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 #if IS_ENABLED(CONFIG_KVM)
  11 int __bootdata_preserved(prot_virt_host);
  12 #endif
  13 struct uv_info __bootdata_preserved(uv_info);
  14
  15 void uv_query_info(void)
  16 {
  17         struct uv_cb_qui uvcb = {
  18                 .header.cmd = UVC_CMD_QUI,
  19                 .header.len = sizeof(uvcb)
  20         };
  21
  22         if (!test_facility(158))
  23                 return;
  24
  25         /* rc==0x100 means that there is additional data we do not process */
  26         if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100)
  27                 return;
  28
  29         if (IS_ENABLED(CONFIG_KVM)) {
  30                 memcpy(uv_info.inst_calls_list, uvcb.inst_calls_list, sizeof(uv_info.inst_calls_list));
  31                 uv_info.uv_base_stor_len = uvcb.uv_base_stor_len;
  32                 uv_info.guest_base_stor_len = uvcb.conf_base_phys_stor_len;
  33                 uv_info.guest_virt_base_stor_len = uvcb.conf_base_virt_stor_len;
  34                 uv_info.guest_virt_var_stor_len = uvcb.conf_virt_var_stor_len;
  35                 uv_info.guest_cpu_stor_len = uvcb.cpu_stor_len;
  36                 uv_info.max_sec_stor_addr = ALIGN(uvcb.max_guest_stor_addr, PAGE_SIZE);
  37                 uv_info.max_num_sec_conf = uvcb.max_num_sec_conf;
  38                 uv_info.max_guest_cpu_id = uvcb.max_guest_cpu_id;
  39                 uv_info.uv_feature_indications = uvcb.uv_feature_indications;
  40         }
  41
  42 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
  43         if (test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list) &&
  44             test_bit_inv(BIT_UVC_CMD_REMOVE_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list))
  45                 prot_virt_guest = 1;
  46 #endif
  47 }
  48
  49 #if IS_ENABLED(CONFIG_KVM)
  50 static bool has_uv_sec_stor_limit(void)
  51 {
  52         /*
  53          * keep these conditions in line with setup_uv()
  54          */
  55         if (!is_prot_virt_host())
  56                 return false;
  57
  58         if (is_prot_virt_guest())
  59                 return false;
  60
  61         if (!test_facility(158))
  62                 return false;
  63
  64         return !!uv_info.max_sec_stor_addr;
  65 }
  66
  67 void adjust_to_uv_max(unsigned long *vmax)
  68 {
  69         if (has_uv_sec_stor_limit())
  70                 *vmax = min_t(unsigned long, *vmax, uv_info.max_sec_stor_addr);
  71 }
  72 #endif