diff options
| -rw-r--r-- | arch/x86/xen/enlighten.c | 45 | ||||
| -rw-r--r-- | arch/x86/xen/enlighten_hvm.c | 20 | ||||
| -rw-r--r-- | arch/x86/xen/smp_hvm.c | 10 | ||||
| -rw-r--r-- | arch/x86/xen/suspend_hvm.c | 11 | ||||
| -rw-r--r-- | include/xen/xen-ops.h | 2 |
5 files changed, 54 insertions, 34 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 96b745e3f56c..276cc21619ec 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -106,6 +106,21 @@ int xen_cpuhp_setup(int (*cpu_up_prepare_cb)(unsigned int), return rc >= 0 ? 0 : rc; } +static void xen_vcpu_setup_restore(int cpu) +{ + /* Any per_cpu(xen_vcpu) is stale, so reset it */ + xen_vcpu_info_reset(cpu); + + /* + * For PVH and PVHVM, setup online VCPUs only. The rest will + * be handled by hotplug. + */ + if (xen_pv_domain() || + (xen_hvm_domain() && cpu_online(cpu))) { + xen_vcpu_setup(cpu); + } +} + /* * On restore, set the vcpu placement up again. * If it fails, then we're in a bad state, since @@ -117,17 +132,23 @@ void xen_vcpu_restore(void) for_each_possible_cpu(cpu) { bool other_cpu = (cpu != smp_processor_id()); - bool is_up = HYPERVISOR_vcpu_op(VCPUOP_is_up, xen_vcpu_nr(cpu), - NULL); + bool is_up; + + if (xen_vcpu_nr(cpu) == XEN_VCPU_ID_INVALID) + continue; + + /* Only Xen 4.5 and higher support this. */ + is_up = HYPERVISOR_vcpu_op(VCPUOP_is_up, + xen_vcpu_nr(cpu), NULL) > 0; if (other_cpu && is_up && HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL)) BUG(); - xen_setup_runstate_info(cpu); + if (xen_pv_domain() || xen_feature(XENFEAT_hvm_safe_pvclock)) + xen_setup_runstate_info(cpu); - if (xen_have_vcpu_info_placement) - xen_vcpu_setup(cpu); + xen_vcpu_setup_restore(cpu); if (other_cpu && is_up && HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL)) @@ -163,11 +184,11 @@ void xen_vcpu_setup(int cpu) BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info); /* - * This path is called twice on PVHVM - first during bootup via - * smp_init -> xen_hvm_cpu_notify, and then if the VCPU is being - * hotplugged: cpu_up -> xen_hvm_cpu_notify. - * As we can only do the VCPUOP_register_vcpu_info once lets - * not over-write its result. + * This path is called on PVHVM at bootup (xen_hvm_smp_prepare_boot_cpu) + * and at restore (xen_vcpu_restore). Also called for hotplugged + * VCPUs (cpu_init -> xen_hvm_cpu_prepare_hvm). + * However, the hypercall can only be done once (see below) so if a VCPU + * is offlined and comes back online then let's not redo the hypercall. * * For PV it is called during restore (xen_vcpu_restore) and bootup * (xen_setup_vcpu_info_placement). The hotplug mechanism does not @@ -178,8 +199,6 @@ void xen_vcpu_setup(int cpu) return; } - xen_vcpu_info_reset(cpu); - if (xen_have_vcpu_info_placement) { vcpup = &per_cpu(xen_vcpu_info, cpu); info.mfn = arbitrary_virt_to_mfn(vcpup); @@ -214,7 +233,7 @@ void xen_vcpu_setup(int cpu) if (!xen_have_vcpu_info_placement) { if (cpu >= MAX_VIRT_CPUS) clamp_max_cpus(); - return; + xen_vcpu_info_reset(cpu); } } diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c index eb53da6547ee..ba1afadb2512 100644 --- a/arch/x86/xen/enlighten_hvm.c +++ b/arch/x86/xen/enlighten_hvm.c @@ -20,7 +20,6 @@ void __ref xen_hvm_init_shared_info(void) { - int cpu; struct xen_add_to_physmap xatp; static struct shared_info *shared_info_page; @@ -35,18 +34,6 @@ void __ref xen_hvm_init_shared_info(void) BUG(); HYPERVISOR_shared_info = (struct shared_info *)shared_info_page; - - /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info - * page, we use it in the event channel upcall and in some pvclock - * related functions. We don't need the vcpu_info placement - * optimizations because we don't use any pv_mmu or pv_irq op on - * HVM. - * When xen_hvm_init_shared_info is run at boot time only vcpu 0 is - * online but xen_hvm_init_shared_info is run at resume time too and - * in that case multiple vcpus might be online. */ - for_each_online_cpu(cpu) { - xen_vcpu_info_reset(cpu); - } } static void __init init_hvm_pv_info(void) @@ -150,6 +137,13 @@ static void __init xen_hvm_guest_init(void) xen_hvm_init_shared_info(); + /* + * xen_vcpu is a pointer to the vcpu_info struct in the shared_info + * page, we use it in the event channel upcall and in some pvclock + * related functions. + */ + xen_vcpu_info_reset(0); + xen_panic_handler_init(); if (xen_feature(XENFEAT_hvm_callback_vector)) diff --git a/arch/x86/xen/smp_hvm.c b/arch/x86/xen/smp_hvm.c index 9e0fb9a015d4..6c8a805819ff 100644 --- a/arch/x86/xen/smp_hvm.c +++ b/arch/x86/xen/smp_hvm.c @@ -28,10 +28,20 @@ static void __init xen_hvm_smp_prepare_boot_cpu(void) static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus) { + int cpu; + native_smp_prepare_cpus(max_cpus); WARN_ON(xen_smp_intr_init(0)); xen_init_lock_cpu(0); + + for_each_possible_cpu(cpu) { + if (cpu == 0) + continue; + + /* Set default vcpu_id to make sure that we don't use cpu-0's */ + per_cpu(xen_vcpu_id, cpu) = XEN_VCPU_ID_INVALID; + } } #ifdef CONFIG_HOTPLUG_CPU diff --git a/arch/x86/xen/suspend_hvm.c b/arch/x86/xen/suspend_hvm.c index 01afcadde50a..484999416d8b 100644 --- a/arch/x86/xen/suspend_hvm.c +++ b/arch/x86/xen/suspend_hvm.c @@ -8,15 +8,10 @@ void xen_hvm_post_suspend(int suspend_cancelled) { - int cpu; - - if (!suspend_cancelled) + if (!suspend_cancelled) { xen_hvm_init_shared_info(); + xen_vcpu_restore(); + } xen_callback_vector(); xen_unplug_emulated_devices(); - if (xen_feature(XENFEAT_hvm_safe_pvclock)) { - for_each_online_cpu(cpu) { - xen_setup_runstate_info(cpu); - } - } } diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h index c44a2ee8c8f8..218e6aae5433 100644 --- a/include/xen/xen-ops.h +++ b/include/xen/xen-ops.h @@ -15,6 +15,8 @@ static inline uint32_t xen_vcpu_nr(int cpu) return per_cpu(xen_vcpu_id, cpu); } +#define XEN_VCPU_ID_INVALID U32_MAX + void xen_arch_pre_suspend(void); void xen_arch_post_suspend(int suspend_cancelled); |