Contributors: 31
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Juergen Gross |
317 |
20.43% |
10 |
11.11% |
| Vitaly Kuznetsov |
253 |
16.30% |
7 |
7.78% |
| Jeremy Fitzhardinge |
235 |
15.14% |
20 |
22.22% |
| Boris Ostrovsky |
142 |
9.15% |
6 |
6.67% |
| Roger Pau Monné |
101 |
6.51% |
4 |
4.44% |
| Ankur Arora |
92 |
5.93% |
2 |
2.22% |
| David Vrabel |
81 |
5.22% |
2 |
2.22% |
| Liu Jinsong |
77 |
4.96% |
1 |
1.11% |
| Jan Beulich |
55 |
3.54% |
8 |
8.89% |
| Stefano Stabellini |
46 |
2.96% |
2 |
2.22% |
| Konrad Rzeszutek Wilk |
25 |
1.61% |
4 |
4.44% |
| Markus Armbruster |
24 |
1.55% |
2 |
2.22% |
| Ian Campbell |
22 |
1.42% |
1 |
1.11% |
| Donald Dutile |
18 |
1.16% |
1 |
1.11% |
| Sheng Yang |
13 |
0.84% |
2 |
2.22% |
| Miroslav Rezanina |
8 |
0.52% |
1 |
1.11% |
| Petr Tesarik |
6 |
0.39% |
1 |
1.11% |
| Wei Liu |
5 |
0.32% |
1 |
1.11% |
| Radim Krčmář |
5 |
0.32% |
1 |
1.11% |
| Olaf Hering |
5 |
0.32% |
1 |
1.11% |
| Jane Malalane |
3 |
0.19% |
1 |
1.11% |
| Luis R. Rodriguez |
3 |
0.19% |
2 |
2.22% |
| Mukesh Rathor |
3 |
0.19% |
2 |
2.22% |
| Andy Shevchenko |
3 |
0.19% |
1 |
1.11% |
| H. Peter Anvin |
2 |
0.13% |
1 |
1.11% |
| Duan Zhenzhong |
2 |
0.13% |
1 |
1.11% |
| Linus Torvalds (pre-git) |
2 |
0.13% |
1 |
1.11% |
| Mike Rapoport |
1 |
0.06% |
1 |
1.11% |
| Linus Torvalds |
1 |
0.06% |
1 |
1.11% |
| Daniel Kiper |
1 |
0.06% |
1 |
1.11% |
| Tejun Heo |
1 |
0.06% |
1 |
1.11% |
| Total |
1552 |
|
90 |
|
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// SPDX-License-Identifier: GPL-2.0
#include <linux/console.h>
#include <linux/cpu.h>
#include <linux/instrumentation.h>
#include <linux/kexec.h>
#include <linux/memblock.h>
#include <linux/slab.h>
#include <linux/panic_notifier.h>
#include <xen/xen.h>
#include <xen/features.h>
#include <xen/interface/sched.h>
#include <xen/interface/version.h>
#include <xen/page.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>
#include <asm/cpu.h>
#include <asm/e820/api.h>
#include <asm/setup.h>
#include "xen-ops.h"
DEFINE_STATIC_CALL(xen_hypercall, xen_hypercall_hvm);
EXPORT_STATIC_CALL_TRAMP(xen_hypercall);
/*
* Pointer to the xen_vcpu_info structure or
* &HYPERVISOR_shared_info->vcpu_info[cpu]. See xen_hvm_init_shared_info
* and xen_vcpu_setup for details. By default it points to share_info->vcpu_info
* but during boot it is switched to point to xen_vcpu_info.
* The pointer is used in xen_evtchn_do_upcall to acknowledge pending events.
* Make sure that xen_vcpu_info doesn't cross a page boundary by making it
* cache-line aligned (the struct is guaranteed to have a size of 64 bytes,
* which matches the cache line size of 64-bit x86 processors).
