466 lines
12 KiB
C
466 lines
12 KiB
C
#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/xen/xen-ops.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/time64.h>
|
|
#include <linux/timekeeping.h>
|
|
#include <linux/timekeeper_internal.h>
|
|
#include <linux/acpi.h>
|
|
|
|
#include <linux/mm.h>
|
|
|
|
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;
|
|
|
|
int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
|
|
unsigned long addr,
|
|
xen_pfn_t *gfn, int nr,
|
|
int *err_ptr, pgprot_t prot,
|
|
unsigned domid,
|
|
struct page **pages)
|
|
{
|
|
return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr,
|
|
prot, domid, pages);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_array);
|
|
|
|
/* Not used by XENFEAT_auto_translated guests. */
|
|
int xen_remap_domain_gfn_range(struct vm_area_struct *vma,
|
|
unsigned long addr,
|
|
xen_pfn_t gfn, int nr,
|
|
pgprot_t prot, unsigned domid,
|
|
struct page **pages)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_range);
|
|
|
|
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 = virt_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;
|
|
|
|
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 void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
|
|
{
|
|
xen_reboot(SHUTDOWN_reboot);
|
|
}
|
|
|
|
|
|
static void xen_power_off(void)
|
|
{
|
|
xen_reboot(SHUTDOWN_poweroff);
|
|
}
|
|
|
|
static irqreturn_t xen_arm_callback(int irq, void *arg)
|
|
{
|
|
xen_hvm_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.
|
|
*/
|
|
#define GRANT_TABLE_PHYSADDR 0
|
|
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_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
|
|
else
|
|
xen_start_info->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
|
|
}
|
|
|
|
static void __init xen_dt_guest_init(void)
|
|
{
|
|
struct device_node *xen_node;
|
|
|
|
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);
|
|
}
|
|
|
|
static int __init xen_guest_init(void)
|
|
{
|
|
struct xen_add_to_physmap xatp;
|
|
struct shared_info *shared_info_page = NULL;
|
|
int cpu;
|
|
|
|
if (!xen_domain())
|
|
return 0;
|
|
|
|
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(struct vcpu_info);
|
|
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;
|
|
|
|
xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
|
|
if (xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,
|
|
&xen_auto_xlat_grant_frames.vaddr,
|
|
xen_auto_xlat_grant_frames.count)) {
|
|
free_percpu(xen_vcpu_info);
|
|
return -ENOMEM;
|
|
}
|
|
gnttab_init();
|
|
if (!xen_initial_domain())
|
|
xenbus_probe(NULL);
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
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;
|
|
arm_pm_restart = xen_restart;
|
|
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_tmem_op);
|
|
EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op);
|
|
EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
|
|
EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
|
|
EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);
|
|
EXPORT_SYMBOL_GPL(privcmd_call);
|