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usr.sbin/bhyve/mmio/mmio_virtio_rnd.c
- This file was added.
/*- | |||||
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD | |||||
* | |||||
* Copyright (c) 2014 Nahanni Systems Inc. | |||||
* All rights reserved. | |||||
* | |||||
* Redistribution and use in source and binary forms, with or without | |||||
* modification, are permitted provided that the following conditions | |||||
* are met: | |||||
* 1. Redistributions of source code must retain the above copyright | |||||
* notice, this list of conditions and the following disclaimer | |||||
* in this position and unchanged. | |||||
* 2. Redistributions in binary form must reproduce the above copyright | |||||
* notice, this list of conditions and the following disclaimer in the | |||||
* documentation and/or other materials provided with the distribution. | |||||
* | |||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |||||
* SUCH DAMAGE. | |||||
*/ | |||||
/* | |||||
* virtio entropy device emulation. | |||||
* Randomness is sourced from /dev/random which does not block | |||||
* once it has been seeded at bootup. | |||||
*/ | |||||
#include <sys/cdefs.h> | |||||
__FBSDID("$FreeBSD$"); | |||||
#include <sys/param.h> | |||||
#ifndef WITHOUT_CAPSICUM | |||||
#include <sys/capsicum.h> | |||||
#endif | |||||
#include <sys/linker_set.h> | |||||
#include <sys/uio.h> | |||||
#ifndef WITHOUT_CAPSICUM | |||||
#include <capsicum_helpers.h> | |||||
#endif | |||||
#include <err.h> | |||||
#include <errno.h> | |||||
#include <fcntl.h> | |||||
#include <stdio.h> | |||||
#include <stdlib.h> | |||||
#include <string.h> | |||||
#include <unistd.h> | |||||
#include <assert.h> | |||||
#include <pthread.h> | |||||
#include <dev/pci/pcireg.h> | |||||
#include <sysexits.h> | |||||
#include "bhyverun.h" | |||||
#include "debug.h" | |||||
#include "mmio_emul.h" | |||||
#include "mmio_virtio.h" | |||||
#define VTRND_RINGSZ 64 | |||||
static int pci_vtrnd_debug; | |||||
#define DPRINTF(params) if (pci_vtrnd_debug) PRINTLN params | |||||
#define WPRINTF(params) PRINTLN params | |||||
/* | |||||
* Per-device softc | |||||
*/ | |||||
struct pci_vtrnd_softc { | |||||
struct virtio_softc vrsc_vs; | |||||
struct vqueue_info vrsc_vq; | |||||
pthread_mutex_t vrsc_mtx; | |||||
uint64_t vrsc_cfg; | |||||
int vrsc_fd; | |||||
}; | |||||
static void pci_vtrnd_reset(void *); | |||||
static void pci_vtrnd_notify(void *, struct vqueue_info *); | |||||
static struct virtio_consts vtrnd_vi_consts = { | |||||
"vtrnd", /* our name */ | |||||
1, /* we support 1 virtqueue */ | |||||
0, /* config reg size */ | |||||
pci_vtrnd_reset, /* reset */ | |||||
pci_vtrnd_notify, /* device-wide qnotify */ | |||||
NULL, /* read virtio config */ | |||||
NULL, /* write virtio config */ | |||||
NULL, /* apply negotiated features */ | |||||
0, /* our capabilities */ | |||||
}; | |||||
static void | |||||
pci_vtrnd_reset(void *vsc) | |||||
{ | |||||
struct pci_vtrnd_softc *sc; | |||||
sc = vsc; | |||||
DPRINTF(("vtrnd: device reset requested !")); | |||||
vi_reset_dev(&sc->vrsc_vs); | |||||
} | |||||
static void | |||||
pci_vtrnd_notify(void *vsc, struct vqueue_info *vq) | |||||
{ | |||||
struct iovec iov; | |||||
struct pci_vtrnd_softc *sc; | |||||
int len; | |||||
uint16_t idx; | |||||
sc = vsc; | |||||
if (sc->vrsc_fd < 0) { | |||||
vq_endchains(vq, 0); | |||||
return; | |||||
} | |||||
while (vq_has_descs(vq)) { | |||||
vq_getchain(vq, &idx, &iov, 1, NULL); | |||||
len = read(sc->vrsc_fd, iov.iov_base, iov.iov_len); | |||||
DPRINTF(("vtrnd: vtrnd_notify(): %d", len)); | |||||
/* Catastrophe if unable to read from /dev/random */ | |||||
assert(len > 0); | |||||
/* | |||||
* Release this chain and handle more | |||||
*/ | |||||
vq_relchain(vq, idx, len); | |||||
} | |||||
vq_endchains(vq, 1); /* Generate interrupt if appropriate. */ | |||||
} | |||||
static int | |||||
pci_vtrnd_init(struct vmctx *ctx, struct mmio_devinst *pi, char *opts) | |||||
{ | |||||
struct pci_vtrnd_softc *sc; | |||||
int fd; | |||||
int len; | |||||
uint8_t v; | |||||
#ifndef WITHOUT_CAPSICUM | |||||
cap_rights_t rights; | |||||
#endif | |||||
/* | |||||
* Should always be able to open /dev/random. | |||||
*/ | |||||
fd = open("/dev/random", O_RDONLY | O_NONBLOCK); | |||||
assert(fd >= 0); | |||||
#ifndef WITHOUT_CAPSICUM | |||||
cap_rights_init(&rights, CAP_READ); | |||||
if (caph_rights_limit(fd, &rights) == -1) | |||||
errx(EX_OSERR, "Unable to apply rights for sandbox"); | |||||
#endif | |||||
/* | |||||
* Check that device is seeded and non-blocking. | |||||
*/ | |||||
len = read(fd, &v, sizeof(v)); | |||||
if (len <= 0) { | |||||
WPRINTF(("vtrnd: /dev/random not ready, read(): %d", len)); | |||||
close(fd); | |||||
return (1); | |||||
} | |||||
sc = calloc(1, sizeof(struct pci_vtrnd_softc)); | |||||
vi_softc_linkup(&sc->vrsc_vs, &vtrnd_vi_consts, sc, pi, &sc->vrsc_vq); | |||||
sc->vrsc_vs.vs_mtx = &sc->vrsc_mtx; | |||||
sc->vrsc_vq.vq_qsize = VTRND_RINGSZ; | |||||
/* keep /dev/random opened while emulating */ | |||||
sc->vrsc_fd = fd; | |||||
/* initialize config space */ | |||||
vi_devemu_init(pi, VIRTIO_TYPE_ENTROPY); | |||||
if (vi_intr_init(&sc->vrsc_vs, 1, fbsdrun_virtio_msix())) | |||||
return (1); | |||||
vi_set_io_res(&sc->vrsc_vs, 0); | |||||
return (0); | |||||
} | |||||
struct mmio_devemu pci_de_vrnd = { | |||||
.de_emu = "virtio-rnd", | |||||
.de_init = pci_vtrnd_init, | |||||
.de_write = vi_mmio_write, | |||||
.de_read = vi_mmio_read | |||||
}; | |||||
MMIO_EMUL_SET(pci_de_vrnd); |