mirror of https://github.com/proxmox/mirror_qemu
535 lines
16 KiB
C
535 lines
16 KiB
C
/*
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* Virtio MMIO bindings
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*
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* Copyright (c) 2011 Linaro Limited
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*
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* Author:
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* Peter Maydell <peter.maydell@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "hw/sysbus.h"
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#include "hw/virtio/virtio.h"
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#include "qemu/host-utils.h"
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#include "sysemu/kvm.h"
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#include "hw/virtio/virtio-bus.h"
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#include "qemu/error-report.h"
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/* #define DEBUG_VIRTIO_MMIO */
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#ifdef DEBUG_VIRTIO_MMIO
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#define DPRINTF(fmt, ...) \
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do { printf("virtio_mmio: " fmt , ## __VA_ARGS__); } while (0)
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#else
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#define DPRINTF(fmt, ...) do {} while (0)
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#endif
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/* QOM macros */
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/* virtio-mmio-bus */
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#define TYPE_VIRTIO_MMIO_BUS "virtio-mmio-bus"
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#define VIRTIO_MMIO_BUS(obj) \
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OBJECT_CHECK(VirtioBusState, (obj), TYPE_VIRTIO_MMIO_BUS)
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#define VIRTIO_MMIO_BUS_GET_CLASS(obj) \
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OBJECT_GET_CLASS(VirtioBusClass, (obj), TYPE_VIRTIO_MMIO_BUS)
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#define VIRTIO_MMIO_BUS_CLASS(klass) \
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OBJECT_CLASS_CHECK(VirtioBusClass, (klass), TYPE_VIRTIO_MMIO_BUS)
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/* virtio-mmio */
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#define TYPE_VIRTIO_MMIO "virtio-mmio"
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#define VIRTIO_MMIO(obj) \
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OBJECT_CHECK(VirtIOMMIOProxy, (obj), TYPE_VIRTIO_MMIO)
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/* Memory mapped register offsets */
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#define VIRTIO_MMIO_MAGIC 0x0
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#define VIRTIO_MMIO_VERSION 0x4
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#define VIRTIO_MMIO_DEVICEID 0x8
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#define VIRTIO_MMIO_VENDORID 0xc
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#define VIRTIO_MMIO_HOSTFEATURES 0x10
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#define VIRTIO_MMIO_HOSTFEATURESSEL 0x14
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#define VIRTIO_MMIO_GUESTFEATURES 0x20
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#define VIRTIO_MMIO_GUESTFEATURESSEL 0x24
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#define VIRTIO_MMIO_GUESTPAGESIZE 0x28
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#define VIRTIO_MMIO_QUEUESEL 0x30
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#define VIRTIO_MMIO_QUEUENUMMAX 0x34
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#define VIRTIO_MMIO_QUEUENUM 0x38
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#define VIRTIO_MMIO_QUEUEALIGN 0x3c
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#define VIRTIO_MMIO_QUEUEPFN 0x40
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#define VIRTIO_MMIO_QUEUENOTIFY 0x50
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#define VIRTIO_MMIO_INTERRUPTSTATUS 0x60
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#define VIRTIO_MMIO_INTERRUPTACK 0x64
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#define VIRTIO_MMIO_STATUS 0x70
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/* Device specific config space starts here */
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#define VIRTIO_MMIO_CONFIG 0x100
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#define VIRT_MAGIC 0x74726976 /* 'virt' */
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#define VIRT_VERSION 1
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#define VIRT_VENDOR 0x554D4551 /* 'QEMU' */
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typedef struct {
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/* Generic */
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SysBusDevice parent_obj;
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MemoryRegion iomem;
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qemu_irq irq;
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/* Guest accessible state needing migration and reset */
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uint32_t host_features_sel;
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uint32_t guest_features_sel;
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uint32_t guest_page_shift;
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/* virtio-bus */
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VirtioBusState bus;
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bool ioeventfd_disabled;
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bool ioeventfd_started;
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} VirtIOMMIOProxy;
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static bool virtio_mmio_ioeventfd_started(DeviceState *d)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
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return proxy->ioeventfd_started;
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}
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static void virtio_mmio_ioeventfd_set_started(DeviceState *d, bool started,
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bool err)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
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proxy->ioeventfd_started = started;
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}
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static bool virtio_mmio_ioeventfd_disabled(DeviceState *d)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
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return !kvm_eventfds_enabled() || proxy->ioeventfd_disabled;
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}
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static void virtio_mmio_ioeventfd_set_disabled(DeviceState *d, bool disabled)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
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proxy->ioeventfd_disabled = disabled;
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}
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static int virtio_mmio_ioeventfd_assign(DeviceState *d,
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EventNotifier *notifier,
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int n, bool assign)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
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if (assign) {
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memory_region_add_eventfd(&proxy->iomem, VIRTIO_MMIO_QUEUENOTIFY, 4,
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true, n, notifier);
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} else {
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memory_region_del_eventfd(&proxy->iomem, VIRTIO_MMIO_QUEUENOTIFY, 4,
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true, n, notifier);
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}
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return 0;
