arch/x86/xen/enlighten_pvh.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/acpi.h>
   3
   4 #include <xen/hvc-console.h>
   5
   6 #include <asm/io_apic.h>
   7 #include <asm/hypervisor.h>
   8 #include <asm/e820/api.h>
   9
  10 #include <xen/xen.h>
  11 #include <asm/xen/interface.h>
  12 #include <asm/xen/hypercall.h>
  13
  14 #include <xen/interface/memory.h>
  15
  16 #include "xen-ops.h"
  17
  18 /*
  19  * PVH variables.
  20  *
  21  * The variable xen_pvh needs to live in the data segment since it is used
  22  * after startup_{32|64} is invoked, which will clear the .bss segment.
  23  */
  24 bool xen_pvh __attribute__((section(".data"))) = 0;
  25
  26 void __init xen_pvh_init(struct boot_params *boot_params)
  27 {
  28         u32 msr;
  29         u64 pfn;
  30
  31         xen_pvh = 1;
  32         xen_domain_type = XEN_HVM_DOMAIN;
  33         xen_start_flags = pvh_start_info.flags;
  34
  35         msr = cpuid_ebx(xen_cpuid_base() + 2);
  36         pfn = __pa(hypercall_page);
  37         wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
  38
  39         xen_efi_init(boot_params);
  40 }
  41
  42 void __init mem_map_via_hcall(struct boot_params *boot_params_p)
  43 {
  44         struct xen_memory_map memmap;
  45         int rc;
  46
  47         memmap.nr_entries = ARRAY_SIZE(boot_params_p->e820_table);
  48         set_xen_guest_handle(memmap.buffer, boot_params_p->e820_table);
  49         rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
  50         if (rc) {
  51                 xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc);
  52                 BUG();
  53         }
  54         boot_params_p->e820_entries = memmap.nr_entries;
  55 }