LXR linux/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
  12int __bootdata_preserved(prot_virt_guest);
  13#endif
  14#if IS_ENABLED(CONFIG_KVM)
  15int __bootdata_preserved(prot_virt_host);
  16#endif
  17struct uv_info __bootdata_preserved(uv_info);
  18
  19void 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)
  54void 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
  60static 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
  80void sanitize_prot_virt_host(void)
  81{
  82        prot_virt_host = is_prot_virt_host_capable();
  83}
  84#endif
  85