qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
Log | Files | Refs | Submodules | LICENSE

hostmem-epc.c (2076B)

      1 /*
      2  * QEMU host SGX EPC memory backend
      3  *
      4  * Copyright (C) 2019 Intel Corporation
      5  *
      6  * Authors:
      7  *   Sean Christopherson <sean.j.christopherson@intel.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 #include <sys/ioctl.h>
     13 
     14 #include "qemu/osdep.h"
     15 #include "qom/object_interfaces.h"
     16 #include "qapi/error.h"
     17 #include "sysemu/hostmem.h"
     18 #include "hw/i386/hostmem-epc.h"
     19 
     20 static void
     21 sgx_epc_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
     22 {
     23     uint32_t ram_flags;
     24     char *name;
     25     int fd;
     26 
     27     if (!backend->size) {
     28         error_setg(errp, "can't create backend with size 0");
     29         return;
     30     }
     31 
     32     fd = qemu_open_old("/dev/sgx_vepc", O_RDWR);
     33     if (fd < 0) {
     34         error_setg_errno(errp, errno,
     35                          "failed to open /dev/sgx_vepc to alloc SGX EPC");
     36         return;
     37     }
     38 
     39     name = object_get_canonical_path(OBJECT(backend));
     40     ram_flags = (backend->share ? RAM_SHARED : 0) | RAM_PROTECTED;
     41     memory_region_init_ram_from_fd(&backend->mr, OBJECT(backend),
     42                                    name, backend->size, ram_flags,
     43                                    fd, 0, errp);
     44     g_free(name);
     45 }
     46 
     47 static void sgx_epc_backend_instance_init(Object *obj)
     48 {
     49     HostMemoryBackend *m = MEMORY_BACKEND(obj);
     50 
     51     m->share = true;
     52     m->merge = false;
     53     m->dump = false;
     54 }
     55 
     56 static void sgx_epc_backend_class_init(ObjectClass *oc, void *data)
     57 {
     58     HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
     59 
     60     bc->alloc = sgx_epc_backend_memory_alloc;
     61 }
     62 
     63 static const TypeInfo sgx_epc_backed_info = {
     64     .name = TYPE_MEMORY_BACKEND_EPC,
     65     .parent = TYPE_MEMORY_BACKEND,
     66     .instance_init = sgx_epc_backend_instance_init,
     67     .class_init = sgx_epc_backend_class_init,
     68     .instance_size = sizeof(HostMemoryBackendEpc),
     69 };
     70 
     71 static void register_types(void)
     72 {
     73     int fd = qemu_open_old("/dev/sgx_vepc", O_RDWR);
     74     if (fd >= 0) {
     75         close(fd);
     76 
     77         type_register_static(&sgx_epc_backed_info);
     78     }
     79 }
     80 
     81 type_init(register_types);