965 lines
25 KiB
C
965 lines
25 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2013 Chris Torek <torek @ torek net>
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* All rights reserved.
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* Copyright (c) 2019 Joyent, Inc.
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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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* 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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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/uio.h>
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#include <machine/atomic.h>
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#include <dev/virtio/pci/virtio_pci_legacy_var.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <pthread.h>
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#include <pthread_np.h>
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#include "bhyverun.h"
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#include "debug.h"
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#include "pci_emul.h"
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#ifdef BHYVE_SNAPSHOT
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#include "snapshot.h"
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#endif
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#include "virtio.h"
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/*
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* Functions for dealing with generalized "virtual devices" as
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* defined by <https://www.google.com/#output=search&q=virtio+spec>
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*/
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/*
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* In case we decide to relax the "virtio softc comes at the
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* front of virtio-based device softc" constraint, let's use
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* this to convert.
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*/
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#define DEV_SOFTC(vs) ((void *)(vs))
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/*
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* Link a virtio_softc to its constants, the device softc, and
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* the PCI emulation.
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*/
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void
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vi_softc_linkup(struct virtio_softc *vs, struct virtio_consts *vc,
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void *dev_softc, struct pci_devinst *pi,
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struct vqueue_info *queues)
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{
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int i;
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/* vs and dev_softc addresses must match */
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assert((void *)vs == dev_softc);
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vs->vs_vc = vc;
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vs->vs_pi = pi;
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pi->pi_arg = vs;
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vs->vs_queues = queues;
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for (i = 0; i < vc->vc_nvq; i++) {
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queues[i].vq_vs = vs;
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queues[i].vq_num = i;
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}
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}
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/*
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* Reset device (device-wide). This erases all queues, i.e.,
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* all the queues become invalid (though we don't wipe out the
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* internal pointers, we just clear the VQ_ALLOC flag).
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*
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* It resets negotiated features to "none".
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*
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* If MSI-X is enabled, this also resets all the vectors to NO_VECTOR.
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*/
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void
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vi_reset_dev(struct virtio_softc *vs)
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{
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struct vqueue_info *vq;
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int i, nvq;
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if (vs->vs_mtx)
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assert(pthread_mutex_isowned_np(vs->vs_mtx));
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nvq = vs->vs_vc->vc_nvq;
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for (vq = vs->vs_queues, i = 0; i < nvq; vq++, i++) {
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vq->vq_flags = 0;
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vq->vq_last_avail = 0;
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vq->vq_next_used = 0;
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vq->vq_save_used = 0;
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vq->vq_pfn = 0;
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vq->vq_msix_idx = VIRTIO_MSI_NO_VECTOR;
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}
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vs->vs_negotiated_caps = 0;
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vs->vs_curq = 0;
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/* vs->vs_status = 0; -- redundant */
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if (vs->vs_isr)
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pci_lintr_deassert(vs->vs_pi);
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vs->vs_isr = 0;
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vs->vs_msix_cfg_idx = VIRTIO_MSI_NO_VECTOR;
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}
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/*
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* Set I/O BAR (usually 0) to map PCI config registers.
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*/
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void
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vi_set_io_bar(struct virtio_softc *vs, int barnum)
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{
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size_t size;
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/*
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* ??? should we use VIRTIO_PCI_CONFIG_OFF(0) if MSI-X is disabled?
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* Existing code did not...
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*/
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size = VIRTIO_PCI_CONFIG_OFF(1) + vs->vs_vc->vc_cfgsize;
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pci_emul_alloc_bar(vs->vs_pi, barnum, PCIBAR_IO, size);
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}
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/*
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* Initialize MSI-X vector capabilities if we're to use MSI-X,
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* or MSI capabilities if not.
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*
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* We assume we want one MSI-X vector per queue, here, plus one
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* for the config vec.
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*/
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int
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vi_intr_init(struct virtio_softc *vs, int barnum, int use_msix)
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{
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int nvec;
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if (use_msix) {
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vs->vs_flags |= VIRTIO_USE_MSIX;
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VS_LOCK(vs);
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vi_reset_dev(vs); /* set all vectors to NO_VECTOR */
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VS_UNLOCK(vs);
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nvec = vs->vs_vc->vc_nvq + 1;
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if (pci_emul_add_msixcap(vs->vs_pi, nvec, barnum))
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return (1);
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} else
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vs->vs_flags &= ~VIRTIO_USE_MSIX;
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/* Only 1 MSI vector for bhyve */
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pci_emul_add_msicap(vs->vs_pi, 1);
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/* Legacy interrupts are mandatory for virtio devices */
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pci_lintr_request(vs->vs_pi);
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return (0);
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}
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/*
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* Initialize the currently-selected virtio queue (vs->vs_curq).
