This adds the core of the QEMU VFIO-based PCI device assignment driver.
To make use of this driver, enable CONFIG_VFIO, CONFIG_VFIO_IOMMU_TYPE1,
and CONFIG_VFIO_PCI in your host Linux kernel config. Load the vfio-pci
module. To assign device 0000:05:00.0 to a guest, do the following:
for dev in $(ls /sys/bus/pci/devices/0000:05:00.0/iommu_group/devices); do
vendor=$(cat /sys/bus/pci/devices/$dev/vendor)
device=$(cat /sys/bus/pci/devices/$dev/device)
if [ -e /sys/bus/pci/devices/$dev/driver ]; then
echo $dev > /sys/bus/pci/devices/$dev/driver/unbind
fi
echo $vendor $device > /sys/bus/pci/drivers/vfio-pci/new_id
done
See Documentation/vfio.txt in the Linux kernel tree for further
description of IOMMU groups and VFIO.
Then launch qemu including the option:
-device vfio-pci,host=0000:05:00.0
Support for legacy PCI interrupts (INTx) is not yet included and will
be added in a future update. Both MSI and MSI-X are supported here.
Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
---
hw/vfio_pci.c | 1853 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
hw/vfio_pci.h | 101 +++
2 files changed, 1954 insertions(+)
create mode 100644 hw/vfio_pci.c
create mode 100644 hw/vfio_pci.h
diff --git a/hw/vfio_pci.c b/hw/vfio_pci.c
new file mode 100644
index 0000000..71bb1bd
--- /dev/null
+++ b/hw/vfio_pci.c
@@ -0,0 +1,1853 @@
+/*
+ * vfio based device assignment support
+ *
+ * Copyright Red Hat, Inc. 2012
+ *
+ * Authors:
+ * Alex Williamson <alex.williamson@xxxxxxxxxx>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ * Based on qemu-kvm device-assignment:
+ * Adapted for KVM by Qumranet.
+ * Copyright (c) 2007, Neocleus, Alex Novik (alex@xxxxxxxxxxxx)
+ * Copyright (c) 2007, Neocleus, Guy Zana (guy@xxxxxxxxxxxx)
+ * Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@xxxxxxxxxxxx)
+ * Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@xxxxxxxxxx)
+ * Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@xxxxxxxxxx)
+ */
+
+#include <dirent.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <linux/vfio.h>
+
+#include "config.h"
+#include "event_notifier.h"
+#include "exec-memory.h"
+#include "kvm.h"
+#include "memory.h"
+#include "msi.h"
+#include "msix.h"
+#include "qemu-error.h"
+#include "range.h"
+#include "vfio_pci.h"
+
+/* #define DEBUG_VFIO */
+#ifdef DEBUG_VFIO
+#define DPRINTF(fmt, ...) \
+ do { fprintf(stderr, "vfio: " fmt, ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) \
+ do { } while (0)
+#endif
+
+#define MSIX_CAP_LENGTH 12
+
+static QLIST_HEAD(, VFIOContainer)
+ container_list = QLIST_HEAD_INITIALIZER(container_list);
+
+static QLIST_HEAD(, VFIOGroup)
+ group_list = QLIST_HEAD_INITIALIZER(group_list);
+
+static void vfio_disable_interrupts(VFIODevice *vdev);
+static uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len);
+
+/*
+ * Common VFIO interrupt disable
+ */
+static void vfio_disable_irqindex(VFIODevice *vdev, int index)
+{
+ struct vfio_irq_set irq_set = {
+ .argsz = sizeof(irq_set),
+ .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER,
+ .index = index,
+ .start = 0,
+ .count = 0,
+ };
+
+ ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
+
+ vdev->interrupt = INT_NONE;
+}
+
+/*
+ * INTx
+ */
+static void vfio_unmask_intx(VFIODevice *vdev)
+{
