* kernelfans@xxxxxxxxx <kernelfans@xxxxxxxxx> [2014-10-16 15:29:52]:
> When kvm is enabled on a core, we migrate all external irq to primary
> thread. Since currently, the kvmirq logic is handled by the primary
> hwthread.
>
> Todo: this patch lacks re-enable of irqbalance when kvm is disable on
> the core
>
> Signed-off-by: Liu Ping Fan <pingfank@xxxxxxxxxxxxxxxxxx>
> ---
> arch/powerpc/kernel/sysfs.c | 39 ++++++++++++++++++++++++++++++++++
> arch/powerpc/sysdev/xics/xics-common.c | 12 +++++++++++
> 2 files changed, 51 insertions(+)
>
> diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
> index 67fd2fd..a2595dd 100644
> --- a/arch/powerpc/kernel/sysfs.c
> +++ b/arch/powerpc/kernel/sysfs.c
> @@ -552,6 +552,45 @@ static void sysfs_create_dscr_default(void)
> if (cpu_has_feature(CPU_FTR_DSCR))
> err = device_create_file(cpu_subsys.dev_root, &dev_attr_dscr_default);
> }
> +
> +#ifdef CONFIG_KVMPPC_ENABLE_SECONDARY
> +#define NR_CORES (CONFIG_NR_CPUS/threads_per_core)
> +static DECLARE_BITMAP(kvm_on_core, NR_CORES) __read_mostly
> +
> +static ssize_t show_kvm_enable(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> +}
> +
> +static ssize_t __used store_kvm_enable(struct device *dev,
> + struct device_attribute *attr, const char *buf,
> + size_t count)
> +{
> + struct cpumask stop_cpus;
> + unsigned long core, thr;
> +
> + sscanf(buf, "%lx", &core);
> + if (core > NR_CORES)
> + return -1;
> + if (!test_bit(core, &kvm_on_core))
> + for (thr = 1; thr< threads_per_core; thr++)
> + if (cpu_online(thr * threads_per_core + thr))
> + cpumask_set_cpu(thr * threads_per_core + thr, &stop_cpus);
Shouldnt this be
if (cpu_online(core * threads_per_core + thr))
cpumask_set_cpu(core * threads_per_core + thr, &stop_cpus);
?
--
Thanks and Regards
Srikar Dronamraju
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