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 int __bootdata_preserved(prot_virt_guest);
   7
   8 void uv_query_info(void)
   9 {
  10         struct uv_cb_qui uvcb = {
  11                 .header.cmd = UVC_CMD_QUI,
  12                 .header.len = sizeof(uvcb)
  13         };
  14
  15         if (!test_facility(158))
  16                 return;
  17
  18         /* rc==0x100 means that there is additional data we do not process */
  19         if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100)
  20                 return;
  21
  22         if (test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list) &&
  23             test_bit_inv(BIT_UVC_CMD_REMOVE_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list))
  24                 prot_virt_guest = 1;
  25 }