+ struct vfio_irq_set irq_set = {
+ .argsz = sizeof(irq_set),
+ .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK,
+ .index = VFIO_PCI_INTX_IRQ_INDEX,
+ .start = 0,
+ .count = 1,
+ };
+
+ ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
+}
+
+static void vfio_intx_interrupt(void *opaque)
+{
+ VFIODevice *vdev = opaque;
+
+ if (!event_notifier_test_and_clear(&vdev->intx.interrupt)) {
+ return;
+ }
+
+ DPRINTF("%s(%04x:%02x:%02x.%x) Pin %c\n", __func__, vdev->host.domain,
+ vdev->host.bus, vdev->host.slot, vdev->host.function,
+ 'A' + vdev->intx.pin);
+
+ vdev->intx.pending = true;
+ qemu_set_irq(vdev->pdev.irq[vdev->intx.pin], 1);
+}
+
+static void vfio_eoi(VFIODevice *vdev)
+{
+ if (!vdev->intx.pending) {
+ return;
+ }
+
+ DPRINTF("%s(%04x:%02x:%02x.%x) EOI\n", __func__, vdev->host.domain,
+ vdev->host.bus, vdev->host.slot, vdev->host.function);
+
+ vdev->intx.pending = false;
+ qemu_set_irq(vdev->pdev.irq[vdev->intx.pin], 0);
+ vfio_unmask_intx(vdev);
+}
+
+struct vfio_irq_set_fd {
+ struct vfio_irq_set irq_set;
+ int32_t fd;
+} QEMU_PACKED;
+
+static void vfio_enable_intx_kvm(VFIODevice *vdev)
+{
+#ifdef CONFIG_KVM
+ /*
+ * VFIO supports an eventfd for INTx notification and an irqfd-like
+ * mechanism for unmasking INTx. If we could get a level irqfd in
+ * KVM and an eventfd triggered on EOI from guest, we could interlock
+ * these and avoid userspace for INTx. Work in progress.
+ */
+#endif
+}
+
+static void vfio_disable_intx_kvm(VFIODevice *vdev)
+{
+#ifdef CONFIG_KVM
+ /* Same. */
+#endif
+}
+
+static void vfio_update_irq(PCIDevice *pdev)
+{
+ VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
+ PCIINTxRoute route;
+
+ if (vdev->interrupt != INT_INTx) {
+ return;
+ }
+
+ route = pci_device_route_intx_to_irq(&vdev->pdev, vdev->intx.pin);
+ if (!memcmp(&route, &vdev->intx.route, sizeof(route))) {
+ return; /* Nothing changed */
+ }
+
+ DPRINTF("%s(%04x:%02x:%02x.%x) IRQ moved %d -> %d\n", __func__,
+ vdev->host.domain, vdev->host.bus, vdev->host.slot,
+ vdev->host.function, vdev->intx.route.irq, route.irq);
+
+ vfio_disable_intx_kvm(vdev);
+ /* TBD - Disable QEMU eoi notifier */
+
+ vdev->intx.route = route;
+
+ if (route.mode == PCI_INTX_DISABLED) {
+ return;
+ }
+
+ /* TBD - Enable QEMU eoi notifier */
+ vfio_enable_intx_kvm(vdev);
+
+ /* Re-enable the interrupt in cased we missed an EOI */
+ vfio_eoi(vdev);
+}
+
+static int vfio_enable_intx(VFIODevice *vdev)
+{
+ struct vfio_irq_set_fd irq_set_fd = {
+ .irq_set = {
+ .argsz = sizeof(irq_set_fd),
+ .flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER,
+ .index = VFIO_PCI_INTX_IRQ_INDEX,
+ .start = 0,
+ .count = 1,
+ },
+ };
+ uint8_t pin = vfio_pci_read_config(&vdev->pdev, PCI_INTERRUPT_PIN, 1);
+
+ if (!pin) {
+ return 0;
+ }
+
+ vfio_disable_interrupts(vdev);
+
+ vdev->intx.pin = pin - 1; /* Pin A (1) -> irq[0] */
+ vdev->intx.route = pci_device_route_intx_to_irq(&vdev->pdev,
+ vdev->intx.pin);
+ /* TBD - Enable QEMU eoi notifier */
+
+ if (event_notifier_init(&vdev->intx.interrupt, 0)) {
+ error_report("vfio: Error: event_notifier_init failed\n");
+ return -1;
+ }
+
+ irq_set_fd.fd = event_notifier_get_fd(&vdev->intx.interrupt);
+ qemu_set_fd_handler(irq_set_fd.fd, vfio_intx_interrupt, NULL, vdev);
+
