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^^^^^
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It is recommended that guest RAM be backed with some type of shared
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memory, such as ``memory-backend-file,share=on``, and that the
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``x-ignore-shared`` capability be set. This combination allows memory
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to be saved in place. Otherwise, after QEMU stops the VM, all guest
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RAM is copied to the migration URI.
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Outgoing:
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* Set the migration mode parameter to ``cpr-reboot``.
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* Set the ``x-ignore-shared`` capability if desired.
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* Issue the ``migrate`` command. It is recommended the the URI be a
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``file`` type, but one can use other types such as ``exec``,
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provided the command captures all the data from the outgoing side,
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and provides all the data to the incoming side.
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* Quit when QEMU reaches the postmigrate state.
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Incoming:
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* Start QEMU with the ``-incoming defer`` option.
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* Set the migration mode parameter to ``cpr-reboot``.
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* Set the ``x-ignore-shared`` capability if desired.
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* Issue the ``migrate-incoming`` command.
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* If the VM was running when the outgoing ``migrate`` command was
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issued, then QEMU automatically resumes VM execution.
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Example 1
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^^^^^^^^^
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::
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# qemu-kvm -monitor stdio
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-object memory-backend-file,id=ram0,size=4G,mem-path=/dev/dax0.0,align=2M,share=on -m 4G
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...
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(qemu) info status
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VM status: running
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(qemu) migrate_set_parameter mode cpr-reboot
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(qemu) migrate_set_capability x-ignore-shared on
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(qemu) migrate -d file:vm.state
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(qemu) info status
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VM status: paused (postmigrate)
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(qemu) quit
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### optionally update kernel and reboot
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# systemctl kexec
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kexec_core: Starting new kernel
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...
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|
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# qemu-kvm ... -incoming defer
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(qemu) info status
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VM status: paused (inmigrate)
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(qemu) migrate_set_parameter mode cpr-reboot
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(qemu) migrate_set_capability x-ignore-shared on
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(qemu) migrate_incoming file:vm.state
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(qemu) info status
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VM status: running
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|
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Example 2: VFIO
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^^^^^^^^^^^^^^^
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::
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# qemu-kvm -monitor stdio
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-object memory-backend-file,id=ram0,size=4G,mem-path=/dev/dax0.0,align=2M,share=on -m 4G
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-device vfio-pci, ...
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-chardev socket,id=qga0,path=qga.sock,server=on,wait=off
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-device virtserialport,chardev=qga0,name=org.qemu.guest_agent.0
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||||
...
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(qemu) info status
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VM status: running
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|
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# echo '{"execute":"guest-suspend-ram"}' | ncat --send-only -U qga.sock
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(qemu) info status
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VM status: paused (suspended)
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(qemu) migrate_set_parameter mode cpr-reboot
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(qemu) migrate_set_capability x-ignore-shared on
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(qemu) migrate -d file:vm.state
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(qemu) info status
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VM status: paused (postmigrate)
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(qemu) quit
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|
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### optionally update kernel and reboot
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# systemctl kexec
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kexec_core: Starting new kernel
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...
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|
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# qemu-kvm ... -incoming defer
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(qemu) info status
|
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VM status: paused (inmigrate)
|
||||
(qemu) migrate_set_parameter mode cpr-reboot
|
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(qemu) migrate_set_capability x-ignore-shared on
|
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(qemu) migrate_incoming file:vm.state
|
||||
(qemu) info status
|
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VM status: paused (suspended)
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(qemu) system_wakeup
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||||
(qemu) info status
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VM status: running
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||||
|
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Caveats
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^^^^^^^
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cpr-reboot mode may not be used with postcopy, background-snapshot,
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or COLO.
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@ -11,3 +11,4 @@ Migration has plenty of features to support different use cases.
