qemu/hw/virtio-pci.c
Christoph Hellwig 428c149b0b block: add topology qdev properties
Add three new qdev properties to export block topology information to
the guest.  This is needed to get optimal I/O alignment for RAID arrays
or SSDs.

The options are:

 - physical_block_size to specify the physical block size of the device,
   this is going to increase from 512 bytes to 4096 kilobytes for many
   modern storage devices
 - min_io_size to specify the minimal I/O size without performance impact,
   this is typically set to the RAID chunk size for arrays.
 - opt_io_size to specify the optimal sustained I/O size, this is
   typically the RAID stripe width for arrays.

I decided to not auto-probe these values from blkid which might easily
be possible as I don't know how to deal with these issues on migration.

Note that we specificly only set the physical_block_size, and not the
logial one which is the unit all I/O is described in.  The reason for
that is that IDE does not support increasing the logical block size and
at last for now I want to stick to one meachnisms in queue and allow
for easy switching of transports for a given backing image which would
not be possible if scsi and virtio use real 4k sectors, while ide only
uses the physical block exponent.

To make this more common for the different block drivers introduce a
new BlockConf structure holding all common block properties and a
DEFINE_BLOCK_PROPERTIES macro to add them all together, mirroring
what is done for network drivers.  Also switch over all block drivers
to use it, except for the floppy driver which has weird driveA/driveB
properties and probably won't require any advanced block options ever.

Example usage for a virtio device with 4k physical block size and
8k optimal I/O size:

  -drive file=scratch.img,media=disk,cache=none,id=scratch \
  -device virtio-blk-pci,drive=scratch,physical_block_size=4096,opt_io_size=8192