+ if (ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set_fd)) {
+ error_report("vfio: Error: Failed to setup INTx fd: %s\n",
+ strerror(errno));
+ return -1;
+ }
+
+ vfio_enable_intx_kvm(vdev);
+
+ vdev->interrupt = INT_INTx;
+
+ DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
+ vdev->host.bus, vdev->host.slot, vdev->host.function);
+
+ return 0;
+}
+
+static void vfio_disable_intx(VFIODevice *vdev)
+{
+ int fd;
+
+ vfio_disable_intx_kvm(vdev);
+ vfio_disable_irqindex(vdev, VFIO_PCI_INTX_IRQ_INDEX);
+
+ /* TBD - Disable QEMU eoi notifier */
+
+ fd = event_notifier_get_fd(&vdev->intx.interrupt);
+ qemu_set_fd_handler(fd, NULL, NULL, vdev);
+ event_notifier_cleanup(&vdev->intx.interrupt);
+
+ vdev->interrupt = INT_NONE;
+
+ DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
+ vdev->host.bus, vdev->host.slot, vdev->host.function);
+}
+
+/*
+ * MSI/X
+ */
+static void vfio_msi_interrupt(void *opaque)
+{
+ MSIVector *vec = opaque;
+ VFIODevice *vdev = vec->vdev;
+
+ if (!event_notifier_test_and_clear(&vec->interrupt)) {
+ return;
+ }
+
+ DPRINTF("%s(%04x:%02x:%02x.%x) vector %d\n", __func__,
+ vdev->host.domain, vdev->host.bus, vdev->host.slot,
+ vdev->host.function, vec->vector);
+
+ if (vdev->interrupt == INT_MSIX) {
+ msix_notify(&vdev->pdev, vec->vector);
+ } else if (vdev->interrupt == INT_MSI) {
+ msi_notify(&vdev->pdev, vec->vector);
+ } else {
+ error_report("vfio: MSI interrupt receieved, but not enabled?\n");
+ }
+}
+
+static int vfio_enable_vectors(VFIODevice *vdev, bool msix)
+{
+ struct vfio_irq_set *irq_set;
+ int ret = 0, i, argsz;
+ int32_t *fds;
+
+ argsz = sizeof(*irq_set) + (vdev->nr_vectors * sizeof(*fds));
+
+ irq_set = g_malloc0(argsz);
+ irq_set->argsz = argsz;
+ irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
+ irq_set->index = msix ? VFIO_PCI_MSIX_IRQ_INDEX : VFIO_PCI_MSI_IRQ_INDEX;
+ irq_set->start = 0;
+ irq_set->count = vdev->nr_vectors;
+ fds = (int32_t *)&irq_set->data;
+
+ for (i = 0; i < vdev->nr_vectors; i++) {
+ if (!vdev->msi_vectors[i].use) {
+ fds[i] = -1;
+ continue;
+ }
+
+ fds[i] = event_notifier_get_fd(&vdev->msi_vectors[i].interrupt);
+ }
+
+ ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
+
+ g_free(irq_set);
+
+ if (!ret) {
+ vdev->interrupt = msix ? INT_MSIX : INT_MSI;
+ }
+
+ return ret;
+}
+
+static int vfio_msix_vector_use(PCIDevice *pdev,
+ unsigned int vector, MSIMessage msg)
+{
+ VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
+ int ret, fd;
+
+ DPRINTF("%s(%04x:%02x:%02x.%x) vector %d used\n", __func__,
+ vdev->host.domain, vdev->host.bus, vdev->host.slot,
+ vdev->host.function, vector);
+
+ if (vdev->interrupt != INT_MSIX) {
+ vfio_disable_interrupts(vdev);
+ }
+
+ if (!vdev->msi_vectors) {
+ vdev->msi_vectors = g_malloc0(vdev->msix->entries * sizeof(MSIVector));
+ }
+
+ vdev->msi_vectors[vector].vdev = vdev;
+ vdev->msi_vectors[vector].vector = vector;
+ vdev->msi_vectors[vector].use = true;
+
+ msix_vector_use(pdev, vector);
+
+ if (event_notifier_init(&vdev->msi_vectors[vector].interrupt, 0)) {
+ error_report("vfio: Error: event_notifier_init failed\n");
+ }
+
+ fd = event_notifier_get_fd(&vdev->msi_vectors[vector].interrupt);
+
+ /*
+ * Attempt to enable route through KVM irqchip,
+ * default to userspace handling if unavailable.
