arch/s390/boot/uv.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <asm/uv.h>
   3 #include <asm/boot_data.h>
   4 #include <asm/facility.h>
   5 #include <asm/sections.h>
   6
   7 #include "boot.h"
   8 #include "uv.h"
   9
  10 /* will be used in arch/s390/kernel/uv.c */
  11 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
  12 int __bootdata_preserved(prot_virt_guest);
  13 #endif
  14 #if IS_ENABLED(CONFIG_KVM)
  15 int __bootdata_preserved(prot_virt_host);
  16 #endif
  17 struct uv_info __bootdata_preserved(uv_info);
  18
  19 void uv_query_info(void)
  20 {
  21         struct uv_cb_qui uvcb = {
  22                 .header.cmd = UVC_CMD_QUI,
  23                 .header.len = sizeof(uvcb)
  24         };
  25
  26         if (!test_facility(158))
  27                 return;
  28
  29         /* rc==0x100 means that there is additional data we do not process */
  30         if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100)
  31                 return;
  32
  33         if (IS_ENABLED(CONFIG_KVM)) {
  34                 memcpy(uv_info.inst_calls_list, uvcb.inst_calls_list, sizeof(uv_info.inst_calls_list));
  35                 uv_info.uv_base_stor_len = uvcb.uv_base_stor_len;
  36                 uv_info.guest_base_stor_len = uvcb.conf_base_phys_stor_len;
  37                 uv_info.guest_virt_base_stor_len = uvcb.conf_base_virt_stor_len;
  38                 uv_info.guest_virt_var_stor_len = uvcb.conf_virt_var_stor_len;
  39                 uv_info.guest_cpu_stor_len = uvcb.cpu_stor_len;
  40                 uv_info.max_sec_stor_addr = ALIGN(uvcb.max_guest_stor_addr, PAGE_SIZE);
  41                 uv_info.max_num_sec_conf = uvcb.max_num_sec_conf;
  42                 uv_info.max_guest_cpu_id = uvcb.max_guest_cpu_id;
  43                 uv_info.uv_feature_indications = uvcb.uv_feature_indications;
  44         }
  45
  46 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
  47         if (test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list) &&
  48             test_bit_inv(BIT_UVC_CMD_REMOVE_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list))
  49                 prot_virt_guest = 1;
  50 #endif
  51 }
  52
  53 #if IS_ENABLED(CONFIG_KVM)
  54 void adjust_to_uv_max(unsigned long *vmax)
  55 {
  56         if (is_prot_virt_host() && uv_info.max_sec_stor_addr)
  57                 *vmax = min_t(unsigned long, *vmax, uv_info.max_sec_stor_addr);
  58 }
  59
  60 static int is_prot_virt_host_capable(void)
  61 {
  62         /* disable if no prot_virt=1 given on command-line */
  63         if (!is_prot_virt_host())
  64                 return 0;
  65         /* disable if protected guest virtualization is enabled */
  66         if (is_prot_virt_guest())
  67                 return 0;
  68         /* disable if no hardware support */
  69         if (!test_facility(158))
  70                 return 0;
  71         /* disable if kdump */
  72         if (oldmem_data.start)
  73                 return 0;
  74         /* disable if stand-alone dump */
  75         if (ipl_block_valid && is_ipl_block_dump())
  76                 return 0;
  77         return 1;
  78 }
  79
  80 void sanitize_prot_virt_host(void)
  81 {
  82         prot_virt_host = is_prot_virt_host_capable();
  83 }
  84 #endif