aliguori: updated patch to take into account BLOCK events

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-02-10 16:53:25 -06:00

617 lines
19 KiB
C

/*
* Virtio PCI Bindings
*
* Copyright IBM, Corp. 2007
* Copyright (c) 2009 CodeSourcery
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
* Paul Brook <paul@codesourcery.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#include <inttypes.h>
#include "virtio.h"
#include "virtio-blk.h"
#include "virtio-net.h"
#include "pci.h"
#include "sysemu.h"
#include "msix.h"
#include "net.h"
#include "block_int.h"
#include "loader.h"
/* from Linux's linux/virtio_pci.h */
/* A 32-bit r/o bitmask of the features supported by the host */
#define VIRTIO_PCI_HOST_FEATURES 0
/* A 32-bit r/w bitmask of features activated by the guest */
#define VIRTIO_PCI_GUEST_FEATURES 4
/* A 32-bit r/w PFN for the currently selected queue */
#define VIRTIO_PCI_QUEUE_PFN 8
/* A 16-bit r/o queue size for the currently selected queue */
#define VIRTIO_PCI_QUEUE_NUM 12
/* A 16-bit r/w queue selector */
#define VIRTIO_PCI_QUEUE_SEL 14
/* A 16-bit r/w queue notifier */
#define VIRTIO_PCI_QUEUE_NOTIFY 16
/* An 8-bit device status register. */
#define VIRTIO_PCI_STATUS 18
/* An 8-bit r/o interrupt status register. Reading the value will return the
* current contents of the ISR and will also clear it. This is effectively
* a read-and-acknowledge. */
#define VIRTIO_PCI_ISR 19
/* MSI-X registers: only enabled if MSI-X is enabled. */
/* A 16-bit vector for configuration changes. */
#define VIRTIO_MSI_CONFIG_VECTOR 20
/* A 16-bit vector for selected queue notifications. */
#define VIRTIO_MSI_QUEUE_VECTOR 22
/* Config space size */
#define VIRTIO_PCI_CONFIG_NOMSI 20
#define VIRTIO_PCI_CONFIG_MSI 24
#define VIRTIO_PCI_REGION_SIZE(dev) (msix_present(dev) ? \
VIRTIO_PCI_CONFIG_MSI : \
VIRTIO_PCI_CONFIG_NOMSI)
/* The remaining space is defined by each driver as the per-driver
* configuration space */
#define VIRTIO_PCI_CONFIG(dev) (msix_enabled(dev) ? \
VIRTIO_PCI_CONFIG_MSI : \
VIRTIO_PCI_CONFIG_NOMSI)
/* Virtio ABI version, if we increment this, we break the guest driver. */
#define VIRTIO_PCI_ABI_VERSION 0
/* How many bits to shift physical queue address written to QUEUE_PFN.
* 12 is historical, and due to x86 page size. */
#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12
/* QEMU doesn't strictly need write barriers since everything runs in
* lock-step. We'll leave the calls to wmb() in though to make it obvious for
* KVM or if kqemu gets SMP support.
*/
#define wmb() do { } while (0)
/* PCI bindings. */
typedef struct {
PCIDevice pci_dev;
VirtIODevice *vdev;
uint32_t addr;
uint32_t class_code;
uint32_t nvectors;
BlockConf block;
NICConf nic;
uint32_t host_features;
/* Max. number of ports we can have for a the virtio-serial device */
uint32_t max_virtserial_ports;
} VirtIOPCIProxy;
/* virtio device */
static void virtio_pci_notify(void *opaque, uint16_t vector)
{
VirtIOPCIProxy *proxy = opaque;
if (msix_enabled(&proxy->pci_dev))
msix_notify(&proxy->pci_dev, vector);
else
qemu_set_irq(proxy->pci_dev.irq[0], proxy->vdev->isr & 1);
}
static void virtio_pci_save_config(void * opaque, QEMUFile *f)
{
VirtIOPCIProxy *proxy = opaque;
pci_device_save(&proxy->pci_dev, f);
msix_save(&proxy->pci_dev, f);
if (msix_present(&proxy->pci_dev))
qemu_put_be16(f, proxy->vdev->config_vector);
}
static void virtio_pci_save_queue(void * opaque, int n, QEMUFile *f)
{
VirtIOPCIProxy *proxy = opaque;
if (msix_present(&proxy->pci_dev))
qemu_put_be16(f, virtio_queue_vector(proxy->vdev, n));
}
static int virtio_pci_load_config(void * opaque, QEMUFile *f)
{
VirtIOPCIProxy *proxy = opaque;
int ret;
ret = pci_device_load(&proxy->pci_dev, f);
if (ret) {
return ret;
}
msix_load(&proxy->pci_dev, f);
if (msix_present(&proxy->pci_dev)) {
qemu_get_be16s(f, &proxy->vdev->config_vector);
} else {
proxy->vdev->config_vector = VIRTIO_NO_VECTOR;
}
if (proxy->vdev->config_vector != VIRTIO_NO_VECTOR) {
return msix_vector_use(&proxy->pci_dev, proxy->vdev->config_vector);
}
return 0;
}
