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https://github.com/FEX-Emu/linux.git
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x86/xen: split off smp_pv.c
Basically, smp.c is renamed to smp_pv.c and some code moved out to common smp.c. struct xen_common_irq delcaration ended up in smp.h. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Reviewed-by: Juergen Gross <jgross@suse.com> Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Vitaly Kuznetsov
Juergen Gross
parent
a52482d935
commit
83b96794e0
@ -20,7 +20,7 @@ obj-$(CONFIG_XEN_PVH) += enlighten_pvh.o
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obj-$(CONFIG_EVENT_TRACING) += trace.o
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_SMP) += smp.o smp_pv.o
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obj-$(CONFIG_XEN_PVHVM_SMP) += smp_hvm.o
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obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o
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obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o
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@ -1,63 +1,21 @@
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/*
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* Xen SMP support
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*
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* This file implements the Xen versions of smp_ops. SMP under Xen is
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* very straightforward. Bringing a CPU up is simply a matter of
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* loading its initial context and setting it running.
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*
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* IPIs are handled through the Xen event mechanism.
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*
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* Because virtual CPUs can be scheduled onto any real CPU, there's no
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* useful topology information for the kernel to make use of. As a
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* result, all CPUs are treated as if they're single-core and
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* single-threaded.
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*/
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#include <linux/sched.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include <linux/irq_work.h>
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#include <linux/tick.h>
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#include <linux/nmi.h>
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#include <linux/slab.h>
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#include <linux/cpumask.h>
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#include <linux/percpu.h>
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#include <asm/paravirt.h>
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#include <asm/desc.h>
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#include <asm/pgtable.h>
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#include <asm/cpu.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/vcpu.h>
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#include <xen/interface/xenpmu.h>
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#include <asm/xen/interface.h>
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#include <asm/xen/hypercall.h>
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#include <xen/xen.h>
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#include <xen/page.h>
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#include <xen/events.h>
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#include <xen/hvc-console.h>
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#include "xen-ops.h"
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#include "mmu.h"
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#include "smp.h"
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#include "pmu.h"
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cpumask_var_t xen_cpu_initialized_map;
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struct xen_common_irq {
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int irq;
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char *name;
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};
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static DEFINE_PER_CPU(struct xen_common_irq, xen_resched_irq) = { .irq = -1 };
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static DEFINE_PER_CPU(struct xen_common_irq, xen_callfunc_irq) = { .irq = -1 };
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static DEFINE_PER_CPU(struct xen_common_irq, xen_callfuncsingle_irq) = { .irq = -1 };
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static DEFINE_PER_CPU(struct xen_common_irq, xen_irq_work) = { .irq = -1 };
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static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .irq = -1 };
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static DEFINE_PER_CPU(struct xen_common_irq, xen_pmu_irq) = { .irq = -1 };
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static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
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static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
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static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);
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/*
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* Reschedule call back.
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@ -70,42 +28,6 @@ static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
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return IRQ_HANDLED;
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}
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static void cpu_bringup(void)
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{
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int cpu;
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cpu_init();
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touch_softlockup_watchdog();
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preempt_disable();
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/* PVH runs in ring 0 and allows us to do native syscalls. Yay! */
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if (!xen_feature(XENFEAT_supervisor_mode_kernel)) {
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xen_enable_sysenter();
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xen_enable_syscall();
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}
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cpu = smp_processor_id();
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smp_store_cpu_info(cpu);
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cpu_data(cpu).x86_max_cores = 1;
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set_cpu_sibling_map(cpu);
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xen_setup_cpu_clockevents();
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notify_cpu_starting(cpu);
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set_cpu_online(cpu, true);
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cpu_set_state_online(cpu); /* Implies full memory barrier. */
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/* We can take interrupts now: we're officially "up". */
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local_irq_enable();
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}
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asmlinkage __visible void cpu_bringup_and_idle(void)
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{
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cpu_bringup();
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cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
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}
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void xen_smp_intr_free(unsigned int cpu)
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{
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if (per_cpu(xen_resched_irq, cpu).irq >= 0) {
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@ -135,23 +57,6 @@ void xen_smp_intr_free(unsigned int cpu)
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}
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}
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void xen_smp_intr_free_pv(unsigned int cpu)
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{
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if (per_cpu(xen_irq_work, cpu).irq >= 0) {
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unbind_from_irqhandler(per_cpu(xen_irq_work, cpu).irq, NULL);
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per_cpu(xen_irq_work, cpu).irq = -1;
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kfree(per_cpu(xen_irq_work, cpu).name);
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per_cpu(xen_irq_work, cpu).name = NULL;
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}
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if (per_cpu(xen_pmu_irq, cpu).irq >= 0) {