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}
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static void virtio_mmio_start_ioeventfd(VirtIOMMIOProxy *proxy)
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{
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virtio_bus_start_ioeventfd(&proxy->bus);
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}
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static void virtio_mmio_stop_ioeventfd(VirtIOMMIOProxy *proxy)
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{
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virtio_bus_stop_ioeventfd(&proxy->bus);
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}
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static uint64_t virtio_mmio_read(void *opaque, hwaddr offset, unsigned size)
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{
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VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque;
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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DPRINTF("virtio_mmio_read offset 0x%x\n", (int)offset);
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if (!vdev) {
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/* If no backend is present, we treat most registers as
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* read-as-zero, except for the magic number, version and
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* vendor ID. This is not strictly sanctioned by the virtio
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* spec, but it allows us to provide transports with no backend
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* plugged in which don't confuse Linux's virtio code: the
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* probe won't complain about the bad magic number, but the
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* device ID of zero means no backend will claim it.
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*/
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switch (offset) {
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case VIRTIO_MMIO_MAGIC:
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return VIRT_MAGIC;
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case VIRTIO_MMIO_VERSION:
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return VIRT_VERSION;
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case VIRTIO_MMIO_VENDORID:
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return VIRT_VENDOR;
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default:
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return 0;
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}
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}
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if (offset >= VIRTIO_MMIO_CONFIG) {
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offset -= VIRTIO_MMIO_CONFIG;
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switch (size) {
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case 1:
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return virtio_config_readb(vdev, offset);
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case 2:
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return virtio_config_readw(vdev, offset);
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case 4:
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return virtio_config_readl(vdev, offset);
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default:
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abort();
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}
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}
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if (size != 4) {
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DPRINTF("wrong size access to register!\n");
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return 0;
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}
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switch (offset) {
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case VIRTIO_MMIO_MAGIC:
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return VIRT_MAGIC;
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case VIRTIO_MMIO_VERSION:
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return VIRT_VERSION;
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case VIRTIO_MMIO_DEVICEID:
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return vdev->device_id;
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case VIRTIO_MMIO_VENDORID:
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return VIRT_VENDOR;
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case VIRTIO_MMIO_HOSTFEATURES:
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if (proxy->host_features_sel) {
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return 0;
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}
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return vdev->host_features;
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case VIRTIO_MMIO_QUEUENUMMAX:
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if (!virtio_queue_get_num(vdev, vdev->queue_sel)) {
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return 0;
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}
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return VIRTQUEUE_MAX_SIZE;
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case VIRTIO_MMIO_QUEUEPFN:
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return virtio_queue_get_addr(vdev, vdev->queue_sel)
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>> proxy->guest_page_shift;
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case VIRTIO_MMIO_INTERRUPTSTATUS:
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return vdev->isr;
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case VIRTIO_MMIO_STATUS:
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return vdev->status;
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case VIRTIO_MMIO_HOSTFEATURESSEL:
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case VIRTIO_MMIO_GUESTFEATURES:
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case VIRTIO_MMIO_GUESTFEATURESSEL:
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case VIRTIO_MMIO_GUESTPAGESIZE:
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case VIRTIO_MMIO_QUEUESEL:
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case VIRTIO_MMIO_QUEUENUM:
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case VIRTIO_MMIO_QUEUEALIGN:
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case VIRTIO_MMIO_QUEUENOTIFY:
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case VIRTIO_MMIO_INTERRUPTACK:
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DPRINTF("read of write-only register\n");
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return 0;
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default:
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DPRINTF("bad register offset\n");
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return 0;
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}
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return 0;
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}
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static void virtio_mmio_write(void *opaque, hwaddr offset, uint64_t value,
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unsigned size)
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{
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VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque;
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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DPRINTF("virtio_mmio_write offset 0x%x value 0x%" PRIx64 "\n",
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(int)offset, value);
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if (!vdev) {
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/* If no backend is present, we just make all registers
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* write-ignored. This allows us to provide transports with
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* no backend plugged in.