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* The guest just gave us a page frame number, from which we can
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* calculate the addresses of the queue.
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*/
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static void
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vi_vq_init(struct virtio_softc *vs, uint32_t pfn)
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{
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struct vqueue_info *vq;
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uint64_t phys;
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size_t size;
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char *base;
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vq = &vs->vs_queues[vs->vs_curq];
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vq->vq_pfn = pfn;
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phys = (uint64_t)pfn << VRING_PFN;
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size = vring_size_aligned(vq->vq_qsize);
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base = paddr_guest2host(vs->vs_pi->pi_vmctx, phys, size);
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/* First page(s) are descriptors... */
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vq->vq_desc = (struct vring_desc *)base;
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base += vq->vq_qsize * sizeof(struct vring_desc);
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/* ... immediately followed by "avail" ring (entirely uint16_t's) */
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vq->vq_avail = (struct vring_avail *)base;
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base += (2 + vq->vq_qsize + 1) * sizeof(uint16_t);
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/* Then it's rounded up to the next page... */
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base = (char *)roundup2((uintptr_t)base, VRING_ALIGN);
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/* ... and the last page(s) are the used ring. */
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vq->vq_used = (struct vring_used *)base;
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/* Mark queue as allocated, and start at 0 when we use it. */
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vq->vq_flags = VQ_ALLOC;
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vq->vq_last_avail = 0;
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vq->vq_next_used = 0;
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vq->vq_save_used = 0;
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}
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/*
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* Helper inline for vq_getchain(): record the i'th "real"
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* descriptor.
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*/
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static inline void
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_vq_record(int i, struct vring_desc *vd, struct vmctx *ctx, struct iovec *iov,
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int n_iov, struct vi_req *reqp)
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{
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if (i >= n_iov)
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return;
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iov[i].iov_base = paddr_guest2host(ctx, vd->addr, vd->len);
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iov[i].iov_len = vd->len;
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if ((vd->flags & VRING_DESC_F_WRITE) == 0)
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reqp->readable++;
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else
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reqp->writable++;
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}
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#define VQ_MAX_DESCRIPTORS 512 /* see below */
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/*
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* Examine the chain of descriptors starting at the "next one" to
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* make sure that they describe a sensible request. If so, return
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* the number of "real" descriptors that would be needed/used in
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* acting on this request. This may be smaller than the number of
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* available descriptors, e.g., if there are two available but
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* they are two separate requests, this just returns 1. Or, it
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* may be larger: if there are indirect descriptors involved,
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* there may only be one descriptor available but it may be an
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* indirect pointing to eight more. We return 8 in this case,
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* i.e., we do not count the indirect descriptors, only the "real"
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* ones.
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*
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* Basically, this vets the "flags" and "next" field of each
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* descriptor and tells you how many are involved. Since some may
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* be indirect, this also needs the vmctx (in the pci_devinst
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* at vs->vs_pi) so that it can find indirect descriptors.
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*
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* As we process each descriptor, we copy and adjust it (guest to
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* host address wise, also using the vmtctx) into the given iov[]
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* array (of the given size). If the array overflows, we stop
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* placing values into the array but keep processing descriptors,
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* up to VQ_MAX_DESCRIPTORS, before giving up and returning -1.
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* So you, the caller, must not assume that iov[] is as big as the
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* return value (you can process the same thing twice to allocate
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* a larger iov array if needed, or supply a zero length to find
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* out how much space is needed).
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*
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* If some descriptor(s) are invalid, this prints a diagnostic message
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* and returns -1. If no descriptors are ready now it simply returns 0.
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*
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* You are assumed to have done a vq_ring_ready() if needed (note
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* that vq_has_descs() does one).
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*/
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int
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vq_getchain(struct vqueue_info *vq, struct iovec *iov, int niov,
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struct vi_req *reqp)
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{
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int i;
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u_int ndesc, n_indir;
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u_int idx, next;
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struct vi_req req;
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struct vring_desc *vdir, *vindir, *vp;
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struct vmctx *ctx;
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struct virtio_softc *vs;
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const char *name;
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vs = vq->vq_vs;
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name = vs->vs_vc->vc_name;
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memset(&req, 0, sizeof(req));
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/*
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* Note: it's the responsibility of the guest not to
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* update vq->vq_avail->idx until all of the descriptors
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* the guest has written are valid (including all their
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* "next" fields and "flags").