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unbind_from_irqhandler(per_cpu(xen_pmu_irq, cpu).irq, NULL);
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per_cpu(xen_pmu_irq, cpu).irq = -1;
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kfree(per_cpu(xen_pmu_irq, cpu).name);
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per_cpu(xen_pmu_irq, cpu).name = NULL;
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}
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}
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int xen_smp_intr_init(unsigned int cpu)
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{
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int rc;
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@ -209,360 +114,6 @@ int xen_smp_intr_init(unsigned int cpu)
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return rc;
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}
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int xen_smp_intr_init_pv(unsigned int cpu)
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{
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int rc;
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char *callfunc_name, *pmu_name;
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callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
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rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
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cpu,
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xen_irq_work_interrupt,
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IRQF_PERCPU|IRQF_NOBALANCING,
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callfunc_name,
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NULL);
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if (rc < 0)
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goto fail;
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per_cpu(xen_irq_work, cpu).irq = rc;
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per_cpu(xen_irq_work, cpu).name = callfunc_name;
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if (is_xen_pmu(cpu)) {
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pmu_name = kasprintf(GFP_KERNEL, "pmu%d", cpu);
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rc = bind_virq_to_irqhandler(VIRQ_XENPMU, cpu,
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xen_pmu_irq_handler,
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IRQF_PERCPU|IRQF_NOBALANCING,
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pmu_name, NULL);
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if (rc < 0)
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goto fail;
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per_cpu(xen_pmu_irq, cpu).irq = rc;
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per_cpu(xen_pmu_irq, cpu).name = pmu_name;
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}
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return 0;
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fail:
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xen_smp_intr_free_pv(cpu);
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return rc;
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}
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static void __init xen_fill_possible_map(void)
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{
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int i, rc;
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if (xen_initial_domain())
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return;
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for (i = 0; i < nr_cpu_ids; i++) {
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rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
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if (rc >= 0) {
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num_processors++;
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set_cpu_possible(i, true);
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}
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}
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}
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static void __init xen_filter_cpu_maps(void)
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{
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int i, rc;
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unsigned int subtract = 0;
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if (!xen_initial_domain())
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return;
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num_processors = 0;
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disabled_cpus = 0;
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for (i = 0; i < nr_cpu_ids; i++) {
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rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
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if (rc >= 0) {
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num_processors++;
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set_cpu_possible(i, true);
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} else {
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set_cpu_possible(i, false);
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set_cpu_present(i, false);
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subtract++;
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}
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}
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#ifdef CONFIG_HOTPLUG_CPU
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/* This is akin to using 'nr_cpus' on the Linux command line.
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* Which is OK as when we use 'dom0_max_vcpus=X' we can only
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* have up to X, while nr_cpu_ids is greater than X. This
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* normally is not a problem, except when CPU hotplugging
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* is involved and then there might be more than X CPUs
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* in the guest - which will not work as there is no
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* hypercall to expand the max number of VCPUs an already
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* running guest has. So cap it up to X. */
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if (subtract)
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nr_cpu_ids = nr_cpu_ids - subtract;
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#endif
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}
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static void __init xen_pv_smp_prepare_boot_cpu(void)
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{
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BUG_ON(smp_processor_id() != 0);
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native_smp_prepare_boot_cpu();
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if (!xen_feature(XENFEAT_writable_page_tables))
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/* We've switched to the "real" per-cpu gdt, so make
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* sure the old memory can be recycled. */
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make_lowmem_page_readwrite(xen_initial_gdt);
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#ifdef CONFIG_X86_32
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/*
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* Xen starts us with XEN_FLAT_RING1_DS, but linux code
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* expects __USER_DS
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*/
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loadsegment(ds, __USER_DS);
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loadsegment(es, __USER_DS);
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#endif
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xen_filter_cpu_maps();
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xen_setup_vcpu_info_placement();
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/*
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* The alternative logic (which patches the unlock/lock) runs before
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* the smp bootup up code is activated. Hence we need to set this up
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* the core kernel is being patched. Otherwise we will have only
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* modules patched but not core code.
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*/
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xen_init_spinlocks();
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}
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static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
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{
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unsigned cpu;
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unsigned int i;
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if (skip_ioapic_setup) {
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char *m = (max_cpus == 0) ?
