This patch builds a virtio-pci layer which can be used by virtio
devices as a layer to interact with virtio-pci. The purpose of the
patch is to seperate the common virtio-pci layer from being replicated
in all virtio devices.
The new layer provides a callback interface to receive information about
virtio events.
This allows us to share the entire functionality of virtio-pci throughout all
virtio devices, for example - we don't need to implement MSI-X for each device
and can just do it once for virtio-pci.
Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>
---
tools/kvm/Makefile | 1 +
tools/kvm/include/kvm/ioport.h | 1 +
tools/kvm/include/kvm/virtio-pci.h | 51 ++++++++
tools/kvm/virtio/pci.c | 231 ++++++++++++++++++++++++++++++++++++
4 files changed, 284 insertions(+), 0 deletions(-)
create mode 100644 tools/kvm/include/kvm/virtio-pci.h
create mode 100644 tools/kvm/virtio/pci.c
diff --git a/tools/kvm/Makefile b/tools/kvm/Makefile
index 316c2c9..669386f 100644
--- a/tools/kvm/Makefile
+++ b/tools/kvm/Makefile
@@ -52,6 +52,7 @@ OBJS += virtio/core.o
OBJS += virtio/net.o
OBJS += virtio/rng.o
OBJS += virtio/balloon.o
+OBJS += virtio/pci.o
OBJS += disk/blk.o
OBJS += disk/qcow.o
OBJS += disk/raw.o
diff --git a/tools/kvm/include/kvm/ioport.h b/tools/kvm/include/kvm/ioport.h
index 45c3856..5b857dd 100644
--- a/tools/kvm/include/kvm/ioport.h
+++ b/tools/kvm/include/kvm/ioport.h
@@ -4,6 +4,7 @@
#include "kvm/rbtree-interval.h"
#include <stdbool.h>
+#include <limits.h>
#include <asm/types.h>
#include <linux/types.h>
diff --git a/tools/kvm/include/kvm/virtio-pci.h b/tools/kvm/include/kvm/virtio-pci.h
new file mode 100644
index 0000000..4524a7f
--- /dev/null
+++ b/tools/kvm/include/kvm/virtio-pci.h
@@ -0,0 +1,51 @@
+#ifndef KVM__VIRTIO_PCI_H
+#define KVM__VIRTIO_PCI_H
+
+#include "kvm/pci.h"
+
+#include <linux/types.h>
+
+#define VIRTIO_PCI_MAX_VQ 3
+
+struct kvm;
+
+struct virtio_pci_ops {
+ void (*set_config)(struct kvm *kvm, void *dev, u8 data, u32 offset);
+ u8 (*get_config)(struct kvm *kvm, void *dev, u32 offset);
+
+ u32 (*get_host_features)(struct kvm *kvm, void *dev);
+ void (*set_guest_features)(struct kvm *kvm, void *dev, u32 features);
+
+ int (*init_vq)(struct kvm *kvm, void *dev, u32 vq, u32 pfn);
+ int (*notify_vq)(struct kvm *kvm, void *dev, u32 vq);
+ int (*get_pfn_vq)(struct kvm *kvm, void *dev, u32 vq);
+ int (*get_size_vq)(struct kvm *kvm, void *dev, u32 vq);
+};
+
+struct virtio_pci {
+ struct pci_device_header pci_hdr;
+ struct virtio_pci_ops ops;
+ void *dev;
+
+ u16 base_addr;
+ u8 status;
+ u8 isr;
+
+ /* MSI-X */
+ u16 config_vector;
+ u32 config_gsi;
+ u32 vq_vector[VIRTIO_PCI_MAX_VQ];
+ u32 gsis[VIRTIO_PCI_MAX_VQ];
+ u32 msix_io_block;
+ int msix_enabled;
+
+ /* virtio queue */
+ u16 queue_selector;
+};
+
+int virtio_pci__init(struct kvm *kvm, struct virtio_pci *vpci, void *dev,
+ int device_id, int subsys_id);
+int virtio_pci__signal_vq(struct kvm *kvm, struct virtio_pci *vpci, u32 vq);
+int virtio_pci__signal_config(struct kvm *kvm, struct virtio_pci *vpci);
+
+#endif
diff --git a/tools/kvm/virtio/pci.c b/tools/kvm/virtio/pci.c
new file mode 100644
index 0000000..6d086fa
