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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udmabuf.c (588B)

      1/*
      2 * udmabuf helper functions.
      3 *
      4 * This work is licensed under the terms of the GNU GPL, version 2 or later.
      5 * See the COPYING file in the top-level directory.
      6 */
      7#include "qemu/osdep.h"
      8#include "qapi/error.h"
      9#include "ui/console.h"
     10
     11#include <fcntl.h>
     12#include <sys/ioctl.h>
     13
     14int udmabuf_fd(void)
     15{
     16    static bool first = true;
     17    static int udmabuf;
     18
     19    if (!first) {
     20        return udmabuf;
     21    }
     22    first = false;
     23
     24    udmabuf = open("/dev/udmabuf", O_RDWR);
     25    if (udmabuf < 0) {
     26        warn_report("open /dev/udmabuf: %s", strerror(errno));
     27    }
     28    return udmabuf;
     29}