+ */
+ vdev->msi_vectors[vector].virq = kvm_irqchip_add_msi_route(kvm_state, msg);
+ if (vdev->msi_vectors[vector].virq < 0 ||
+ kvm_irqchip_add_irqfd(kvm_state, fd,
+ vdev->msi_vectors[vector].virq) < 0) {
+ qemu_set_fd_handler(fd, vfio_msi_interrupt, NULL,
+ &vdev->msi_vectors[vector]);
+ }
+
+ /*
+ * We don't want to have the host allocate all possible MSI vectors
+ * for a device if they're not in use, so we shutdown and incrementally
+ * increase them as needed.
+ */
+ if (vdev->nr_vectors < vector + 1) {
+ int i;
+
+ vfio_disable_irqindex(vdev, VFIO_PCI_MSIX_IRQ_INDEX);
+ vdev->nr_vectors = vector + 1;
+ ret = vfio_enable_vectors(vdev, true);
+ if (ret) {
+ error_report("vfio: failed to enable vectors, %d\n", ret);
+ }
+
+ /* We don't know if we've missed interrupts in the interim... */
+ for (i = 0; i < vdev->msix->entries; i++) {
+ if (vdev->msi_vectors[i].use) {
+ msix_notify(&vdev->pdev, i);
+ }
+ }
+ } else {
+ struct vfio_irq_set_fd irq_set_fd = {
+ .irq_set = {
+ .argsz = sizeof(irq_set_fd),
+ .flags = VFIO_IRQ_SET_DATA_EVENTFD |
+ VFIO_IRQ_SET_ACTION_TRIGGER,
+ .index = VFIO_PCI_MSIX_IRQ_INDEX,
+ .start = vector,
+ .count = 1,
+ },
+ .fd = fd,
+ };
+ ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set_fd);
+ if (ret) {
+ error_report("vfio: failed to modify vector, %d\n", ret);
+ }
+ msix_notify(&vdev->pdev, vector);
+ }
+
+ return 0;
+}
+
+static void vfio_msix_vector_release(PCIDevice *pdev, unsigned int vector)
+{
+ VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
+ struct vfio_irq_set_fd irq_set_fd = {
+ .irq_set = {
+ .argsz = sizeof(irq_set_fd),
+ .flags = VFIO_IRQ_SET_DATA_EVENTFD |
+ VFIO_IRQ_SET_ACTION_TRIGGER,
+ .index = VFIO_PCI_MSIX_IRQ_INDEX,
+ .start = vector,
+ .count = 1,
+ },
+ .fd = -1,
+ };
+ int fd;
+
+ DPRINTF("%s(%04x:%02x:%02x.%x) vector %d released\n", __func__,
+ vdev->host.domain, vdev->host.bus, vdev->host.slot,
+ vdev->host.function, vector);
+
+ /*
+ * XXX What's the right thing to do here? This turns off the interrupt
+ * completely, but do we really just want to switch the interrupt to
+ * bouncing through userspace and let msix.c drop it? Not sure.
+ */
+ msix_vector_unuse(pdev, vector);
+ ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set_fd);
+
+ fd = event_notifier_get_fd(&vdev->msi_vectors[vector].interrupt);
+
+ if (vdev->msi_vectors[vector].virq < 0) {
+ qemu_set_fd_handler(fd, NULL, NULL, NULL);
+ } else {
+ kvm_irqchip_remove_irqfd(kvm_state, fd, vdev->msi_vectors[vector].virq);
+ kvm_irqchip_release_virq(kvm_state, vdev->msi_vectors[vector].virq);
+ vdev->msi_vectors[vector].virq = -1;
+ }
+
+ event_notifier_cleanup(&vdev->msi_vectors[vector].interrupt);
+ vdev->msi_vectors[vector].use = false;
+}
+
+/* XXX This should move to msi.c */
+static MSIMessage msi_get_msg(PCIDevice *pdev, unsigned int vector)
+{
+ uint16_t flags = pci_get_word(pdev->config + pdev->msi_cap + PCI_MSI_FLAGS);
+ bool msi64bit = flags & PCI_MSI_FLAGS_64BIT;
+ MSIMessage msg;
+
+ if (msi64bit) {