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*
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* Compute (vq_avail->idx - last_avail) in integers mod 2**16. This is
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* the number of descriptors the device has made available
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* since the last time we updated vq->vq_last_avail.
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*
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* We just need to do the subtraction as an unsigned int,
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* then trim off excess bits.
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*/
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idx = vq->vq_last_avail;
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ndesc = (uint16_t)((u_int)vq->vq_avail->idx - idx);
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if (ndesc == 0)
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return (0);
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if (ndesc > vq->vq_qsize) {
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/* XXX need better way to diagnose issues */
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EPRINTLN(
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"%s: ndesc (%u) out of range, driver confused?",
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name, (u_int)ndesc);
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return (-1);
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}
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/*
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* Now count/parse "involved" descriptors starting from
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* the head of the chain.
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*
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* To prevent loops, we could be more complicated and
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* check whether we're re-visiting a previously visited
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* index, but we just abort if the count gets excessive.
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*/
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ctx = vs->vs_pi->pi_vmctx;
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req.idx = next = vq->vq_avail->ring[idx & (vq->vq_qsize - 1)];
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vq->vq_last_avail++;
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for (i = 0; i < VQ_MAX_DESCRIPTORS; next = vdir->next) {
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if (next >= vq->vq_qsize) {
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EPRINTLN(
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"%s: descriptor index %u out of range, "
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"driver confused?",
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name, next);
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return (-1);
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}
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vdir = &vq->vq_desc[next];
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if ((vdir->flags & VRING_DESC_F_INDIRECT) == 0) {
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_vq_record(i, vdir, ctx, iov, niov, &req);
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i++;
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} else if ((vs->vs_vc->vc_hv_caps &
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VIRTIO_RING_F_INDIRECT_DESC) == 0) {
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EPRINTLN(
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"%s: descriptor has forbidden INDIRECT flag, "
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"driver confused?",
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name);
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return (-1);
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} else {
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n_indir = vdir->len / 16;
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if ((vdir->len & 0xf) || n_indir == 0) {
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EPRINTLN(
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"%s: invalid indir len 0x%x, "
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"driver confused?",
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name, (u_int)vdir->len);
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return (-1);
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}
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vindir = paddr_guest2host(ctx,
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vdir->addr, vdir->len);
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/*
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* Indirects start at the 0th, then follow
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* their own embedded "next"s until those run
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* out. Each one's indirect flag must be off
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* (we don't really have to check, could just
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* ignore errors...).
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*/
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next = 0;
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for (;;) {
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vp = &vindir[next];
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if (vp->flags & VRING_DESC_F_INDIRECT) {
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EPRINTLN(
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"%s: indirect desc has INDIR flag,"
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" driver confused?",
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name);
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return (-1);
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}
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_vq_record(i, vp, ctx, iov, niov, &req);
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if (++i > VQ_MAX_DESCRIPTORS)
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goto loopy;
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if ((vp->flags & VRING_DESC_F_NEXT) == 0)
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break;
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next = vp->next;
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if (next >= n_indir) {
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EPRINTLN(
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"%s: invalid next %u > %u, "
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"driver confused?",
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name, (u_int)next, n_indir);
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return (-1);
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}
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}
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}
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if ((vdir->flags & VRING_DESC_F_NEXT) == 0)
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goto done;
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}
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loopy:
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EPRINTLN(
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"%s: descriptor loop? count > %d - driver confused?",
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name, i);
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return (-1);
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done:
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*reqp = req;
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return (i);
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}
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/*
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* Return the first n_chain request chains back to the available queue.
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*
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* (These chains are the ones you handled when you called vq_getchain()
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* and used its positive return value.)
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*/
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void
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vq_retchains(struct vqueue_info *vq, uint16_t n_chains)
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{
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vq->vq_last_avail -= n_chains;
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}
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void
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vq_relchain_prepare(struct vqueue_info *vq, uint16_t idx, uint32_t iolen)
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{
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struct vring_used *vuh;
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struct vring_used_elem *vue;
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uint16_t mask;
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/*
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* Notes:
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* - mask is N-1 where N is a power of 2 so computes x % N
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* - vuh points to the "used" data shared with guest
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* - vue points to the "used" ring entry we want to update
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*/
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mask = vq->vq_qsize - 1;
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vuh = vq->vq_used;
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vue = &vuh->ring[vq->vq_next_used++ & mask];
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vue->id = idx;
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vue->len = iolen;
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}
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void
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vq_relchain_publish(struct vqueue_info *vq)
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{
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/*
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* Ensure the used descriptor is visible before updating the index.