--- /dev/null
+++ b/tools/kvm/virtio/pci.c
@@ -0,0 +1,231 @@
+#include "kvm/virtio-pci.h"
+
+#include "kvm/ioport.h"
+#include "kvm/kvm.h"
+#include "kvm/virtio-pci-dev.h"
+#include "kvm/irq.h"
+#include "kvm/virtio.h"
+
+#include <linux/virtio_pci.h>
+#include <string.h>
+
+static bool virtio_pci__specific_io_in(struct kvm *kvm, struct virtio_pci *vpci, u16 port,
+ void *data, int size, int offset)
+{
+ u32 config_offset;
+ int type = virtio__get_dev_specific_field(offset - 20, vpci->msix_enabled,
+ 0, &config_offset);
+ if (type == VIRTIO_PCI_O_MSIX) {
+ switch (offset) {
+ case VIRTIO_MSI_CONFIG_VECTOR:
+ ioport__write16(data, vpci->config_vector);
+ break;
+ case VIRTIO_MSI_QUEUE_VECTOR:
+ ioport__write16(data, vpci->vq_vector[vpci->queue_selector]);
+ break;
+ };
+
+ return true;
+ } else if (type == VIRTIO_PCI_O_CONFIG) {
+ u8 cfg;
+
+ cfg = vpci->ops.get_config(kvm, vpci->dev, config_offset);
+ ioport__write8(data, cfg);
+ return true;
+ }
+
+ return false;
+}
+
+static bool virtio_pci__io_in(struct ioport *ioport, struct kvm *kvm, u16 port, void *data, int size)
+{
+ unsigned long offset;
+ bool ret = true;
+ struct virtio_pci *vpci;
+ u32 val;
+
+ vpci = ioport->priv;
+ offset = port - vpci->base_addr;
+
+ switch (offset) {
+ case VIRTIO_PCI_HOST_FEATURES:
+ val = vpci->ops.get_host_features(kvm, vpci->dev);
+ ioport__write32(data, val);
+ break;
+ case VIRTIO_PCI_QUEUE_PFN:
+ val = vpci->ops.get_pfn_vq(kvm, vpci->dev, vpci->queue_selector);
+ ioport__write32(data, val);
+ break;
+ case VIRTIO_PCI_QUEUE_NUM:
+ val = vpci->ops.get_size_vq(kvm, vpci->dev, vpci->queue_selector);
+ ioport__write32(data, val);
+ break;
+ break;
+ case VIRTIO_PCI_STATUS:
+ ioport__write8(data, vpci->status);
+ break;
+ case VIRTIO_PCI_ISR:
+ ioport__write8(data, vpci->isr);
+ kvm__irq_line(kvm, vpci->pci_hdr.irq_line, VIRTIO_IRQ_LOW);
+ vpci->isr = VIRTIO_IRQ_LOW;
+ break;
+ default:
+ ret = virtio_pci__specific_io_in(kvm, vpci, port, data, size, offset);
+ break;
+ };
+
+ return ret;
+}
+
+static bool virtio_pci__specific_io_out(struct kvm *kvm, struct virtio_pci *vpci, u16 port,
+ void *data, int size, int offset)
+{
+ u32 config_offset, gsi, vec;
+ int type = virtio__get_dev_specific_field(offset - 20, vpci->msix_enabled,
+ 0, &config_offset);
+ if (type == VIRTIO_PCI_O_MSIX) {
+ switch (offset) {
+ case VIRTIO_MSI_CONFIG_VECTOR:
+ vec = vpci->config_vector = ioport__read16(data);
+
+ gsi = irq__add_msix_route(kvm,
+ vpci->pci_hdr.msix.table[vec].low,
+ vpci->pci_hdr.msix.table[vec].high,
+ vpci->pci_hdr.msix.table[vec].data);
+
+ vpci->config_gsi = gsi;
+ break;
+ case VIRTIO_MSI_QUEUE_VECTOR: {
+ vec = vpci->vq_vector[vpci->queue_selector] = ioport__read16(data);
+
+ gsi = irq__add_msix_route(kvm,
+ vpci->pci_hdr.msix.table[vec].low,
+ vpci->pci_hdr.msix.table[vec].high,
+ vpci->pci_hdr.msix.table[vec].data);
+ vpci->gsis[vpci->queue_selector] = gsi;
+ break;
+ }
+ };
+
+ return true;
+ } else if (type == VIRTIO_PCI_O_CONFIG) {
+ vpci->ops.set_config(kvm, vpci->dev, *(u8 *)data, config_offset);
+
+ return true;
+ }
+
+ return false;
+}
+
+static bool virtio_pci__io_out(struct ioport *ioport, struct kvm *kvm, u16 port, void *data, int size)
