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