From: Steven Sistare <steven.sistare@oracle.com>
To: qemu-devel@nongnu.org
Cc: "Daniel P. Berrange" <berrange@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
"Alex Bennée" <alex.bennee@linaro.org>,
"Juan Quintela" <quintela@redhat.com>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
"Markus Armbruster" <armbru@redhat.com>,
"Alex Williamson" <alex.williamson@redhat.com>,
"Stefan Hajnoczi" <stefanha@redhat.com>,
"Marc-André Lureau" <marcandre.lureau@redhat.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Philippe Mathieu-Daudé" <philmd@redhat.com>
Subject: Re: [PATCH V1 00/32] Live Update
Date: Tue, 4 Aug 2020 14:18:36 -0400 [thread overview]
Message-ID: <a8011e90-a051-1531-626a-acd008c50eb7@oracle.com> (raw)
In-Reply-To: <1596122076-341293-1-git-send-email-steven.sistare@oracle.com>
Hi folks, any questions or comments on the vfio and pci changes in
patch 30? Or on the means of preserving anonymous memory and re-exec'ing
in patches 14 - 21?
- Steve
On 7/30/2020 11:14 AM, Steve Sistare wrote:
> Improve and extend the qemu functions that save and restore VM state so a
> guest may be suspended and resumed with minimal pause time. qemu may be
> updated to a new version in between.
>
> The first set of patches adds the cprsave and cprload commands to save and
> restore VM state, and allow the host kernel to be updated and rebooted in
> between. The VM must create guest RAM in a persistent shared memory file,
> such as /dev/dax0.0 or persistant /dev/shm PKRAM as proposed in
> https://lore.kernel.org/lkml/1588812129-8596-1-git-send-email-anthony.yznaga@oracle.com/
>
> cprsave stops the VCPUs and saves VM device state in a simple file, and
> thus supports any type of guest image and block device. The caller must
> not modify the VM's block devices between cprsave and cprload.
>
> cprsave and cprload support guests with vfio devices if the caller first
> suspends the guest by issuing guest-suspend-ram to the qemu guest agent.
> The guest drivers suspend methods flush outstanding requests and re-
> initialize the devices, and thus there is no device state to save and
> restore.
>
> 1 savevm: add vmstate handler iterators
> 2 savevm: VM handlers mode mask
> 3 savevm: QMP command for cprsave
> 4 savevm: HMP Command for cprsave
> 5 savevm: QMP command for cprload
> 6 savevm: HMP Command for cprload
> 7 savevm: QMP command for cprinfo
> 8 savevm: HMP command for cprinfo
> 9 savevm: prevent cprsave if memory is volatile
> 10 kvmclock: restore paused KVM clock
> 11 cpu: disable ticks when suspended
> 12 vl: pause option
> 13 gdbstub: gdb support for suspended state
>
> The next patches add a restart method that eliminates the persistent memory
> constraint, and allows qemu to be updated across the restart, but does not
> allow host reboot. Anonymous memory segments used by the guest are
> preserved across a re-exec of qemu, mapped at the same VA, via a proposed
> madvise(MADV_DOEXEC) option in the Linux kernel. See
> https://lore.kernel.org/lkml/1595869887-23307-1-git-send-email-anthony.yznaga@oracle.com/
>
> 14 savevm: VMS_RESTART and cprsave restart
> 15 vl: QEMU_START_FREEZE env var
> 16 oslib: add qemu_clr_cloexec
> 17 util: env var helpers
> 18 osdep: import MADV_DOEXEC
> 19 memory: ram_block_add cosmetic changes
> 20 vl: add helper to request re-exec
> 21 exec, memory: exec(3) to restart
> 22 char: qio_channel_socket_accept reuse fd
> 23 char: save/restore chardev socket fds
> 24 ui: save/restore vnc socket fds
> 25 char: save/restore chardev pty fds
> 26 monitor: save/restore QMP negotiation status
> 27 vhost: reset vhost devices upon cprsave
> 28 char: restore terminal on restart
>
> The next patches extend the restart method to save and restore vfio-pci
> state, eliminating the requirement for a guest agent. The vfio container,
> group, and device descriptors are preserved across the qemu re-exec.
>
> 29 pci: export pci_update_mappings
> 30 vfio-pci: save and restore
> 31 vfio-pci: trace pci config
> 32 vfio-pci: improved tracing
>
> Here is an example of updating qemu from v4.2.0 to v4.2.1 using
> "cprload restart". The software update is performed while the guest is
> running to minimize downtime.
