linux/arch/s390/boot/uv.c
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   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
   8int __bootdata_preserved(prot_virt_guest);
   9#endif
  10#if IS_ENABLED(CONFIG_KVM)
  11int __bootdata_preserved(prot_virt_host);
  12#endif
  13struct uv_info __bootdata_preserved(uv_info);
  14
  15void 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)
  50static 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
  67void 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
  73