+ msg.address = pci_get_quad(pdev->config +
+ pdev->msi_cap + PCI_MSI_ADDRESS_LO);
+ } else {
+ msg.address = pci_get_long(pdev->config +
+ pdev->msi_cap + PCI_MSI_ADDRESS_LO);
+ }
+
+ msg.data = pci_get_word(pdev->config + pdev->msi_cap +
+ (msi64bit ? PCI_MSI_DATA_64 : PCI_MSI_DATA_32));
+ msg.data += vector;
+
+ return msg;
+}
+
+/* So should this */
+static void msi_set_qsize(PCIDevice *pdev, uint8_t size)
+{
+ uint8_t *config = pdev->config + pdev->msi_cap;
+ uint16_t flags;
+
+ flags = pci_get_word(config + PCI_MSI_FLAGS);
+ flags = le16_to_cpu(flags);
+ flags &= ~PCI_MSI_FLAGS_QSIZE;
+ flags |= (size & 0x7) << 4;
+ flags = cpu_to_le16(flags);
+ pci_set_word(config + PCI_MSI_FLAGS, flags);
+}
+
+static void vfio_enable_msi(VFIODevice *vdev)
+{
+ int ret, i;
+
+ vfio_disable_interrupts(vdev);
+
+ vdev->nr_vectors = msi_nr_vectors_allocated(&vdev->pdev);
+retry:
+ vdev->msi_vectors = g_malloc0(vdev->nr_vectors * sizeof(MSIVector));
+
+ for (i = 0; i < vdev->nr_vectors; i++) {
+ MSIMessage msg;
+ int fd;
+
+ vdev->msi_vectors[i].vdev = vdev;
+ vdev->msi_vectors[i].vector = i;
+ vdev->msi_vectors[i].use = true;
+
+ if (event_notifier_init(&vdev->msi_vectors[i].interrupt, 0)) {
+ error_report("vfio: Error: event_notifier_init failed\n");
+ }
+
+ fd = event_notifier_get_fd(&vdev->msi_vectors[i].interrupt);
+
+ msg = msi_get_msg(&vdev->pdev, i);
+
+ /*
+ * Attempt to enable route through KVM irqchip,
+ * default to userspace handling if unavailable.
+ */
+ vdev->msi_vectors[i].virq = kvm_irqchip_add_msi_route(kvm_state, msg);
+ if (vdev->msi_vectors[i].virq < 0 ||
+ kvm_irqchip_add_irqfd(kvm_state, fd,
+ vdev->msi_vectors[i].virq) < 0) {
+ qemu_set_fd_handler(fd, vfio_msi_interrupt, NULL,
+ &vdev->msi_vectors[i]);
+ }
+ }
+
+ ret = vfio_enable_vectors(vdev, false);
+ if (ret) {
+ if (ret < 0) {
+ error_report("vfio: Error: Failed to setup MSI fds: %s\n",
+ strerror(errno));
+ } else if (ret != vdev->nr_vectors) {
+ error_report("vfio: Error: Failed to enable %d "
+ "MSI vectors, retry with %d\n", vdev->nr_vectors, ret);
+ }
+
+ for (i = 0; i < vdev->nr_vectors; i++) {
+ int fd = event_notifier_get_fd(&vdev->msi_vectors[i].interrupt);
+ if (vdev->msi_vectors[i].virq >= 0) {
+ kvm_irqchip_remove_irqfd(kvm_state, fd,
+ vdev->msi_vectors[i].virq);
+ kvm_irqchip_release_virq(kvm_state, vdev->msi_vectors[i].virq);
+ vdev->msi_vectors[i].virq = -1;
+ } else {
+ qemu_set_fd_handler(fd, NULL, NULL, NULL);
+ }
+ event_notifier_cleanup(&vdev->msi_vectors[i].interrupt);
+ }
+
+ g_free(vdev->msi_vectors);
+
+ if (ret > 0 && ret != vdev->nr_vectors) {
+ vdev->nr_vectors = ret;
+ goto retry;
+ }
+ vdev->nr_vectors = 0;
+
+ return;
+ }
+
+ msi_set_qsize(&vdev->pdev, vdev->nr_vectors);
+
+ DPRINTF("%s(%04x:%02x:%02x.%x) Enabled %d MSI vectors\n", __func__,
+ vdev->host.domain, vdev->host.bus, vdev->host.slot,
+ vdev->host.function, vdev->nr_vectors);
+}
+
+static void vfio_disable_msi_x(VFIODevice *vdev, bool msix)
+{
+ int i;
+
+ vfio_disable_irqindex(vdev, msix ? VFIO_PCI_MSIX_IRQ_INDEX :