>
> window 1 | window 2
> |
> # qemu-system-x86_64 ... |
> QEMU 4.2.0 monitor - type 'help' ... |
> (qemu) info status |
> VM status: running |
> | # yum update qemu
> (qemu) cprsave /tmp/qemu.sav restart |
> QEMU 4.2.1 monitor - type 'help' ... |
> (qemu) info status |
> VM status: paused (prelaunch) |
> (qemu) cprload /tmp/qemu.sav |
> (qemu) info status |
> VM status: running |
>
>
> Here is an example of updating the host kernel using "cprload reboot"
>
> window 1 | window 2
> |
> # qemu-system-x86_64 ...mem-path=/dev/dax0.0 ...|
> QEMU 4.2.1 monitor - type 'help' ... |
> (qemu) info status |
> VM status: running |
> | # yum update kernel-uek
> (qemu) cprsave /tmp/qemu.sav restart |
> |
> # systemctl kexec |
> kexec_core: Starting new kernel |
> ... |
> |
> # qemu-system-x86_64 ...mem-path=/dev/dax0.0 ...|
> QEMU 4.2.1 monitor - type 'help' ... |
> (qemu) info status |
> VM status: paused (prelaunch) |
> (qemu) cprload /tmp/qemu.sav |
> (qemu) info status |
> VM status: running |
>
>
> Mark Kanda (5):
> char: qio_channel_socket_accept reuse fd
> char: save/restore chardev socket fds
> ui: save/restore vnc socket fds
> monitor: save/restore QMP negotiation status
> vhost: reset vhost devices upon cprsave
>
> Steve Sistare (27):
> savevm: add vmstate handler iterators
> savevm: VM handlers mode mask
> savevm: QMP command for cprsave
> savevm: HMP Command for cprsave
> savevm: QMP command for cprload
> savevm: HMP Command for cprload
> savevm: QMP command for cprinfo
> savevm: HMP command for cprinfo
> savevm: prevent cprsave if memory is volatile
> kvmclock: restore paused KVM clock
> cpu: disable ticks when suspended
> vl: pause option
> gdbstub: gdb support for suspended state
> savevm: VMS_RESTART and cprsave restart
> vl: QEMU_START_FREEZE env var
> oslib: add qemu_clr_cloexec
> util: env var helpers
> osdep: import MADV_DOEXEC
> memory: ram_block_add cosmetic changes
> vl: add helper to request re-exec
> exec, memory: exec(3) to restart
> char: save/restore chardev pty fds
> char: restore terminal on restart
> pci: export pci_update_mappings
> vfio-pci: save and restore
> vfio-pci: trace pci config
> vfio-pci: improved tracing
>
> MAINTAINERS | 7 ++
> accel/kvm/kvm-all.c | 8 +-
> accel/kvm/trace-events | 3 +-
> chardev/char-pty.c | 38 +++++--
> chardev/char-socket.c | 35 ++++++
> chardev/char-stdio.c | 7 ++
> chardev/char.c | 16 +++
> exec.c | 88 +++++++++++++--
> gdbstub.c | 11 +-
> hmp-commands.hx | 46 ++++++++
> hw/i386/kvm/clock.c | 6 +-
> hw/pci/msix.c | 1 +
> hw/pci/pci.c | 17 +--
> hw/pci/trace-events | 5 +-
> hw/vfio/common.c | 115 ++++++++++++++++----
> hw/vfio/pci.c | 179 ++++++++++++++++++++++++++++++-
> hw/vfio/platform.c | 2 +-
> hw/vfio/trace-events | 11 +-
> hw/virtio/vhost.c | 12 +++
> include/chardev/char.h | 8 ++
> include/exec/memory.h | 4 +
> include/hw/pci/pci.h | 2 +
> include/hw/vfio/vfio-common.h | 4 +-
> include/io/channel-socket.h | 3 +-
> include/migration/register.h | 3 +
> include/migration/vmstate.h | 11 ++
> include/monitor/hmp.h | 3 +
> include/qemu/cutils.h | 1 +
> include/qemu/env.h | 31 ++++++
> include/qemu/osdep.h | 8 ++
> include/sysemu/sysemu.h | 10 ++
> io/channel-socket.c | 12 ++-
> io/net-listener.c | 4 +-
> migration/block.c | 1 +
> migration/migration.c | 4 +-
> migration/ram.c | 1 +