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*/
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return;
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}
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if (offset >= VIRTIO_MMIO_CONFIG) {
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offset -= VIRTIO_MMIO_CONFIG;
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switch (size) {
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case 1:
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virtio_config_writeb(vdev, offset, value);
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break;
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case 2:
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virtio_config_writew(vdev, offset, value);
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break;
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case 4:
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virtio_config_writel(vdev, offset, value);
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break;
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default:
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abort();
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}
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return;
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}
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if (size != 4) {
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DPRINTF("wrong size access to register!\n");
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return;
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}
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switch (offset) {
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case VIRTIO_MMIO_HOSTFEATURESSEL:
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proxy->host_features_sel = value;
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break;
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case VIRTIO_MMIO_GUESTFEATURES:
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if (!proxy->guest_features_sel) {
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virtio_set_features(vdev, value);
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}
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break;
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case VIRTIO_MMIO_GUESTFEATURESSEL:
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proxy->guest_features_sel = value;
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break;
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case VIRTIO_MMIO_GUESTPAGESIZE:
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proxy->guest_page_shift = ctz32(value);
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if (proxy->guest_page_shift > 31) {
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proxy->guest_page_shift = 0;
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}
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DPRINTF("guest page size %" PRIx64 " shift %d\n", value,
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proxy->guest_page_shift);
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break;
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case VIRTIO_MMIO_QUEUESEL:
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if (value < VIRTIO_QUEUE_MAX) {
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vdev->queue_sel = value;
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}
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break;
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case VIRTIO_MMIO_QUEUENUM:
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DPRINTF("mmio_queue write %d max %d\n", (int)value, VIRTQUEUE_MAX_SIZE);
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virtio_queue_set_num(vdev, vdev->queue_sel, value);
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/* Note: only call this function for legacy devices */
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virtio_queue_update_rings(vdev, vdev->queue_sel);
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break;
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case VIRTIO_MMIO_QUEUEALIGN:
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/* Note: this is only valid for legacy devices */
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virtio_queue_set_align(vdev, vdev->queue_sel, value);
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break;
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case VIRTIO_MMIO_QUEUEPFN:
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if (value == 0) {
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virtio_reset(vdev);
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} else {
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virtio_queue_set_addr(vdev, vdev->queue_sel,
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value << proxy->guest_page_shift);
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}
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break;
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case VIRTIO_MMIO_QUEUENOTIFY:
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if (value < VIRTIO_QUEUE_MAX) {
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virtio_queue_notify(vdev, value);
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}
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break;
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case VIRTIO_MMIO_INTERRUPTACK:
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vdev->isr &= ~value;
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virtio_update_irq(vdev);
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break;
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case VIRTIO_MMIO_STATUS:
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if (!(value & VIRTIO_CONFIG_S_DRIVER_OK)) {
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virtio_mmio_stop_ioeventfd(proxy);
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}
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virtio_set_status(vdev, value & 0xff);
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if (value & VIRTIO_CONFIG_S_DRIVER_OK) {
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virtio_mmio_start_ioeventfd(proxy);
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}
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if (vdev->status == 0) {
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virtio_reset(vdev);
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}
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break;
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case VIRTIO_MMIO_MAGIC:
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case VIRTIO_MMIO_VERSION:
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case VIRTIO_MMIO_DEVICEID:
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case VIRTIO_MMIO_VENDORID:
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case VIRTIO_MMIO_HOSTFEATURES:
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case VIRTIO_MMIO_QUEUENUMMAX:
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case VIRTIO_MMIO_INTERRUPTSTATUS:
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DPRINTF("write to readonly register\n");
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break;
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default:
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DPRINTF("bad register offset\n");
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}
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}
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static const MemoryRegionOps virtio_mem_ops = {
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.read = virtio_mmio_read,
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.write = virtio_mmio_write,
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.endianness = DEVICE_NATIVE_ENDIAN,
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};
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static void virtio_mmio_update_irq(DeviceState *opaque, uint16_t vector)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque);
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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int level;