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"The nosmp parameter is incompatible with Xen; " \
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"use Xen dom0_max_vcpus=1 parameter" :
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"The noapic parameter is incompatible with Xen";
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xen_raw_printk(m);
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panic(m);
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}
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xen_init_lock_cpu(0);
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smp_store_boot_cpu_info();
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cpu_data(0).x86_max_cores = 1;
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for_each_possible_cpu(i) {
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zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
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zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
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zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
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}
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set_cpu_sibling_map(0);
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xen_pmu_init(0);
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if (xen_smp_intr_init(0))
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BUG();
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if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
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panic("could not allocate xen_cpu_initialized_map\n");
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cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));
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/* Restrict the possible_map according to max_cpus. */
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while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
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for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
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continue;
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set_cpu_possible(cpu, false);
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}
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for_each_possible_cpu(cpu)
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set_cpu_present(cpu, true);
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}
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static int
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cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
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{
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struct vcpu_guest_context *ctxt;
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struct desc_struct *gdt;
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unsigned long gdt_mfn;
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/* used to tell cpu_init() that it can proceed with initialization */
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cpumask_set_cpu(cpu, cpu_callout_mask);
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if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
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return 0;
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ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
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if (ctxt == NULL)
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return -ENOMEM;
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gdt = get_cpu_gdt_rw(cpu);
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#ifdef CONFIG_X86_32
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ctxt->user_regs.fs = __KERNEL_PERCPU;
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ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
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#endif
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memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
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ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
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ctxt->flags = VGCF_IN_KERNEL;
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ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
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ctxt->user_regs.ds = __USER_DS;
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ctxt->user_regs.es = __USER_DS;
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ctxt->user_regs.ss = __KERNEL_DS;
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xen_copy_trap_info(ctxt->trap_ctxt);
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ctxt->ldt_ents = 0;
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BUG_ON((unsigned long)gdt & ~PAGE_MASK);
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gdt_mfn = arbitrary_virt_to_mfn(gdt);
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make_lowmem_page_readonly(gdt);
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make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
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ctxt->gdt_frames[0] = gdt_mfn;
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ctxt->gdt_ents = GDT_ENTRIES;
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ctxt->kernel_ss = __KERNEL_DS;
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ctxt->kernel_sp = idle->thread.sp0;
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#ifdef CONFIG_X86_32
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ctxt->event_callback_cs = __KERNEL_CS;
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ctxt->failsafe_callback_cs = __KERNEL_CS;
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#else
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ctxt->gs_base_kernel = per_cpu_offset(cpu);
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#endif
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ctxt->event_callback_eip =
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(unsigned long)xen_hypervisor_callback;
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ctxt->failsafe_callback_eip =
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(unsigned long)xen_failsafe_callback;
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ctxt->user_regs.cs = __KERNEL_CS;
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per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
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ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
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ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_gfn(swapper_pg_dir));
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if (HYPERVISOR_vcpu_op(VCPUOP_initialise, xen_vcpu_nr(cpu), ctxt))
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BUG();
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kfree(ctxt);
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return 0;
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}
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static int xen_cpu_up(unsigned int cpu, struct task_struct *idle)
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{
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int rc;
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common_cpu_up(cpu, idle);
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xen_setup_runstate_info(cpu);
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/*
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* PV VCPUs are always successfully taken down (see 'while' loop
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* in xen_cpu_die()), so -EBUSY is an error.
