1 // SPDX-License-Identifier: GPL-2.0
3 #include <asm/boot_data.h>
4 #include <asm/facility.h>
5 #include <asm/sections.h>
10 /* will be used in arch/s390/kernel/uv.c */
11 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
12 int __bootdata_preserved(prot_virt_guest);
14 #if IS_ENABLED(CONFIG_KVM)
15 int __bootdata_preserved(prot_virt_host);
17 struct uv_info __bootdata_preserved(uv_info);
19 void uv_query_info(void)
21 struct uv_cb_qui uvcb = {
22 .header.cmd = UVC_CMD_QUI,
23 .header.len = sizeof(uvcb)
26 if (!test_facility(158))
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)
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;
46 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
47 if (test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list) &&
48 test_bit_inv(BIT_UVC_CMD_REMOVE_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list))
53 #if IS_ENABLED(CONFIG_KVM)
54 void adjust_to_uv_max(unsigned long *vmax)
56 if (is_prot_virt_host() && uv_info.max_sec_stor_addr)
57 *vmax = min_t(unsigned long, *vmax, uv_info.max_sec_stor_addr);
60 static int is_prot_virt_host_capable(void)
62 /* disable if no prot_virt=1 given on command-line */
63 if (!is_prot_virt_host())
65 /* disable if protected guest virtualization is enabled */
66 if (is_prot_virt_guest())
68 /* disable if no hardware support */
69 if (!test_facility(158))
71 /* disable if kdump */
72 if (oldmem_data.start)
74 /* disable if stand-alone dump */
75 if (ipl_block_valid && is_ipl_block_dump())
80 void sanitize_prot_virt_host(void)
82 prot_virt_host = is_prot_virt_host_capable();