static int virtio_pci_load_queue(void * opaque, int n, QEMUFile *f)
{
VirtIOPCIProxy *proxy = opaque;
uint16_t vector;
if (msix_present(&proxy->pci_dev)) {
qemu_get_be16s(f, &vector);
} else {
vector = VIRTIO_NO_VECTOR;
}
virtio_queue_set_vector(proxy->vdev, n, vector);
if (vector != VIRTIO_NO_VECTOR) {
return msix_vector_use(&proxy->pci_dev, vector);
}
return 0;
}
static void virtio_pci_reset(DeviceState *d)
{
VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev);
virtio_reset(proxy->vdev);
msix_reset(&proxy->pci_dev);
}
static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
{
VirtIOPCIProxy *proxy = opaque;
VirtIODevice *vdev = proxy->vdev;
target_phys_addr_t pa;
switch (addr) {
case VIRTIO_PCI_GUEST_FEATURES:
/* Guest does not negotiate properly? We have to assume nothing. */
if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
if (vdev->bad_features)
val = proxy->host_features & vdev->bad_features(vdev);
else
val = 0;
}
if (vdev->set_features)
vdev->set_features(vdev, val);
vdev->guest_features = val;
break;
case VIRTIO_PCI_QUEUE_PFN:
pa = (target_phys_addr_t)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
if (pa == 0) {
virtio_reset(proxy->vdev);
msix_unuse_all_vectors(&proxy->pci_dev);
}
else
virtio_queue_set_addr(vdev, vdev->queue_sel, pa);
break;
case VIRTIO_PCI_QUEUE_SEL:
if (val < VIRTIO_PCI_QUEUE_MAX)
vdev->queue_sel = val;
break;
case VIRTIO_PCI_QUEUE_NOTIFY:
virtio_queue_notify(vdev, val);
break;
case VIRTIO_PCI_STATUS:
vdev->status = val & 0xFF;
if (vdev->status == 0) {
virtio_reset(proxy->vdev);
msix_unuse_all_vectors(&proxy->pci_dev);
}
break;
case VIRTIO_MSI_CONFIG_VECTOR:
msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
/* Make it possible for guest to discover an error took place. */
if (msix_vector_use(&proxy->pci_dev, val) < 0)
val = VIRTIO_NO_VECTOR;
vdev->config_vector = val;
break;
case VIRTIO_MSI_QUEUE_VECTOR:
msix_vector_unuse(&proxy->pci_dev,
virtio_queue_vector(vdev, vdev->queue_sel));
/* Make it possible for guest to discover an error took place. */
if (msix_vector_use(&proxy->pci_dev, val) < 0)
val = VIRTIO_NO_VECTOR;
virtio_queue_set_vector(vdev, vdev->queue_sel, val);
break;
default:
fprintf(stderr, "%s: unexpected address 0x%x value 0x%x\n",
__func__, addr, val);
break;
}
}
static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
{
VirtIODevice *vdev = proxy->vdev;
uint32_t ret = 0xFFFFFFFF;
switch (addr) {
case VIRTIO_PCI_HOST_FEATURES:
ret = proxy->host_features;
break;
case VIRTIO_PCI_GUEST_FEATURES:
ret = vdev->guest_features;
break;
case VIRTIO_PCI_QUEUE_PFN:
ret = virtio_queue_get_addr(vdev, vdev->queue_sel)
>> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
break;
case VIRTIO_PCI_QUEUE_NUM:
ret = virtio_queue_get_num(vdev, vdev->queue_sel);
break;
case VIRTIO_PCI_QUEUE_SEL:
ret = vdev->queue_sel;
break;
case VIRTIO_PCI_STATUS:
ret = vdev->status;
break;
case VIRTIO_PCI_ISR:
/* reading from the ISR also clears it. */
ret = vdev->isr;
vdev->isr = 0;
qemu_set_irq(proxy->pci_dev.irq[0], 0);
break;
case VIRTIO_MSI_CONFIG_VECTOR:
ret = vdev->config_vector;
break;
case VIRTIO_MSI_QUEUE_VECTOR:
ret = virtio_queue_vector(vdev, vdev->queue_sel);
break;
default:
break;
}
return ret;
}
static uint32_t virtio_pci_config_readb(void *opaque, uint32_t addr)
{
VirtIOPCIProxy *proxy = opaque;
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
addr -= proxy->addr;
if (addr < config)
return virtio_ioport_read(proxy, addr);
addr -= config;
return virtio_config_readb(proxy->vdev, addr);
}
static uint32_t virtio_pci_config_readw(void *opaque, uint32_t addr)
{
VirtIOPCIProxy *proxy = opaque;
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
addr -= proxy->addr;
if (addr < config)
return virtio_ioport_read(proxy, addr);
addr -= config;
return virtio_config_readw(proxy->vdev, addr);
}
static uint32_t virtio_pci_config_readl(void *opaque, uint32_t addr)
{
VirtIOPCIProxy *proxy = opaque;
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
addr -= proxy->addr;
if (addr < config)
return virtio_ioport_read(proxy, addr);
addr -= config;
return virtio_config_readl(proxy->vdev, addr);