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*/
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rc = cpu_check_up_prepare(cpu);
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if (rc)
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return rc;
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/* make sure interrupts start blocked */
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per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;
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rc = cpu_initialize_context(cpu, idle);
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if (rc)
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return rc;
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xen_pmu_init(cpu);
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rc = HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL);
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BUG_ON(rc);
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while (cpu_report_state(cpu) != CPU_ONLINE)
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HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
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return 0;
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}
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static void xen_smp_cpus_done(unsigned int max_cpus)
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{
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}
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#ifdef CONFIG_HOTPLUG_CPU
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static int xen_cpu_disable(void)
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{
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unsigned int cpu = smp_processor_id();
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if (cpu == 0)
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return -EBUSY;
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cpu_disable_common();
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load_cr3(swapper_pg_dir);
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return 0;
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}
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static void xen_pv_cpu_die(unsigned int cpu)
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{
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while (HYPERVISOR_vcpu_op(VCPUOP_is_up,
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xen_vcpu_nr(cpu), NULL)) {
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__set_current_state(TASK_UNINTERRUPTIBLE);
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schedule_timeout(HZ/10);
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}
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if (common_cpu_die(cpu) == 0) {
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xen_smp_intr_free(cpu);
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xen_uninit_lock_cpu(cpu);
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xen_teardown_timer(cpu);
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xen_pmu_finish(cpu);
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}
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}
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static void xen_play_dead(void) /* used only with HOTPLUG_CPU */
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{
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play_dead_common();
|
||||
HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(smp_processor_id()), NULL);
|
||||
cpu_bringup();
|
||||
/*
|
||||
* commit 4b0c0f294 (tick: Cleanup NOHZ per cpu data on cpu down)
|
||||
* clears certain data that the cpu_idle loop (which called us
|
||||
* and that we return from) expects. The only way to get that
|
||||
* data back is to call:
|
||||
*/
|
||||
tick_nohz_idle_enter();
|
||||
|
||||
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
|
||||
}
|
||||
|
||||
#else /* !CONFIG_HOTPLUG_CPU */
|
||||
static int xen_cpu_disable(void)
|
||||
{
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
static void xen_pv_cpu_die(unsigned int cpu)
|
||||
{
|
||||
BUG();
|
||||
}
|
||||
|
||||
static void xen_play_dead(void)
|
||||
{
|
||||
BUG();
|
||||
}
|
||||
|
||||
#endif
|
||||
static void stop_self(void *v)
|
||||
{
|
||||
int cpu = smp_processor_id();
|
||||
|
||||
/* make sure we're not pinning something down */
|
||||
load_cr3(swapper_pg_dir);
|
||||
/* should set up a minimal gdt */
|
||||
|
||||
set_cpu_online(cpu, false);
|
||||
|
||||
HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL);
|
||||
BUG();
|
||||
}
|
||||
|
||||
static void xen_stop_other_cpus(int wait)
|
||||
{
|
||||
smp_call_function(stop_self, NULL, wait);
|
||||
}
|
||||
|
||||
void xen_smp_send_reschedule(int cpu)
|
||||
{
|
||||
xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
|
||||
@ -697,36 +248,3 @@ static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
|
||||
{
|
||||
irq_enter();
|
||||
irq_work_run();
|
||||
inc_irq_stat(apic_irq_work_irqs);
|
||||
irq_exit();
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static const struct smp_ops xen_smp_ops __initconst = {
|
||||
.smp_prepare_boot_cpu = xen_pv_smp_prepare_boot_cpu,
|
||||
.smp_prepare_cpus = xen_smp_prepare_cpus,
|
||||
.smp_cpus_done = xen_smp_cpus_done,
|
||||
|
||||
.cpu_up = xen_cpu_up,
|
||||
.cpu_die = xen_pv_cpu_die,
|
||||
.cpu_disable = xen_cpu_disable,
|
||||
.play_dead = xen_play_dead,
|
||||
|
||||
.stop_other_cpus = xen_stop_other_cpus,
|
||||
.smp_send_reschedule = xen_smp_send_reschedule,
|
||||
|
||||
.send_call_func_ipi = xen_smp_send_call_function_ipi,
|
||||
.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
|
||||
};
|
||||
|
||||
void __init xen_smp_init(void)
|
||||
{
|
||||
smp_ops = xen_smp_ops;
|
||||
xen_fill_possible_map();
|
||||
}
|
||||
|
||||
@ -17,6 +17,11 @@ void xen_smp_intr_free_pv(unsigned int cpu);
|
||||
void xen_smp_send_reschedule(int cpu);
|
||||
void xen_smp_send_call_function_ipi(const struct cpumask *mask);
|
||||
void xen_smp_send_call_function_single_ipi(int cpu);
|
||||
|
||||
struct xen_common_irq {
|
||||
int irq;
|
||||
char *name;
|
||||
};
|
||||
#else /* CONFIG_SMP */
|
||||
|
||||
static inline int xen_smp_intr_init(unsigned int cpu)
|
||||
|
||||
500
arch/x86/xen/smp_pv.c
Normal file
500
arch/x86/xen/smp_pv.c
Normal file
@ -0,0 +1,500 @@
|
||||
/*
|
||||
* Xen SMP support
|
||||
*
|
||||
* This file implements the Xen versions of smp_ops. SMP under Xen is
|
||||
* very straightforward. Bringing a CPU up is simply a matter of
|
||||
* loading its initial context and setting it running.
|
||||
*
|
||||
* IPIs are handled through the Xen event mechanism.
