s390/boot/uv.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <asm/uv.h>
0003 #include <asm/boot_data.h>
0004 #include <asm/facility.h>
0005 #include <asm/sections.h>
0006
0007 #include "boot.h"
0008 #include "uv.h"
0009
0010 /* will be used in arch/s390/kernel/uv.c */
0011 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
0012 int __bootdata_preserved(prot_virt_guest);
0013 #endif
0014 #if IS_ENABLED(CONFIG_KVM)
0015 int __bootdata_preserved(prot_virt_host);
0016 #endif
0017 struct uv_info __bootdata_preserved(uv_info);
0018
0019 void uv_query_info(void)
0020 {
0021     struct uv_cb_qui uvcb = {
0022         .header.cmd = UVC_CMD_QUI,
0023         .header.len = sizeof(uvcb)
0024     };
0025
0026     if (!test_facility(158))
0027         return;
0028
0029     /* rc==0x100 means that there is additional data we do not process */
0030     if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100)
0031         return;
0032
0033     if (IS_ENABLED(CONFIG_KVM)) {
0034         memcpy(uv_info.inst_calls_list, uvcb.inst_calls_list, sizeof(uv_info.inst_calls_list));
0035         uv_info.uv_base_stor_len = uvcb.uv_base_stor_len;
0036         uv_info.guest_base_stor_len = uvcb.conf_base_phys_stor_len;
0037         uv_info.guest_virt_base_stor_len = uvcb.conf_base_virt_stor_len;
0038         uv_info.guest_virt_var_stor_len = uvcb.conf_virt_var_stor_len;
0039         uv_info.guest_cpu_stor_len = uvcb.cpu_stor_len;
0040         uv_info.max_sec_stor_addr = ALIGN(uvcb.max_guest_stor_addr, PAGE_SIZE);
0041         uv_info.max_num_sec_conf = uvcb.max_num_sec_conf;
0042         uv_info.max_guest_cpu_id = uvcb.max_guest_cpu_id;
0043         uv_info.uv_feature_indications = uvcb.uv_feature_indications;
0044         uv_info.supp_se_hdr_ver = uvcb.supp_se_hdr_versions;
0045         uv_info.supp_se_hdr_pcf = uvcb.supp_se_hdr_pcf;
0046         uv_info.conf_dump_storage_state_len = uvcb.conf_dump_storage_state_len;
0047         uv_info.conf_dump_finalize_len = uvcb.conf_dump_finalize_len;
0048         uv_info.supp_att_req_hdr_ver = uvcb.supp_att_req_hdr_ver;
0049         uv_info.supp_att_pflags = uvcb.supp_att_pflags;
0050     }
0051
0052 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
0053     if (test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list) &&
0054         test_bit_inv(BIT_UVC_CMD_REMOVE_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list))
0055         prot_virt_guest = 1;
0056 #endif
0057 }
0058
0059 #if IS_ENABLED(CONFIG_KVM)
0060 unsigned long adjust_to_uv_max(unsigned long limit)
0061 {
0062     if (is_prot_virt_host() && uv_info.max_sec_stor_addr)
0063         limit = min_t(unsigned long, limit, uv_info.max_sec_stor_addr);
0064     return limit;
0065 }
0066
0067 static int is_prot_virt_host_capable(void)
0068 {
0069     /* disable if no prot_virt=1 given on command-line */
0070     if (!is_prot_virt_host())
0071         return 0;
0072     /* disable if protected guest virtualization is enabled */
0073     if (is_prot_virt_guest())
0074         return 0;
0075     /* disable if no hardware support */
0076     if (!test_facility(158))
0077         return 0;
0078     /* disable if kdump */
0079     if (oldmem_data.start)
0080         return 0;
0081     /* disable if stand-alone dump */
0082     if (ipl_block_valid && is_ipl_block_dump())
0083         return 0;
0084     return 1;
0085 }
0086
0087 void sanitize_prot_virt_host(void)
0088 {
0089     prot_virt_host = is_prot_virt_host_capable();
0090 }
0091 #endif