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* This is necessary on ISAs with memory ordering less strict than x86
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* (and even on x86 to act as a compiler barrier).
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*/
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atomic_thread_fence_rel();
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vq->vq_used->idx = vq->vq_next_used;
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}
|
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|
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/*
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* Return specified request chain to the guest, setting its I/O length
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* to the provided value.
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*
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* (This chain is the one you handled when you called vq_getchain()
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* and used its positive return value.)
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*/
|
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void
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vq_relchain(struct vqueue_info *vq, uint16_t idx, uint32_t iolen)
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{
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vq_relchain_prepare(vq, idx, iolen);
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vq_relchain_publish(vq);
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}
|
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|
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/*
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* Driver has finished processing "available" chains and calling
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* vq_relchain on each one. If driver used all the available
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* chains, used_all should be set.
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*
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* If the "used" index moved we may need to inform the guest, i.e.,
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* deliver an interrupt. Even if the used index did NOT move we
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* may need to deliver an interrupt, if the avail ring is empty and
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* we are supposed to interrupt on empty.
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*
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* Note that used_all_avail is provided by the caller because it's
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* a snapshot of the ring state when he decided to finish interrupt
|
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* processing -- it's possible that descriptors became available after
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* that point. (It's also typically a constant 1/True as well.)
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*/
|
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void
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vq_endchains(struct vqueue_info *vq, int used_all_avail)
|
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{
|
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struct virtio_softc *vs;
|
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uint16_t event_idx, new_idx, old_idx;
|
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int intr;
|
|
|
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/*
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* Interrupt generation: if we're using EVENT_IDX,
|
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* interrupt if we've crossed the event threshold.
|
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* Otherwise interrupt is generated if we added "used" entries,
|
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* but suppressed by VRING_AVAIL_F_NO_INTERRUPT.
|
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*
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* In any case, though, if NOTIFY_ON_EMPTY is set and the
|
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* entire avail was processed, we need to interrupt always.
|
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*/
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vs = vq->vq_vs;
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old_idx = vq->vq_save_used;
|
|
vq->vq_save_used = new_idx = vq->vq_used->idx;
|
|
|
|
/*
|
|
* Use full memory barrier between "idx" store from preceding
|
|
* vq_relchain() call and the loads from VQ_USED_EVENT_IDX() or
|
|
* "flags" field below.
|
|
*/
|
|
atomic_thread_fence_seq_cst();
|
|
if (used_all_avail &&
|
|
(vs->vs_negotiated_caps & VIRTIO_F_NOTIFY_ON_EMPTY))
|
|
intr = 1;
|
|
else if (vs->vs_negotiated_caps & VIRTIO_RING_F_EVENT_IDX) {
|
|
event_idx = VQ_USED_EVENT_IDX(vq);
|
|
/*
|
|
* This calculation is per docs and the kernel
|
|
* (see src/sys/dev/virtio/virtio_ring.h).
|
|
*/
|
|
intr = (uint16_t)(new_idx - event_idx - 1) <
|
|
(uint16_t)(new_idx - old_idx);
|
|
} else {
|
|
intr = new_idx != old_idx &&
|
|
!(vq->vq_avail->flags & VRING_AVAIL_F_NO_INTERRUPT);
|
|
}
|
|
if (intr)
|
|
vq_interrupt(vs, vq);
|
|
}
|
|
|
|
/* Note: these are in sorted order to make for a fast search */
|
|
static struct config_reg {
|
|
uint16_t cr_offset; /* register offset */
|
|
uint8_t cr_size; /* size (bytes) */
|
|
uint8_t cr_ro; /* true => reg is read only */
|
|
const char *cr_name; /* name of reg */
|
|
} config_regs[] = {
|
|
{ VIRTIO_PCI_HOST_FEATURES, 4, 1, "HOST_FEATURES" },
|
|
{ VIRTIO_PCI_GUEST_FEATURES, 4, 0, "GUEST_FEATURES" },
|
|
{ VIRTIO_PCI_QUEUE_PFN, 4, 0, "QUEUE_PFN" },
|
|
{ VIRTIO_PCI_QUEUE_NUM, 2, 1, "QUEUE_NUM" },
|
|
{ VIRTIO_PCI_QUEUE_SEL, 2, 0, "QUEUE_SEL" },
|
|
{ VIRTIO_PCI_QUEUE_NOTIFY, 2, 0, "QUEUE_NOTIFY" },
|
|
{ VIRTIO_PCI_STATUS, 1, 0, "STATUS" },
|
|
{ VIRTIO_PCI_ISR, 1, 0, "ISR" },
|
|
{ VIRTIO_MSI_CONFIG_VECTOR, 2, 0, "CONFIG_VECTOR" },
|
|
{ VIRTIO_MSI_QUEUE_VECTOR, 2, 0, "QUEUE_VECTOR" },
|
|
};
|
|
|
|
static inline struct config_reg *
|
|
vi_find_cr(int offset) {
|
|
u_int hi, lo, mid;
|
|
struct config_reg *cr;
|
|
|
|
lo = 0;
|
|
hi = sizeof(config_regs) / sizeof(*config_regs) - 1;
|
|
while (hi >= lo) {
|
|
mid = (hi + lo) >> 1;
|
|
cr = &config_regs[mid];
|
|
if (cr->cr_offset == offset)
|
|
return (cr);
|
|
if (cr->cr_offset < offset)
|
|
lo = mid + 1;
|
|
else
|
|
hi = mid - 1;
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Handle pci config space reads.
