169 строки
4.6 KiB
C
169 строки
4.6 KiB
C
#include <xen/xen.h>
|
|
#include <xen/events.h>
|
|
#include <xen/grant_table.h>
|
|
#include <xen/hvm.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 <asm/xen/hypervisor.h>
|
|
#include <asm/xen/hypercall.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irqreturn.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_irq.h>
|
|
#include <linux/of_address.h>
|
|
|
|
struct start_info _xen_start_info;
|
|
struct start_info *xen_start_info = &_xen_start_info;
|
|
EXPORT_SYMBOL_GPL(xen_start_info);
|
|
|
|
enum xen_domain_type xen_domain_type = XEN_NATIVE;
|
|
EXPORT_SYMBOL_GPL(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);
|
|
|
|
/* TODO: to be removed */
|
|
__read_mostly int xen_have_vector_callback;
|
|
EXPORT_SYMBOL_GPL(xen_have_vector_callback);
|
|
|
|
int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
|
|
EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
|
|
|
|
static __read_mostly int xen_events_irq = -1;
|
|
|
|
int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
|
|
unsigned long addr,
|
|
unsigned long mfn, int nr,
|
|
pgprot_t prot, unsigned domid)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
|
|
|
|
/*
|
|
* see Documentation/devicetree/bindings/arm/xen.txt for the
|
|
* documentation of the Xen Device Tree format.
|
|
*/
|
|
#define GRANT_TABLE_PHYSADDR 0
|
|
static int __init xen_guest_init(void)
|
|
{
|
|
struct xen_add_to_physmap xatp;
|
|
static struct shared_info *shared_info_page = 0;
|
|
struct device_node *node;
|
|
int len;
|
|
const char *s = NULL;
|
|
const char *version = NULL;
|
|
const char *xen_prefix = "xen,xen-";
|
|
struct resource res;
|
|
|
|
node = of_find_compatible_node(NULL, NULL, "xen,xen");
|
|
if (!node) {
|
|
pr_debug("No Xen support\n");
|
|
return 0;
|
|
}
|
|
s = of_get_property(node, "compatible", &len);
|
|
if (strlen(xen_prefix) + 3 < len &&
|
|
!strncmp(xen_prefix, s, strlen(xen_prefix)))
|
|
version = s + strlen(xen_prefix);
|
|
if (version == NULL) {
|
|
pr_debug("Xen version not found\n");
|
|
return 0;
|
|
}
|
|
if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
|
|
return 0;
|
|
xen_hvm_resume_frames = res.start >> PAGE_SHIFT;
|
|
xen_events_irq = irq_of_parse_and_map(node, 0);
|
|
pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n",
|
|
version, xen_events_irq, xen_hvm_resume_frames);
|
|
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 (!shared_info_page)
|
|
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 = __pa(shared_info_page) >> PAGE_SHIFT;
|
|
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. We don't need the vcpu_info placement
|
|
* optimizations because we don't use any pv_mmu or pv_irq op on
|
|
* HVM.
|
|
* 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. */
|
|
per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
|
|
|
|
gnttab_init();
|
|
if (!xen_initial_domain())
|
|
xenbus_probe(NULL);
|
|
|
|
return 0;
|
|
}
|
|
core_initcall(xen_guest_init);
|
|
|
|
static irqreturn_t xen_arm_callback(int irq, void *arg)
|
|
{
|
|
xen_hvm_evtchn_do_upcall();
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int __init xen_init_events(void)
|
|
{
|
|
if (!xen_domain() || xen_events_irq < 0)
|
|
return -ENODEV;
|
|
|
|
xen_init_IRQ();
|
|
|
|
if (request_percpu_irq(xen_events_irq, xen_arm_callback,
|
|
"events", xen_vcpu)) {
|
|
pr_err("Error requesting IRQ %d\n", xen_events_irq);
|
|
return -EINVAL;
|
|
}
|
|
|
|
enable_percpu_irq(xen_events_irq, 0);
|
|
|
|
return 0;
|
|
}
|
|
postcore_initcall(xen_init_events);
|
|
|
|
/* XXX: only until balloon is properly working */
|
|
int alloc_xenballooned_pages(int nr_pages, struct page **pages, bool highmem)
|
|
{
|
|
*pages = alloc_pages(highmem ? GFP_HIGHUSER : GFP_KERNEL,
|
|
get_order(nr_pages));
|
|
if (*pages == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(alloc_xenballooned_pages);
|
|
|
|
void free_xenballooned_pages(int nr_pages, struct page **pages)
|
|
{
|
|
kfree(*pages);
|
|
*pages = NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(free_xenballooned_pages);
|