arch/s390/boot/uv.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <asm/uv.h>
   3 #include <asm/facility.h>
   4 #include <asm/sections.h>
   5
   6 /* will be used in arch/s390/kernel/uv.c */
   7 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
   8 int __bootdata_preserved(prot_virt_guest);
   9 #endif
  10 struct uv_info __bootdata_preserved(uv_info);
  11
  12 void uv_query_info(void)
  13 {
  14         struct uv_cb_qui uvcb = {
  15                 .header.cmd = UVC_CMD_QUI,
  16                 .header.len = sizeof(uvcb)
  17         };
  18
  19         if (!test_facility(158))
  20                 return;
  21
  22         /* rc==0x100 means that there is additional data we do not process */
  23         if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100)
  24                 return;
  25
  26         if (IS_ENABLED(CONFIG_KVM)) {
  27                 memcpy(uv_info.inst_calls_list, uvcb.inst_calls_list, sizeof(uv_info.inst_calls_list));
  28                 uv_info.uv_base_stor_len = uvcb.uv_base_stor_len;
  29                 uv_info.guest_base_stor_len = uvcb.conf_base_phys_stor_len;
  30                 uv_info.guest_virt_base_stor_len = uvcb.conf_base_virt_stor_len;
  31                 uv_info.guest_virt_var_stor_len = uvcb.conf_virt_var_stor_len;
  32                 uv_info.guest_cpu_stor_len = uvcb.cpu_stor_len;
  33                 uv_info.max_sec_stor_addr = ALIGN(uvcb.max_guest_stor_addr, PAGE_SIZE);
  34                 uv_info.max_num_sec_conf = uvcb.max_num_sec_conf;
  35                 uv_info.max_guest_cpus = uvcb.max_guest_cpus;
  36         }
  37
  38 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
  39         if (test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list) &&
  40             test_bit_inv(BIT_UVC_CMD_REMOVE_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list))
  41                 prot_virt_guest = 1;
  42 #endif
  43 }