|
|
* If it's to the MSI-X info, do that.
|
|
* If it's part of the virtio standard stuff, do that.
|
|
* Otherwise dispatch to the actual driver.
|
|
*/
|
|
uint64_t
|
|
vi_pci_read(struct pci_devinst *pi, int baridx, uint64_t offset, int size)
|
|
{
|
|
struct virtio_softc *vs = pi->pi_arg;
|
|
struct virtio_consts *vc;
|
|
struct config_reg *cr;
|
|
uint64_t virtio_config_size, max;
|
|
const char *name;
|
|
uint32_t newoff;
|
|
uint32_t value;
|
|
int error;
|
|
|
|
if (vs->vs_flags & VIRTIO_USE_MSIX) {
|
|
if (baridx == pci_msix_table_bar(pi) ||
|
|
baridx == pci_msix_pba_bar(pi)) {
|
|
return (pci_emul_msix_tread(pi, offset, size));
|
|
}
|
|
}
|
|
|
|
/* XXX probably should do something better than just assert() */
|
|
assert(baridx == 0);
|
|
|
|
if (vs->vs_mtx)
|
|
pthread_mutex_lock(vs->vs_mtx);
|
|
|
|
vc = vs->vs_vc;
|
|
name = vc->vc_name;
|
|
value = size == 1 ? 0xff : size == 2 ? 0xffff : 0xffffffff;
|
|
|
|
if (size != 1 && size != 2 && size != 4)
|
|
goto bad;
|
|
|
|
virtio_config_size = VIRTIO_PCI_CONFIG_OFF(pci_msix_enabled(pi));
|
|
|
|
if (offset >= virtio_config_size) {
|
|
/*
|
|
* Subtract off the standard size (including MSI-X
|
|
* registers if enabled) and dispatch to underlying driver.
|
|
* If that fails, fall into general code.
|
|
*/
|
|
newoff = offset - virtio_config_size;
|
|
max = vc->vc_cfgsize ? vc->vc_cfgsize : 0x100000000;
|
|
if (newoff + size > max)
|
|
goto bad;
|
|
if (vc->vc_cfgread != NULL)
|
|
error = (*vc->vc_cfgread)(DEV_SOFTC(vs), newoff, size, &value);
|
|
else
|
|
error = 0;
|
|
if (!error)
|
|
goto done;
|
|
}
|
|
|
|
bad:
|
|
cr = vi_find_cr(offset);
|
|
if (cr == NULL || cr->cr_size != size) {
|
|
if (cr != NULL) {
|
|
/* offset must be OK, so size must be bad */
|
|
EPRINTLN(
|
|
"%s: read from %s: bad size %d",
|
|
name, cr->cr_name, size);
|
|
} else {
|
|
EPRINTLN(
|
|
"%s: read from bad offset/size %jd/%d",
|
|
name, (uintmax_t)offset, size);
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
switch (offset) {
|
|
case VIRTIO_PCI_HOST_FEATURES:
|
|
value = vc->vc_hv_caps;
|
|
break;
|
|
case VIRTIO_PCI_GUEST_FEATURES:
|
|
value = vs->vs_negotiated_caps;
|
|
break;
|
|
case VIRTIO_PCI_QUEUE_PFN:
|
|
if (vs->vs_curq < vc->vc_nvq)
|
|
value = vs->vs_queues[vs->vs_curq].vq_pfn;
|
|
break;
|
|
case VIRTIO_PCI_QUEUE_NUM:
|
|
value = vs->vs_curq < vc->vc_nvq ?
