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-rw-r--r--hw/virtio-pci.c349
1 files changed, 349 insertions, 0 deletions
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
new file mode 100644
index 0000000000..ebc84cc2fe
--- /dev/null
+++ b/hw/virtio-pci.c
@@ -0,0 +1,349 @@
+/*
+ * 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 "pci.h"
+#include "sysemu.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
+
+#define VIRTIO_PCI_CONFIG 20
+
+/* 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;
+
+ uint16_t vendor;
+ uint16_t device;
+ uint16_t subvendor;
+ uint16_t class_code;
+ uint8_t pif;
+} VirtIOPCIProxy;
+
+/* virtio device */
+
+static void virtio_pci_update_irq(void *opaque)
+{
+ VirtIOPCIProxy *proxy = opaque;
+
+ qemu_set_irq(proxy->pci_dev.irq[0], proxy->vdev->isr & 1);
+}
+
+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;
+
+ addr -= proxy->addr;
+
+ 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 = vdev->bad_features(vdev);
+ else
+ val = 0;
+ }
+ if (vdev->set_features)
+ vdev->set_features(vdev, val);
+ vdev->features = val;
+ break;
+ case VIRTIO_PCI_QUEUE_PFN:
+ pa = (target_phys_addr_t)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
+ 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(vdev);
+ break;
+ }
+}
+
+static uint32_t virtio_ioport_read(void *opaque, uint32_t addr)
+{
+ VirtIOPCIProxy *proxy = opaque;
+ VirtIODevice *vdev = proxy->vdev;
+ uint32_t ret = 0xFFFFFFFF;
+
+ addr -= proxy->addr;
+
+ switch (addr) {
+ case VIRTIO_PCI_HOST_FEATURES:
+ ret = vdev->get_features(vdev);
+ ret |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY) | (1 << VIRTIO_F_BAD_FEATURE);
+ break;
+ case VIRTIO_PCI_GUEST_FEATURES:
+ ret = vdev->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;
+ virtio_update_irq(vdev);
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static uint32_t virtio_pci_config_readb(void *opaque, uint32_t addr)
+{
+ VirtIOPCIProxy *proxy = opaque;
+ addr -= proxy->addr + VIRTIO_PCI_CONFIG;
+ return virtio_config_readb(proxy->vdev, addr);
+}
+
+static uint32_t virtio_pci_config_readw(void *opaque, uint32_t addr)
+{
+ VirtIOPCIProxy *proxy = opaque;
+ addr -= proxy->addr + VIRTIO_PCI_CONFIG;
+ return virtio_config_readw(proxy->vdev, addr);
+}
+
+static uint32_t virtio_pci_config_readl(void *opaque, uint32_t addr)
+{
+ VirtIOPCIProxy *proxy = opaque;
+ addr -= proxy->addr + VIRTIO_PCI_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;
+ addr -= proxy->addr + VIRTIO_PCI_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;
+ addr -= proxy->addr + VIRTIO_PCI_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;
+ addr -= proxy->addr + VIRTIO_PCI_CONFIG;
+ virtio_config_writel(proxy->vdev, addr, val);
+}
+
+static void virtio_map(PCIDevice *pci_dev, int region_num,
+ uint32_t addr, uint32_t size, int type)
+{
+ VirtIOPCIProxy *proxy = container_of(pci_dev, VirtIOPCIProxy, pci_dev);
+ VirtIODevice *vdev = proxy->vdev;
+ int i;
+
+ proxy->addr = addr;
+ for (i = 0; i < 3; i++) {
+ register_ioport_write(addr, VIRTIO_PCI_CONFIG, 1 << i,
+ virtio_ioport_write, proxy);
+ register_ioport_read(addr, VIRTIO_PCI_CONFIG, 1 << i,
+ virtio_ioport_read, proxy);
+ }
+
+ if (vdev->config_len) {
+ register_ioport_write(addr + VIRTIO_PCI_CONFIG, vdev->config_len, 1,
+ virtio_pci_config_writeb, proxy);
+ register_ioport_write(addr + VIRTIO_PCI_CONFIG, vdev->config_len, 2,
+ virtio_pci_config_writew, proxy);
+ register_ioport_write(addr + VIRTIO_PCI_CONFIG, vdev->config_len, 4,
+ virtio_pci_config_writel, proxy);
+ register_ioport_read(addr + VIRTIO_PCI_CONFIG, vdev->config_len, 1,
+ virtio_pci_config_readb, proxy);
+ register_ioport_read(addr + VIRTIO_PCI_CONFIG, vdev->config_len, 2,
+ virtio_pci_config_readw, proxy);
+ register_ioport_read(addr + VIRTIO_PCI_CONFIG, vdev->config_len, 4,
+ virtio_pci_config_readl, proxy);
+
+ vdev->get_config(vdev, vdev->config);
+ }
+}
+
+static const VirtIOBindings virtio_pci_bindings = {
+ .update_irq = virtio_pci_update_irq
+};
+
+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;
+
+ size = 20 + vdev->config_len;
+ if (size & (size-1))
+ size = 1 << qemu_fls(size);
+
+ pci_register_io_region(&proxy->pci_dev, 0, size, PCI_ADDRESS_SPACE_IO,
+ virtio_map);
+
+ virtio_bind_device(vdev, &virtio_pci_bindings, proxy);
+}
+
+static void virtio_blk_init_pci(PCIDevice *pci_dev)
+{
+ VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
+ VirtIODevice *vdev;
+
+ vdev = virtio_blk_init(&pci_dev->qdev);
+ virtio_init_pci(proxy, vdev,
+ PCI_VENDOR_ID_REDHAT_QUMRANET,
+ PCI_DEVICE_ID_VIRTIO_BLOCK,
+ PCI_CLASS_STORAGE_OTHER,
+ 0x00);
+}
+
+static void virtio_console_init_pci(PCIDevice *pci_dev)
+{
+ VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
+ VirtIODevice *vdev;
+
+ vdev = virtio_console_init(&pci_dev->qdev);
+ virtio_init_pci(proxy, vdev,
+ PCI_VENDOR_ID_REDHAT_QUMRANET,
+ PCI_DEVICE_ID_VIRTIO_CONSOLE,
+ PCI_CLASS_DISPLAY_OTHER,
+ 0x00);
+}
+
+static void 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);
+ virtio_init_pci(proxy, vdev,
+ PCI_VENDOR_ID_REDHAT_QUMRANET,
+ PCI_DEVICE_ID_VIRTIO_NET,
+ PCI_CLASS_NETWORK_ETHERNET,
+ 0x00);
+}
+
+static void 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);
+}
+
+static void virtio_pci_register_devices(void)
+{
+ pci_qdev_register("virtio-blk-pci", sizeof(VirtIOPCIProxy),
+ virtio_blk_init_pci);
+ pci_qdev_register("virtio-net-pci", sizeof(VirtIOPCIProxy),
+ virtio_net_init_pci);
+ pci_qdev_register("virtio-console-pci", sizeof(VirtIOPCIProxy),
+ virtio_console_init_pci);
+ pci_qdev_register("virtio-balloon-pci", sizeof(VirtIOPCIProxy),
+ virtio_balloon_init_pci);
+}
+
+device_init(virtio_pci_register_devices)
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-13 07:27:09 +0000