|
||||
*
|
||||
* Because virtual CPUs can be scheduled onto any real CPU, there's no
|
||||
* useful topology information for the kernel to make use of. As a
|
||||
* result, all CPUs are treated as if they're single-core and
|
||||
* single-threaded.
|
||||
*/
|
||||
#include <linux/sched.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/smp.h>
|
||||
#include <linux/irq_work.h>
|
||||
#include <linux/tick.h>
|
||||
#include <linux/nmi.h>
|
||||
|
||||
#include <asm/paravirt.h>
|
||||
#include <asm/desc.h>
|
||||
#include <asm/pgtable.h>
|
||||
#include <asm/cpu.h>
|
||||
|
||||
#include <xen/interface/xen.h>
|
||||
#include <xen/interface/vcpu.h>
|
||||
#include <xen/interface/xenpmu.h>
|
||||
|
||||
#include <asm/xen/interface.h>
|
||||
#include <asm/xen/hypercall.h>
|
||||
|
||||
#include <xen/xen.h>
|
||||
#include <xen/page.h>
|
||||
#include <xen/events.h>
|
||||
|
||||
#include <xen/hvc-console.h>
|
||||
#include "xen-ops.h"
|
||||
#include "mmu.h"
|
||||
#include "smp.h"
|
||||
#include "pmu.h"
|
||||
|
||||
cpumask_var_t xen_cpu_initialized_map;
|
||||
|
||||
static DEFINE_PER_CPU(struct xen_common_irq, xen_irq_work) = { .irq = -1 };
|
||||
static DEFINE_PER_CPU(struct xen_common_irq, xen_pmu_irq) = { .irq = -1 };
|
||||
|
||||
static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);
|
||||
|
||||
static void cpu_bringup(void)
|
||||
{
|
||||
int cpu;
|
||||
|
||||
cpu_init();
|
||||
touch_softlockup_watchdog();
|
||||
preempt_disable();
|
||||
|
||||
/* PVH runs in ring 0 and allows us to do native syscalls. Yay! */
|
||||
if (!xen_feature(XENFEAT_supervisor_mode_kernel)) {
|
||||
xen_enable_sysenter();
|
||||
xen_enable_syscall();
|
||||
}
|
||||
cpu = smp_processor_id();
|
||||
smp_store_cpu_info(cpu);
|
||||
cpu_data(cpu).x86_max_cores = 1;
|
||||
set_cpu_sibling_map(cpu);
|
||||
|
||||
xen_setup_cpu_clockevents();
|
||||
|
||||
notify_cpu_starting(cpu);
|
||||
|
||||
set_cpu_online(cpu, true);
|
||||
|
||||
cpu_set_state_online(cpu); /* Implies full memory barrier. */
|
||||
|
||||
/* We can take interrupts now: we're officially "up". */
|
||||
local_irq_enable();
|
||||
}
|
||||
|
||||
asmlinkage __visible void cpu_bringup_and_idle(void)
|
||||
{
|
||||
cpu_bringup();
|
||||
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
|
||||
}
|
||||
|
||||
void xen_smp_intr_free_pv(unsigned int cpu)
|
||||
{
|
||||
if (per_cpu(xen_irq_work, cpu).irq >= 0) {
|
||||
unbind_from_irqhandler(per_cpu(xen_irq_work, cpu).irq, NULL);
|
||||
per_cpu(xen_irq_work, cpu).irq = -1;
|
||||
kfree(per_cpu(xen_irq_work, cpu).name);
|
||||
per_cpu(xen_irq_work, cpu).name = NULL;
|
||||
}
|
||||
|
||||
if (per_cpu(xen_pmu_irq, cpu).irq >= 0) {
|
||||
unbind_from_irqhandler(per_cpu(xen_pmu_irq, cpu).irq, NULL);
|
||||
per_cpu(xen_pmu_irq, cpu).irq = -1;
|
||||
kfree(per_cpu(xen_pmu_irq, cpu).name);
|
||||
per_cpu(xen_pmu_irq, cpu).name = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
int xen_smp_intr_init_pv(unsigned int cpu)
|
||||
{
|
||||
int rc;
|
||||
char *callfunc_name, *pmu_name;
|
||||
|
||||
callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
|
||||
rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
|
||||
cpu,
|
||||
xen_irq_work_interrupt,
|
||||
IRQF_PERCPU|IRQF_NOBALANCING,
|
||||
callfunc_name,
|
||||
NULL);
|
||||
if (rc < 0)
|
||||
goto fail;
|
||||
