179 lines
4.7 KiB
C
179 lines
4.7 KiB
C
/*
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* SPAPR TPM Proxy/Hypercall
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*
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* Copyright IBM Corp. 2019
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*
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* Authors:
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* Michael Roth <mdroth@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "qapi/error.h"
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#include "qemu/error-report.h"
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#include "sysemu/reset.h"
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#include "cpu.h"
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#include "hw/ppc/spapr.h"
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#include "hw/qdev-properties.h"
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#include "trace.h"
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#define TPM_SPAPR_BUFSIZE 4096
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enum {
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TPM_COMM_OP_EXECUTE = 1,
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TPM_COMM_OP_CLOSE_SESSION = 2,
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};
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static void spapr_tpm_proxy_reset(void *opaque)
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{
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SpaprTpmProxy *tpm_proxy = SPAPR_TPM_PROXY(opaque);
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if (tpm_proxy->host_fd != -1) {
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close(tpm_proxy->host_fd);
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tpm_proxy->host_fd = -1;
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}
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}
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static ssize_t tpm_execute(SpaprTpmProxy *tpm_proxy, target_ulong *args)
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{
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uint64_t data_in = ppc64_phys_to_real(args[1]);
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target_ulong data_in_size = args[2];
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uint64_t data_out = ppc64_phys_to_real(args[3]);
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target_ulong data_out_size = args[4];
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uint8_t buf_in[TPM_SPAPR_BUFSIZE];
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uint8_t buf_out[TPM_SPAPR_BUFSIZE];
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ssize_t ret;
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trace_spapr_tpm_execute(data_in, data_in_size, data_out, data_out_size);
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if (data_in_size > TPM_SPAPR_BUFSIZE) {
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error_report("invalid TPM input buffer size: " TARGET_FMT_lu,
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data_in_size);
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return H_P3;
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}
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if (data_out_size < TPM_SPAPR_BUFSIZE) {
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error_report("invalid TPM output buffer size: " TARGET_FMT_lu,
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data_out_size);
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return H_P5;
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}
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if (tpm_proxy->host_fd == -1) {
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tpm_proxy->host_fd = open(tpm_proxy->host_path, O_RDWR);
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if (tpm_proxy->host_fd == -1) {
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error_report("failed to open TPM device %s: %d",
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tpm_proxy->host_path, errno);
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return H_RESOURCE;
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}
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}
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cpu_physical_memory_read(data_in, buf_in, data_in_size);
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do {
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ret = write(tpm_proxy->host_fd, buf_in, data_in_size);
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if (ret > 0) {
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data_in_size -= ret;
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}
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} while ((ret >= 0 && data_in_size > 0) || (ret == -1 && errno == EINTR));
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if (ret == -1) {
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error_report("failed to write to TPM device %s: %d",
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tpm_proxy->host_path, errno);
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return H_RESOURCE;
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}
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do {
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ret = read(tpm_proxy->host_fd, buf_out, data_out_size);
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} while (ret == 0 || (ret == -1 && errno == EINTR));
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if (ret == -1) {
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error_report("failed to read from TPM device %s: %d",
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tpm_proxy->host_path, errno);
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return H_RESOURCE;
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}
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cpu_physical_memory_write(data_out, buf_out, ret);
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args[0] = ret;
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return H_SUCCESS;
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}
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static target_ulong h_tpm_comm(PowerPCCPU *cpu,
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SpaprMachineState *spapr,
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target_ulong opcode,
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target_ulong *args)
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{
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target_ulong op = args[0];
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SpaprTpmProxy *tpm_proxy = spapr->tpm_proxy;
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if (!tpm_proxy) {
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error_report("TPM proxy not available");
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return H_FUNCTION;
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}
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trace_spapr_h_tpm_comm(tpm_proxy->host_path, op);
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switch (op) {
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case TPM_COMM_OP_EXECUTE:
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return tpm_execute(tpm_proxy, args);
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case TPM_COMM_OP_CLOSE_SESSION:
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spapr_tpm_proxy_reset(tpm_proxy);
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return H_SUCCESS;
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default:
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return H_PARAMETER;
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}
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}
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static void spapr_tpm_proxy_realize(DeviceState *d, Error **errp)
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{
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SpaprTpmProxy *tpm_proxy = SPAPR_TPM_PROXY(d);
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if (tpm_proxy->host_path == NULL) {
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error_setg(errp, "must specify 'host-path' option for device");
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return;
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}
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tpm_proxy->host_fd = -1;
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qemu_register_reset(spapr_tpm_proxy_reset, tpm_proxy);
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}
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static void spapr_tpm_proxy_unrealize(DeviceState *d, Error **errp)
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{
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SpaprTpmProxy *tpm_proxy = SPAPR_TPM_PROXY(d);
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qemu_unregister_reset(spapr_tpm_proxy_reset, tpm_proxy);
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}
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static Property spapr_tpm_proxy_properties[] = {
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DEFINE_PROP_STRING("host-path", SpaprTpmProxy, host_path),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void spapr_tpm_proxy_class_init(ObjectClass *k, void *data)
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{
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DeviceClass *dk = DEVICE_CLASS(k);
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dk->realize = spapr_tpm_proxy_realize;
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dk->unrealize = spapr_tpm_proxy_unrealize;
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dk->user_creatable = true;
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dk->props = spapr_tpm_proxy_properties;
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}
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static const TypeInfo spapr_tpm_proxy_info = {
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.name = TYPE_SPAPR_TPM_PROXY,
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.parent = TYPE_DEVICE,
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.instance_size = sizeof(SpaprTpmProxy),
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.class_init = spapr_tpm_proxy_class_init,
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};
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static void spapr_tpm_proxy_register_types(void)
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{
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type_register_static(&spapr_tpm_proxy_info);
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spapr_register_hypercall(SVM_H_TPM_COMM, h_tpm_comm);
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}
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type_init(spapr_tpm_proxy_register_types)
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