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- // SPDX-License-Identifier: GPL-2.0-only
- #include <xen/xen.h>
- #include <xen/events.h>
- #include <xen/grant_table.h>
- #include <xen/hvm.h>
- #include <xen/interface/vcpu.h>
- #include <xen/interface/xen.h>
- #include <xen/interface/memory.h>
- #include <xen/interface/hvm/params.h>
- #include <xen/features.h>
- #include <xen/platform_pci.h>
- #include <xen/xenbus.h>
- #include <xen/page.h>
- #include <xen/interface/sched.h>
- #include <xen/xen-ops.h>
- #include <asm/xen/hypervisor.h>
- #include <asm/xen/hypercall.h>
- #include <asm/system_misc.h>
- #include <asm/efi.h>
- #include <linux/interrupt.h>
- #include <linux/irqreturn.h>
- #include <linux/module.h>
- #include <linux/of.h>
- #include <linux/of_fdt.h>
- #include <linux/of_irq.h>
- #include <linux/of_address.h>
- #include <linux/cpuidle.h>
- #include <linux/cpufreq.h>
- #include <linux/cpu.h>
- #include <linux/console.h>
- #include <linux/pvclock_gtod.h>
- #include <linux/reboot.h>
- #include <linux/time64.h>
- #include <linux/timekeeping.h>
- #include <linux/timekeeper_internal.h>
- #include <linux/acpi.h>
- #include <linux/virtio_anchor.h>
- #include <linux/mm.h>
- static struct start_info _xen_start_info;
- struct start_info *xen_start_info = &_xen_start_info;
- EXPORT_SYMBOL(xen_start_info);
- enum xen_domain_type xen_domain_type = XEN_NATIVE;
- EXPORT_SYMBOL(xen_domain_type);
- struct shared_info xen_dummy_shared_info;
- struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
- DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
- static struct vcpu_info __percpu *xen_vcpu_info;
- /* Linux <-> Xen vCPU id mapping */
- DEFINE_PER_CPU(uint32_t, xen_vcpu_id);
- EXPORT_PER_CPU_SYMBOL(xen_vcpu_id);
- /* These are unused until we support booting "pre-ballooned" */
- unsigned long xen_released_pages;
- struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
- static __read_mostly unsigned int xen_events_irq;
- static __read_mostly phys_addr_t xen_grant_frames;
- #define GRANT_TABLE_INDEX 0
- #define EXT_REGION_INDEX 1
- uint32_t xen_start_flags;
- EXPORT_SYMBOL(xen_start_flags);
- int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
- int nr, struct page **pages)
- {
- return xen_xlate_unmap_gfn_range(vma, nr, pages);
- }
- EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
- static void xen_read_wallclock(struct timespec64 *ts)
- {
- u32 version;
- struct timespec64 now, ts_monotonic;
- struct shared_info *s = HYPERVISOR_shared_info;
- struct pvclock_wall_clock *wall_clock = &(s->wc);
- /* get wallclock at system boot */
- do {
- version = wall_clock->version;
- rmb(); /* fetch version before time */
- now.tv_sec = ((uint64_t)wall_clock->sec_hi << 32) | wall_clock->sec;
- now.tv_nsec = wall_clock->nsec;
- rmb(); /* fetch time before checking version */
- } while ((wall_clock->version & 1) || (version != wall_clock->version));
- /* time since system boot */
- ktime_get_ts64(&ts_monotonic);
- *ts = timespec64_add(now, ts_monotonic);
- }
- static int xen_pvclock_gtod_notify(struct notifier_block *nb,
- unsigned long was_set, void *priv)
- {
- /* Protected by the calling core code serialization */
- static struct timespec64 next_sync;
- struct xen_platform_op op;
- struct timespec64 now, system_time;
- struct timekeeper *tk = priv;
- now.tv_sec = tk->xtime_sec;
- now.tv_nsec = (long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift);
- system_time = timespec64_add(now, tk->wall_to_monotonic);
- /*
- * We only take the expensive HV call when the clock was set
- * or when the 11 minutes RTC synchronization time elapsed.