per_cpu(xen_irq_work, cpu).irq = rc;
|
||||
per_cpu(xen_irq_work, cpu).name = callfunc_name;
|
||||
|
||||
if (is_xen_pmu(cpu)) {
|
||||
pmu_name = kasprintf(GFP_KERNEL, "pmu%d", cpu);
|
||||
rc = bind_virq_to_irqhandler(VIRQ_XENPMU, cpu,
|
||||
xen_pmu_irq_handler,
|
||||
IRQF_PERCPU|IRQF_NOBALANCING,
|
||||
pmu_name, NULL);
|
||||
if (rc < 0)
|
||||
goto fail;
|
||||
per_cpu(xen_pmu_irq, cpu).irq = rc;
|
||||
per_cpu(xen_pmu_irq, cpu).name = pmu_name;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
fail:
|
||||
xen_smp_intr_free_pv(cpu);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static void __init xen_fill_possible_map(void)
|
||||
{
|
||||
int i, rc;
|
||||
|
||||
if (xen_initial_domain())
|
||||
return;
|
||||
|
||||
for (i = 0; i < nr_cpu_ids; i++) {
|
||||
rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
|
||||
if (rc >= 0) {
|
||||
num_processors++;
|
||||
set_cpu_possible(i, true);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void __init xen_filter_cpu_maps(void)
|
||||
{
|
||||
int i, rc;
|
||||
unsigned int subtract = 0;
|
||||
|
||||
if (!xen_initial_domain())
|
||||
return;
|
||||
|
||||
num_processors = 0;
|
||||
disabled_cpus = 0;
|
||||
for (i = 0; i < nr_cpu_ids; i++) {
|
||||
rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
|
||||
if (rc >= 0) {
|
||||
num_processors++;
|
||||
set_cpu_possible(i, true);
|
||||
} else {
|
||||
set_cpu_possible(i, false);
|
||||
set_cpu_present(i, false);
|
||||
subtract++;
|
||||
}
|
||||
}
|
||||
#ifdef CONFIG_HOTPLUG_CPU
|
||||
/* This is akin to using 'nr_cpus' on the Linux command line.
|
||||
* Which is OK as when we use 'dom0_max_vcpus=X' we can only
|
||||
* have up to X, while nr_cpu_ids is greater than X. This
|
||||
* normally is not a problem, except when CPU hotplugging
|
||||
* is involved and then there might be more than X CPUs
|
||||
* in the guest - which will not work as there is no
|
||||
* hypercall to expand the max number of VCPUs an already
|
||||
* running guest has. So cap it up to X. */
|
||||
if (subtract)
|
||||
nr_cpu_ids = nr_cpu_ids - subtract;
|
||||
#endif
|
||||
|
||||
}
|
||||
|
||||
static void __init xen_pv_smp_prepare_boot_cpu(void)
|
||||
{
|
||||
BUG_ON(smp_processor_id() != 0);
|
||||
native_smp_prepare_boot_cpu();
|
||||
|
||||
if (!xen_feature(XENFEAT_writable_page_tables))
|
||||
/* We've switched to the "real" per-cpu gdt, so make
|
||||
* sure the old memory can be recycled. */
|
||||
make_lowmem_page_readwrite(xen_initial_gdt);
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
/*
|
||||
* Xen starts us with XEN_FLAT_RING1_DS, but linux code
|
||||
* expects __USER_DS
|
||||
*/
|
||||
loadsegment(ds, __USER_DS);
|
||||
loadsegment(es, __USER_DS);
|
||||
#endif
|
||||
|
||||
xen_filter_cpu_maps();
|
||||
xen_setup_vcpu_info_placement();
|
||||
|
||||
/*
|
||||
* The alternative logic (which patches the unlock/lock) runs before
|
||||
* the smp bootup up code is activated. Hence we need to set this up
|
||||
* the core kernel is being patched. Otherwise we will have only
|
||||
* modules patched but not core code.
|
||||
*/
|
||||
xen_init_spinlocks();
|
||||
}
|
||||
|
||||
static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
|
||||
{
|
||||
unsigned cpu;
|
||||
unsigned int i;
|
||||
|
||||
if (skip_ioapic_setup) {
|
||||
char *m = (max_cpus == 0) ?
