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