}
static void virtio_pci_config_writeb(void *opaque, uint32_t addr, uint32_t val)
{
VirtIOPCIProxy *proxy = opaque;
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
addr -= proxy->addr;
if (addr < config) {
virtio_ioport_write(proxy, addr, val);
return;
}
addr -= config;
virtio_config_writeb(proxy->vdev, addr, val);
}
static void virtio_pci_config_writew(void *opaque, uint32_t addr, uint32_t val)
{
VirtIOPCIProxy *proxy = opaque;
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
addr -= proxy->addr;
if (addr < config) {
virtio_ioport_write(proxy, addr, val);
return;
}
addr -= config;
virtio_config_writew(proxy->vdev, addr, val);
}
static void virtio_pci_config_writel(void *opaque, uint32_t addr, uint32_t val)
{
VirtIOPCIProxy *proxy = opaque;
uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
addr -= proxy->addr;
if (addr < config) {
virtio_ioport_write(proxy, addr, val);
return;
}
addr -= config;
virtio_config_writel(proxy->vdev, addr, val);
}
static void virtio_map(PCIDevice *pci_dev, int region_num,
pcibus_t addr, pcibus_t size, int type)
{
VirtIOPCIProxy *proxy = container_of(pci_dev, VirtIOPCIProxy, pci_dev);
VirtIODevice *vdev = proxy->vdev;
unsigned config_len = VIRTIO_PCI_REGION_SIZE(pci_dev) + vdev->config_len;
proxy->addr = addr;
register_ioport_write(addr, config_len, 1, virtio_pci_config_writeb, proxy);
register_ioport_write(addr, config_len, 2, virtio_pci_config_writew, proxy);
register_ioport_write(addr, config_len, 4, virtio_pci_config_writel, proxy);
register_ioport_read(addr, config_len, 1, virtio_pci_config_readb, proxy);
register_ioport_read(addr, config_len, 2, virtio_pci_config_readw, proxy);
register_ioport_read(addr, config_len, 4, virtio_pci_config_readl, proxy);
if (vdev->config_len)
vdev->get_config(vdev, vdev->config);
}
static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
uint32_t val, int len)
{
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
if (PCI_COMMAND == address) {
if (!(val & PCI_COMMAND_MASTER)) {
proxy->vdev->status &= ~VIRTIO_CONFIG_S_DRIVER_OK;
}
}
pci_default_write_config(pci_dev, address, val, len);
msix_write_config(pci_dev, address, val, len);
}
static unsigned virtio_pci_get_features(void *opaque)
{
VirtIOPCIProxy *proxy = opaque;
return proxy->host_features;
}
static const VirtIOBindings virtio_pci_bindings = {
.notify = virtio_pci_notify,
.save_config = virtio_pci_save_config,
.load_config = virtio_pci_load_config,
.save_queue = virtio_pci_save_queue,
.load_queue = virtio_pci_load_queue,
.get_features = virtio_pci_get_features,
};
static void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev,
uint16_t vendor, uint16_t device,
uint16_t class_code, uint8_t pif)
{
uint8_t *config;
uint32_t size;
proxy->vdev = vdev;
config = proxy->pci_dev.config;
pci_config_set_vendor_id(config, vendor);
pci_config_set_device_id(config, device);
config[0x08] = VIRTIO_PCI_ABI_VERSION;
config[0x09] = pif;
pci_config_set_class(config, class_code);
config[PCI_HEADER_TYPE] = PCI_HEADER_TYPE_NORMAL;
config[0x2c] = vendor & 0xFF;
config[0x2d] = (vendor >> 8) & 0xFF;
config[0x2e] = vdev->device_id & 0xFF;
config[0x2f] = (vdev->device_id >> 8) & 0xFF;
config[0x3d] = 1;
if (vdev->nvectors && !msix_init(&proxy->pci_dev, vdev->nvectors, 1, 0)) {
pci_register_bar(&proxy->pci_dev, 1,
msix_bar_size(&proxy->pci_dev),
PCI_BASE_ADDRESS_SPACE_MEMORY,
msix_mmio_map);
} else
vdev->nvectors = 0;
proxy->pci_dev.config_write = virtio_write_config;
size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev) + vdev->config_len;
if (size & (size-1))
size = 1 << qemu_fls(size);
pci_register_bar(&proxy->pci_dev, 0, size, PCI_BASE_ADDRESS_SPACE_IO,
virtio_map);
virtio_bind_device(vdev, &virtio_pci_bindings, proxy);
proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
proxy->host_features = vdev->get_features(vdev, proxy->host_features);
}
static int virtio_blk_init_pci(PCIDevice *pci_dev)
{
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
VirtIODevice *vdev;
if (proxy->class_code != PCI_CLASS_STORAGE_SCSI &&
