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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [Qemu-devel] [PATCH v2] event: Add source information to SHUTDOWN
On Thu, Apr 20, 2017 at 01:59:29PM +0200, Markus Armbruster wrote:
> Eric Blake <eblake@xxxxxxxxxx> writes:
>
> > Libvirt would like to be able to distinguish between a SHUTDOWN
> > event triggered solely by guest request and one triggered by a
> > SIGTERM or other action on the host. qemu_kill_report() is
> > already able to tell whether a shutdown was triggered by a host
> > signal (but NOT by a host UI event, such as clicking the X on
> > the window), but that information was then lost after being
> > printed to stderr.
> >
> > Enhance the shutdown request path to take a parameter of which
> > way it is being triggered, and update ALL callers. It would have
> > been less churn to keep the common case with no arguments as
> > meaning guest-triggered, and only modified the host-triggered
> > code paths, via a wrapper function, but then we'd still have to
> > audit that I didn't miss any host-triggered spots; changing the
> > signature forces us to double-check that I correctly categorized
> > all callers.
> >
> > Here is output from 'virsh qemu-monitor-event --loop' with the
> > patch installed:
> >
> > event SHUTDOWN at 1492639680.731251 for domain fedora_13: {"guest":true}
> > event STOP at 1492639680.732116 for domain fedora_13: <null>
> > event SHUTDOWN at 1492639680.732830 for domain fedora_13: {"guest":false}
> >
> > Note that libvirt runs qemu with -no-quit: the first SHUTDOWN event
> > was triggered by an action I took directly in the guest (shutdown -h),
> > at which point qemu stops the vcpus and waits for libvirt to do any
> > final cleanups; the second SHUTDOWN event is the result of libvirt
> > sending SIGTERM now that it has completed cleanup.
> >
> > See also https://bugzilla.redhat.com/1384007
> >
> > Signed-off-by: Eric Blake <eblake@xxxxxxxxxx>
> >
> > ---
> >
> > I did not wire up the RESET event to report guest-triggered, although
> > I had to plumb that through all the guests since qemu has options that
> > allow remapping reset to shutdown. It's easy to add that if we want
> > it in v3.
> >
> > The replay driver needs a followup patch if we want to be able to
> > faithfully replay the difference between a host- and guest-initiated
> > shutdown (for now, the replayed event is always attributed to host).
> >
> >
> > v2: retitle (was "event: Add signal information to SHUTDOWN"),
> > completely rework to post bool based on whether it is guest-initiated
> > v1: initial submission, exposing just Unix signals from host
> > ---
> > qapi/event.json | 8 ++++++--
> > include/sysemu/sysemu.h | 4 ++--
> > vl.c | 19 +++++++++++--------
> > hw/acpi/core.c | 4 ++--
> > hw/arm/highbank.c | 4 ++--
> > hw/arm/integratorcp.c | 2 +-
> > hw/arm/musicpal.c | 2 +-
> > hw/arm/omap1.c | 6 +++---
> > hw/arm/omap2.c | 2 +-
> > hw/arm/spitz.c | 2 +-
> > hw/arm/stellaris.c | 2 +-
> > hw/arm/tosa.c | 2 +-
> > hw/i386/pc.c | 2 +-
> > hw/input/pckbd.c | 4 ++--
> > hw/ipmi/ipmi.c | 4 ++--
> > hw/isa/lpc_ich9.c | 2 +-
> > hw/mips/boston.c | 2 +-
> > hw/mips/mips_malta.c | 2 +-
> > hw/mips/mips_r4k.c | 4 ++--
> > hw/misc/arm_sysctl.c | 8 ++++----
> > hw/misc/cbus.c | 2 +-
> > hw/misc/macio/cuda.c | 4 ++--
> > hw/misc/slavio_misc.c | 4 ++--
> > hw/misc/zynq_slcr.c | 2 +-
> > hw/pci-host/apb.c | 4 ++--
> > hw/pci-host/bonito.c | 2 +-
> > hw/pci-host/piix.c | 2 +-
> > hw/ppc/e500.c | 2 +-
> > hw/ppc/mpc8544_guts.c | 2 +-
> > hw/ppc/ppc.c | 2 +-
> > hw/ppc/ppc405_uc.c | 2 +-
> > hw/ppc/spapr_hcall.c | 2 +-
> > hw/ppc/spapr_rtas.c | 4 ++--
> > hw/s390x/ipl.c | 2 +-
> > hw/sh4/r2d.c | 2 +-
> > hw/timer/etraxfs_timer.c | 2 +-
> > hw/timer/m48t59.c | 4 ++--
> > hw/timer/milkymist-sysctl.c | 4 ++--
> > hw/timer/pxa2xx_timer.c | 2 +-
> > hw/watchdog/watchdog.c | 2 +-
> > hw/xenpv/xen_domainbuild.c | 2 +-
> > hw/xtensa/xtfpga.c | 2 +-
> > kvm-all.c | 6 +++---
> > os-win32.c | 2 +-
> > qmp.c | 4 ++--
> > replay/replay.c | 5 ++++-
> > target/alpha/sys_helper.c | 4 ++--
> > target/arm/psci.c | 4 ++--
> > target/i386/excp_helper.c | 2 +-
> > target/i386/hax-all.c | 6 +++---
> > target/i386/helper.c | 2 +-
> > target/i386/kvm.c | 2 +-
> > target/s390x/helper.c | 2 +-
> > target/s390x/kvm.c | 4 ++--
> > target/s390x/misc_helper.c | 4 ++--
> > target/sparc/int32_helper.c | 2 +-
> > ui/sdl.c | 2 +-
> > ui/sdl2.c | 4 ++--
> > xen-hvm.c | 2 +-
> > trace-events | 2 +-
> > ui/cocoa.m | 2 +-
> > 61 files changed, 106 insertions(+), 96 deletions(-)
> >
> > diff --git a/qapi/event.json b/qapi/event.json
> > index e80f3f4..c230265 100644
> > --- a/qapi/event.json
> > +++ b/qapi/event.json
> > @@ -10,6 +10,10 @@
> > # Emitted when the virtual machine has shut down, indicating that qemu is
> > # about to exit.
> > #
> > +# @guest: If true, the shutdown was triggered by a guest request (such as
> > +# executing a halt instruction) rather than a host request (such as sending
> > +# qemu a SIGINT). (since 2.10)
> > +#
>
> "executing a halt instruction" suggests "halt" is a machine instruction.
> I think you mean /usr/sbin/halt. Suggest something like "executing a
> halt command".
Well technically /usr/sbin/halt just terminates all processes / kernel and
halts CPUs, but the virtual machine is still active (and a 'reset' in the
monitor can start it again. /usr/sbin/poweroff is what actually does the
ACPI poweroff to trigger QEMU to exit[1]
Regards,
Daniel
[1] assuming ACPI poweroff is exposed to guest and supported by the guest
kernel.
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