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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" | |
14 | #include "qemu-common.h" | |
15 | #include "qapi/error.h" | |
16 | #include "qemu/error-report.h" | |
17 | #include "sysemu/reset.h" | |
18 | #include "cpu.h" | |
19 | #include "hw/ppc/spapr.h" | |
20 | #include "hw/qdev-properties.h" | |
21 | #include "trace.h" | |
22 | ||
23 | #define TPM_SPAPR_BUFSIZE 4096 | |
24 | ||
25 | enum { | |
26 | TPM_COMM_OP_EXECUTE = 1, | |
27 | TPM_COMM_OP_CLOSE_SESSION = 2, | |
28 | }; | |
29 | ||
30 | static void spapr_tpm_proxy_reset(void *opaque) | |
31 | { | |
32 | SpaprTpmProxy *tpm_proxy = SPAPR_TPM_PROXY(opaque); | |
33 | ||
34 | if (tpm_proxy->host_fd != -1) { | |
35 | close(tpm_proxy->host_fd); | |
36 | tpm_proxy->host_fd = -1; | |
37 | } | |
38 | } | |
39 | ||
40 | static ssize_t tpm_execute(SpaprTpmProxy *tpm_proxy, target_ulong *args) | |
41 | { | |
42 | uint64_t data_in = ppc64_phys_to_real(args[1]); | |
43 | target_ulong data_in_size = args[2]; | |
44 | uint64_t data_out = ppc64_phys_to_real(args[3]); | |
45 | target_ulong data_out_size = args[4]; | |
46 | uint8_t buf_in[TPM_SPAPR_BUFSIZE]; | |
47 | uint8_t buf_out[TPM_SPAPR_BUFSIZE]; | |
48 | ssize_t ret; | |
49 | ||
50 | trace_spapr_tpm_execute(data_in, data_in_size, data_out, data_out_size); | |
51 | ||
52 | if (data_in_size > TPM_SPAPR_BUFSIZE) { | |
53 | error_report("invalid TPM input buffer size: " TARGET_FMT_lu, | |
54 | data_in_size); | |
55 | return H_P3; | |
56 | } | |
57 | ||
58 | if (data_out_size < TPM_SPAPR_BUFSIZE) { | |
59 | error_report("invalid TPM output buffer size: " TARGET_FMT_lu, | |
60 | data_out_size); | |
61 | return H_P5; | |
62 | } | |
63 | ||
64 | if (tpm_proxy->host_fd == -1) { | |
65 | tpm_proxy->host_fd = open(tpm_proxy->host_path, O_RDWR); | |
66 | if (tpm_proxy->host_fd == -1) { | |
67 | error_report("failed to open TPM device %s: %d", | |
68 | tpm_proxy->host_path, errno); | |
69 | return H_RESOURCE; | |
70 | } | |
71 | } | |
72 | ||
73 | cpu_physical_memory_read(data_in, buf_in, data_in_size); | |
74 | ||
75 | do { | |
76 | ret = write(tpm_proxy->host_fd, buf_in, data_in_size); | |
77 | if (ret > 0) { | |
78 | data_in_size -= ret; | |
79 | } | |
80 | } while ((ret >= 0 && data_in_size > 0) || (ret == -1 && errno == EINTR)); | |
81 | ||
82 | if (ret == -1) { | |
83 | error_report("failed to write to TPM device %s: %d", | |
84 | tpm_proxy->host_path, errno); | |
85 | return H_RESOURCE; | |
86 | } | |
87 | ||
88 | do { | |
89 | ret = read(tpm_proxy->host_fd, buf_out, data_out_size); | |
90 | } while (ret == 0 || (ret == -1 && errno == EINTR)); | |
91 | ||
92 | if (ret == -1) { | |
93 | error_report("failed to read from TPM device %s: %d", | |
94 | tpm_proxy->host_path, errno); | |
