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Re: [Qemu-devel] [RFC PATCH v1 07/13] spapr: Start all the threads of CP
From: |
David Gibson |
Subject: |
Re: [Qemu-devel] [RFC PATCH v1 07/13] spapr: Start all the threads of CPU core when core is hotplugged |
Date: |
Thu, 29 Jan 2015 12:36:55 +1100 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Thu, Jan 08, 2015 at 11:40:14AM +0530, Bharata B Rao wrote:
> PowerPC kernel adds or removes CPUs in core granularity and hence
> onlines/offlines all the SMT threads of a core during hot plug/unplug.
> Support this notion by starting all SMT threads of a core when a core
> is hotplugged.
>
> Signed-off-by: Bharata B Rao <address@hidden>
> ---
> hw/ppc/spapr.c | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
>
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index a293a59..4347471 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -1376,6 +1376,8 @@ static void spapr_drc_reset(void *opaque)
> }
> }
>
> +static const char *current_cpu_model;
More new global variables? Please don't.
> /* pSeries LPAR / sPAPR hardware init */
> static void ppc_spapr_init(MachineState *machine)
> {
> @@ -1473,6 +1475,8 @@ static void ppc_spapr_init(MachineState *machine)
> }
> }
>
> + current_cpu_model = cpu_model;
> +
> /* allocate RAM */
> spapr->ram_limit = ram_size;
> spapr->maxram_limit = machine->maxram_size;
> @@ -1912,10 +1916,31 @@ static void spapr_cpu_plug(HotplugHandler
> *hotplug_dev, DeviceState *dev,
> PowerPCCPU *cpu = POWERPC_CPU(cs);
> sPAPRDRConnector *drc =
> spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_CPU,
> cpu->cpu_dt_id);
> + int id = ppc_get_vcpu_dt_id(cpu);
> + int smt = kvmppc_smt_threads();
> + int i;
> +
> + /*
> + * SMT threads return from here, only main thread (core) will
> + * continue, create threads and signal hotplug event to the guest.
> + */
> + if ((id % smt) != 0) {
> + return;
> + }
>
> /* TODO: Check if DR is enabled ? */
> g_assert(drc);
>
> + /* Start rest of the SMT threads of the hot plugged core */
> + for (i = 1; i < smp_threads; i++) {
> + cpu = cpu_ppc_init(current_cpu_model);
> + if (cpu == NULL) {
> + fprintf(stderr, "Unable to find PowerPC CPU definition\n");
> + exit(1);
> + }
> + spapr_cpu_reset(cpu);
> + }
> +
> spapr_cpu_reset(POWERPC_CPU(CPU(dev)));
> spapr_cpu_hotplug_add(dev, cs);
> spapr_hotplug_req_add_event(drc);
--
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
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- [Qemu-devel] [RFC PATCH v1 03/13] spapr: Consider max_cpus during xics initialization, (continued)
- [Qemu-devel] [RFC PATCH v1 03/13] spapr: Consider max_cpus during xics initialization, Bharata B Rao, 2015/01/08
- [Qemu-devel] [RFC PATCH v1 04/13] spapr: Factor out CPU initialization code into realizefn, Bharata B Rao, 2015/01/08
- [Qemu-devel] [RFC PATCH v1 01/13] spapr: enable PHB/CPU/LMB hotplug for pseries-2.3, Bharata B Rao, 2015/01/08
- [Qemu-devel] [RFC PATCH v1 13/13] spapr: Memory hotplug support, Bharata B Rao, 2015/01/08
- [Qemu-devel] [RFC PATCH v1 07/13] spapr: Start all the threads of CPU core when core is hotplugged, Bharata B Rao, 2015/01/08
- Re: [Qemu-devel] [RFC PATCH v1 07/13] spapr: Start all the threads of CPU core when core is hotplugged,
David Gibson <=
- [Qemu-devel] [RFC PATCH v1 05/13] spapr: Support ibm, lrdr-capacity device tree property, Bharata B Rao, 2015/01/08
- [Qemu-devel] [RFC PATCH v1 12/13] spapr: Support ibm, dynamic-reconfiguration-memory, Bharata B Rao, 2015/01/08
- [Qemu-devel] [RFC PATCH v1 09/13] spapr: CPU hot unplug support, Bharata B Rao, 2015/01/08