*/
DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
DEFINE_PER_CPU_ALIGNED(struct vcpu_info, xen_vcpu_info);
/* Linux <-> Xen vCPU id mapping */
DEFINE_PER_CPU(uint32_t, xen_vcpu_id);
EXPORT_PER_CPU_SYMBOL(xen_vcpu_id);
unsigned long *machine_to_phys_mapping = (void *)MACH2PHYS_VIRT_START;
EXPORT_SYMBOL(machine_to_phys_mapping);
unsigned long machine_to_phys_nr;
EXPORT_SYMBOL(machine_to_phys_nr);
struct start_info *xen_start_info;
EXPORT_SYMBOL_GPL(xen_start_info);
struct shared_info xen_dummy_shared_info;
__read_mostly bool xen_have_vector_callback = true;
EXPORT_SYMBOL_GPL(xen_have_vector_callback);
/*
* NB: These need to live in .data or alike because they're used by
* xen_prepare_pvh() which runs before clearing the bss.
*/
enum xen_domain_type __ro_after_init xen_domain_type = XEN_NATIVE;
EXPORT_SYMBOL_GPL(xen_domain_type);
uint32_t __ro_after_init xen_start_flags;
EXPORT_SYMBOL(xen_start_flags);
/*
* Point at some empty memory to start with. We map the real shared_info
* page as soon as fixmap is up and running.
*/
struct shared_info *HYPERVISOR_shared_info = &xen_dummy_shared_info;
static __ref void xen_get_vendor(void)
{
init_cpu_devs();
cpu_detect(&boot_cpu_data);
get_cpu_vendor(&boot_cpu_data);
}
void xen_hypercall_setfunc(void)
{
if (static_call_query(xen_hypercall) != xen_hypercall_hvm)
return;
if ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
boot_cpu_data.x86_vendor == X86_VENDOR_HYGON))
static_call_update(xen_hypercall, xen_hypercall_amd);
else
static_call_update(xen_hypercall, xen_hypercall_intel);
}
/*
* Evaluate processor vendor in order to select the correct hypercall
* function for HVM/PVH guests.
* Might be called very early in boot before vendor has been set by
* early_cpu_init().
*/
noinstr void *__xen_hypercall_setfunc(void)
{
void (*func)(void);
/*
* Xen is supported only on CPUs with CPUID, so testing for
* X86_FEATURE_CPUID is a test for early_cpu_init() having been
* run.
*
* Note that __xen_hypercall_setfunc() is noinstr only due to a nasty
* dependency chain: it is being called via the xen_hypercall static
* call when running as a PVH or HVM guest. Hypercalls need to be
* noinstr due to PV guests using hypercalls in noinstr code. So we
* can safely tag the function body as "instrumentation ok", since
* the PV guest requirement is not of interest here (xen_get_vendor()
* calls noinstr functions, and static_call_update_early() might do
* so, too).
*/
instrumentation_begin();
if (!boot_cpu_has(X86_FEATURE_CPUID))
xen_get_vendor();
if ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
boot_cpu_data.x86_vendor == X86_VENDOR_HYGON))
func = xen_hypercall_amd;
else
func = xen_hypercall_intel;
static_call_update_early(xen_hypercall, func);
instrumentation_end();
return func;
}
static int xen_cpu_up_online(unsigned int cpu)
{
xen_init_lock_cpu(cpu);
return 0;
}
int xen_cpuhp_setup(int (*cpu_up_prepare_cb)(unsigned int),
int (*cpu_dead_cb)(unsigned int))
{
int rc;
rc = cpuhp_setup_state_nocalls(CPUHP_XEN_PREPARE,
"x86/xen/guest:prepare",
cpu_up_prepare_cb, cpu_dead_cb);
if (rc >= 0) {
rc = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
"x86/xen/guest:online",
xen_cpu_up_online, NULL);
if (rc < 0)
cpuhp_remove_state_nocalls(CPUHP_XEN_PREPARE);
}
return rc >= 0 ? 0 : rc;
}
static void xen_vcpu_setup_restore(int cpu)
{
/* Any per_cpu(xen_vcpu) is stale, so reset it */
xen_vcpu_info_reset(cpu);
/*
* For PVH and PVHVM, setup online VCPUs only. The rest will
* be handled by hotplug.
*/
if (xen_pv_domain() ||
(xen_hvm_domain() && cpu_online(cpu)))
xen_vcpu_setup(cpu);
}
/*
* On restore, set the vcpu placement up again.
* If it fails, then we're in a bad state, since
* we can't back out from using it...