> migration/savevm.c | 237 ++++++++++++++++++++++++++++++++++++-----
> migration/savevm.h | 4 +-
> monitor/hmp-cmds.c | 28 +++++
> monitor/qmp-cmds.c | 16 +++
> monitor/qmp.c | 42 ++++++++
> qapi/migration.json | 35 ++++++
> qapi/pragma.json | 1 +
> qemu-options.hx | 9 ++
> scsi/qemu-pr-helper.c | 2 +-
> softmmu/vl.c | 65 ++++++++++-
> tests/qtest/tpm-emu.c | 2 +-
> tests/test-char.c | 2 +-
> tests/test-io-channel-socket.c | 4 +-
> trace-events | 2 +
> ui/vnc.c | 153 +++++++++++++++++++++-----
> util/Makefile.objs | 2 +-
> util/env.c | 132 +++++++++++++++++++++++
> util/oslib-posix.c | 9 ++
> util/oslib-win32.c | 4 +
> 55 files changed, 1331 insertions(+), 135 deletions(-)
> create mode 100644 include/qemu/env.h
> create mode 100644 util/env.c
>
prev parent reply other threads:[~2020-08-04 18:19 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-30 15:14 [PATCH V1 00/32] Live Update Steve Sistare
2020-07-30 15:14 ` [PATCH V1 01/32] savevm: add vmstate handler iterators Steve Sistare
2020-09-11 16:24 ` Dr. David Alan Gilbert
2020-09-24 21:43 ` Steven Sistare
2020-09-25 9:07 ` Dr. David Alan Gilbert
2020-07-30 15:14 ` [PATCH V1 02/32] savevm: VM handlers mode mask Steve Sistare
2020-07-30 15:14 ` [PATCH V1 03/32] savevm: QMP command for cprsave Steve Sistare
2020-07-30 16:12 ` Eric Blake
2020-07-30 17:52 ` Steven Sistare
2020-09-11 16:43 ` Dr. David Alan Gilbert
2020-09-25 18:43 ` Steven Sistare
2020-09-25 22:22 ` Steven Sistare
2020-07-30 15:14 ` [PATCH V1 04/32] savevm: HMP Command " Steve Sistare
2020-09-11 16:57 ` Dr. David Alan Gilbert
2020-09-24 21:44 ` Steven Sistare
2020-09-25 9:26 ` Dr. David Alan Gilbert
2020-07-30 15:14 ` [PATCH V1 05/32] savevm: QMP command for cprload Steve Sistare
2020-07-30 16:14 ` Eric Blake
2020-07-30 18:00 ` Steven Sistare
2020-09-11 17:18 ` Dr. David Alan Gilbert
2020-09-24 21:49 ` Steven Sistare
2020-07-30 15:14 ` [PATCH V1 06/32] savevm: HMP Command " Steve Sistare
2020-07-30 15:14 ` [PATCH V1 07/32] savevm: QMP command for cprinfo Steve Sistare
2020-07-30 16:17 ` Eric Blake
2020-07-30 18:02 ` Steven Sistare
2020-07-30 15:14 ` [PATCH V1 08/32] savevm: HMP " Steve Sistare
2020-09-11 17:27 ` Dr. David Alan Gilbert
2020-09-24 21:50 ` Steven Sistare
2020-07-30 15:14 ` [PATCH V1 09/32] savevm: prevent cprsave if memory is volatile Steve Sistare
2020-09-11 17:35 ` Dr. David Alan Gilbert
2020-09-24 21:51 ` Steven Sistare
2020-07-30 15:14 ` [PATCH V1 10/32] kvmclock: restore paused KVM clock Steve Sistare
2020-09-11 17:50 ` Dr. David Alan Gilbert
2020-09-25 18:07 ` Steven Sistare
2020-07-30 15:14 ` [PATCH V1 11/32] cpu: disable ticks when suspended Steve Sistare
2020-09-11 17:53 ` Dr. David Alan Gilbert
2020-09-24 20:42 ` Steven Sistare
2020-09-25 9:03 ` Dr. David Alan Gilbert
2020-07-30 15:14 ` [PATCH V1 12/32] vl: pause option Steve Sistare
2020-07-30 16:20 ` Eric Blake
2020-07-30 18:11 ` Steven Sistare
2020-07-31 10:07 ` Daniel P. Berrangé
2020-07-31 15:18 ` Steven Sistare
2020-07-30 17:03 ` Alex Bennée
2020-07-30 18:14 ` Steven Sistare
2020-07-31 9:44 ` Alex Bennée
2020-09-11 17:59 ` Dr. David Alan Gilbert
2020-09-24 21:51 ` Steven Sistare
2020-07-30 15:14 ` [PATCH V1 13/32] gdbstub: gdb support for suspended state Steve Sistare
2020-09-11 18:41 ` Dr. David Alan Gilbert
2020-09-24 21:51 ` Steven Sistare
2020-07-30 15:14 ` [PATCH V1 14/32] savevm: VMS_RESTART and cprsave restart Steve Sistare