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vfio
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virtio
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mapped-ram
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CPR
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@ -655,6 +655,7 @@ static inline void mmap_unlock(void) {}
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void tlb_reset_dirty(CPUState *cpu, ram_addr_t start1, ram_addr_t length);
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void tlb_set_dirty(CPUState *cpu, vaddr addr);
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void tlb_reset_dirty_range_all(ram_addr_t start, ram_addr_t length);
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MemoryRegionSection *
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address_space_translate_for_iotlb(CPUState *cpu, int asidx, hwaddr addr,
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@ -25,6 +25,7 @@
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#include "sysemu/tcg.h"
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#include "exec/ramlist.h"
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#include "exec/ramblock.h"
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#include "exec/exec-all.h"
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extern uint64_t total_dirty_pages;
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@ -443,6 +444,14 @@ uint64_t cpu_physical_memory_set_dirty_lebitmap(unsigned long *bitmap,
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}
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#endif /* not _WIN32 */
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static inline void cpu_physical_memory_dirty_bits_cleared(ram_addr_t start,
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ram_addr_t length)
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{
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if (tcg_enabled()) {
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tlb_reset_dirty_range_all(start, length);
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}
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}
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bool cpu_physical_memory_test_and_clear_dirty(ram_addr_t start,
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ram_addr_t length,
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unsigned client);
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@ -504,6 +513,9 @@ uint64_t cpu_physical_memory_sync_dirty_bitmap(RAMBlock *rb,
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idx++;
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}
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}
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if (num_dirty) {
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cpu_physical_memory_dirty_bits_cleared(start, length);
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}
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if (rb->clear_bmap) {
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/*
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|
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@ -68,6 +68,24 @@ struct QIOChannelFile {
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QIOChannelFile *
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qio_channel_file_new_fd(int fd);
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|
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/**
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* qio_channel_file_new_dupfd:
|
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* @fd: the file descriptor
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||||
* @errp: pointer to initialized error object
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*
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* Create a new IO channel object for a file represented by the @fd
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* parameter. Like qio_channel_file_new_fd(), but the @fd is first
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* duplicated with dup().
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*
|
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* The channel will own the duplicated file descriptor and will take
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* responsibility for closing it, the original FD is owned by the
|
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* caller.
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*
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* Returns: the new channel object
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*/
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QIOChannelFile *
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qio_channel_file_new_dupfd(int fd, Error **errp);
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|
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/**
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* qio_channel_file_new_path:
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* @path: the file path
|
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|
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@ -45,6 +45,18 @@ qio_channel_file_new_fd(int fd)
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return ioc;
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}
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|
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QIOChannelFile *
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qio_channel_file_new_dupfd(int fd, Error **errp)
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{
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int newfd = dup(fd);
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|
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if (newfd < 0) {
|
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error_setg_errno(errp, errno, "Could not dup FD %d", fd);
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return NULL;
|
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}
|
||||
|
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return qio_channel_file_new_fd(newfd);
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}
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|
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QIOChannelFile *
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qio_channel_file_new_path(const char *path,
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|
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@ -402,7 +402,10 @@ static int init_blk_migration(QEMUFile *f)
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}
|
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|
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sectors = bdrv_nb_sectors(bs);
|
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if (sectors <= 0) {
|
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if (sectors == 0) {
|
||||
continue;
|
||||
}
|
||||
if (sectors < 0) {
|
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ret = sectors;
|
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bdrv_next_cleanup(&it);
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goto out;
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|
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@ -18,9 +18,11 @@
|
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#include "qapi/error.h"
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#include "channel.h"
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#include "fd.h"
|
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#include "file.h"
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#include "migration.h"
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#include "monitor/monitor.h"
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#include "io/channel-file.h"
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#include "io/channel-socket.h"
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#include "io/channel-util.h"
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#include "options.h"
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#include "trace.h"
|
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@ -47,8 +49,7 @@ void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **
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||||
{
|
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QIOChannel *ioc;
|
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int fd = monitor_get_fd(monitor_cur(), fdname, errp);
|
||||
|
||||
outgoing_args.fd = -1;
|
||||
int newfd;
|
||||
|
||||
if (fd == -1) {
|
||||
return;
|
||||
@ -61,7 +62,17 @@ void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **
|
||||
return;
|
||||
}
|
||||
|
||||
outgoing_args.fd = fd;
|
||||
/*
|
||||
* This is dup()ed just to avoid referencing an fd that might
|
||||
* be already closed by the iochannel.
