diff options
| -rw-r--r-- | arch/x86/xen/enlighten_pv.c | 3 | ||||
| -rw-r--r-- | arch/x86/xen/smp.h | 2 | ||||
| -rw-r--r-- | arch/x86/xen/smp_pv.c | 14 |
3 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index aeb33e0a3f76..ace2eb054053 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -200,6 +200,9 @@ static void __init xen_pv_init_platform(void) xen_set_mtrr_data(); else mtrr_overwrite_state(NULL, 0, MTRR_TYPE_WRBACK); + + /* Adjust nr_cpu_ids before "enumeration" happens */ + xen_smp_count_cpus(); } static void __init xen_pv_guest_late_init(void) diff --git a/arch/x86/xen/smp.h b/arch/x86/xen/smp.h index c20cbb14c82b..b8efdbc693f7 100644 --- a/arch/x86/xen/smp.h +++ b/arch/x86/xen/smp.h @@ -19,6 +19,7 @@ extern void xen_smp_intr_free(unsigned int cpu); int xen_smp_intr_init_pv(unsigned int cpu); void xen_smp_intr_free_pv(unsigned int cpu); +void xen_smp_count_cpus(void); void xen_smp_cpus_done(unsigned int max_cpus); void xen_smp_send_reschedule(int cpu); @@ -44,6 +45,7 @@ static inline int xen_smp_intr_init_pv(unsigned int cpu) return 0; } static inline void xen_smp_intr_free_pv(unsigned int cpu) {} +static inline void xen_smp_count_cpus(void) { } #endif /* CONFIG_SMP */ #endif diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c index 98849b3f5eac..44706f01bb9b 100644 --- a/arch/x86/xen/smp_pv.c +++ b/arch/x86/xen/smp_pv.c @@ -411,6 +411,20 @@ static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id) return IRQ_HANDLED; } +void __init xen_smp_count_cpus(void) +{ + unsigned int cpus; + + for (cpus = 0; cpus < nr_cpu_ids; cpus++) { + if (HYPERVISOR_vcpu_op(VCPUOP_is_up, cpus, NULL) < 0) + break; + } + + pr_info("Xen PV: Detected %u vCPUS\n", cpus); + if (cpus < nr_cpu_ids) + set_nr_cpu_ids(cpus); +} + static const struct smp_ops xen_smp_ops __initconst = { .smp_prepare_boot_cpu = xen_pv_smp_prepare_boot_cpu, .smp_prepare_cpus = xen_pv_smp_prepare_cpus, |