|
||||
"The nosmp parameter is incompatible with Xen; " \
|
||||
"use Xen dom0_max_vcpus=1 parameter" :
|
||||
"The noapic parameter is incompatible with Xen";
|
||||
|
||||
xen_raw_printk(m);
|
||||
panic(m);
|
||||
}
|
||||
xen_init_lock_cpu(0);
|
||||
|
||||
smp_store_boot_cpu_info();
|
||||
cpu_data(0).x86_max_cores = 1;
|
||||
|
||||
for_each_possible_cpu(i) {
|
||||
zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
|
||||
zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
|
||||
zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
|
||||
}
|
||||
set_cpu_sibling_map(0);
|
||||
|
||||
xen_pmu_init(0);
|
||||
|
||||
if (xen_smp_intr_init(0))
|
||||
BUG();
|
||||
|
||||
if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
|
||||
panic("could not allocate xen_cpu_initialized_map\n");
|
||||
|
||||
cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));
|
||||
|
||||
/* Restrict the possible_map according to max_cpus. */
|
||||
while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
|
||||
for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
|
||||
continue;
|
||||
set_cpu_possible(cpu, false);
|
||||
}
|
||||
|
||||
for_each_possible_cpu(cpu)
|
||||
set_cpu_present(cpu, true);
|
||||
}
|
||||
|
||||
static int
|
||||
cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
|
||||
{
|
||||
struct vcpu_guest_context *ctxt;
|
||||
struct desc_struct *gdt;
|
||||
unsigned long gdt_mfn;
|
||||
|
||||
/* used to tell cpu_init() that it can proceed with initialization */
|
||||
cpumask_set_cpu(cpu, cpu_callout_mask);
|
||||
if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
|
||||
return 0;
|
||||
|
||||
ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
|
||||
if (ctxt == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
gdt = get_cpu_gdt_rw(cpu);
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
ctxt->user_regs.fs = __KERNEL_PERCPU;
|
||||
ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
|
||||
#endif
|
||||
memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
|
||||
|
||||
ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
|
||||
ctxt->flags = VGCF_IN_KERNEL;
|
||||
ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
|
||||
ctxt->user_regs.ds = __USER_DS;
|
||||
ctxt->user_regs.es = __USER_DS;
|
||||
ctxt->user_regs.ss = __KERNEL_DS;
|
||||
|
||||
xen_copy_trap_info(ctxt->trap_ctxt);
|
||||
|
||||
ctxt->ldt_ents = 0;
|
||||
|
||||
BUG_ON((unsigned long)gdt & ~PAGE_MASK);
|
||||
|
||||
gdt_mfn = arbitrary_virt_to_mfn(gdt);
|
||||
make_lowmem_page_readonly(gdt);
|
||||
make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
|
||||
|
||||
ctxt->gdt_frames[0] = gdt_mfn;
|
||||
ctxt->gdt_ents = GDT_ENTRIES;
|
||||
|
||||
ctxt->kernel_ss = __KERNEL_DS;
|
||||
ctxt->kernel_sp = idle->thread.sp0;
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
ctxt->event_callback_cs = __KERNEL_CS;
|
||||
ctxt->failsafe_callback_cs = __KERNEL_CS;
|
||||
#else
|
||||
ctxt->gs_base_kernel = per_cpu_offset(cpu);
|
||||
#endif
|
||||
ctxt->event_callback_eip =
|
||||
(unsigned long)xen_hypervisor_callback;
|
||||
ctxt->failsafe_callback_eip =
|
||||
(unsigned long)xen_failsafe_callback;
|
||||
ctxt->user_regs.cs = __KERNEL_CS;
|
||||
per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
|
||||
|
||||
ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
|
||||
ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_gfn(swapper_pg_dir));
|
||||
if (HYPERVISOR_vcpu_op(VCPUOP_initialise, xen_vcpu_nr(cpu), ctxt))
|
||||
BUG();
|
||||
|
||||
kfree(ctxt);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int xen_cpu_up(unsigned int cpu, struct task_struct *idle)
|
||||
{
|
||||
int rc;
|
||||
|
||||
common_cpu_up(cpu, idle);
|
||||
|
||||
xen_setup_runstate_info(cpu);
|
||||
|
||||
/*
|
||||
* PV VCPUs are always successfully taken down (see 'while' loop
|
||||
* in xen_cpu_die()), so -EBUSY is an error.