|
||||
*/
|
||||
newfd = dup(fd);
|
||||
if (newfd == -1) {
|
||||
error_setg_errno(errp, errno, "Could not dup FD %d", fd);
|
||||
object_unref(ioc);
|
||||
return;
|
||||
}
|
||||
outgoing_args.fd = newfd;
|
||||
|
||||
qio_channel_set_name(ioc, "migration-fd-outgoing");
|
||||
migration_channel_connect(s, ioc, NULL, NULL);
|
||||
@ -93,28 +104,20 @@ void fd_start_incoming_migration(const char *fdname, Error **errp)
|
||||
return;
|
||||
}
|
||||
|
||||
qio_channel_set_name(ioc, "migration-fd-incoming");
|
||||
qio_channel_add_watch_full(ioc, G_IO_IN,
|
||||
fd_accept_incoming_migration,
|
||||
NULL, NULL,
|
||||
g_main_context_get_thread_default());
|
||||
|
||||
if (migrate_multifd()) {
|
||||
int channels = migrate_multifd_channels();
|
||||
|
||||
while (channels--) {
|
||||
ioc = QIO_CHANNEL(qio_channel_file_new_fd(dup(fd)));
|
||||
|
||||
if (QIO_CHANNEL_FILE(ioc)->fd == -1) {
|
||||
error_setg(errp, "Failed to duplicate fd %d", fd);
|
||||
return;
|
||||
}
|
||||
|
||||
qio_channel_set_name(ioc, "migration-fd-incoming");
|
||||
qio_channel_add_watch_full(ioc, G_IO_IN,
|
||||
fd_accept_incoming_migration,
|
||||
NULL, NULL,
|
||||
g_main_context_get_thread_default());
|
||||
if (fd_is_socket(fd)) {
|
||||
error_setg(errp,
|
||||
"Multifd migration to a socket FD is not supported");
|
||||
object_unref(ioc);
|
||||
return;
|
||||
}
|
||||
|
||||
file_create_incoming_channels(ioc, errp);
|
||||
} else {
|
||||
qio_channel_set_name(ioc, "migration-fd-incoming");
|
||||
qio_channel_add_watch_full(ioc, G_IO_IN,
|
||||
fd_accept_incoming_migration,
|
||||
NULL, NULL,
|
||||
g_main_context_get_thread_default());
|
||||
}
|
||||
}
|
||||
|
||||
@ -15,6 +15,7 @@
|
||||
#include "file.h"
|
||||
#include "migration.h"
|
||||
#include "io/channel-file.h"
|
||||
#include "io/channel-socket.h"
|
||||
#include "io/channel-util.h"
|
||||
#include "options.h"
|
||||
#include "trace.h"
|
||||
@ -58,12 +59,19 @@ bool file_send_channel_create(gpointer opaque, Error **errp)
|
||||
int fd = fd_args_get_fd();
|
||||
|
||||
if (fd && fd != -1) {
|
||||
ioc = qio_channel_file_new_fd(dup(fd));
|
||||
} else {
|
||||
ioc = qio_channel_file_new_path(outgoing_args.fname, flags, 0, errp);
|
||||
if (!ioc) {
|
||||
if (fd_is_socket(fd)) {
|
||||
error_setg(errp,
|
||||
"Multifd migration to a socket FD is not supported");
|
||||
goto out;
|
||||
}
|
||||
|
||||
ioc = qio_channel_file_new_dupfd(fd, errp);
|
||||
} else {
|
||||
ioc = qio_channel_file_new_path(outgoing_args.fname, flags, 0, errp);
|
||||
}
|
||||
|
||||
if (!ioc) {
|
||||
goto out;
|
||||
}
|
||||
|
||||
multifd_channel_connect(opaque, QIO_CHANNEL(ioc));
|
||||
@ -114,13 +122,46 @@ static gboolean file_accept_incoming_migration(QIOChannel *ioc,
|
||||
return G_SOURCE_REMOVE;
|
||||
}
|
||||
|
||||
void file_create_incoming_channels(QIOChannel *ioc, Error **errp)
|
||||
{
|
||||
int i, fd, channels = 1;
|
||||
g_autofree QIOChannel **iocs = NULL;
|
||||
|
||||
if (migrate_multifd()) {
|
||||
channels += migrate_multifd_channels();
|
||||
}
|
||||
|
||||
iocs = g_new0(QIOChannel *, channels);
|
||||
fd = QIO_CHANNEL_FILE(ioc)->fd;
|
||||
iocs[0] = ioc;
|
||||
|
||||
for (i = 1; i < channels; i++) {
|
||||
QIOChannelFile *fioc = qio_channel_file_new_dupfd(fd, errp);
|
||||
|
||||
if (!fioc) {
|
||||
while (i) {
|
||||
object_unref(iocs[--i]);
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
iocs[i] = QIO_CHANNEL(fioc);
|
||||
}
|
||||
|
||||
for (i = 0; i < channels; i++) {
|
||||
qio_channel_set_name(iocs[i], "migration-file-incoming");
|
||||
qio_channel_add_watch_full(iocs[i], G_IO_IN,
|
||||
file_accept_incoming_migration,
|
||||
NULL, NULL,
|
||||
g_main_context_get_thread_default());
