| // SPDX-License-Identifier: GPL-2.0 |
| #include <asm/uv.h> |
| #include <asm/facility.h> |
| #include <asm/sections.h> |
| |
| /* will be used in arch/s390/kernel/uv.c */ |
| #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST |
| int __bootdata_preserved(prot_virt_guest); |
| #endif |
| #if IS_ENABLED(CONFIG_KVM) |
| int __bootdata_preserved(prot_virt_host); |
| #endif |
| struct uv_info __bootdata_preserved(uv_info); |
| |
| void uv_query_info(void) |
| { |
| struct uv_cb_qui uvcb = { |
| .header.cmd = UVC_CMD_QUI, |
| .header.len = sizeof(uvcb) |
| }; |
| |
| if (!test_facility(158)) |
| return; |
| |
| /* rc==0x100 means that there is additional data we do not process */ |
| if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100) |
| return; |
| |
| if (IS_ENABLED(CONFIG_KVM)) { |
| memcpy(uv_info.inst_calls_list, uvcb.inst_calls_list, sizeof(uv_info.inst_calls_list)); |
| uv_info.uv_base_stor_len = uvcb.uv_base_stor_len; |
| uv_info.guest_base_stor_len = uvcb.conf_base_phys_stor_len; |
| uv_info.guest_virt_base_stor_len = uvcb.conf_base_virt_stor_len; |
| uv_info.guest_virt_var_stor_len = uvcb.conf_virt_var_stor_len; |
| uv_info.guest_cpu_stor_len = uvcb.cpu_stor_len; |
| uv_info.max_sec_stor_addr = ALIGN(uvcb.max_guest_stor_addr, PAGE_SIZE); |
| uv_info.max_num_sec_conf = uvcb.max_num_sec_conf; |
| uv_info.max_guest_cpu_id = uvcb.max_guest_cpu_id; |
| uv_info.uv_feature_indications = uvcb.uv_feature_indications; |
| } |
| |
| #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST |
| if (test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list) && |
| test_bit_inv(BIT_UVC_CMD_REMOVE_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list)) |
| prot_virt_guest = 1; |
| #endif |
| } |
| |
| #if IS_ENABLED(CONFIG_KVM) |
| static bool has_uv_sec_stor_limit(void) |
| { |
| /* |
| * keep these conditions in line with setup_uv() |
| */ |
| if (!is_prot_virt_host()) |
| return false; |
| |
| if (is_prot_virt_guest()) |
| return false; |
| |
| if (!test_facility(158)) |
| return false; |
| |
| return !!uv_info.max_sec_stor_addr; |
| } |
| |
| void adjust_to_uv_max(unsigned long *vmax) |
| { |
| if (has_uv_sec_stor_limit()) |
| *vmax = min_t(unsigned long, *vmax, uv_info.max_sec_stor_addr); |
| } |
| #endif |