|
||||
*/
|
||||
rc = cpu_check_up_prepare(cpu);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
/* make sure interrupts start blocked */
|
||||
per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;
|
||||
|
||||
rc = cpu_initialize_context(cpu, idle);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
xen_pmu_init(cpu);
|
||||
|
||||
rc = HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL);
|
||||
BUG_ON(rc);
|
||||
|
||||
while (cpu_report_state(cpu) != CPU_ONLINE)
|
||||
HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void xen_smp_cpus_done(unsigned int max_cpus)
|
||||
{
|
||||
}
|
||||
|
||||
#ifdef CONFIG_HOTPLUG_CPU
|
||||
static int xen_cpu_disable(void)
|
||||
{
|
||||
unsigned int cpu = smp_processor_id();
|
||||
if (cpu == 0)
|
||||
return -EBUSY;
|
||||
|
||||
cpu_disable_common();
|
||||
|
||||
load_cr3(swapper_pg_dir);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void xen_pv_cpu_die(unsigned int cpu)
|
||||
{
|
||||
while (HYPERVISOR_vcpu_op(VCPUOP_is_up,
|
||||
xen_vcpu_nr(cpu), NULL)) {
|
||||
__set_current_state(TASK_UNINTERRUPTIBLE);
|
||||
schedule_timeout(HZ/10);
|
||||
}
|
||||
|
||||
if (common_cpu_die(cpu) == 0) {
|
||||
xen_smp_intr_free(cpu);
|
||||
xen_uninit_lock_cpu(cpu);
|
||||
xen_teardown_timer(cpu);
|
||||
xen_pmu_finish(cpu);
|
||||
}
|
||||
}
|
||||
|
||||
static void xen_play_dead(void) /* used only with HOTPLUG_CPU */
|
||||
{
|
||||
play_dead_common();
|
||||
HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(smp_processor_id()), NULL);
|
||||
cpu_bringup();
|
||||
/*
|
||||
* commit 4b0c0f294 (tick: Cleanup NOHZ per cpu data on cpu down)
|
||||
* clears certain data that the cpu_idle loop (which called us
|
||||
* and that we return from) expects. The only way to get that
|
||||
* data back is to call:
|
||||
*/
|
||||
tick_nohz_idle_enter();
|
||||
|
||||
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
|
||||
}
|
||||
|
||||
#else /* !CONFIG_HOTPLUG_CPU */
|
||||
static int xen_cpu_disable(void)
|
||||
{
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
static void xen_pv_cpu_die(unsigned int cpu)
|
||||
{
|
||||
BUG();
|
||||
}
|
||||
|
||||
static void xen_play_dead(void)
|
||||
{
|
||||
BUG();
|
||||
}
|
||||
|
||||
#endif
|
||||
static void stop_self(void *v)
|
||||
{
|
||||
int cpu = smp_processor_id();
|
||||
|
||||
/* make sure we're not pinning something down */
|
||||
load_cr3(swapper_pg_dir);
|
||||
/* should set up a minimal gdt */
|
||||
|
||||
set_cpu_online(cpu, false);
|
||||
|
||||
HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL);
|
||||
BUG();
|
||||
}
|
||||
|
||||
static void xen_stop_other_cpus(int wait)
|
||||
{
|
||||
smp_call_function(stop_self, NULL, wait);
|
||||
}
|
||||
|
||||
static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
|
||||
{
|
||||
irq_enter();
|
||||
generic_smp_call_function_interrupt();
|
||||
inc_irq_stat(irq_call_count);
|
||||
irq_exit();
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
|
||||
{
|
||||
irq_enter();
|
||||
irq_work_run();
|
||||
inc_irq_stat(apic_irq_work_irqs);
|
||||
irq_exit();
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static const struct smp_ops xen_smp_ops __initconst = {
|
||||
.smp_prepare_boot_cpu = xen_pv_smp_prepare_boot_cpu,
|
||||
.smp_prepare_cpus = xen_smp_prepare_cpus,
|
||||
.smp_cpus_done = xen_smp_cpus_done,
|
||||
|
||||
.cpu_up = xen_cpu_up,
|
||||
.cpu_die = xen_pv_cpu_die,
|
||||
.cpu_disable = xen_cpu_disable,
|
||||
.play_dead = xen_play_dead,
|
||||
|
||||
.stop_other_cpus = xen_stop_other_cpus,
|
||||
.smp_send_reschedule = xen_smp_send_reschedule,
|
||||
|
||||
.send_call_func_ipi = xen_smp_send_call_function_ipi,
|
||||
.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
|
||||
};
|
||||
|
||||
void __init xen_smp_init(void)
|
||||
{
|
||||
smp_ops = xen_smp_ops;
|
||||
xen_fill_possible_map();
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user