|
||||
}
|
||||
}
|
||||
|
||||
void file_start_incoming_migration(FileMigrationArgs *file_args, Error **errp)
|
||||
{
|
||||
g_autofree char *filename = g_strdup(file_args->filename);
|
||||
QIOChannelFile *fioc = NULL;
|
||||
uint64_t offset = file_args->offset;
|
||||
int channels = 1;
|
||||
int i = 0;
|
||||
|
||||
trace_migration_file_incoming(filename);
|
||||
|
||||
@ -131,29 +172,11 @@ void file_start_incoming_migration(FileMigrationArgs *file_args, Error **errp)
|
||||
|
||||
if (offset &&
|
||||
qio_channel_io_seek(QIO_CHANNEL(fioc), offset, SEEK_SET, errp) < 0) {
|
||||
object_unref(OBJECT(fioc));
|
||||
return;
|
||||
}
|
||||
|
||||
if (migrate_multifd()) {
|
||||
channels += migrate_multifd_channels();
|
||||
}
|
||||
|
||||
do {
|
||||
QIOChannel *ioc = QIO_CHANNEL(fioc);
|
||||
|
||||
qio_channel_set_name(ioc, "migration-file-incoming");
|
||||
qio_channel_add_watch_full(ioc, G_IO_IN,
|
||||
file_accept_incoming_migration,
|
||||
NULL, NULL,
|
||||
g_main_context_get_thread_default());
|
||||
|
||||
fioc = qio_channel_file_new_fd(dup(fioc->fd));
|
||||
|
||||
if (!fioc || fioc->fd == -1) {
|
||||
error_setg(errp, "Error creating migration incoming channel");
|
||||
break;
|
||||
}
|
||||
} while (++i < channels);
|
||||
file_create_incoming_channels(QIO_CHANNEL(fioc), errp);
|
||||
}
|
||||
|
||||
int file_write_ramblock_iov(QIOChannel *ioc, const struct iovec *iov,
|
||||
|
||||
@ -20,6 +20,7 @@ void file_start_outgoing_migration(MigrationState *s,
|
||||
int file_parse_offset(char *filespec, uint64_t *offsetp, Error **errp);
|
||||
void file_cleanup_outgoing_migration(void);
|
||||
bool file_send_channel_create(gpointer opaque, Error **errp);
|
||||
void file_create_incoming_channels(QIOChannel *ioc, Error **errp);
|
||||
int file_write_ramblock_iov(QIOChannel *ioc, const struct iovec *iov,
|
||||
int niov, RAMBlock *block, Error **errp);
|
||||
int multifd_file_recv_data(MultiFDRecvParams *p, Error **errp);
|
||||
|
||||
@ -166,9 +166,9 @@ static bool transport_supports_seeking(MigrationAddress *addr)
|
||||
}
|
||||
|
||||
/*
|
||||
* At this point, the user might not yet have passed the file
|
||||
* descriptor to QEMU, so we cannot know for sure whether it
|
||||
* refers to a plain file or a socket. Let it through anyway.
|
||||
* At this point QEMU has not yet fetched the fd passed in by the
|
||||
* user, so we cannot know for sure whether it refers to a plain
|
||||
* file or a socket. Let it through anyway and check at fd.c.
|
||||
*/
|
||||
if (addr->transport == MIGRATION_ADDRESS_TYPE_SOCKET) {
|
||||
return addr->u.socket.type == SOCKET_ADDRESS_TYPE_FD;
|
||||
|
||||
@ -819,7 +819,7 @@ found:
|
||||
return block;
|
||||
}
|
||||
|
||||
static void tlb_reset_dirty_range_all(ram_addr_t start, ram_addr_t length)
|
||||
void tlb_reset_dirty_range_all(ram_addr_t start, ram_addr_t length)
|
||||
{
|
||||
CPUState *cpu;
|
||||
ram_addr_t start1;
|
||||
@ -881,8 +881,8 @@ bool cpu_physical_memory_test_and_clear_dirty(ram_addr_t start,
|
||||
memory_region_clear_dirty_bitmap(ramblock->mr, mr_offset, mr_size);
|
||||
}
|
||||
|
||||
if (dirty && tcg_enabled()) {
|
||||
tlb_reset_dirty_range_all(start, length);
|
||||
if (dirty) {
|
||||
cpu_physical_memory_dirty_bits_cleared(start, length);
|
||||
}
|
||||
|
||||
return dirty;
|
||||
@ -929,9 +929,7 @@ DirtyBitmapSnapshot *cpu_physical_memory_snapshot_and_clear_dirty
|
||||
}
|
||||
}
|
||||
|
||||
if (tcg_enabled()) {
|
||||
tlb_reset_dirty_range_all(start, length);
|
||||
}
|
||||
cpu_physical_memory_dirty_bits_cleared(start, length);
|
||||
|
||||
memory_region_clear_dirty_bitmap(mr, offset, length);
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user