2020-07-30 16:22 ` Eric Blake
2020-07-30 18:14 ` Steven Sistare
2020-09-11 18:44 ` Dr. David Alan Gilbert
2020-09-24 21:44 ` Steven Sistare
2020-07-30 15:14 ` [PATCH V1 15/32] vl: QEMU_START_FREEZE env var Steve Sistare
2020-09-11 18:49 ` Dr. David Alan Gilbert
2020-09-24 21:47 ` Steven Sistare
2020-09-25 15:52 ` Dr. David Alan Gilbert
2020-07-30 15:14 ` [PATCH V1 16/32] oslib: add qemu_clr_cloexec Steve Sistare
2020-09-11 18:52 ` Dr. David Alan Gilbert
2020-07-30 15:14 ` [PATCH V1 17/32] util: env var helpers Steve Sistare
2020-09-11 19:00 ` Dr. David Alan Gilbert
2020-09-24 21:52 ` Steven Sistare
2020-07-30 15:14 ` [PATCH V1 18/32] osdep: import MADV_DOEXEC Steve Sistare
2020-08-17 18:30 ` Steven Sistare
2020-08-17 20:48 ` Alex Williamson
2020-08-17 21:20 ` Steven Sistare
2020-08-17 21:44 ` Alex Williamson
2020-08-18 2:42 ` Alex Williamson
2020-08-19 21:52 ` Steven Sistare
2020-08-24 22:30 ` Alex Williamson
2020-10-08 16:32 ` Steven Sistare
2020-10-15 20:36 ` Alex Williamson
2020-10-19 16:33 ` Steven Sistare
2020-10-26 18:28 ` Steven Sistare
2020-07-30 15:14 ` [PATCH V1 19/32] memory: ram_block_add cosmetic changes Steve Sistare
2020-07-30 15:14 ` [PATCH V1 20/32] vl: add helper to request re-exec Steve Sistare
2020-07-30 15:14 ` [PATCH V1 21/32] exec, memory: exec(3) to restart Steve Sistare
2020-07-30 15:14 ` [PATCH V1 22/32] char: qio_channel_socket_accept reuse fd Steve Sistare
2020-09-15 17:33 ` Dr. David Alan Gilbert
2020-09-15 17:53 ` Daniel P. Berrangé
2020-09-24 21:54 ` Steven Sistare
2020-07-30 15:14 ` [PATCH V1 23/32] char: save/restore chardev socket fds Steve Sistare
2020-07-30 15:14 ` [PATCH V1 24/32] ui: save/restore vnc " Steve Sistare
2020-07-31 9:06 ` Daniel P. Berrangé
2020-07-31 16:51 ` Steven Sistare
2020-07-30 15:14 ` [PATCH V1 25/32] char: save/restore chardev pty fds Steve Sistare
2020-07-30 15:14 ` [PATCH V1 26/32] monitor: save/restore QMP negotiation status Steve Sistare
2020-07-30 15:14 ` [PATCH V1 27/32] vhost: reset vhost devices upon cprsave Steve Sistare
2020-07-30 15:14 ` [PATCH V1 28/32] char: restore terminal on restart Steve Sistare
2020-07-30 15:14 ` [PATCH V1 29/32] pci: export pci_update_mappings Steve Sistare
2020-07-30 15:14 ` [PATCH V1 30/32] vfio-pci: save and restore Steve Sistare
2020-08-06 10:22 ` Jason Zeng
2020-08-07 20:38 ` Steven Sistare
2020-08-10 3:50 ` Jason Zeng
2020-08-19 21:15 ` Steven Sistare
2020-08-20 10:33 ` Jason Zeng
2020-10-07 21:25 ` Steven Sistare
2020-07-30 15:14 ` [PATCH V1 31/32] vfio-pci: trace pci config Steve Sistare
2020-07-30 15:14 ` [PATCH V1 32/32] vfio-pci: improved tracing Steve Sistare
2020-09-15 18:49 ` Dr. David Alan Gilbert
2020-09-24 21:52 ` Steven Sistare
2020-07-30 16:52 ` [PATCH V1 00/32] Live Update Daniel P. Berrangé
2020-07-30 18:48 ` Steven Sistare
2020-07-31 8:53 ` Daniel P. Berrangé
2020-07-31 15:27 ` Steven Sistare
2020-07-31 15:52 ` Daniel P. Berrangé
2020-07-31 17:20 ` Steven Sistare
2020-08-11 19:08 ` Dr. David Alan Gilbert
2020-07-30 17:15 ` Paolo Bonzini
2020-07-30 19:09 ` Steven Sistare
2020-07-30 21:39 ` Paolo Bonzini
2020-07-31 19:22 ` Steven Sistare
2020-07-30 17:49 ` Dr. David Alan Gilbert
2020-07-30 19:31 ` Steven Sistare
2020-08-04 18:18 ` Steven Sistare [this message]
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