+ VFIO_PCI_MSI_IRQ_INDEX);
+
+ for (i = 0; i < vdev->nr_vectors; i++) {
+ int fd;
+
+ if (!vdev->msi_vectors[i].use) {
+ continue;
+ }
+
+ fd = event_notifier_get_fd(&vdev->msi_vectors[i].interrupt);
+
+ if (vdev->msi_vectors[i].virq >= 0) {
+ kvm_irqchip_remove_irqfd(kvm_state, fd, vdev->msi_vectors[i].virq);
+ kvm_irqchip_release_virq(kvm_state, vdev->msi_vectors[i].virq);
+ vdev->msi_vectors[i].virq = -1;
+ } else {
+ qemu_set_fd_handler(fd, NULL, NULL, NULL);
+ }
+
+ if (msix) {
+ msix_vector_unuse(&vdev->pdev, i);
+ }
+
+ event_notifier_cleanup(&vdev->msi_vectors[i].interrupt);
+ }
+
+ g_free(vdev->msi_vectors);
+ vdev->msi_vectors = NULL;
+ vdev->nr_vectors = 0;
+
+ if (!msix) {
+ msi_set_qsize(&vdev->pdev, 0); /* Actually still means 1 vector */
+ }
+
+ DPRINTF("%s(%04x:%02x:%02x.%x, msi%s)\n", __func__,
+ vdev->host.domain, vdev->host.bus, vdev->host.slot,
+ vdev->host.function, msix ? "x" : "");
+
+ vfio_enable_intx(vdev);
+}
+
+/*
+ * IO Port/MMIO - Beware of the endians, VFIO is always little endian
+ */
+static void vfio_bar_write(void *opaque, target_phys_addr_t addr,
+ uint64_t data, unsigned size)
+{
+ VFIOBAR *bar = opaque;
+ uint8_t buf[8];
+
+ switch (size) {
+ case 1:
+ *buf = data & 0xff;
+ break;
+ case 2:
+ *(uint16_t *)buf = cpu_to_le16(data);
+ break;
+ case 4:
+ *(uint32_t *)buf = cpu_to_le32(data);
+ break;
+ default:
+ hw_error("vfio: unsupported write size, %d bytes\n", size);
+ break;
+ }
+
+ if (pwrite(bar->fd, buf, size, bar->fd_offset + addr) != size) {
+ error_report("%s(,0x%"PRIx64", 0x%"PRIx64", %d) failed: %s\n",
+ __func__, addr, data, size, strerror(errno));
+ }
+
+ DPRINTF("%s(BAR%d+0x%"PRIx64", 0x%"PRIx64", %d)\n",
+ __func__, bar->nr, addr, data, size);
+}
+
+static uint64_t vfio_bar_read(void *opaque,
+ target_phys_addr_t addr, unsigned size)
+{
+ VFIOBAR *bar = opaque;
+ uint8_t buf[8];
+ uint64_t data = 0;
+
+ if (pread(bar->fd, buf, size, bar->fd_offset + addr) != size) {
+ error_report("%s(,0x%"PRIx64", %d) failed: %s\n",
+ __func__, addr, size, strerror(errno));
+ return (uint64_t)-1;
+ }
+
+ switch (size) {
+ case 1:
+ data = buf[0];
+ break;
+ case 2:
+ data = le16_to_cpu(*(uint16_t *)buf);
+ break;
+ case 4:
+ data = le32_to_cpu(*(uint32_t *)buf);
+ break;
+ default:
+ hw_error("vfio: unsupported read size, %d bytes\n", size);
+ break;
+ }
+
+ DPRINTF("%s(BAR%d+0x%"PRIx64", %d) = 0x%"PRIx64"\n",
+ __func__, bar->nr, addr, size, data);
+
+ return data;
+}
+
+static const MemoryRegionOps vfio_bar_ops = {
+ .read = vfio_bar_read,
+ .write = vfio_bar_write,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+/*
+ * PCI config space
+ */
+static uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len)
+{
+ VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
+ uint32_t val = 0;
+
+ /*
+ * We only need QEMU PCI config support for the ROM BAR, the MSI and MSIX
+ * capabilities, and the multifunction bit below. We let VFIO handle
+ * virtualizing everything else. Performance is not a concern here.
