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Re: [Qemu-ppc] [PATCH RFC 4/4] PPC: KVM: Expose possible VSMT modes via
From: |
Sam Bobroff |
Subject: |
Re: [Qemu-ppc] [PATCH RFC 4/4] PPC: KVM: Expose possible VSMT modes via QMP and HMP |
Date: |
Fri, 21 Jul 2017 14:28:42 +1000 |
User-agent: |
NeoMutt/20170113 (1.7.2) |
On Tue, Jul 18, 2017 at 02:51:13PM +1000, David Gibson wrote:
> On Tue, Jun 27, 2017 at 10:23:02AM +1000, Sam Bobroff wrote:
> > Use a new PPC KVM capability, KVM_PPC_CAP_SMT_POSSIBLE, to expose the
> > valid VSMT modes to users via a new info subcommand ("info vsmt") and
> > QMP clients.
> >
> > Signed-off-by: Sam Bobroff <address@hidden>
> > ---
> > accel/kvm/kvm-all.c | 2 ++
> > hmp-commands-info.hx | 14 ++++++++++++++
> > hmp.c | 16 ++++++++++++++++
> > hmp.h | 1 +
> > hw/ppc/spapr.c | 1 +
> > include/sysemu/kvm.h | 1 +
> > linux-headers/linux/kvm.h | 1 +
> > qapi-schema.json | 28 ++++++++++++++++++++++++++++
> > qmp.c | 20 ++++++++++++++++++++
> > 9 files changed, 84 insertions(+)
> >
> > diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
> > index 75feffa504..fc44d3ae28 100644
> > --- a/accel/kvm/kvm-all.c
> > +++ b/accel/kvm/kvm-all.c
> > @@ -123,6 +123,7 @@ bool kvm_direct_msi_allowed;
> > bool kvm_ioeventfd_any_length_allowed;
> > bool kvm_msi_use_devid;
> > static bool kvm_immediate_exit;
>
> A commit indicating that this is a bitmask of allowed modes might be
> useful, to make it clear why this isn't a bool like most of the cap
> values.
Good idea, will do.
> > +uint64_t kvmppc_smt_possible;
> >
> > static const KVMCapabilityInfo kvm_required_capabilites[] = {
> > KVM_CAP_INFO(USER_MEMORY),
> > @@ -1721,6 +1722,7 @@ static int kvm_init(MachineState *ms)
> > #ifdef KVM_CAP_IRQ_ROUTING
> > kvm_direct_msi_allowed = (kvm_check_extension(s, KVM_CAP_SIGNAL_MSI) >
> > 0);
> > #endif
> > + kvmppc_smt_possible = kvm_check_extension(s, KVM_CAP_PPC_SMT_POSSIBLE);
> >
> > s->intx_set_mask = kvm_check_extension(s, KVM_CAP_PCI_2_3);
> >
> > diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
> > index ae169011b1..eb0ca52395 100644
> > --- a/hmp-commands-info.hx
> > +++ b/hmp-commands-info.hx
> > @@ -304,6 +304,20 @@ Show KVM information.
> > ETEXI
> >
> > {
> > + .name = "vsmt",
> > + .args_type = "",
> > + .params = "",
> > + .help = "show VSMT information",
> > + .cmd = hmp_info_vsmt,
> > + },
> > +
> > +STEXI
> > address@hidden info vsmt
> > address@hidden vsmt
> > +Show VSMT information.
> > +ETEXI
> > +
> > + {
> > .name = "numa",
> > .args_type = "",
> > .params = "",
> > diff --git a/hmp.c b/hmp.c
> > index 8c72c58b20..207668c112 100644
> > --- a/hmp.c
> > +++ b/hmp.c
> > @@ -95,6 +95,22 @@ void hmp_info_kvm(Monitor *mon, const QDict *qdict)
> > qapi_free_KvmInfo(info);
> > }
> >
> > +void hmp_info_vsmt(Monitor *mon, const QDict *qdict)
> > +{
> > + VsmtInfo *info;
> > + intList *entry;
> > +
> > + info = qmp_query_vsmt(NULL);
> > + monitor_printf(mon, "Host KVM supports these VSMT modes:");
> > + entry = info->possible;
> > + while (entry) {
> > + monitor_printf(mon, " %ld", entry->value);
> > + entry = entry->next;
> > + }
> > + qapi_free_VsmtInfo(info);
> > + monitor_printf(mon, "\n");
> > +}
> > +
>
> Hrm. HMP and QMP commands just for looking at this seems like
> overkill.
I added them because I thought tools (e.g. libvirt) would want a way to
determine the values supported by the host, since it affects migration.
Is there a better way to do it? (Should I add it to an existing info
command somehow?) Or is it not necessary?
