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0fb6bd07 MR |
1 | /* |
2 | * SPAPR TPM Proxy/Hypercall | |
3 | * | |
4 | * Copyright IBM Corp. 2019 | |
5 | * | |
6 | * Authors: | |
7 | * Michael Roth <mdroth@linux.vnet.ibm.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
10 | * See the COPYING file in the top-level directory. | |
11 | */ | |
12 | ||
13 | #include "qemu/osdep.h" | |
0fb6bd07 MR |
14 | #include "qapi/error.h" |
15 | #include "qemu/error-report.h" | |
16 | #include "sysemu/reset.h" | |
0fb6bd07 MR |
17 | #include "hw/ppc/spapr.h" |
18 | #include "hw/qdev-properties.h" | |
19 | #include "trace.h" | |
20 | ||
21 | #define TPM_SPAPR_BUFSIZE 4096 | |
22 | ||
23 | enum { | |
24 | TPM_COMM_OP_EXECUTE = 1, | |
25 | TPM_COMM_OP_CLOSE_SESSION = 2, | |
26 | }; | |
27 | ||
28 | static void spapr_tpm_proxy_reset(void *opaque) | |
29 | { | |
30 | SpaprTpmProxy *tpm_proxy = SPAPR_TPM_PROXY(opaque); | |
31 | ||
32 | if (tpm_proxy->host_fd != -1) { | |
33 | close(tpm_proxy->host_fd); | |
34 | tpm_proxy->host_fd = -1; | |
35 | } | |
36 | } | |
37 | ||
38 | static ssize_t tpm_execute(SpaprTpmProxy *tpm_proxy, target_ulong *args) | |
39 | { | |
40 | uint64_t data_in = ppc64_phys_to_real(args[1]); | |
41 | target_ulong data_in_size = args[2]; | |
42 | uint64_t data_out = ppc64_phys_to_real(args[3]); | |
43 | target_ulong data_out_size = args[4]; | |
44 | uint8_t buf_in[TPM_SPAPR_BUFSIZE]; | |
45 | uint8_t buf_out[TPM_SPAPR_BUFSIZE]; | |
46 | ssize_t ret; | |
47 | ||
48 | trace_spapr_tpm_execute(data_in, data_in_size, data_out, data_out_size); | |
49 | ||
50 | if (data_in_size > TPM_SPAPR_BUFSIZE) { | |
51 | error_report("invalid TPM input buffer size: " TARGET_FMT_lu, | |
52 | data_in_size); | |
53 | return H_P3; | |
54 | } | |
55 | ||
56 | if (data_out_size < TPM_SPAPR_BUFSIZE) { | |
57 | error_report("invalid TPM output buffer size: " TARGET_FMT_lu, | |
58 | data_out_size); | |
59 | return H_P5; | |
60 | } | |
61 | ||
62 | if (tpm_proxy->host_fd == -1) { | |
63 | tpm_proxy->host_fd = open(tpm_proxy->host_path, O_RDWR); | |
64 | if (tpm_proxy->host_fd == -1) { | |
65 | error_report("failed to open TPM device %s: %d", | |
66 | tpm_proxy->host_path, errno); | |
67 | return H_RESOURCE; | |
68 | } | |
69 | } | |
70 | ||
71 | cpu_physical_memory_read(data_in, buf_in, data_in_size); | |
72 | ||
73 | do { | |
74 | ret = write(tpm_proxy->host_fd, buf_in, data_in_size); | |
75 | if (ret > 0) { | |
76 | data_in_size -= ret; | |
77 | } | |
78 | } while ((ret >= 0 && data_in_size > 0) || (ret == -1 && errno == EINTR)); | |
79 | ||
80 | if (ret == -1) { | |
81 | error_report("failed to write to TPM device %s: %d", | |
82 | tpm_proxy->host_path, errno); | |
83 | return H_RESOURCE; | |
84 | } | |
85 | ||
86 | do { | |
87 | ret = read(tpm_proxy->host_fd, buf_out, data_out_size); | |
88 | } while (ret == 0 || (ret == -1 && errno == EINTR)); | |