|
|
vs->vs_queues[vs->vs_curq].vq_qsize : 0;
|
|
break;
|
|
case VIRTIO_PCI_QUEUE_SEL:
|
|
value = vs->vs_curq;
|
|
break;
|
|
case VIRTIO_PCI_QUEUE_NOTIFY:
|
|
value = 0; /* XXX */
|
|
break;
|
|
case VIRTIO_PCI_STATUS:
|
|
value = vs->vs_status;
|
|
break;
|
|
case VIRTIO_PCI_ISR:
|
|
value = vs->vs_isr;
|
|
vs->vs_isr = 0; /* a read clears this flag */
|
|
if (value)
|
|
pci_lintr_deassert(pi);
|
|
break;
|
|
case VIRTIO_MSI_CONFIG_VECTOR:
|
|
value = vs->vs_msix_cfg_idx;
|
|
break;
|
|
case VIRTIO_MSI_QUEUE_VECTOR:
|
|
value = vs->vs_curq < vc->vc_nvq ?
|
|
vs->vs_queues[vs->vs_curq].vq_msix_idx :
|
|
VIRTIO_MSI_NO_VECTOR;
|
|
break;
|
|
}
|
|
done:
|
|
if (vs->vs_mtx)
|
|
pthread_mutex_unlock(vs->vs_mtx);
|
|
return (value);
|
|
}
|
|
|
|
/*
|
|
* Handle pci config space writes.
|
|
* If it's to the MSI-X info, do that.
|
|
* If it's part of the virtio standard stuff, do that.
|
|
* Otherwise dispatch to the actual driver.
|
|
*/
|
|
void
|
|
vi_pci_write(struct pci_devinst *pi, int baridx, uint64_t offset, int size,
|
|
uint64_t value)
|
|
{
|
|
struct virtio_softc *vs = pi->pi_arg;
|
|
struct vqueue_info *vq;
|
|
struct virtio_consts *vc;
|
|
struct config_reg *cr;
|
|
uint64_t virtio_config_size, max;
|
|
const char *name;
|
|
uint32_t newoff;
|
|
int error;
|
|
|
|
if (vs->vs_flags & VIRTIO_USE_MSIX) {
|
|
if (baridx == pci_msix_table_bar(pi) ||
|
|
baridx == pci_msix_pba_bar(pi)) {
|
|
pci_emul_msix_twrite(pi, offset, size, value);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* XXX probably should do something better than just assert() */
|
|
assert(baridx == 0);
|
|
|
|
if (vs->vs_mtx)
|
|
pthread_mutex_lock(vs->vs_mtx);
|
|
|
|
vc = vs->vs_vc;
|
|
name = vc->vc_name;
|
|
|
|
if (size != 1 && size != 2 && size != 4)
|
|
goto bad;
|
|
|
|
virtio_config_size = VIRTIO_PCI_CONFIG_OFF(pci_msix_enabled(pi));
|
|
|
|
if (offset >= virtio_config_size) {
|
|
/*
|
|
* Subtract off the standard size (including MSI-X
|
|
* registers if enabled) and dispatch to underlying driver.
|
|
*/
|
|
newoff = offset - virtio_config_size;
|
|
max = vc->vc_cfgsize ? vc->vc_cfgsize : 0x100000000;
|
|
if (newoff + size > max)
|
|
goto bad;
|
|
if (vc->vc_cfgwrite != NULL)
|
|
error = (*vc->vc_cfgwrite)(DEV_SOFTC(vs), newoff, size, value);
|
|
else
|
|
error = 0;
|
|
if (!error)
|
|
goto done;
|
|
}
|
|
|
|
bad:
|
|
cr = vi_find_cr(offset);
|
|
if (cr == NULL || cr->cr_size != size || cr->cr_ro) {
|
|
if (cr != NULL) {
|
|
/* offset must be OK, wrong size and/or reg is R/O */
|
|
if (cr->cr_size != size)
|
|
EPRINTLN(
|
|
"%s: write to %s: bad size %d",
|
|
name, cr->cr_name, size);
|
|
if (cr->cr_ro)
|
|
EPRINTLN(
|
|
"%s: write to read-only reg %s",
|
|
name, cr->cr_name);
|
|
} else {
|
|
EPRINTLN(
|
|
"%s: write to bad offset/size %jd/%d",
|
|
name, (uintmax_t)offset, size);
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
switch (offset) {
|
|
case VIRTIO_PCI_GUEST_FEATURES:
|
|
vs->vs_negotiated_caps = value & vc->vc_hv_caps;
|
|
if (vc->vc_apply_features)
|
|
(*vc->vc_apply_features)(DEV_SOFTC(vs),
|
|
vs->vs_negotiated_caps);
|
|
break;
|
|
case VIRTIO_PCI_QUEUE_PFN:
|
|
if (vs->vs_curq >= vc->vc_nvq)
|
|
goto bad_qindex;
|
|
vi_vq_init(vs, value);
|
|
break;
|
|
case VIRTIO_PCI_QUEUE_SEL:
|
|
/*
|
|
* Note that the guest is allowed to select an
|
|
* invalid queue; we just need to return a QNUM
|
|
* of 0 while the bad queue is selected.
