On Tue, 10 Jun 2014 09:39:51 -0400
Luiz Capitulino <lcapitul...@redhat.com> wrote:
> On Wed, 4 Jun 2014 18:08:47 +1000
> Alexey Kardashevskiy <a...@ozlabs.ru> wrote:
>
> > This introduces an NMI (non maskable interrupt) callback per CPU class
> > which QMP's "nmi" command may use to issue NMI on a CPU.
> >
> > This adds support for it in qmp_inject_nmi(). Since no architecture
> > supports it at the moment, there is no change in behaviour.
> >
> > This changes inject-nmi command description for HMP and QMP.
> >
> > Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru>
> > ---
> > Changes:
> > v3:
> > * actual nmi() enablement moved from last patch to first patch
> > * changed description for QMP command too
> > ---
> > cpus.c | 11 ++++++++++-
> > hmp-commands.hx | 6 ++----
> > include/qom/cpu.h | 1 +
> > qapi-schema.json | 4 +---
> > qmp-commands.hx | 3 +--
> > 5 files changed, 15 insertions(+), 10 deletions(-)
> >
> > diff --git a/cpus.c b/cpus.c
> > index dd7ac13..a000bd8 100644
> > --- a/cpus.c
> > +++ b/cpus.c
> > @@ -1495,6 +1495,15 @@ void qmp_inject_nmi(Error **errp)
> > }
> > }
> > #else
> > - error_set(errp, QERR_UNSUPPORTED);
> > + CPUState *cs = qemu_get_cpu(monitor_get_cpu_index());
> > + CPUClass *cc = CPU_GET_CLASS(cs);
> > + int ret = -1;
> > +
> > + if (cs && cc->nmi) {
> > + ret = cc->nmi(cs);
> > + }
> > + if (ret) {
> > + error_set(errp, QERR_UNSUPPORTED);
> > + }
> > #endif
> > }
> > diff --git a/hmp-commands.hx b/hmp-commands.hx
> > index 2e462c0..e97b5ec 100644
> > --- a/hmp-commands.hx
> > +++ b/hmp-commands.hx
> > @@ -830,19 +830,17 @@ The values that can be specified here depend on the
> > machine type, but are
> > the same that can be specified in the @code{-boot} command line option.
> > ETEXI
> >
> > -#if defined(TARGET_I386) || defined(TARGET_S390X)
> > {
> > .name = "nmi",
> > .args_type = "",
> > .params = "",
> > - .help = "inject an NMI on all guest's CPUs",
> > + .help = "inject an NMI on the given guest's CPU",
> > .mhandler.cmd = hmp_inject_nmi,
> > },
> > -#endif
> > STEXI
> > @item nmi @var{cpu}
> > @findex nmi
> > -Inject an NMI (x86) or RESTART (s390x) on the given CPU.
> > +Inject an NMI on the given CPU.
> >
> > ETEXI
> >
> > diff --git a/include/qom/cpu.h b/include/qom/cpu.h
> > index df977c8..b34f23b 100644
> > --- a/include/qom/cpu.h
> > +++ b/include/qom/cpu.h
> > @@ -108,6 +108,7 @@ typedef struct CPUClass {
> > void (*parse_features)(CPUState *cpu, char *str, Error **errp);
> >
> > void (*reset)(CPUState *cpu);
> > + int (*nmi)(CPUState *cs);
> > int reset_dump_flags;
> > bool (*has_work)(CPUState *cpu);
> > void (*do_interrupt)(CPUState *cpu);
> > diff --git a/qapi-schema.json b/qapi-schema.json
> > index 7bc33ea..dcf6642 100644
> > --- a/qapi-schema.json
> > +++ b/qapi-schema.json
> > @@ -1748,13 +1748,11 @@
> > ##
> > # @inject-nmi:
> > #
> > -# Injects an Non-Maskable Interrupt into all guest's VCPUs.
> > +# Injects an Non-Maskable Interrupt into the given guest's VCPU.
>
> QMP doesn't have the concept of "current monitored CPU" you talk in the
> intro email. In QMP you have to specify the CPU. You have to choices:
>
> - Add a new command that takes a CPU parameter (seems the best to me, as
> people were asking for a different command anyways)
>
> - Add an optional parameter to inject-nmi. When the CPU parameter is
> not specified, the command sends the NMI to all CPUs
The s390 restart interrupt is a per-vcpu interrupt, which we really
don't want to inject on _all_ vcpus. OTOH, we want to inject that
interrupt on any vcpu - we don't care which one it is. So I'd really
like an "inject nmi on default cpu" option.
>
> Eric, any thoughts?
>
> > #
> > # Returns: If successful, nothing
> > #
> > # Since: 0.14.0
> > -#
> > -# Notes: Only x86 Virtual Machines support this command.
> > ##
> > { 'command': 'inject-nmi' }
> >
> > diff --git a/qmp-commands.hx b/qmp-commands.hx
> > index d8aa4ed..553375b 100644
> > --- a/qmp-commands.hx
> > +++ b/qmp-commands.hx
> > @@ -477,7 +477,7 @@ SQMP
> > inject-nmi
> > ----------
> >
> > -Inject an NMI on guest's CPUs.
> > +Inject an NMI on the given guest's CPU.
> >
> > Arguments: None.
> >
> > @@ -487,7 +487,6 @@ Example:
> > <- { "return": {} }
> >
> > Note: inject-nmi fails when the guest doesn't support injecting.
> > - Currently, only x86 (NMI) and s390x (RESTART) guests do.
> >
> > EQMP
> >
>
