arch/x86/xen/enlighten_pvh.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/acpi.h>
   3 #include <linux/export.h>
   4
   5 #include <xen/hvc-console.h>
   6
   7 #include <asm/bootparam.h>
   8 #include <asm/io_apic.h>
   9 #include <asm/hypervisor.h>
  10 #include <asm/e820/api.h>
  11
  12 #include <xen/xen.h>
  13 #include <asm/xen/interface.h>
  14 #include <asm/xen/hypercall.h>
  15
  16 #include <xen/interface/memory.h>
  17
  18 #include "xen-ops.h"
  19
  20 /*
  21  * PVH variables.
  22  *
  23  * The variable xen_pvh needs to live in a data segment since it is used
  24  * after startup_{32|64} is invoked, which will clear the .bss segment.
  25  */
  26 bool __ro_after_init xen_pvh;
  27 EXPORT_SYMBOL_GPL(xen_pvh);
  28
  29 void __init xen_pvh_init(struct boot_params *boot_params)
  30 {
  31         u32 msr;
  32         u64 pfn;
  33
  34         xen_pvh = 1;
  35         xen_domain_type = XEN_HVM_DOMAIN;
  36         xen_start_flags = pvh_start_info.flags;
  37
  38         msr = cpuid_ebx(xen_cpuid_base() + 2);
  39         pfn = __pa(hypercall_page);
  40         wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
  41
  42         if (xen_initial_domain())
  43                 x86_init.oem.arch_setup = xen_add_preferred_consoles;
  44         x86_init.oem.banner = xen_banner;
  45
  46         xen_efi_init(boot_params);
  47
  48         if (xen_initial_domain()) {
  49                 struct xen_platform_op op = {
  50                         .cmd = XENPF_get_dom0_console,
  51                 };
  52                 int ret = HYPERVISOR_platform_op(&op);
  53
  54                 if (ret > 0)
  55                         xen_init_vga(&op.u.dom0_console,
  56                                      min(ret * sizeof(char),
  57                                          sizeof(op.u.dom0_console)),
  58                                      &boot_params->screen_info);
  59         }
  60 }
  61
  62 void __init mem_map_via_hcall(struct boot_params *boot_params_p)
  63 {
  64         struct xen_memory_map memmap;
  65         int rc;
  66
  67         memmap.nr_entries = ARRAY_SIZE(boot_params_p->e820_table);
  68         set_xen_guest_handle(memmap.buffer, boot_params_p->e820_table);
  69         rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
  70         if (rc) {
  71                 xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc);
  72                 BUG();
  73         }
  74         boot_params_p->e820_entries = memmap.nr_entries;
  75 }