proxy->class_code != PCI_CLASS_STORAGE_OTHER)
proxy->class_code = PCI_CLASS_STORAGE_SCSI;
if (!proxy->block.dinfo) {
qemu_error("virtio-blk-pci: drive property not set\n");
return -1;
}
vdev = virtio_blk_init(&pci_dev->qdev, &proxy->block);
vdev->nvectors = proxy->nvectors;
virtio_init_pci(proxy, vdev,
PCI_VENDOR_ID_REDHAT_QUMRANET,
PCI_DEVICE_ID_VIRTIO_BLOCK,
proxy->class_code, 0x00);
/* make the actual value visible */
proxy->nvectors = vdev->nvectors;
return 0;
}
static int virtio_exit_pci(PCIDevice *pci_dev)
{
return msix_uninit(pci_dev);
}
static int virtio_blk_exit_pci(PCIDevice *pci_dev)
{
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
drive_uninit(proxy->block.dinfo);
return virtio_exit_pci(pci_dev);
}
static int virtio_serial_init_pci(PCIDevice *pci_dev)
{
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
VirtIODevice *vdev;
if (proxy->class_code != PCI_CLASS_COMMUNICATION_OTHER &&
proxy->class_code != PCI_CLASS_DISPLAY_OTHER && /* qemu 0.10 */
proxy->class_code != PCI_CLASS_OTHERS) /* qemu-kvm */
proxy->class_code = PCI_CLASS_COMMUNICATION_OTHER;
vdev = virtio_serial_init(&pci_dev->qdev, proxy->max_virtserial_ports);
if (!vdev) {
return -1;
}
vdev->nvectors = proxy->nvectors ? proxy->nvectors
: proxy->max_virtserial_ports + 1;
virtio_init_pci(proxy, vdev,
PCI_VENDOR_ID_REDHAT_QUMRANET,
PCI_DEVICE_ID_VIRTIO_CONSOLE,
proxy->class_code, 0x00);
proxy->nvectors = vdev->nvectors;
return 0;
}
static int virtio_net_init_pci(PCIDevice *pci_dev)
{
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
VirtIODevice *vdev;
vdev = virtio_net_init(&pci_dev->qdev, &proxy->nic);
vdev->nvectors = proxy->nvectors;
virtio_init_pci(proxy, vdev,
PCI_VENDOR_ID_REDHAT_QUMRANET,
PCI_DEVICE_ID_VIRTIO_NET,
PCI_CLASS_NETWORK_ETHERNET,
0x00);
/* make the actual value visible */
proxy->nvectors = vdev->nvectors;
return 0;
}
static int virtio_net_exit_pci(PCIDevice *pci_dev)
{
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
virtio_net_exit(proxy->vdev);
return virtio_exit_pci(pci_dev);
}
static int virtio_balloon_init_pci(PCIDevice *pci_dev)
{
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
VirtIODevice *vdev;
vdev = virtio_balloon_init(&pci_dev->qdev);
virtio_init_pci(proxy, vdev,
PCI_VENDOR_ID_REDHAT_QUMRANET,
PCI_DEVICE_ID_VIRTIO_BALLOON,
PCI_CLASS_MEMORY_RAM,
0x00);
return 0;
}
static PCIDeviceInfo virtio_info[] = {
{
.qdev.name = "virtio-blk-pci",
.qdev.size = sizeof(VirtIOPCIProxy),
.init = virtio_blk_init_pci,
.exit = virtio_blk_exit_pci,
.qdev.props = (Property[]) {
DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
DEFINE_BLOCK_PROPERTIES(VirtIOPCIProxy, block),
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
DEFINE_VIRTIO_BLK_FEATURES(VirtIOPCIProxy, host_features),
DEFINE_PROP_END_OF_LIST(),
},
.qdev.reset = virtio_pci_reset,
},{
.qdev.name = "virtio-net-pci",
.qdev.size = sizeof(VirtIOPCIProxy),
.init = virtio_net_init_pci,
.exit = virtio_net_exit_pci,
.romfile = "pxe-virtio.bin",
.qdev.props = (Property[]) {
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 3),
DEFINE_VIRTIO_NET_FEATURES(VirtIOPCIProxy, host_features),
DEFINE_NIC_PROPERTIES(VirtIOPCIProxy, nic),
DEFINE_PROP_END_OF_LIST(),
},
.qdev.reset = virtio_pci_reset,
},{
.qdev.name = "virtio-serial-pci",
.qdev.alias = "virtio-serial",
.qdev.size = sizeof(VirtIOPCIProxy),
.init = virtio_serial_init_pci,
.exit = virtio_exit_pci,
.qdev.props = (Property[]) {
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 0),
DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
DEFINE_PROP_UINT32("max_ports", VirtIOPCIProxy, max_virtserial_ports,
31),
DEFINE_PROP_END_OF_LIST(),
},
.qdev.reset = virtio_pci_reset,
},{
.qdev.name = "virtio-balloon-pci",
.qdev.size = sizeof(VirtIOPCIProxy),
.init = virtio_balloon_init_pci,
.exit = virtio_exit_pci,
.qdev.props = (Property[]) {
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
DEFINE_PROP_END_OF_LIST(),
},
.qdev.reset = virtio_pci_reset,
},{
/* end of list */
}
};
static void virtio_pci_register_devices(void)
{
pci_qdev_register_many(virtio_info);
}
device_init(virtio_pci_register_devices)