|
|
*/
|
|
vs->vs_curq = value;
|
|
break;
|
|
case VIRTIO_PCI_QUEUE_NOTIFY:
|
|
if (value >= (unsigned int)vc->vc_nvq) {
|
|
EPRINTLN("%s: queue %d notify out of range",
|
|
name, (int)value);
|
|
goto done;
|
|
}
|
|
vq = &vs->vs_queues[value];
|
|
if (vq->vq_notify)
|
|
(*vq->vq_notify)(DEV_SOFTC(vs), vq);
|
|
else if (vc->vc_qnotify)
|
|
(*vc->vc_qnotify)(DEV_SOFTC(vs), vq);
|
|
else
|
|
EPRINTLN(
|
|
"%s: qnotify queue %d: missing vq/vc notify",
|
|
name, (int)value);
|
|
break;
|
|
case VIRTIO_PCI_STATUS:
|
|
vs->vs_status = value;
|
|
if (value == 0)
|
|
(*vc->vc_reset)(DEV_SOFTC(vs));
|
|
break;
|
|
case VIRTIO_MSI_CONFIG_VECTOR:
|
|
vs->vs_msix_cfg_idx = value;
|
|
break;
|
|
case VIRTIO_MSI_QUEUE_VECTOR:
|
|
if (vs->vs_curq >= vc->vc_nvq)
|
|
goto bad_qindex;
|
|
vq = &vs->vs_queues[vs->vs_curq];
|
|
vq->vq_msix_idx = value;
|
|
break;
|
|
}
|
|
goto done;
|
|
|
|
bad_qindex:
|
|
EPRINTLN(
|
|
"%s: write config reg %s: curq %d >= max %d",
|
|
name, cr->cr_name, vs->vs_curq, vc->vc_nvq);
|
|
done:
|
|
if (vs->vs_mtx)
|
|
pthread_mutex_unlock(vs->vs_mtx);
|
|
}
|
|
|
|
#ifdef BHYVE_SNAPSHOT
|
|
int
|
|
vi_pci_pause(struct pci_devinst *pi)
|
|
{
|
|
struct virtio_softc *vs;
|
|
struct virtio_consts *vc;
|
|
|
|
vs = pi->pi_arg;
|
|
vc = vs->vs_vc;
|
|
|
|
vc = vs->vs_vc;
|
|
assert(vc->vc_pause != NULL);
|
|
(*vc->vc_pause)(DEV_SOFTC(vs));
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vi_pci_resume(struct pci_devinst *pi)
|
|
{
|
|
struct virtio_softc *vs;
|
|
struct virtio_consts *vc;
|
|
|
|
vs = pi->pi_arg;
|
|
vc = vs->vs_vc;
|
|
|
|
vc = vs->vs_vc;
|
|
assert(vc->vc_resume != NULL);
|
|
(*vc->vc_resume)(DEV_SOFTC(vs));
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
vi_pci_snapshot_softc(struct virtio_softc *vs, struct vm_snapshot_meta *meta)
|
|
{
|
|
int ret;
|
|
|
|
SNAPSHOT_VAR_OR_LEAVE(vs->vs_flags, meta, ret, done);
|
|
SNAPSHOT_VAR_OR_LEAVE(vs->vs_negotiated_caps, meta, ret, done);
|
|
SNAPSHOT_VAR_OR_LEAVE(vs->vs_curq, meta, ret, done);
|
|
SNAPSHOT_VAR_OR_LEAVE(vs->vs_status, meta, ret, done);
|
|
SNAPSHOT_VAR_OR_LEAVE(vs->vs_isr, meta, ret, done);
|
|
SNAPSHOT_VAR_OR_LEAVE(vs->vs_msix_cfg_idx, meta, ret, done);
|
|
|
|
done:
|
|
return (ret);
|
|
}
|
|
|
|
static int
|
|
vi_pci_snapshot_consts(struct virtio_consts *vc, struct vm_snapshot_meta *meta)
|
|
{
|
|
int ret;
|
|
|
|
SNAPSHOT_VAR_CMP_OR_LEAVE(vc->vc_nvq, meta, ret, done);
|
|
SNAPSHOT_VAR_CMP_OR_LEAVE(vc->vc_cfgsize, meta, ret, done);
