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