+ */
+ if (ranges_overlap(addr, len, PCI_ROM_ADDRESS, 4) ||
+ (pdev->cap_present & QEMU_PCI_CAP_MSIX &&
+ ranges_overlap(addr, len, pdev->msix_cap, MSIX_CAP_LENGTH)) ||
+ (pdev->cap_present & QEMU_PCI_CAP_MSI &&
+ ranges_overlap(addr, len, pdev->msi_cap, vdev->msi_cap_size))) {
+
+ val = pci_default_read_config(pdev, addr, len);
+ } else {
+ if (pread(vdev->fd, &val, len, vdev->config_offset + addr) != len) {
+ error_report("%s(%04x:%02x:%02x.%x, 0x%x, 0x%x) failed: %s\n",
+ __func__, vdev->host.domain, vdev->host.bus,
+ vdev->host.slot, vdev->host.function, addr, len,
+ strerror(errno));
+ return -1;
+ }
+ val = le32_to_cpu(val);
+ }
+
+ /* Multifunction bit is virualized in QEMU */
+ if (unlikely(ranges_overlap(addr, len, PCI_HEADER_TYPE, 1))) {
+ uint32_t mask = PCI_HEADER_TYPE_MULTI_FUNCTION;
+
+ if (len == 4) {
+ mask <<= 16;
+ }
+
+ if (pdev->cap_present & QEMU_PCI_CAP_MULTIFUNCTION) {
+ val |= mask;
+ } else {
+ val &= ~mask;
+ }
+ }
+
+ DPRINTF("%s(%04x:%02x:%02x.%x, @0x%x, len=0x%x) %x\n", __func__,
+ vdev->host.domain, vdev->host.bus, vdev->host.slot,
+ vdev->host.function, addr, len, val);
+
+ return val;
+}
+
+static void vfio_pci_write_config(PCIDevice *pdev, uint32_t addr,
+ uint32_t val, int len)
+{
+ VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
+ uint32_t val_le = cpu_to_le32(val);
+
+ DPRINTF("%s(%04x:%02x:%02x.%x, @0x%x, 0x%x, len=0x%x)\n", __func__,
+ vdev->host.domain, vdev->host.bus, vdev->host.slot,
+ vdev->host.function, addr, val, len);
+
+ /* Write everything to VFIO, let it filter out what we can't write */
+ if (pwrite(vdev->fd, &val_le, len, vdev->config_offset + addr) != len) {
+ error_report("%s(%04x:%02x:%02x.%x, 0x%x, 0x%x, 0x%x) failed: %s\n",
+ __func__, vdev->host.domain, vdev->host.bus,
+ vdev->host.slot, vdev->host.function, addr, val, len,
+ strerror(errno));
+ }
+
+ /* Write standard header bits to emulation */
+ if (addr < PCI_CONFIG_HEADER_SIZE) {
+ pci_default_write_config(pdev, addr, val, len);
+ return;
+ }
+
+ /* MSI/MSI-X Enabling/Disabling */
+ if (pdev->cap_present & QEMU_PCI_CAP_MSI &&
+ ranges_overlap(addr, len, pdev->msi_cap, vdev->msi_cap_size)) {
+ int is_enabled, was_enabled = msi_enabled(pdev);
+
+ pci_default_write_config(pdev, addr, val, len);
+
+ is_enabled = msi_enabled(pdev);
+
+ if (!was_enabled && is_enabled) {
+ vfio_enable_msi(vdev);
+ } else if (was_enabled && !is_enabled) {
+ vfio_disable_msi_x(vdev, false);
+ }
+ }
+
+ if (pdev->cap_present & QEMU_PCI_CAP_MSIX &&
+ ranges_overlap(addr, len, pdev->msix_cap, MSIX_CAP_LENGTH)) {
+ int is_enabled, was_enabled = msix_enabled(pdev);
+
+ pci_default_write_config(pdev, addr, val, len);
+
+ is_enabled = msix_enabled(pdev);
+
+ if (!was_enabled && is_enabled) {
+ /* vfio_msix_vector_use handles this automatically */
+ } else if (was_enabled && !is_enabled) {
+ vfio_disable_msi_x(vdev, true);
+ }
+ }
+}
+
+/*
+ * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
+ */
+static int vfio_dma_map(VFIOContainer *container, target_phys_addr_t iova,
+ ram_addr_t size, void *vaddr, bool readonly)
+{
+ struct vfio_iommu_type1_dma_map map = {
+ .argsz = sizeof(map),
+ .flags = VFIO_DMA_MAP_FLAG_READ,
+ .vaddr = (__u64)vaddr,
+ .iova = iova,
+ .size = size,
+ };
+
+ if (!readonly) {
+ map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
+ }
+
+ if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map)) {
+ DPRINTF("VFIO_MAP_DMA: %d\n", -errno);
+ return -errno;
+ }
+
+ return 0;
+}
+
+static int vfio_dma_unmap(VFIOContainer *container,
+ target_phys_addr_t iova, ram_addr_t size)
+{