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if (!vdev) {
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return;
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}
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level = (vdev->isr != 0);
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DPRINTF("virtio_mmio setting IRQ %d\n", level);
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qemu_set_irq(proxy->irq, level);
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}
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static int virtio_mmio_load_config(DeviceState *opaque, QEMUFile *f)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque);
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proxy->host_features_sel = qemu_get_be32(f);
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proxy->guest_features_sel = qemu_get_be32(f);
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proxy->guest_page_shift = qemu_get_be32(f);
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return 0;
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}
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static void virtio_mmio_save_config(DeviceState *opaque, QEMUFile *f)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque);
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qemu_put_be32(f, proxy->host_features_sel);
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qemu_put_be32(f, proxy->guest_features_sel);
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qemu_put_be32(f, proxy->guest_page_shift);
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}
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static void virtio_mmio_reset(DeviceState *d)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
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virtio_mmio_stop_ioeventfd(proxy);
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virtio_bus_reset(&proxy->bus);
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proxy->host_features_sel = 0;
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proxy->guest_features_sel = 0;
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proxy->guest_page_shift = 0;
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}
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static int virtio_mmio_set_guest_notifier(DeviceState *d, int n, bool assign,
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bool with_irqfd)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
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VirtQueue *vq = virtio_get_queue(vdev, n);
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EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
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if (assign) {
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int r = event_notifier_init(notifier, 0);
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if (r < 0) {
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return r;
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}
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virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
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} else {
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virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
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event_notifier_cleanup(notifier);
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}
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if (vdc->guest_notifier_mask) {
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vdc->guest_notifier_mask(vdev, n, !assign);
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}
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return 0;
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}
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static int virtio_mmio_set_guest_notifiers(DeviceState *d, int nvqs,
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bool assign)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
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VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
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/* TODO: need to check if kvm-arm supports irqfd */
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bool with_irqfd = false;
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int r, n;
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nvqs = MIN(nvqs, VIRTIO_QUEUE_MAX);
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for (n = 0; n < nvqs; n++) {
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if (!virtio_queue_get_num(vdev, n)) {
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break;
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}
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r = virtio_mmio_set_guest_notifier(d, n, assign, with_irqfd);
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if (r < 0) {
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goto assign_error;
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}
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}
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return 0;
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assign_error:
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/* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
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assert(assign);
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while (--n >= 0) {
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virtio_mmio_set_guest_notifier(d, n, !assign, false);
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}
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return r;
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}
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/* virtio-mmio device */
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static void virtio_mmio_realizefn(DeviceState *d, Error **errp)
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{
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VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
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SysBusDevice *sbd = SYS_BUS_DEVICE(d);
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qbus_create_inplace(&proxy->bus, sizeof(proxy->bus), TYPE_VIRTIO_MMIO_BUS,
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d, NULL);
|
|
sysbus_init_irq(sbd, &proxy->irq);
|
|
memory_region_init_io(&proxy->iomem, OBJECT(d), &virtio_mem_ops, proxy,
|
|
TYPE_VIRTIO_MMIO, 0x200);
|
|
sysbus_init_mmio(sbd, &proxy->iomem);
|
|
}
|
|
|
|
static void virtio_mmio_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
|
|
dc->realize = virtio_mmio_realizefn;
|
|
dc->reset = virtio_mmio_reset;
|
|
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
|
|
}
|
|
|
|
static const TypeInfo virtio_mmio_info = {
|
|
.name = TYPE_VIRTIO_MMIO,
|
|
.parent = TYPE_SYS_BUS_DEVICE,
|
|
.instance_size = sizeof(VirtIOMMIOProxy),
|
|
.class_init = virtio_mmio_class_init,
|
|
};
|
|
|
|
/* virtio-mmio-bus. */
|
|
|
|
static void virtio_mmio_bus_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
BusClass *bus_class = BUS_CLASS(klass);
|
|
VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
|
|
|
|
k->notify = virtio_mmio_update_irq;
|
|
k->save_config = virtio_mmio_save_config;
|
|
k->load_config = virtio_mmio_load_config;
|
|
k->set_guest_notifiers = virtio_mmio_set_guest_notifiers;
|
|
k->ioeventfd_started = virtio_mmio_ioeventfd_started;
|
|
k->ioeventfd_set_started = virtio_mmio_ioeventfd_set_started;
|
|
k->ioeventfd_disabled = virtio_mmio_ioeventfd_disabled;
|
|
k->ioeventfd_set_disabled = virtio_mmio_ioeventfd_set_disabled;
|
|
k->ioeventfd_assign = virtio_mmio_ioeventfd_assign;
|
|
k->has_variable_vring_alignment = true;
|
|
bus_class->max_dev = 1;
|
|
}
|
|
|
|
static const TypeInfo virtio_mmio_bus_info = {
|
|
.name = TYPE_VIRTIO_MMIO_BUS,
|
|
.parent = TYPE_VIRTIO_BUS,
|
|
.instance_size = sizeof(VirtioBusState),
|
|
.class_init = virtio_mmio_bus_class_init,
|
|
};
|
|
|
|
static void virtio_mmio_register_types(void)
|
|
{
|
|
type_register_static(&virtio_mmio_bus_info);
|
|
type_register_static(&virtio_mmio_info);
|
|
}
|
|
|
|
type_init(virtio_mmio_register_types)
|