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 int __bootdata_preserved(prot_virt_guest);
12 int __bootdata_preserved(prot_virt_host);
13 struct uv_info __bootdata_preserved(uv_info);
14
15 void uv_query_info(void)
16 {
17 struct uv_cb_qui uvcb = {
18 .header.cmd = UVC_CMD_QUI,
19 .header.len = sizeof(uvcb)
20 };
21
22 if (!test_facility(158))
23 return;
24
25 /* rc==0x100 means that there is additional data we do not process */
26 if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100)
27 return;
28
29 if (IS_ENABLED(CONFIG_KVM)) {
30 memcpy(uv_info.inst_calls_list, uvcb.inst_calls_list, sizeof(uv_info.inst_calls_list));
31 uv_info.uv_base_stor_len = uvcb.uv_base_stor_len;
32 uv_info.guest_base_stor_len = uvcb.conf_base_phys_stor_len;
33 uv_info.guest_virt_base_stor_len = uvcb.conf_base_virt_stor_len;
34 uv_info.guest_virt_var_stor_len = uvcb.conf_virt_var_stor_len;
35 uv_info.guest_cpu_stor_len = uvcb.cpu_stor_len;
36 uv_info.max_sec_stor_addr = ALIGN(uvcb.max_guest_stor_addr, PAGE_SIZE);
37 uv_info.max_num_sec_conf = uvcb.max_num_sec_conf;
38 uv_info.max_guest_cpu_id = uvcb.max_guest_cpu_id;
39 uv_info.uv_feature_indications = uvcb.uv_feature_indications;
40 uv_info.supp_se_hdr_ver = uvcb.supp_se_hdr_versions;
41 uv_info.supp_se_hdr_pcf = uvcb.supp_se_hdr_pcf;
42 uv_info.conf_dump_storage_state_len = uvcb.conf_dump_storage_state_len;
43 uv_info.conf_dump_finalize_len = uvcb.conf_dump_finalize_len;
44 uv_info.supp_att_req_hdr_ver = uvcb.supp_att_req_hdr_ver;
45 uv_info.supp_att_pflags = uvcb.supp_att_pflags;
46 uv_info.supp_add_secret_req_ver = uvcb.supp_add_secret_req_ver;
47 uv_info.supp_add_secret_pcf = uvcb.supp_add_secret_pcf;
48 uv_info.supp_secret_types = uvcb.supp_secret_types;
49 uv_info.max_secrets = uvcb.max_secrets;
50 }
51
52 if (test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list) &&
53 test_bit_inv(BIT_UVC_CMD_REMOVE_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list))
54 prot_virt_guest = 1;
55 }
56
57 unsigned long adjust_to_uv_max(unsigned long limit)
58 {
59 if (is_prot_virt_host() && uv_info.max_sec_stor_addr)
60 limit = min_t(unsigned long, limit, uv_info.max_sec_stor_addr);
61 return limit;
62 }
63
64 static int is_prot_virt_host_capable(void)
65 {
66 /* disable if no prot_virt=1 given on command-line */
67 if (!is_prot_virt_host())
68 return 0;
69 /* disable if protected guest virtualization is enabled */
70 if (is_prot_virt_guest())
71 return 0;
72 /* disable if no hardware support */
73 if (!test_facility(158))
74 return 0;
75 /* disable if kdump */
76 if (oldmem_data.start)
77 return 0;
78 /* disable if stand-alone dump */
79 if (ipl_block_valid && is_ipl_block_dump())
80 return 0;
81 return 1;
82 }
83
84 void sanitize_prot_virt_host(void)
85 {
86 prot_virt_host = is_prot_virt_host_capable();
87 }
88
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