189 lines
4.6 KiB
C
189 lines
4.6 KiB
C
/*-
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* Copyright (c) 2014 Nahanni Systems Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* virtio entropy device emulation.
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* Randomness is sourced from /dev/random which does not block
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* once it has been seeded at bootup.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/linker_set.h>
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#include <sys/uio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <assert.h>
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#include <pthread.h>
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#include "bhyverun.h"
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#include "pci_emul.h"
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#include "virtio.h"
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#define VTRND_RINGSZ 64
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static int pci_vtrnd_debug;
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#define DPRINTF(params) if (pci_vtrnd_debug) printf params
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#define WPRINTF(params) printf params
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/*
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* Per-device softc
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*/
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struct pci_vtrnd_softc {
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struct virtio_softc vrsc_vs;
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struct vqueue_info vrsc_vq;
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pthread_mutex_t vrsc_mtx;
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uint64_t vrsc_cfg;
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int vrsc_fd;
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};
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static void pci_vtrnd_reset(void *);
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static void pci_vtrnd_notify(void *, struct vqueue_info *);
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static struct virtio_consts vtrnd_vi_consts = {
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"vtrnd", /* our name */
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1, /* we support 1 virtqueue */
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0, /* config reg size */
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pci_vtrnd_reset, /* reset */
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pci_vtrnd_notify, /* device-wide qnotify */
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NULL, /* read virtio config */
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NULL, /* write virtio config */
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0, /* our capabilities */
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};
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static void
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pci_vtrnd_reset(void *vsc)
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{
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struct pci_vtrnd_softc *sc;
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sc = vsc;
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DPRINTF(("vtrnd: device reset requested !\n"));
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vi_reset_dev(&sc->vrsc_vs);
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}
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static void
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pci_vtrnd_notify(void *vsc, struct vqueue_info *vq)
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{
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struct iovec iov;
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struct pci_vtrnd_softc *sc;
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int len;
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sc = vsc;
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vq_startchains(vq);
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if (sc->vrsc_fd < 0) {
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vq_endchains(vq, 0);
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return;
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}
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while (vq_has_descs(vq)) {
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vq_getchain(vq, &iov, 1, NULL);
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len = read(sc->vrsc_fd, iov.iov_base, iov.iov_len);
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DPRINTF(("vtrnd: vtrnd_notify(): %d\r\n", len));
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/* Catastrophe if unable to read from /dev/random */
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assert(len > 0);
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/*
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* Release this chain and handle more
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*/
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vq_relchain(vq, len);
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}
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vq_endchains(vq, 1); /* Generate interrupt if appropriate. */
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}
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static int
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pci_vtrnd_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts)
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{
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struct pci_vtrnd_softc *sc;
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int fd;
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int len;
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uint8_t v;
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/*
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* Should always be able to open /dev/random.
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*/
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fd = open("/dev/random", O_RDONLY | O_NONBLOCK);
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assert(fd >= 0);
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/*
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* Check that device is seeded and non-blocking.
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*/
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len = read(fd, &v, sizeof(v));
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if (len <= 0) {
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WPRINTF(("vtrnd: /dev/random not ready, read(): %d", len));
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return (1);
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}
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sc = calloc(1, sizeof(struct pci_vtrnd_softc));
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vi_softc_linkup(&sc->vrsc_vs, &vtrnd_vi_consts, sc, pi, &sc->vrsc_vq);
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sc->vrsc_vs.vs_mtx = &sc->vrsc_mtx;
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sc->vrsc_vq.vq_qsize = VTRND_RINGSZ;
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/* keep /dev/random opened while emulating */
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sc->vrsc_fd = fd;
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/* initialize config space */
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pci_set_cfgdata16(pi, PCIR_DEVICE, VIRTIO_DEV_RANDOM);
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pci_set_cfgdata16(pi, PCIR_VENDOR, VIRTIO_VENDOR);
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pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_CRYPTO);
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pci_set_cfgdata16(pi, PCIR_SUBDEV_0, VIRTIO_TYPE_ENTROPY);
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if (vi_intr_init(&sc->vrsc_vs, 1, fbsdrun_virtio_msix()))
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return (1);
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vi_set_io_bar(&sc->vrsc_vs, 0);
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return (0);
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}
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struct pci_devemu pci_de_vrnd = {
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.pe_emu = "virtio-rnd",
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.pe_init = pci_vtrnd_init,
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.pe_barwrite = vi_pci_write,
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.pe_barread = vi_pci_read
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};
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PCI_EMUL_SET(pci_de_vrnd);
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