> > void hmp_info_status(Monitor *mon, const QDict *qdict)
> > {
> > StatusInfo *info;
> > diff --git a/hmp.h b/hmp.h
> > index d8b94ce9dc..dfda944231 100644
> > --- a/hmp.h
> > +++ b/hmp.h
> > @@ -22,6 +22,7 @@
> > void hmp_info_name(Monitor *mon, const QDict *qdict);
> > void hmp_info_version(Monitor *mon, const QDict *qdict);
> > void hmp_info_kvm(Monitor *mon, const QDict *qdict);
> > +void hmp_info_vsmt(Monitor *mon, const QDict *qdict);
> > void hmp_info_status(Monitor *mon, const QDict *qdict);
> > void hmp_info_uuid(Monitor *mon, const QDict *qdict);
> > void hmp_info_chardev(Monitor *mon, const QDict *qdict);
> > diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> > index c9ec1e87a1..d2536e2943 100644
> > --- a/hw/ppc/spapr.c
> > +++ b/hw/ppc/spapr.c
> > @@ -2086,6 +2086,7 @@ static void ppc_set_vsmt_mode(sPAPRMachineState
> > *spapr)
> > /* else TCG: nothing to do currently */
> > return;
> > error:
> > + error_report("Note: \"info vsmt\" shows supported VSMT modes (if
> > any).");
> > exit(1);
> >
> > }
> > diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
> > index 1e91613ca9..dcde6cdd2d 100644
> > --- a/include/sysemu/kvm.h
> > +++ b/include/sysemu/kvm.h
> > @@ -54,6 +54,7 @@ extern bool kvm_readonly_mem_allowed;
> > extern bool kvm_direct_msi_allowed;
> > extern bool kvm_ioeventfd_any_length_allowed;
> > extern bool kvm_msi_use_devid;
> > +extern uint64_t kvmppc_smt_possible;
> >
> > #if defined CONFIG_KVM || !defined NEED_CPU_H
> > #define kvm_enabled() (kvm_allowed)
> > diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h
> > index d2892da172..be708cbf77 100644
> > --- a/linux-headers/linux/kvm.h
> > +++ b/linux-headers/linux/kvm.h
> > @@ -895,6 +895,7 @@ struct kvm_ppc_resize_hpt {
> > #define KVM_CAP_SPAPR_TCE_VFIO 142
> > #define KVM_CAP_X86_GUEST_MWAIT 143
> > #define KVM_CAP_ARM_USER_IRQ 144
> > +#define KVM_CAP_PPC_SMT_POSSIBLE 146 /* NEEDS HEADER UPDATE */
> >
> > #ifdef KVM_CAP_IRQ_ROUTING
> >
> > diff --git a/qapi-schema.json b/qapi-schema.json
> > index 4b50b652d3..120721e658 100644
> > --- a/qapi-schema.json
> > +++ b/qapi-schema.json
> > @@ -230,6 +230,34 @@
> > { 'command': 'query-kvm', 'returns': 'KvmInfo' }
> >
> > ##
> > +# @VsmtInfo:
> > +#
> > +# Information about VSMT modes
> > +#
> > +# @possible: list of available modes
> > +#
> > +# Since: 2.10
> > +##
> > +{ 'struct': 'VsmtInfo', 'data': {'possible': ['int'] } }
> > +
> > +##
> > +# @query-vsmt:
> > +#
> > +# Returns information about VSMT modes
> > +#
> > +# Returns: @VsmtInfo
> > +#
> > +# Since: 2.10
> > +#
> > +# Example:
> > +#
> > +# -> { "execute": "query-vsmt" }
> > +# <- { "return": { "possible": [8] } }
> > +#
> > +##
> > +{ 'command': 'query-vsmt', 'returns': 'VsmtInfo' }
> > +
> > +##
> > # @RunState:
> > #
> > # An enumeration of VM run states.
> > diff --git a/qmp.c b/qmp.c
> > index 7ee9bcfdcf..7960e400e1 100644
> > --- a/qmp.c
> > +++ b/qmp.c
> > @@ -73,6 +73,26 @@ KvmInfo *qmp_query_kvm(Error **errp)
> > return info;
> > }
> >
> > +VsmtInfo *qmp_query_vsmt(Error **errp)
> > +{
> > + VsmtInfo *info = g_malloc0(sizeof(*info));
> > + intList *list = NULL, *entry;
> > + int i;
> > +
> > + for (i = 63; i <= 0; i++) {
> > + if ((1 << i) & kvmppc_smt_possible) {
> > + entry = g_malloc0(sizeof(*entry));
> > + entry->value = (1UL << i);
> > + entry->next = list;
> > + list = entry;
> > + }
> > + }
> > +
> > + info->possible = list;
> > +
> > + return info;
> > +}
> > +
> > UuidInfo *qmp_query_uuid(Error **errp)
> > {
> > UuidInfo *info = g_malloc0(sizeof(*info));
>
> --
> David Gibson | I'll have my music baroque, and my code
> david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_
> _other_
> | _way_ _around_!
> http://www.ozlabs.org/~dgibson