*/
void xen_vcpu_restore(void)
{
int cpu;
for_each_possible_cpu(cpu) {
bool other_cpu = (cpu != smp_processor_id());
bool is_up;
if (xen_vcpu_nr(cpu) == XEN_VCPU_ID_INVALID)
continue;
/* Only Xen 4.5 and higher support this. */
is_up = HYPERVISOR_vcpu_op(VCPUOP_is_up,
xen_vcpu_nr(cpu), NULL) > 0;
if (other_cpu && is_up &&
HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL))
BUG();
if (xen_pv_domain() || xen_feature(XENFEAT_hvm_safe_pvclock))
xen_setup_runstate_info(cpu);
xen_vcpu_setup_restore(cpu);
if (other_cpu && is_up &&
HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL))
BUG();
}
}
void xen_vcpu_info_reset(int cpu)
{
if (xen_vcpu_nr(cpu) < MAX_VIRT_CPUS) {
per_cpu(xen_vcpu, cpu) =
&HYPERVISOR_shared_info->vcpu_info[xen_vcpu_nr(cpu)];
} else {
/* Set to NULL so that if somebody accesses it we get an OOPS */
per_cpu(xen_vcpu, cpu) = NULL;
}
}
void xen_vcpu_setup(int cpu)
{
struct vcpu_register_vcpu_info info;
int err;
struct vcpu_info *vcpup;
BUILD_BUG_ON(sizeof(*vcpup) > SMP_CACHE_BYTES);
BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info);
/*
* This path is called on PVHVM at bootup (xen_hvm_smp_prepare_boot_cpu)
* and at restore (xen_vcpu_restore). Also called for hotplugged
* VCPUs (cpu_init -> xen_hvm_cpu_prepare_hvm).
* However, the hypercall can only be done once (see below) so if a VCPU
* is offlined and comes back online then let's not redo the hypercall.
*
* For PV it is called during restore (xen_vcpu_restore) and bootup
* (xen_setup_vcpu_info_placement). The hotplug mechanism does not
* use this function.
*/
if (xen_hvm_domain()) {
if (per_cpu(xen_vcpu, cpu) == &per_cpu(xen_vcpu_info, cpu))
return;
}
vcpup = &per_cpu(xen_vcpu_info, cpu);
info.mfn = arbitrary_virt_to_mfn(vcpup);
info.offset = offset_in_page(vcpup);
/*
* N.B. This hypercall can _only_ be called once per CPU.
* Subsequent calls will error out with -EINVAL. This is due to
* the fact that hypervisor has no unregister variant and this
* hypercall does not allow to over-write info.mfn and
* info.offset.
*/
err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu),
&info);
if (err)
panic("register_vcpu_info failed: cpu=%d err=%d\n", cpu, err);
per_cpu(xen_vcpu, cpu) = vcpup;
}
void __init xen_banner(void)
{
unsigned version = HYPERVISOR_xen_version(XENVER_version, NULL);
struct xen_extraversion extra;
HYPERVISOR_xen_version(XENVER_extraversion, &extra);
pr_info("Booting kernel on %s\n", pv_info.name);
pr_info("Xen version: %u.%u%s%s\n",
version >> 16, version & 0xffff, extra.extraversion,
xen_feature(XENFEAT_mmu_pt_update_preserve_ad)
? " (preserve-AD)" : "");
}
/* Check if running on Xen version (major, minor) or later */
bool xen_running_on_version_or_later(unsigned int major, unsigned int minor)
{
unsigned int version;
if (!xen_domain())
return false;
version = HYPERVISOR_xen_version(XENVER_version, NULL);
if ((((version >> 16) == major) && ((version & 0xffff) >= minor)) ||
((version >> 16) > major))
return true;
return false;
}
void __init xen_add_preferred_consoles(void)
{
add_preferred_console("xenboot", 0, NULL);
if (!boot_params.screen_info.orig_video_isVGA)
add_preferred_console("tty", 0, NULL);
add_preferred_console("hvc", 0, NULL);
if (boot_params.screen_info.orig_video_isVGA)
add_preferred_console("tty", 0, NULL);
}
void xen_reboot(int reason)
{
struct sched_shutdown r = { .reason = reason };
int cpu;
for_each_online_cpu(cpu)
xen_pmu_finish(cpu);
if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r))
BUG();
}
static int reboot_reason = SHUTDOWN_reboot;
static bool xen_legacy_crash;
void xen_emergency_restart(void)
{
xen_reboot(reboot_reason);
}
static int
xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
{
if (!kexec_crash_loaded()) {
if (xen_legacy_crash)
xen_reboot(SHUTDOWN_crash);
reboot_reason = SHUTDOWN_crash;
/*
* If panic_timeout==0 then we are supposed to wait forever.