+{
+ unsigned long offset;
+ bool ret = true;
+ struct virtio_pci *vpci;
+ u32 val;
+
+ vpci = ioport->priv;
+ offset = port - vpci->base_addr;
+
+ switch (offset) {
+ case VIRTIO_PCI_GUEST_FEATURES:
+ val = ioport__read32(data);
+ vpci->ops.set_guest_features(kvm, vpci, val);
+ break;
+ case VIRTIO_PCI_QUEUE_PFN:
+ val = ioport__read32(data);
+ vpci->ops.init_vq(kvm, vpci->dev, vpci->queue_selector, val);
+ break;
+ case VIRTIO_PCI_QUEUE_SEL:
+ vpci->queue_selector = ioport__read16(data);
+ break;
+ case VIRTIO_PCI_QUEUE_NOTIFY:
+ val = ioport__read16(data);
+ vpci->ops.notify_vq(kvm, vpci->dev, val);
+ break;
+ case VIRTIO_PCI_STATUS:
+ vpci->status = ioport__read8(data);
+ break;
+ default:
+ ret = virtio_pci__specific_io_out(kvm, vpci, port, data, size, offset);
+ break;
+ };
+
+ return ret;
+}
+
+static struct ioport_operations virtio_pci__io_ops = {
+ .io_in = virtio_pci__io_in,
+ .io_out = virtio_pci__io_out,
+};
+
+static void callback_mmio(u64 addr, u8 *data, u32 len, u8 is_write, void *ptr)
+{
+ struct virtio_pci *vpci = ptr;
+ void *table = &vpci->pci_hdr.msix.table;
+
+ vpci->msix_enabled = 1;
+ if (is_write)
+ memcpy(table + addr - vpci->msix_io_block, data, len);
+ else
+ memcpy(data, table + addr - vpci->msix_io_block, len);
+}
+
+int virtio_pci__signal_vq(struct kvm *kvm, struct virtio_pci *vpci, u32 vq)
+{
+ kvm__irq_line(kvm, vpci->gsis[vq], VIRTIO_IRQ_HIGH);
+
+ return 0;
+}
+
+int virtio_pci__signal_config(struct kvm *kvm, struct virtio_pci *vpci)
+{
+ kvm__irq_line(kvm, vpci->config_gsi, VIRTIO_IRQ_HIGH);
+
+ return 0;
+}
+
+int virtio_pci__init(struct kvm *kvm, struct virtio_pci *vpci, void *dev,
+ int device_id, int subsys_id)
+{
+ u8 pin, line, ndev;
+
+ vpci->dev = dev;
+ vpci->msix_io_block = pci_get_io_space_block();
+
+ vpci->base_addr = ioport__register(IOPORT_EMPTY, &virtio_pci__io_ops, IOPORT_SIZE, vpci);
+ kvm__register_mmio(kvm, vpci->msix_io_block, 0x100, callback_mmio, vpci);
+
+ vpci->pci_hdr = (struct pci_device_header) {
+ .vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET,
+ .device_id = device_id,
+ .header_type = PCI_HEADER_TYPE_NORMAL,
+ .revision_id = 0,
+ .class = 0x010000,
+ .subsys_vendor_id = PCI_SUBSYSTEM_VENDOR_ID_REDHAT_QUMRANET,
+ .subsys_id = subsys_id,
+ .bar[0] = vpci->base_addr | PCI_BASE_ADDRESS_SPACE_IO,
+ .bar[1] = vpci->msix_io_block |
+ PCI_BASE_ADDRESS_SPACE_MEMORY |
+ PCI_BASE_ADDRESS_MEM_TYPE_64,
+ /* bar[2] is the continuation of bar[1] for 64bit addressing */
+ .bar[2] = 0,
+ .status = PCI_STATUS_CAP_LIST,
+ .capabilities = (void *)&vpci->pci_hdr.msix - (void *)&vpci->pci_hdr,
+ };
+
+ vpci->pci_hdr.msix.cap = PCI_CAP_ID_MSIX;
+ vpci->pci_hdr.msix.next = 0;
+ vpci->pci_hdr.msix.table_size = (VIRTIO_PCI_MAX_VQ + 1) | PCI_MSIX_FLAGS_ENABLE;
+ vpci->pci_hdr.msix.table_offset = 1; /* Use BAR 1 */
+ vpci->config_vector = 0;
+
+ if (irq__register_device(VIRTIO_ID_RNG, &ndev, &pin, &line) < 0)
+ return -1;
+
+ vpci->pci_hdr.irq_pin = pin;
+ vpci->pci_hdr.irq_line = line;
+ pci__register(&vpci->pci_hdr, ndev);
+
+ return 0;
+}
--
1.7.6
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