qemu-e2k/include
Claudio Imbrenda c3a073c610 s390x/pv: Add support for asynchronous teardown for reboot
This patch adds support for the asynchronous teardown for reboot for
protected VMs.

When attempting to tear down a protected VM, try to use the new
asynchronous interface first. If that fails, fall back to the classic
synchronous one.

The asynchronous interface involves invoking the new
KVM_PV_ASYNC_DISABLE_PREPARE command for the KVM_S390_PV_COMMAND ioctl.

This will prepare the current protected VM for asynchronous teardown.
Once the protected VM is prepared for teardown, execution can continue
immediately.

Once the protected VM has been prepared, a new thread is started to
actually perform the teardown. The new thread uses the new
KVM_PV_ASYNC_DISABLE command for the KVM_S390_PV_COMMAND ioctl. The
previously prepared protected VM is torn down in the new thread.

Once KVM_PV_ASYNC_DISABLE is invoked, it is possible to use
KVM_PV_ASYNC_DISABLE_PREPARE again. If a protected VM has already been
prepared and its cleanup has not started, it will not be possible to
prepare a new VM. In that case the classic synchronous teardown has to
be performed.

The synchronous teardown will now also clean up any prepared VMs whose
asynchronous teardown has not been initiated yet.

This considerably speeds up the reboot of a protected VM; for large VMs
especially, it could take a long time to perform a reboot with the
traditional synchronous teardown, while with this patch it is almost
immediate.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20230214163035.44104-3-imbrenda@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
2023-02-27 09:15:39 +01:00
..
authz
block block: Mark bdrv_co_refresh_total_sectors() and callers GRAPH_RDLOCK 2023-02-23 19:49:33 +01:00
chardev
crypto crypto: TLS: introduce check_pending 2023-02-15 11:01:03 -05:00
disas remove unnecessary extern "C" blocks 2023-02-10 14:12:06 +01:00
exec bsd-user/mmap: use TSA_NO_TSA to suppress clang TSA warnings in FreeBSD 2023-02-17 11:22:19 +01:00
fpu
hw s390x/pv: Add support for asynchronous teardown for reboot 2023-02-27 09:15:39 +01:00
io io: Add support for MSG_PEEK for socket channel 2023-02-06 19:22:56 +01:00
libdecnumber
migration migration: Rename res_{postcopy,precopy}_only 2023-02-15 20:04:30 +01:00
monitor monitor: Move remaining HMP commands from misc.c to hmp-cmds.c 2023-02-04 07:56:54 +01:00
net net: Move the code to collect available NIC models to a separate function 2023-02-17 13:31:33 +08:00
qapi rocker: Tweak stubbed out monitor commands' error messages 2023-02-23 14:10:17 +01:00
qemu hbitmap: fix hbitmap_status() return value for first dirty bit case 2023-02-17 14:34:24 +01:00
qom
scsi coroutine: Clean up superfluous inclusion of qemu/coroutine.h 2023-01-19 10:18:28 +01:00
semihosting
standard-headers linux-headers: Update to v6.2-rc8 2023-02-16 12:13:46 -07:00
sysemu Block layer patches 2023-02-24 15:09:39 +00:00
tcg tcg: Split out tcg_gen_nonatomic_cmpxchg_i{32,64} 2023-02-04 06:19:42 -10:00
ui Do not include "qemu/error-report.h" in headers that do not need it 2023-02-14 09:11:27 +01:00
user include: Include headers where needed 2023-01-08 01:54:22 -05:00
elf.h
glib-compat.h
qemu-io.h
qemu-main.h