- */
- if (!was_set && timespec64_compare(&now, &next_sync) < 0)
- return NOTIFY_OK;
- op.cmd = XENPF_settime64;
- op.u.settime64.mbz = 0;
- op.u.settime64.secs = now.tv_sec;
- op.u.settime64.nsecs = now.tv_nsec;
- op.u.settime64.system_time = timespec64_to_ns(&system_time);
- (void)HYPERVISOR_platform_op(&op);
- /*
- * Move the next drift compensation time 11 minutes
- * ahead. That's emulating the sync_cmos_clock() update for
- * the hardware RTC.
- */
- next_sync = now;
- next_sync.tv_sec += 11 * 60;
- return NOTIFY_OK;
- }
- static struct notifier_block xen_pvclock_gtod_notifier = {
- .notifier_call = xen_pvclock_gtod_notify,
- };
- static int xen_starting_cpu(unsigned int cpu)
- {
- struct vcpu_register_vcpu_info info;
- struct vcpu_info *vcpup;
- int err;
- /*
- * VCPUOP_register_vcpu_info cannot be called twice for the same
- * vcpu, so if vcpu_info is already registered, just get out. This
- * can happen with cpu-hotplug.
- */
- if (per_cpu(xen_vcpu, cpu) != NULL)
- goto after_register_vcpu_info;
- pr_info("Xen: initializing cpu%d\n", cpu);
- vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
- info.mfn = percpu_to_gfn(vcpup);
- info.offset = xen_offset_in_page(vcpup);
- err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu),
- &info);
- BUG_ON(err);
- per_cpu(xen_vcpu, cpu) = vcpup;
- if (!xen_kernel_unmapped_at_usr())
- xen_setup_runstate_info(cpu);
- after_register_vcpu_info:
- enable_percpu_irq(xen_events_irq, 0);
- return 0;
- }
- static int xen_dying_cpu(unsigned int cpu)
- {
- disable_percpu_irq(xen_events_irq);
- return 0;
- }
- void xen_reboot(int reason)
- {
- struct sched_shutdown r = { .reason = reason };
- int rc;
- rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
- BUG_ON(rc);
- }
- static int xen_restart(struct notifier_block *nb, unsigned long action,
- void *data)
- {
- xen_reboot(SHUTDOWN_reboot);
- return NOTIFY_DONE;
- }
- static struct notifier_block xen_restart_nb = {
- .notifier_call = xen_restart,
- .priority = 192,
- };
- static void xen_power_off(void)
- {
- xen_reboot(SHUTDOWN_poweroff);
- }
- static irqreturn_t xen_arm_callback(int irq, void *arg)
- {
- xen_evtchn_do_upcall();
- return IRQ_HANDLED;
- }
- static __initdata struct {
- const char *compat;
- const char *prefix;
- const char *version;
- bool found;
- } hyper_node = {"xen,xen", "xen,xen-", NULL, false};
- static int __init fdt_find_hyper_node(unsigned long node, const char *uname,
- int depth, void *data)
- {
- const void *s = NULL;
- int len;
- if (depth != 1 || strcmp(uname, "hypervisor") != 0)
- return 0;
- if (of_flat_dt_is_compatible(node, hyper_node.compat))
- hyper_node.found = true;
- s = of_get_flat_dt_prop(node, "compatible", &len);
- if (strlen(hyper_node.prefix) + 3 < len &&
- !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix)))
- hyper_node.version = s + strlen(hyper_node.prefix);
- /*
- * Check if Xen supports EFI by checking whether there is the
- * "/hypervisor/uefi" node in DT. If so, runtime services are available
- * through proxy functions (e.g. in case of Xen dom0 EFI implementation
- * they call special hypercall which executes relevant EFI functions)
- * and that is why they are always enabled.
- */
- if (IS_ENABLED(CONFIG_XEN_EFI)) {
- if ((of_get_flat_dt_subnode_by_name(node, "uefi") > 0) &&
- !efi_runtime_disabled())
- set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
- }
- return 0;
- }
- /*
- * see Documentation/devicetree/bindings/arm/xen.txt for the
- * documentation of the Xen Device Tree format.