* However, to preserve original dom0 behavior we have to drop
* into hypervisor. (domU behavior is controlled by its
* config file)
*/
if (panic_timeout == 0)
panic_timeout = -1;
}
return NOTIFY_DONE;
}
static int __init parse_xen_legacy_crash(char *arg)
{
xen_legacy_crash = true;
return 0;
}
early_param("xen_legacy_crash", parse_xen_legacy_crash);
static struct notifier_block xen_panic_block = {
.notifier_call = xen_panic_event,
.priority = INT_MIN
};
int xen_panic_handler_init(void)
{
atomic_notifier_chain_register(&panic_notifier_list, &xen_panic_block);
return 0;
}
void xen_pin_vcpu(int cpu)
{
static bool disable_pinning;
struct sched_pin_override pin_override;
int ret;
if (disable_pinning)
return;
pin_override.pcpu = cpu;
ret = HYPERVISOR_sched_op(SCHEDOP_pin_override, &pin_override);
/* Ignore errors when removing override. */
if (cpu < 0)
return;
switch (ret) {
case -ENOSYS:
pr_warn("Unable to pin on physical cpu %d. In case of problems consider vcpu pinning.\n",
cpu);
disable_pinning = true;
break;
case -EPERM:
WARN(1, "Trying to pin vcpu without having privilege to do so\n");
disable_pinning = true;
break;
case -EINVAL:
case -EBUSY:
pr_warn("Physical cpu %d not available for pinning. Check Xen cpu configuration.\n",
cpu);
break;
case 0:
break;
default:
WARN(1, "rc %d while trying to pin vcpu\n", ret);
disable_pinning = true;
}
}
#ifdef CONFIG_HOTPLUG_CPU
void xen_arch_register_cpu(int num)
{
arch_register_cpu(num);
}
EXPORT_SYMBOL(xen_arch_register_cpu);
void xen_arch_unregister_cpu(int num)
{
arch_unregister_cpu(num);
}
EXPORT_SYMBOL(xen_arch_unregister_cpu);
#endif
/* Amount of extra memory space we add to the e820 ranges */
struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
void __init xen_add_extra_mem(unsigned long start_pfn, unsigned long n_pfns)
{
unsigned int i;
/*
* No need to check for zero size, should happen rarely and will only
* write a new entry regarded to be unused due to zero size.
*/
for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
/* Add new region. */
if (xen_extra_mem[i].n_pfns == 0) {
xen_extra_mem[i].start_pfn = start_pfn;
xen_extra_mem[i].n_pfns = n_pfns;
break;
}
/* Append to existing region. */
if (xen_extra_mem[i].start_pfn + xen_extra_mem[i].n_pfns ==
start_pfn) {
xen_extra_mem[i].n_pfns += n_pfns;
break;
}
}
if (i == XEN_EXTRA_MEM_MAX_REGIONS)
printk(KERN_WARNING "Warning: not enough extra memory regions\n");
memblock_reserve(PFN_PHYS(start_pfn), PFN_PHYS(n_pfns));
}
#ifdef CONFIG_XEN_UNPOPULATED_ALLOC
int __init arch_xen_unpopulated_init(struct resource **res)
{
unsigned int i;
if (!xen_domain())
return -ENODEV;
/* Must be set strictly before calling xen_free_unpopulated_pages(). */
*res = &iomem_resource;
/*
* Initialize with pages from the extra memory regions (see
* arch/x86/xen/setup.c).
*/
for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
unsigned int j;
for (j = 0; j < xen_extra_mem[i].n_pfns; j++) {
struct page *pg =
pfn_to_page(xen_extra_mem[i].start_pfn + j);
xen_free_unpopulated_pages(1, &pg);
}
/* Zero so region is not also added to the balloon driver. */
xen_extra_mem[i].n_pfns = 0;
}
return 0;
}
#endif