diff options
Diffstat (limited to 'qemu/hw/ppc/spapr_rng.c')
| -rw-r--r-- | qemu/hw/ppc/spapr_rng.c | 191 |
1 files changed, 0 insertions, 191 deletions
diff --git a/qemu/hw/ppc/spapr_rng.c b/qemu/hw/ppc/spapr_rng.c deleted file mode 100644 index 80515eb54..000000000 --- a/qemu/hw/ppc/spapr_rng.c +++ /dev/null @@ -1,191 +0,0 @@ -/* - * QEMU sPAPR random number generator "device" for H_RANDOM hypercall - * - * Copyright 2015 Thomas Huth, Red Hat Inc. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, - * or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, see <http://www.gnu.org/licenses/>. - */ - -#include "qemu/osdep.h" -#include "qapi/error.h" -#include "qemu-common.h" -#include "cpu.h" -#include "qemu/error-report.h" -#include "sysemu/sysemu.h" -#include "sysemu/device_tree.h" -#include "sysemu/rng.h" -#include "hw/ppc/spapr.h" -#include "kvm_ppc.h" - -#define SPAPR_RNG(obj) \ - OBJECT_CHECK(sPAPRRngState, (obj), TYPE_SPAPR_RNG) - -struct sPAPRRngState { - /*< private >*/ - DeviceState ds; - RngBackend *backend; - bool use_kvm; -}; -typedef struct sPAPRRngState sPAPRRngState; - -struct HRandomData { - QemuSemaphore sem; - union { - uint64_t v64; - uint8_t v8[8]; - } val; - int received; -}; -typedef struct HRandomData HRandomData; - -/* Callback function for the RngBackend */ -static void random_recv(void *dest, const void *src, size_t size) -{ - HRandomData *hrdp = dest; - - if (src && size > 0) { - assert(size + hrdp->received <= sizeof(hrdp->val.v8)); - memcpy(&hrdp->val.v8[hrdp->received], src, size); - hrdp->received += size; - } - - qemu_sem_post(&hrdp->sem); -} - -/* Handler for the H_RANDOM hypercall */ -static target_ulong h_random(PowerPCCPU *cpu, sPAPRMachineState *spapr, - target_ulong opcode, target_ulong *args) -{ - sPAPRRngState *rngstate; - HRandomData hrdata; - - rngstate = SPAPR_RNG(object_resolve_path_type("", TYPE_SPAPR_RNG, NULL)); - - if (!rngstate || !rngstate->backend) { - return H_HARDWARE; - } - - qemu_sem_init(&hrdata.sem, 0); - hrdata.val.v64 = 0; - hrdata.received = 0; - - while (hrdata.received < 8) { - rng_backend_request_entropy(rngstate->backend, 8 - hrdata.received, - random_recv, &hrdata); - qemu_mutex_unlock_iothread(); - qemu_sem_wait(&hrdata.sem); - qemu_mutex_lock_iothread(); - } - - qemu_sem_destroy(&hrdata.sem); - args[0] = hrdata.val.v64; - - return H_SUCCESS; -} - -static void spapr_rng_instance_init(Object *obj) -{ - sPAPRRngState *rngstate = SPAPR_RNG(obj); - - if (object_resolve_path_type("", TYPE_SPAPR_RNG, NULL) != NULL) { - error_report("spapr-rng can not be instantiated twice!"); - return; - } - - object_property_add_link(obj, "rng", TYPE_RNG_BACKEND, - (Object **)&rngstate->backend, - object_property_allow_set_link, - OBJ_PROP_LINK_UNREF_ON_RELEASE, NULL); - object_property_set_description(obj, "rng", - "ID of the random number generator backend", - NULL); -} - -static void spapr_rng_realize(DeviceState *dev, Error **errp) -{ - - sPAPRRngState *rngstate = SPAPR_RNG(dev); - - if (rngstate->use_kvm) { - if (kvmppc_enable_hwrng() == 0) { - return; - } - /* - * If user specified both, use-kvm and a backend, we fall back to - * the backend now. If not, provide an appropriate error message. - */ - if (!rngstate->backend) { - error_setg(errp, "Could not initialize in-kernel H_RANDOM call!"); - return; - } - } - - if (rngstate->backend) { - spapr_register_hypercall(H_RANDOM, h_random); - } else { - error_setg(errp, "spapr-rng needs an RNG backend!"); - } -} - -int spapr_rng_populate_dt(void *fdt) -{ - int node; - int ret; - - node = qemu_fdt_add_subnode(fdt, "/ibm,platform-facilities"); - if (node <= 0) { - return -1; - } - ret = fdt_setprop_string(fdt, node, "device_type", - "ibm,platform-facilities"); - ret |= fdt_setprop_cell(fdt, node, "#address-cells", 0x1); - ret |= fdt_setprop_cell(fdt, node, "#size-cells", 0x0); - - node = fdt_add_subnode(fdt, node, "ibm,random-v1"); - if (node <= 0) { - return -1; - } - ret |= fdt_setprop_string(fdt, node, "compatible", "ibm,random"); - - return ret ? -1 : 0; -} - -static Property spapr_rng_properties[] = { - DEFINE_PROP_BOOL("use-kvm", sPAPRRngState, use_kvm, false), - DEFINE_PROP_END_OF_LIST(), -}; - -static void spapr_rng_class_init(ObjectClass *oc, void *data) -{ - DeviceClass *dc = DEVICE_CLASS(oc); - - dc->realize = spapr_rng_realize; - set_bit(DEVICE_CATEGORY_MISC, dc->categories); - dc->props = spapr_rng_properties; - dc->hotpluggable = false; -} - -static const TypeInfo spapr_rng_info = { - .name = TYPE_SPAPR_RNG, - .parent = TYPE_DEVICE, - .instance_size = sizeof(sPAPRRngState), - .instance_init = spapr_rng_instance_init, - .class_init = spapr_rng_class_init, -}; - -static void spapr_rng_register_type(void) -{ - type_register_static(&spapr_rng_info); -} -type_init(spapr_rng_register_type) |