89 | ||
90 | if (ret == -1) { | |
91 | error_report("failed to read from TPM device %s: %d", | |
92 | tpm_proxy->host_path, errno); | |
93 | return H_RESOURCE; | |
94 | } | |
95 | ||
96 | cpu_physical_memory_write(data_out, buf_out, ret); | |
97 | args[0] = ret; | |
98 | ||
99 | return H_SUCCESS; | |
100 | } | |
101 | ||
102 | static target_ulong h_tpm_comm(PowerPCCPU *cpu, | |
103 | SpaprMachineState *spapr, | |
104 | target_ulong opcode, | |
105 | target_ulong *args) | |
106 | { | |
107 | target_ulong op = args[0]; | |
108 | SpaprTpmProxy *tpm_proxy = spapr->tpm_proxy; | |
109 | ||
110 | if (!tpm_proxy) { | |
111 | error_report("TPM proxy not available"); | |
112 | return H_FUNCTION; | |
113 | } | |
114 | ||
226c9d15 | 115 | trace_spapr_h_tpm_comm(tpm_proxy->host_path, op); |
0fb6bd07 MR |
116 | |
117 | switch (op) { | |
118 | case TPM_COMM_OP_EXECUTE: | |
119 | return tpm_execute(tpm_proxy, args); | |
120 | case TPM_COMM_OP_CLOSE_SESSION: | |
121 | spapr_tpm_proxy_reset(tpm_proxy); | |
122 | return H_SUCCESS; | |
123 | default: | |
124 | return H_PARAMETER; | |
125 | } | |
126 | } | |
127 | ||
128 | static void spapr_tpm_proxy_realize(DeviceState *d, Error **errp) | |
129 | { | |
130 | SpaprTpmProxy *tpm_proxy = SPAPR_TPM_PROXY(d); | |
131 | ||
132 | if (tpm_proxy->host_path == NULL) { | |
133 | error_setg(errp, "must specify 'host-path' option for device"); | |
134 | return; | |
135 | } | |
136 | ||
137 | tpm_proxy->host_fd = -1; | |
138 | qemu_register_reset(spapr_tpm_proxy_reset, tpm_proxy); | |
139 | } | |
140 | ||
b69c3c21 | 141 | static void spapr_tpm_proxy_unrealize(DeviceState *d) |
0fb6bd07 MR |
142 | { |
143 | SpaprTpmProxy *tpm_proxy = SPAPR_TPM_PROXY(d); | |
144 | ||
145 | qemu_unregister_reset(spapr_tpm_proxy_reset, tpm_proxy); | |
146 | } | |
147 | ||
148 | static Property spapr_tpm_proxy_properties[] = { | |
149 | DEFINE_PROP_STRING("host-path", SpaprTpmProxy, host_path), | |
150 | DEFINE_PROP_END_OF_LIST(), | |
151 | }; | |
152 | ||
153 | static void spapr_tpm_proxy_class_init(ObjectClass *k, void *data) | |
154 | { | |
155 | DeviceClass *dk = DEVICE_CLASS(k); | |
156 | ||
157 | dk->realize = spapr_tpm_proxy_realize; | |
158 | dk->unrealize = spapr_tpm_proxy_unrealize; | |
159 | dk->user_creatable = true; | |
4f67d30b | 160 | device_class_set_props(dk, spapr_tpm_proxy_properties); |
0fb6bd07 MR |
161 | } |
162 | ||
163 | static const TypeInfo spapr_tpm_proxy_info = { | |
164 | .name = TYPE_SPAPR_TPM_PROXY, | |
165 | .parent = TYPE_DEVICE, | |
166 | .instance_size = sizeof(SpaprTpmProxy), | |
167 | .class_init = spapr_tpm_proxy_class_init, | |
168 | }; | |
169 | ||
170 | static void spapr_tpm_proxy_register_types(void) | |
171 | { | |
172 | type_register_static(&spapr_tpm_proxy_info); | |
173 | spapr_register_hypercall(SVM_H_TPM_COMM, h_tpm_comm); | |
174 | } | |
175 | ||
176 | type_init(spapr_tpm_proxy_register_types) |