|
|
SNAPSHOT_VAR_CMP_OR_LEAVE(vc->vc_hv_caps, meta, ret, done);
|
|
|
|
done:
|
|
return (ret);
|
|
}
|
|
|
|
static int
|
|
vi_pci_snapshot_queues(struct virtio_softc *vs, struct vm_snapshot_meta *meta)
|
|
{
|
|
int i;
|
|
int ret;
|
|
struct virtio_consts *vc;
|
|
struct vqueue_info *vq;
|
|
struct vmctx *ctx;
|
|
uint64_t addr_size;
|
|
|
|
ctx = vs->vs_pi->pi_vmctx;
|
|
vc = vs->vs_vc;
|
|
|
|
/* Save virtio queue info */
|
|
for (i = 0; i < vc->vc_nvq; i++) {
|
|
vq = &vs->vs_queues[i];
|
|
|
|
SNAPSHOT_VAR_CMP_OR_LEAVE(vq->vq_qsize, meta, ret, done);
|
|
SNAPSHOT_VAR_CMP_OR_LEAVE(vq->vq_num, meta, ret, done);
|
|
|
|
SNAPSHOT_VAR_OR_LEAVE(vq->vq_flags, meta, ret, done);
|
|
SNAPSHOT_VAR_OR_LEAVE(vq->vq_last_avail, meta, ret, done);
|
|
SNAPSHOT_VAR_OR_LEAVE(vq->vq_next_used, meta, ret, done);
|
|
SNAPSHOT_VAR_OR_LEAVE(vq->vq_save_used, meta, ret, done);
|
|
SNAPSHOT_VAR_OR_LEAVE(vq->vq_msix_idx, meta, ret, done);
|
|
|
|
SNAPSHOT_VAR_OR_LEAVE(vq->vq_pfn, meta, ret, done);
|
|
|
|
if (!vq_ring_ready(vq))
|
|
continue;
|
|
|
|
addr_size = vq->vq_qsize * sizeof(struct vring_desc);
|
|
SNAPSHOT_GUEST2HOST_ADDR_OR_LEAVE(ctx, vq->vq_desc, addr_size,
|
|
false, meta, ret, done);
|
|
|
|
addr_size = (2 + vq->vq_qsize + 1) * sizeof(uint16_t);
|
|
SNAPSHOT_GUEST2HOST_ADDR_OR_LEAVE(ctx, vq->vq_avail, addr_size,
|
|
false, meta, ret, done);
|
|
|
|
addr_size = (2 + 2 * vq->vq_qsize + 1) * sizeof(uint16_t);
|
|
SNAPSHOT_GUEST2HOST_ADDR_OR_LEAVE(ctx, vq->vq_used, addr_size,
|
|
false, meta, ret, done);
|
|
|
|
SNAPSHOT_BUF_OR_LEAVE(vq->vq_desc,
|
|
vring_size_aligned(vq->vq_qsize), meta, ret, done);
|
|
}
|
|
|
|
done:
|
|
return (ret);
|
|
}
|
|
|
|
int
|
|
vi_pci_snapshot(struct vm_snapshot_meta *meta)
|
|
{
|
|
int ret;
|
|
struct pci_devinst *pi;
|
|
struct virtio_softc *vs;
|
|
struct virtio_consts *vc;
|
|
|
|
pi = meta->dev_data;
|
|
vs = pi->pi_arg;
|
|
vc = vs->vs_vc;
|
|
|
|
/* Save virtio softc */
|
|
ret = vi_pci_snapshot_softc(vs, meta);
|
|
if (ret != 0)
|
|
goto done;
|
|
|
|
/* Save virtio consts */
|
|
ret = vi_pci_snapshot_consts(vc, meta);
|
|
if (ret != 0)
|
|
goto done;
|
|
|
|
/* Save virtio queue info */
|
|
ret = vi_pci_snapshot_queues(vs, meta);
|
|
if (ret != 0)
|
|
goto done;
|
|
|
|
/* Save device softc, if needed */
|
|
if (vc->vc_snapshot != NULL) {
|
|
ret = (*vc->vc_snapshot)(DEV_SOFTC(vs), meta);
|
|
if (ret != 0)
|
|
goto done;
|
|
}
|
|
|
|
done:
|
|
return (ret);
|
|
}
|
|
#endif
|