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#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
12int __bootdata_preserved(prot_virt_guest);
13#endif
14#if IS_ENABLED(CONFIG_KVM)
15int __bootdata_preserved(prot_virt_host);
16#endif
17struct uv_info __bootdata_preserved(uv_info);
18
19void uv_query_info(void)
20{
21 struct uv_cb_qui uvcb = {
22 .header.cmd = UVC_CMD_QUI,
23 .header.len = sizeof(uvcb)
24 };
25
26 if (!test_facility(158))
27 return;
28
29 /* rc==0x100 means that there is additional data we do not process */
30 if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100)
31 return;
32
33 if (IS_ENABLED(CONFIG_KVM)) {
34 memcpy(uv_info.inst_calls_list, uvcb.inst_calls_list, sizeof(uv_info.inst_calls_list));
35 uv_info.uv_base_stor_len = uvcb.uv_base_stor_len;
36 uv_info.guest_base_stor_len = uvcb.conf_base_phys_stor_len;
37 uv_info.guest_virt_base_stor_len = uvcb.conf_base_virt_stor_len;
38 uv_info.guest_virt_var_stor_len = uvcb.conf_virt_var_stor_len;
39 uv_info.guest_cpu_stor_len = uvcb.cpu_stor_len;
40 uv_info.max_sec_stor_addr = ALIGN(uvcb.max_guest_stor_addr, PAGE_SIZE);
41 uv_info.max_num_sec_conf = uvcb.max_num_sec_conf;
42 uv_info.max_guest_cpu_id = uvcb.max_guest_cpu_id;
43 uv_info.uv_feature_indications = uvcb.uv_feature_indications;
44 uv_info.supp_se_hdr_ver = uvcb.supp_se_hdr_versions;
45 uv_info.supp_se_hdr_pcf = uvcb.supp_se_hdr_pcf;
46 uv_info.conf_dump_storage_state_len = uvcb.conf_dump_storage_state_len;
47 uv_info.conf_dump_finalize_len = uvcb.conf_dump_finalize_len;
48 uv_info.supp_att_req_hdr_ver = uvcb.supp_att_req_hdr_ver;
49 uv_info.supp_att_pflags = uvcb.supp_att_pflags;
50 uv_info.supp_add_secret_req_ver = uvcb.supp_add_secret_req_ver;
51 uv_info.supp_add_secret_pcf = uvcb.supp_add_secret_pcf;
52 uv_info.supp_secret_types = uvcb.supp_secret_types;
53 uv_info.max_secrets = uvcb.max_secrets;
54 }
55
56#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
57 if (test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list) &&
58 test_bit_inv(BIT_UVC_CMD_REMOVE_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list))
59 prot_virt_guest = 1;
60#endif
61}
62
63#if IS_ENABLED(CONFIG_KVM)
64unsigned long adjust_to_uv_max(unsigned long limit)
65{
66 if (is_prot_virt_host() && uv_info.max_sec_stor_addr)
67 limit = min_t(unsigned long, limit, uv_info.max_sec_stor_addr);
68 return limit;
69}
70
71static int is_prot_virt_host_capable(void)
72{
73 /* disable if no prot_virt=1 given on command-line */
74 if (!is_prot_virt_host())
75 return 0;
76 /* disable if protected guest virtualization is enabled */
77 if (is_prot_virt_guest())
78 return 0;
79 /* disable if no hardware support */
80 if (!test_facility(158))
81 return 0;
82 /* disable if kdump */
83 if (oldmem_data.start)
84 return 0;
85 /* disable if stand-alone dump */
86 if (ipl_block_valid && is_ipl_block_dump())
87 return 0;
88 return 1;
89}
90
91void sanitize_prot_virt_host(void)
92{
93 prot_virt_host = is_prot_virt_host_capable();
94}
95#endif
96

source code of linux/arch/s390/boot/uv.c