- */
- void __init xen_early_init(void)
- {
- of_scan_flat_dt(fdt_find_hyper_node, NULL);
- if (!hyper_node.found) {
- pr_debug("No Xen support\n");
- return;
- }
- if (hyper_node.version == NULL) {
- pr_debug("Xen version not found\n");
- return;
- }
- pr_info("Xen %s support found\n", hyper_node.version);
- xen_domain_type = XEN_HVM_DOMAIN;
- xen_setup_features();
- if (xen_feature(XENFEAT_dom0))
- xen_start_flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
- if (!console_set_on_cmdline && !xen_initial_domain())
- add_preferred_console("hvc", 0, NULL);
- }
- static void __init xen_acpi_guest_init(void)
- {
- #ifdef CONFIG_ACPI
- struct xen_hvm_param a;
- int interrupt, trigger, polarity;
- a.domid = DOMID_SELF;
- a.index = HVM_PARAM_CALLBACK_IRQ;
- if (HYPERVISOR_hvm_op(HVMOP_get_param, &a)
- || (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) {
- xen_events_irq = 0;
- return;
- }
- interrupt = a.value & 0xff;
- trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE
- : ACPI_LEVEL_SENSITIVE;
- polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW
- : ACPI_ACTIVE_HIGH;
- xen_events_irq = acpi_register_gsi(NULL, interrupt, trigger, polarity);
- #endif
- }
- #ifdef CONFIG_XEN_UNPOPULATED_ALLOC
- /*
- * A type-less specific Xen resource which contains extended regions
- * (unused regions of guest physical address space provided by the hypervisor).
- */
- static struct resource xen_resource = {
- .name = "Xen unused space",
- };
- int __init arch_xen_unpopulated_init(struct resource **res)
- {
- struct device_node *np;
- struct resource *regs, *tmp_res;
- uint64_t min_gpaddr = -1, max_gpaddr = 0;
- unsigned int i, nr_reg = 0;
- int rc;
- if (!xen_domain())
- return -ENODEV;
- if (!acpi_disabled)
- return -ENODEV;
- np = of_find_compatible_node(NULL, NULL, "xen,xen");
- if (WARN_ON(!np))
- return -ENODEV;
- /* Skip region 0 which is reserved for grant table space */
- while (of_get_address(np, nr_reg + EXT_REGION_INDEX, NULL, NULL))
- nr_reg++;
- if (!nr_reg) {
- pr_err("No extended regions are found\n");
- of_node_put(np);
- return -EINVAL;
- }
- regs = kcalloc(nr_reg, sizeof(*regs), GFP_KERNEL);
- if (!regs) {
- of_node_put(np);
- return -ENOMEM;
- }
- /*
- * Create resource from extended regions provided by the hypervisor to be
- * used as unused address space for Xen scratch pages.
- */
- for (i = 0; i < nr_reg; i++) {
- rc = of_address_to_resource(np, i + EXT_REGION_INDEX, ®s[i]);
- if (rc)
- goto err;
- if (max_gpaddr < regs[i].end)
- max_gpaddr = regs[i].end;
- if (min_gpaddr > regs[i].start)
- min_gpaddr = regs[i].start;
- }
- xen_resource.start = min_gpaddr;
- xen_resource.end = max_gpaddr;
- /*
- * Mark holes between extended regions as unavailable. The rest of that
- * address space will be available for the allocation.
