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 int __bootdata_preserved(prot_virt_guest); 12 int __bootdata_preserved(prot_virt_host); 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 /* Ignore that there might be more data we do not process */ 26 if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != UVC_RC_MORE_DATA) 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 uv_info.supp_se_hdr_ver = uvcb.supp_se_hdr_versions; 41 uv_info.supp_se_hdr_pcf = uvcb.supp_se_hdr_pcf; 42 uv_info.conf_dump_storage_state_len = uvcb.conf_dump_storage_state_len; 43 uv_info.conf_dump_finalize_len = uvcb.conf_dump_finalize_len; 44 uv_info.supp_att_req_hdr_ver = uvcb.supp_att_req_hdr_ver; 45 uv_info.supp_att_pflags = uvcb.supp_att_pflags; 46 uv_info.supp_add_secret_req_ver = uvcb.supp_add_secret_req_ver; 47 uv_info.supp_add_secret_pcf = uvcb.supp_add_secret_pcf; 48 uv_info.supp_secret_types = uvcb.supp_secret_types; 49 uv_info.max_assoc_secrets = uvcb.max_assoc_secrets; 50 uv_info.max_retr_secrets = uvcb.max_retr_secrets; 51 } 52 53 if (test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list) && 54 test_bit_inv(BIT_UVC_CMD_REMOVE_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list)) 55 prot_virt_guest = 1; 56 } 57 58 unsigned long adjust_to_uv_max(unsigned long limit) 59 { 60 if (is_prot_virt_host() && uv_info.max_sec_stor_addr) 61 limit = min_t(unsigned long, limit, uv_info.max_sec_stor_addr); 62 return limit; 63 } 64 65 static int is_prot_virt_host_capable(void) 66 { 67 /* disable if no prot_virt=1 given on command-line */ 68 if (!is_prot_virt_host()) 69 return 0; 70 /* disable if protected guest virtualization is enabled */ 71 if (is_prot_virt_guest()) 72 return 0; 73 /* disable if no hardware support */ 74 if (!test_facility(158)) 75 return 0; 76 /* disable if kdump */ 77 if (oldmem_data.start) 78 return 0; 79 /* disable if stand-alone dump */ 80 if (ipl_block_valid && is_ipl_block_dump()) 81 return 0; 82 return 1; 83 } 84 85 void sanitize_prot_virt_host(void) 86 { 87 prot_virt_host = is_prot_virt_host_capable(); 88 } 89