diff options
author | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2016-09-07 17:19:00 (GMT) |
---|---|---|
committer | David Vrabel <david.vrabel@citrix.com> | 2016-09-30 10:22:59 (GMT) |
commit | 4d737042d6c4ee10a632cf94b953169d13955a40 (patch) | |
tree | 5387cd1964846509b0de26f894ac7620c25eb785 /arch/x86/xen | |
parent | 8129554c643b0e1a8336d842cce2f3d595aeeed7 (diff) | |
download | linux-4d737042d6c4ee10a632cf94b953169d13955a40.tar.xz |
xen/x86: Convert to hotplug state machine
Switch to new CPU hotplug infrastructure.
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Suggested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Diffstat (limited to 'arch/x86/xen')
-rw-r--r-- | arch/x86/xen/enlighten.c | 115 |
1 files changed, 65 insertions, 50 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index c7f6b1f9..a9ba14a 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -140,7 +140,9 @@ RESERVE_BRK(shared_info_page_brk, PAGE_SIZE); __read_mostly int xen_have_vector_callback; EXPORT_SYMBOL_GPL(xen_have_vector_callback); -static struct notifier_block xen_cpu_notifier; +static int xen_cpu_up_prepare(unsigned int cpu); +static int xen_cpu_up_online(unsigned int cpu); +static int xen_cpu_dead(unsigned int cpu); /* * Point at some empty memory to start with. We map the real shared_info @@ -1541,6 +1543,24 @@ static void __init xen_dom0_set_legacy_features(void) x86_platform.legacy.rtc = 1; } +static int xen_cpuhp_setup(void) +{ + int rc; + + rc = cpuhp_setup_state_nocalls(CPUHP_XEN_PREPARE, + "XEN_HVM_GUEST_PREPARE", + xen_cpu_up_prepare, xen_cpu_dead); + if (rc >= 0) { + rc = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, + "XEN_HVM_GUEST_ONLINE", + xen_cpu_up_online, NULL); + if (rc < 0) + cpuhp_remove_state_nocalls(CPUHP_XEN_PREPARE); + } + + return rc >= 0 ? 0 : rc; +} + /* First C function to be called on Xen boot */ asmlinkage __visible void __init xen_start_kernel(void) { @@ -1629,7 +1649,7 @@ asmlinkage __visible void __init xen_start_kernel(void) xen_initial_gdt = &per_cpu(gdt_page, 0); xen_smp_init(); - register_cpu_notifier(&xen_cpu_notifier); + WARN_ON(xen_cpuhp_setup()); #ifdef CONFIG_ACPI_NUMA /* @@ -1823,63 +1843,58 @@ static void __init init_hvm_pv_info(void) xen_domain_type = XEN_HVM_DOMAIN; } -static int xen_cpu_notify(struct notifier_block *self, unsigned long action, - void *hcpu) +static int xen_cpu_up_prepare(unsigned int cpu) { - int cpu = (long)hcpu; int rc; - switch (action) { - case CPU_UP_PREPARE: - if (xen_hvm_domain()) { - /* - * This can happen if CPU was offlined earlier and - * offlining timed out in common_cpu_die(). - */ - if (cpu_report_state(cpu) == CPU_DEAD_FROZEN) { - xen_smp_intr_free(cpu); - xen_uninit_lock_cpu(cpu); - } - - if (cpu_acpi_id(cpu) != U32_MAX) - per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu); - else - per_cpu(xen_vcpu_id, cpu) = cpu; - xen_vcpu_setup(cpu); + if (xen_hvm_domain()) { + /* + * This can happen if CPU was offlined earlier and + * offlining timed out in common_cpu_die(). + */ + if (cpu_report_state(cpu) == CPU_DEAD_FROZEN) { + xen_smp_intr_free(cpu); + xen_uninit_lock_cpu(cpu); } - if (xen_pv_domain() || - (xen_have_vector_callback && - xen_feature(XENFEAT_hvm_safe_pvclock))) - xen_setup_timer(cpu); + if (cpu_acpi_id(cpu) != U32_MAX) + per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu); + else + per_cpu(xen_vcpu_id, cpu) = cpu; + xen_vcpu_setup(cpu); + } - rc = xen_smp_intr_init(cpu); - if (rc) { - WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n", - cpu, rc); - return NOTIFY_BAD; - } + if (xen_pv_domain() || + (xen_have_vector_callback && + xen_feature(XENFEAT_hvm_safe_pvclock))) + xen_setup_timer(cpu); - break; - case CPU_ONLINE: - xen_init_lock_cpu(cpu); - break; - case CPU_UP_CANCELED: - xen_smp_intr_free(cpu); - if (xen_pv_domain() || - (xen_have_vector_callback && - xen_feature(XENFEAT_hvm_safe_pvclock))) - xen_teardown_timer(cpu); - break; - default: - break; + rc = xen_smp_intr_init(cpu); + if (rc) { + WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n", + cpu, rc); + return rc; } - return NOTIFY_OK; + return 0; } -static struct notifier_block xen_cpu_notifier = { - .notifier_call = xen_cpu_notify, -}; +static int xen_cpu_dead(unsigned int cpu) +{ + xen_smp_intr_free(cpu); + + if (xen_pv_domain() || + (xen_have_vector_callback && + xen_feature(XENFEAT_hvm_safe_pvclock))) + xen_teardown_timer(cpu); + + return 0; +} + +static int xen_cpu_up_online(unsigned int cpu) +{ + xen_init_lock_cpu(cpu); + return 0; +} #ifdef CONFIG_KEXEC_CORE static void xen_hvm_shutdown(void) @@ -1910,7 +1925,7 @@ static void __init xen_hvm_guest_init(void) if (xen_feature(XENFEAT_hvm_callback_vector)) xen_have_vector_callback = 1; xen_hvm_smp_init(); - register_cpu_notifier(&xen_cpu_notifier); + WARN_ON(xen_cpuhp_setup()); xen_unplug_emulated_devices(); x86_init.irqs.intr_init = xen_init_IRQ; xen_hvm_init_time_ops(); |