15abb9351SVasily Gorbik // SPDX-License-Identifier: GPL-2.0 25abb9351SVasily Gorbik #include <asm/uv.h> 35abb9351SVasily Gorbik #include <asm/facility.h> 45abb9351SVasily Gorbik #include <asm/sections.h> 55abb9351SVasily Gorbik 6ecdc5d84SVasily Gorbik /* will be used in arch/s390/kernel/uv.c */ 7ecdc5d84SVasily Gorbik #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST 85abb9351SVasily Gorbik int __bootdata_preserved(prot_virt_guest); 9ecdc5d84SVasily Gorbik #endif 101d6671aeSVasily Gorbik #if IS_ENABLED(CONFIG_KVM) 111d6671aeSVasily Gorbik int __bootdata_preserved(prot_virt_host); 121d6671aeSVasily Gorbik #endif 13ecdc5d84SVasily Gorbik struct uv_info __bootdata_preserved(uv_info); 145abb9351SVasily Gorbik 155abb9351SVasily Gorbik void uv_query_info(void) 165abb9351SVasily Gorbik { 175abb9351SVasily Gorbik struct uv_cb_qui uvcb = { 185abb9351SVasily Gorbik .header.cmd = UVC_CMD_QUI, 195abb9351SVasily Gorbik .header.len = sizeof(uvcb) 205abb9351SVasily Gorbik }; 215abb9351SVasily Gorbik 225abb9351SVasily Gorbik if (!test_facility(158)) 235abb9351SVasily Gorbik return; 245abb9351SVasily Gorbik 2527dc0700SChristian Borntraeger /* rc==0x100 means that there is additional data we do not process */ 2627dc0700SChristian Borntraeger if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100) 275abb9351SVasily Gorbik return; 285abb9351SVasily Gorbik 29ecdc5d84SVasily Gorbik if (IS_ENABLED(CONFIG_KVM)) { 30ecdc5d84SVasily Gorbik memcpy(uv_info.inst_calls_list, uvcb.inst_calls_list, sizeof(uv_info.inst_calls_list)); 31ecdc5d84SVasily Gorbik uv_info.uv_base_stor_len = uvcb.uv_base_stor_len; 32ecdc5d84SVasily Gorbik uv_info.guest_base_stor_len = uvcb.conf_base_phys_stor_len; 33ecdc5d84SVasily Gorbik uv_info.guest_virt_base_stor_len = uvcb.conf_base_virt_stor_len; 34ecdc5d84SVasily Gorbik uv_info.guest_virt_var_stor_len = uvcb.conf_virt_var_stor_len; 35ecdc5d84SVasily Gorbik uv_info.guest_cpu_stor_len = uvcb.cpu_stor_len; 36ecdc5d84SVasily Gorbik uv_info.max_sec_stor_addr = ALIGN(uvcb.max_guest_stor_addr, PAGE_SIZE); 37ecdc5d84SVasily Gorbik uv_info.max_num_sec_conf = uvcb.max_num_sec_conf; 38e82080e1SJanosch Frank uv_info.max_guest_cpu_id = uvcb.max_guest_cpu_id; 39ecdc5d84SVasily Gorbik } 40ecdc5d84SVasily Gorbik 41ecdc5d84SVasily Gorbik #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST 425abb9351SVasily Gorbik if (test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list) && 435abb9351SVasily Gorbik test_bit_inv(BIT_UVC_CMD_REMOVE_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list)) 445abb9351SVasily Gorbik prot_virt_guest = 1; 45ecdc5d84SVasily Gorbik #endif 465abb9351SVasily Gorbik } 47*0c4f2623SVasily Gorbik 48*0c4f2623SVasily Gorbik #if IS_ENABLED(CONFIG_KVM) 49*0c4f2623SVasily Gorbik static bool has_uv_sec_stor_limit(void) 50*0c4f2623SVasily Gorbik { 51*0c4f2623SVasily Gorbik /* 52*0c4f2623SVasily Gorbik * keep these conditions in line with setup_uv() 53*0c4f2623SVasily Gorbik */ 54*0c4f2623SVasily Gorbik if (!is_prot_virt_host()) 55*0c4f2623SVasily Gorbik return false; 56*0c4f2623SVasily Gorbik 57*0c4f2623SVasily Gorbik if (is_prot_virt_guest()) 58*0c4f2623SVasily Gorbik return false; 59*0c4f2623SVasily Gorbik 60*0c4f2623SVasily Gorbik if (!test_facility(158)) 61*0c4f2623SVasily Gorbik return false; 62*0c4f2623SVasily Gorbik 63*0c4f2623SVasily Gorbik return !!uv_info.max_sec_stor_addr; 64*0c4f2623SVasily Gorbik } 65*0c4f2623SVasily Gorbik 66*0c4f2623SVasily Gorbik void adjust_to_uv_max(unsigned long *vmax) 67*0c4f2623SVasily Gorbik { 68*0c4f2623SVasily Gorbik if (has_uv_sec_stor_limit()) 69*0c4f2623SVasily Gorbik *vmax = min_t(unsigned long, *vmax, uv_info.max_sec_stor_addr); 70*0c4f2623SVasily Gorbik } 71*0c4f2623SVasily Gorbik #endif 72