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Re: [PATCH v3 1/2] numa: Require distance map when empty node exists
From: |
Igor Mammedov |
Subject: |
Re: [PATCH v3 1/2] numa: Require distance map when empty node exists |
Date: |
Wed, 13 Oct 2021 13:30:11 +0200 |
On Wed, 13 Oct 2021 12:58:04 +0800
Gavin Shan <gshan@redhat.com> wrote:
> The following option is used to specify the distance map. It's
> possible the option isn't provided by user. In this case, the
> distance map isn't populated and exposed to platform. On the
> other hand, the empty NUMA node, where no memory resides, is
> allowed on platforms like ARM64 virt. For these empty NUMA
> nodes, their corresponding device-tree nodes aren't populated,
> but their NUMA IDs should be included in the "/distance-map"
> device-tree node, so that kernel can probe them properly if
> device-tree is used.
>
> -numa,dist,src=<numa_id>,dst=<numa_id>,val=<distance>
>
> This adds extra check after the machine is initialized, to
> ask for the distance map from user when empty nodes exist in
> device-tree.
>
> Signed-off-by: Gavin Shan <gshan@redhat.com>
> ---
> hw/core/machine.c | 4 ++++
> hw/core/numa.c | 24 ++++++++++++++++++++++++
> include/sysemu/numa.h | 1 +
> 3 files changed, 29 insertions(+)
>
> diff --git a/hw/core/machine.c b/hw/core/machine.c
> index b8d95eec32..c0765ad973 100644
> --- a/hw/core/machine.c
> +++ b/hw/core/machine.c
> @@ -1355,6 +1355,10 @@ void machine_run_board_init(MachineState *machine)
> accel_init_interfaces(ACCEL_GET_CLASS(machine->accelerator));
> machine_class->init(machine);
> phase_advance(PHASE_MACHINE_INITIALIZED);
> +
> + if (machine->numa_state) {
> + numa_complete_validation(machine);
> + }
> }
>
> static NotifierList machine_init_done_notifiers =
> diff --git a/hw/core/numa.c b/hw/core/numa.c
> index 510d096a88..7404b7dd38 100644
> --- a/hw/core/numa.c
> +++ b/hw/core/numa.c
> @@ -727,6 +727,30 @@ void numa_complete_configuration(MachineState *ms)
> }
> }
>
> +/*
> + * When device-tree is used by the machine, the empty node IDs should
> + * be included in the distance map. So we need provide pairs of distances
> + * in this case.
> + */
> +void numa_complete_validation(MachineState *ms)
> +{
> + NodeInfo *numa_info = ms->numa_state->nodes;
> + int nb_numa_nodes = ms->numa_state->num_nodes;
> + int i;
> +
> + if (!ms->fdt || ms->numa_state->have_numa_distance) {
also skip check/limitation when VM is launched with ACPI enabled?
> + return;
> + }
> +
> + for (i = 0; i < nb_numa_nodes; i++) {
> + if (numa_info[i].present && !numa_info[i].node_mem) {
> + error_report("Empty node %d found, please provide "
> + "distance map.", i);
> + exit(EXIT_FAILURE);
> + }
> + }
> +}
> +
> void parse_numa_opts(MachineState *ms)
> {
> qemu_opts_foreach(qemu_find_opts("numa"), parse_numa, ms, &error_fatal);
> diff --git a/include/sysemu/numa.h b/include/sysemu/numa.h
> index 4173ef2afa..80f25ab830 100644
> --- a/include/sysemu/numa.h
> +++ b/include/sysemu/numa.h
> @@ -104,6 +104,7 @@ void parse_numa_hmat_lb(NumaState *numa_state,
> NumaHmatLBOptions *node,
> void parse_numa_hmat_cache(MachineState *ms, NumaHmatCacheOptions *node,
> Error **errp);
> void numa_complete_configuration(MachineState *ms);
> +void numa_complete_validation(MachineState *ms);
> void query_numa_node_mem(NumaNodeMem node_mem[], MachineState *ms);
> extern QemuOptsList qemu_numa_opts;
> void numa_cpu_pre_plug(const struct CPUArchId *slot, DeviceState *dev,
- [PATCH v3 0/2] hw/arm/virt: Fix qemu booting failure on device-tree, Gavin Shan, 2021/10/13
- [PATCH v3 2/2] hw/arm/virt: Don't create device-tree node for empty NUMA node, Gavin Shan, 2021/10/13
- [PATCH v3 1/2] numa: Require distance map when empty node exists, Gavin Shan, 2021/10/13
- Re: [PATCH v3 1/2] numa: Require distance map when empty node exists, Andrew Jones, 2021/10/13
- Re: [PATCH v3 1/2] numa: Require distance map when empty node exists,
Igor Mammedov <=
- Re: [PATCH v3 1/2] numa: Require distance map when empty node exists, Andrew Jones, 2021/10/13
- Re: [PATCH v3 1/2] numa: Require distance map when empty node exists, Igor Mammedov, 2021/10/13
- Re: [PATCH v3 1/2] numa: Require distance map when empty node exists, Andrew Jones, 2021/10/13
- Re: [PATCH v3 1/2] numa: Require distance map when empty node exists, Andrew Jones, 2021/10/13
- Re: [PATCH v3 1/2] numa: Require distance map when empty node exists, Igor Mammedov, 2021/10/14
- Re: [PATCH v3 1/2] numa: Require distance map when empty node exists, Andrew Jones, 2021/10/14
- Re: [PATCH v3 1/2] numa: Require distance map when empty node exists, Gavin Shan, 2021/10/15
- Re: [PATCH v3 1/2] numa: Require distance map when empty node exists, Andrew Jones, 2021/10/15
- Re: [PATCH v3 1/2] numa: Require distance map when empty node exists, Gavin Shan, 2021/10/15