cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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hostmem-epc.c (2101B)

      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 "qemu-common.h"
     16#include "qom/object_interfaces.h"
     17#include "qapi/error.h"
     18#include "sysemu/hostmem.h"
     19#include "hw/i386/hostmem-epc.h"
     20
     21static void
     22sgx_epc_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
     23{
     24    uint32_t ram_flags;
     25    char *name;
     26    int fd;
     27
     28    if (!backend->size) {
     29        error_setg(errp, "can't create backend with size 0");
     30        return;
     31    }
     32
     33    fd = qemu_open_old("/dev/sgx_vepc", O_RDWR);
     34    if (fd < 0) {
     35        error_setg_errno(errp, errno,
     36                         "failed to open /dev/sgx_vepc to alloc SGX EPC");
     37        return;
     38    }
     39
     40    name = object_get_canonical_path(OBJECT(backend));
     41    ram_flags = (backend->share ? RAM_SHARED : 0) | RAM_PROTECTED;
     42    memory_region_init_ram_from_fd(&backend->mr, OBJECT(backend),
     43                                   name, backend->size, ram_flags,
     44                                   fd, 0, errp);
     45    g_free(name);
     46}
     47
     48static void sgx_epc_backend_instance_init(Object *obj)
     49{
     50    HostMemoryBackend *m = MEMORY_BACKEND(obj);
     51
     52    m->share = true;
     53    m->merge = false;
     54    m->dump = false;
     55}
     56
     57static void sgx_epc_backend_class_init(ObjectClass *oc, void *data)
     58{
     59    HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
     60
     61    bc->alloc = sgx_epc_backend_memory_alloc;
     62}
     63
     64static const TypeInfo sgx_epc_backed_info = {
     65    .name = TYPE_MEMORY_BACKEND_EPC,
     66    .parent = TYPE_MEMORY_BACKEND,
     67    .instance_init = sgx_epc_backend_instance_init,
     68    .class_init = sgx_epc_backend_class_init,
     69    .instance_size = sizeof(HostMemoryBackendEpc),
     70};
     71
     72static void register_types(void)
     73{
     74    int fd = qemu_open_old("/dev/sgx_vepc", O_RDWR);
     75    if (fd >= 0) {
     76        close(fd);
     77
     78        type_register_static(&sgx_epc_backed_info);
     79    }
     80}
     81
     82type_init(register_types);