- */
- for (i = 1; i < nr_reg; i++) {
- resource_size_t start, end;
- /* There is an overlap between regions */
- if (regs[i - 1].end + 1 > regs[i].start) {
- rc = -EINVAL;
- goto err;
- }
- /* There is no hole between regions */
- if (regs[i - 1].end + 1 == regs[i].start)
- continue;
- start = regs[i - 1].end + 1;
- end = regs[i].start - 1;
- tmp_res = kzalloc(sizeof(*tmp_res), GFP_KERNEL);
- if (!tmp_res) {
- rc = -ENOMEM;
- goto err;
- }
- tmp_res->name = "Unavailable space";
- tmp_res->start = start;
- tmp_res->end = end;
- rc = insert_resource(&xen_resource, tmp_res);
- if (rc) {
- pr_err("Cannot insert resource %pR (%d)\n", tmp_res, rc);
- kfree(tmp_res);
- goto err;
- }
- }
- *res = &xen_resource;
- err:
- of_node_put(np);
- kfree(regs);
- return rc;
- }
- #endif
- static void __init xen_dt_guest_init(void)
- {
- struct device_node *xen_node;
- struct resource res;
- xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
- if (!xen_node) {
- pr_err("Xen support was detected before, but it has disappeared\n");
- return;
- }
- xen_events_irq = irq_of_parse_and_map(xen_node, 0);
- if (of_address_to_resource(xen_node, GRANT_TABLE_INDEX, &res)) {
- pr_err("Xen grant table region is not found\n");
- of_node_put(xen_node);
- return;
- }
- of_node_put(xen_node);
- xen_grant_frames = res.start;
- }
- static int __init xen_guest_init(void)
- {
- struct xen_add_to_physmap xatp;
- struct shared_info *shared_info_page = NULL;
- int rc, cpu;
- if (!xen_domain())
- return 0;
- if (IS_ENABLED(CONFIG_XEN_VIRTIO))
- virtio_set_mem_acc_cb(xen_virtio_mem_acc);
- if (!acpi_disabled)
- xen_acpi_guest_init();
- else
- xen_dt_guest_init();
- if (!xen_events_irq) {
- pr_err("Xen event channel interrupt not found\n");
- return -ENODEV;
- }
- /*
- * The fdt parsing codes have set EFI_RUNTIME_SERVICES if Xen EFI
- * parameters are found. Force enable runtime services.
- */
- if (efi_enabled(EFI_RUNTIME_SERVICES))
- xen_efi_runtime_setup();
- shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
- if (!shared_info_page) {
- pr_err("not enough memory\n");
- return -ENOMEM;
- }
- xatp.domid = DOMID_SELF;
- xatp.idx = 0;
- xatp.space = XENMAPSPACE_shared_info;
- xatp.gpfn = virt_to_gfn(shared_info_page);
- if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
- 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.
- * The shared info contains exactly 1 CPU (the boot CPU). The guest
- * is required to use VCPUOP_register_vcpu_info to place vcpu info
- * for secondary CPUs as they are brought up.
- * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
- */
- xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
- 1 << fls(sizeof(struct vcpu_info) - 1));
- if (xen_vcpu_info == NULL)
- return -ENOMEM;
- /* Direct vCPU id mapping for ARM guests. */
- for_each_possible_cpu(cpu)
- per_cpu(xen_vcpu_id, cpu) = cpu;
- if (!xen_grant_frames) {
- xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
- rc = xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,
- &xen_auto_xlat_grant_frames.vaddr,
- xen_auto_xlat_grant_frames.count);
- } else
- rc = gnttab_setup_auto_xlat_frames(xen_grant_frames);
- if (rc) {
- free_percpu(xen_vcpu_info);
- return rc;
- }
- gnttab_init();
- /*
- * Making sure board specific code will not set up ops for
- * cpu idle and cpu freq.
- */
- disable_cpuidle();
- disable_cpufreq();
- xen_init_IRQ();
- if (request_percpu_irq(xen_events_irq, xen_arm_callback,
- "events", &xen_vcpu)) {
- pr_err("Error request IRQ %d\n", xen_events_irq);
- return -EINVAL;
- }
- if (!xen_kernel_unmapped_at_usr())
- xen_time_setup_guest();
- if (xen_initial_domain())
- pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
- return cpuhp_setup_state(CPUHP_AP_ARM_XEN_STARTING,
- "arm/xen:starting", xen_starting_cpu,
- xen_dying_cpu);
- }
- early_initcall(xen_guest_init);
- static int __init xen_pm_init(void)
- {
- if (!xen_domain())
- return -ENODEV;
- pm_power_off = xen_power_off;
- register_restart_handler(&xen_restart_nb);
- if (!xen_initial_domain()) {
- struct timespec64 ts;
- xen_read_wallclock(&ts);
- do_settimeofday64(&ts);
- }
- return 0;
- }
- late_initcall(xen_pm_init);
- /* empty stubs */
- void xen_arch_pre_suspend(void) { }
- void xen_arch_post_suspend(int suspend_cancelled) { }
- void xen_timer_resume(void) { }
- void xen_arch_resume(void) { }
- void xen_arch_suspend(void) { }
- /* In the hypercall.S file. */
- EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
- EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
- EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
- EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
- EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
- EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
- EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
- EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
- EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
- EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op_raw);
- EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
- EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
- EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);
- EXPORT_SYMBOL_GPL(privcmd_call);
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