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 6*c5cf5054SAlexander Egorenkov #include "uv.h" 7*c5cf5054SAlexander Egorenkov 8ecdc5d84SVasily Gorbik /* will be used in arch/s390/kernel/uv.c */ 9ecdc5d84SVasily Gorbik #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST 105abb9351SVasily Gorbik int __bootdata_preserved(prot_virt_guest); 11ecdc5d84SVasily Gorbik #endif 121d6671aeSVasily Gorbik #if IS_ENABLED(CONFIG_KVM) 131d6671aeSVasily Gorbik int __bootdata_preserved(prot_virt_host); 141d6671aeSVasily Gorbik #endif 15ecdc5d84SVasily Gorbik struct uv_info __bootdata_preserved(uv_info); 165abb9351SVasily Gorbik 175abb9351SVasily Gorbik void uv_query_info(void) 185abb9351SVasily Gorbik { 195abb9351SVasily Gorbik struct uv_cb_qui uvcb = { 205abb9351SVasily Gorbik .header.cmd = UVC_CMD_QUI, 215abb9351SVasily Gorbik .header.len = sizeof(uvcb) 225abb9351SVasily Gorbik }; 235abb9351SVasily Gorbik 245abb9351SVasily Gorbik if (!test_facility(158)) 255abb9351SVasily Gorbik return; 265abb9351SVasily Gorbik 2727dc0700SChristian Borntraeger /* rc==0x100 means that there is additional data we do not process */ 2827dc0700SChristian Borntraeger if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100) 295abb9351SVasily Gorbik return; 305abb9351SVasily Gorbik 31ecdc5d84SVasily Gorbik if (IS_ENABLED(CONFIG_KVM)) { 32ecdc5d84SVasily Gorbik memcpy(uv_info.inst_calls_list, uvcb.inst_calls_list, sizeof(uv_info.inst_calls_list)); 33ecdc5d84SVasily Gorbik uv_info.uv_base_stor_len = uvcb.uv_base_stor_len; 34ecdc5d84SVasily Gorbik uv_info.guest_base_stor_len = uvcb.conf_base_phys_stor_len; 35ecdc5d84SVasily Gorbik uv_info.guest_virt_base_stor_len = uvcb.conf_base_virt_stor_len; 36ecdc5d84SVasily Gorbik uv_info.guest_virt_var_stor_len = uvcb.conf_virt_var_stor_len; 37ecdc5d84SVasily Gorbik uv_info.guest_cpu_stor_len = uvcb.cpu_stor_len; 38ecdc5d84SVasily Gorbik uv_info.max_sec_stor_addr = ALIGN(uvcb.max_guest_stor_addr, PAGE_SIZE); 39ecdc5d84SVasily Gorbik uv_info.max_num_sec_conf = uvcb.max_num_sec_conf; 40e82080e1SJanosch Frank uv_info.max_guest_cpu_id = uvcb.max_guest_cpu_id; 4185b18d7bSJanosch Frank uv_info.uv_feature_indications = uvcb.uv_feature_indications; 42ecdc5d84SVasily Gorbik } 43ecdc5d84SVasily Gorbik 44ecdc5d84SVasily Gorbik #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST 455abb9351SVasily Gorbik if (test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list) && 465abb9351SVasily Gorbik test_bit_inv(BIT_UVC_CMD_REMOVE_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list)) 475abb9351SVasily Gorbik prot_virt_guest = 1; 48ecdc5d84SVasily Gorbik #endif 495abb9351SVasily Gorbik } 500c4f2623SVasily Gorbik 510c4f2623SVasily Gorbik #if IS_ENABLED(CONFIG_KVM) 520c4f2623SVasily Gorbik static bool has_uv_sec_stor_limit(void) 530c4f2623SVasily Gorbik { 540c4f2623SVasily Gorbik /* 550c4f2623SVasily Gorbik * keep these conditions in line with setup_uv() 560c4f2623SVasily Gorbik */ 570c4f2623SVasily Gorbik if (!is_prot_virt_host()) 580c4f2623SVasily Gorbik return false; 590c4f2623SVasily Gorbik 600c4f2623SVasily Gorbik if (is_prot_virt_guest()) 610c4f2623SVasily Gorbik return false; 620c4f2623SVasily Gorbik 630c4f2623SVasily Gorbik if (!test_facility(158)) 640c4f2623SVasily Gorbik return false; 650c4f2623SVasily Gorbik 660c4f2623SVasily Gorbik return !!uv_info.max_sec_stor_addr; 670c4f2623SVasily Gorbik } 680c4f2623SVasily Gorbik 690c4f2623SVasily Gorbik void adjust_to_uv_max(unsigned long *vmax) 700c4f2623SVasily Gorbik { 710c4f2623SVasily Gorbik if (has_uv_sec_stor_limit()) 720c4f2623SVasily Gorbik *vmax = min_t(unsigned long, *vmax, uv_info.max_sec_stor_addr); 730c4f2623SVasily Gorbik } 740c4f2623SVasily Gorbik #endif 75