95 | return H_RESOURCE; | |
96 | } | |
97 | ||
98 | cpu_physical_memory_write(data_out, buf_out, ret); | |
99 | args[0] = ret; | |
100 | ||
101 | return H_SUCCESS; | |
102 | } | |
103 | ||
104 | static target_ulong h_tpm_comm(PowerPCCPU *cpu, | |
105 | SpaprMachineState *spapr, | |
106 | target_ulong opcode, | |
107 | target_ulong *args) | |
108 | { | |
109 | target_ulong op = args[0]; | |
110 | SpaprTpmProxy *tpm_proxy = spapr->tpm_proxy; | |
111 | ||
112 | if (!tpm_proxy) { | |
113 | error_report("TPM proxy not available"); | |
114 | return H_FUNCTION; | |
115 | } | |
116 | ||
226c9d15 | 117 | trace_spapr_h_tpm_comm(tpm_proxy->host_path, op); |
0fb6bd07 MR |
118 | |
119 | switch (op) { | |
120 | case TPM_COMM_OP_EXECUTE: | |
121 | return tpm_execute(tpm_proxy, args); | |
122 | case TPM_COMM_OP_CLOSE_SESSION: | |
123 | spapr_tpm_proxy_reset(tpm_proxy); | |
124 | return H_SUCCESS; | |
125 | default: | |
126 | return H_PARAMETER; | |
127 | } | |
128 | } | |
129 | ||
130 | static void spapr_tpm_proxy_realize(DeviceState *d, Error **errp) | |
131 | { | |
132 | SpaprTpmProxy *tpm_proxy = SPAPR_TPM_PROXY(d); | |
133 | ||
134 | if (tpm_proxy->host_path == NULL) { | |
135 | error_setg(errp, "must specify 'host-path' option for device"); | |
136 | return; | |
137 | } | |
138 | ||
139 | tpm_proxy->host_fd = -1; | |
140 | qemu_register_reset(spapr_tpm_proxy_reset, tpm_proxy); | |
141 | } | |
142 | ||
b69c3c21 | 143 | static void spapr_tpm_proxy_unrealize(DeviceState *d) |
0fb6bd07 MR |
144 | { |
145 | SpaprTpmProxy *tpm_proxy = SPAPR_TPM_PROXY(d); | |
146 | ||
147 | qemu_unregister_reset(spapr_tpm_proxy_reset, tpm_proxy); | |
148 | } | |
149 | ||
150 | static Property spapr_tpm_proxy_properties[] = { | |
151 | DEFINE_PROP_STRING("host-path", SpaprTpmProxy, host_path), | |
152 | DEFINE_PROP_END_OF_LIST(), | |
153 | }; | |
154 | ||
155 | static void spapr_tpm_proxy_class_init(ObjectClass *k, void *data) | |
156 | { | |
157 | DeviceClass *dk = DEVICE_CLASS(k); | |
158 | ||
159 | dk->realize = spapr_tpm_proxy_realize; | |
160 | dk->unrealize = spapr_tpm_proxy_unrealize; | |
161 | dk->user_creatable = true; | |
4f67d30b | 162 | device_class_set_props(dk, spapr_tpm_proxy_properties); |
0fb6bd07 MR |
163 | } |
164 | ||
165 | static const TypeInfo spapr_tpm_proxy_info = { | |
166 | .name = TYPE_SPAPR_TPM_PROXY, | |
167 | .parent = TYPE_DEVICE, | |
168 | .instance_size = sizeof(SpaprTpmProxy), | |
169 | .class_init = spapr_tpm_proxy_class_init, | |
170 | }; | |
171 | ||
172 | static void spapr_tpm_proxy_register_types(void) | |
173 | { | |
174 | type_register_static(&spapr_tpm_proxy_info); | |
175 | spapr_register_hypercall(SVM_H_TPM_COMM, h_tpm_comm); | |
176 | } | |
177 | ||
178 | type_init(spapr_tpm_proxy_register_types) |