+ struct vfio_iommu_type1_dma_unmap unmap = {
+ .argsz = sizeof(unmap),
+ .flags = 0,
+ .iova = iova,
+ .size = size,
+ };
+
+ if (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
+ DPRINTF("VFIO_UNMAP_DMA: %d\n", -errno);
+ return -errno;
+ }
+
+ return 0;
+}
+
+static void vfio_listener_dummy1(MemoryListener *listener)
+{
+ /* We don't do batching (begin/commit) or care about logging */
+}
+
+static void vfio_listener_dummy2(MemoryListener *listener,
+ MemoryRegionSection *section)
+{
+ /* We don't do logging or care about nops */
+}
+
+static void vfio_listener_dummy3(MemoryListener *listener,
+ MemoryRegionSection *section,
+ bool match_data, uint64_t data,
+ EventNotifier *e)
+{
+ /* We don't care about eventfds */
+}
+
+static bool vfio_listener_skipped_section(MemoryRegionSection *section)
+{
+ return !memory_region_is_ram(section->mr);
+}
+
+static void vfio_listener_region_add(MemoryListener *listener,
+ MemoryRegionSection *section)
+{
+ VFIOContainer *container = container_of(listener, VFIOContainer,
+ iommu_data.listener);
+ target_phys_addr_t iova, end;
+ void *vaddr;
+ int ret;
+
+ if (vfio_listener_skipped_section(section)) {
+ DPRINTF("vfio: SKIPPING region_add %016lx - %016lx\n",
+ section->offset_within_address_space,
+ section->offset_within_address_space + section->size - 1);
+ return;
+ }
+
+ if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
+ (section->offset_within_region & ~TARGET_PAGE_MASK))) {
+ error_report("%s received unaligned region\n", __func__);
+ return;
+ }
+
+ iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
+ end = (section->offset_within_address_space + section->size) &
+ TARGET_PAGE_MASK;
+
+ if (iova >= end) {
+ return;
+ }
+
+ vaddr = memory_region_get_ram_ptr(section->mr) +
+ section->offset_within_region +
+ (iova - section->offset_within_address_space);
+
+ DPRINTF("vfio: region_add %016lx - %016lx [%p]\n",
+ iova, end - 1, vaddr);
+
+ ret = vfio_dma_map(container, iova, end - iova, vaddr, section->readonly);
+ if (ret) {
+ error_report("vfio_dma_map(%p, 0x%016lx, 0x%lx, %p) = %d (%s)\n",
+ container, iova, end - iova, vaddr, ret, strerror(errno));
+ }
+}
+
+static void vfio_listener_region_del(MemoryListener *listener,
+ MemoryRegionSection *section)
+{
+ VFIOContainer *container = container_of(listener, VFIOContainer,
+ iommu_data.listener);
+ target_phys_addr_t iova, end;
+ int ret;
+
+ if (vfio_listener_skipped_section(section)) {
+ DPRINTF("vfio: SKIPPING region_del %016lx - %016lx\n",
+ section->offset_within_address_space,
+ section->offset_within_address_space + section->size - 1);
+ return;
+ }
+
+ if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
+ (section->offset_within_region & ~TARGET_PAGE_MASK))) {
+ error_report("%s received unaligned region\n", __func__);
+ return;
+ }
+
+ iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
+ end = (section->offset_within_address_space + section->size) &
+ TARGET_PAGE_MASK;
+
+ if (iova >= end) {
+ return;
+ }
+
+ DPRINTF("vfio: region_del %016lx - %016lx\n", iova, end - 1);
+
+ ret = vfio_dma_unmap(container, iova, end - iova);
+ if (ret) {
+ error_report("vfio_dma_unmap(%p, 0x%016lx, 0x%lx) = %d (%s)\n",
+ container, iova, end - iova, ret, strerror(errno));
+ }
+}
+
+static void vfio_listener_release(VFIOContainer *container)
+{
+ memory_listener_unregister(&container->iommu_data.listener);
+}
+
+/*
+ * Interrupt setup
+ */
+static void vfio_disable_interrupts(VFIODevice *vdev)
+{
+ switch (vdev->interrupt) {
+ case INT_INTx:
+ vfio_disable_intx(vdev);
+ break;
+ case INT_MSI:
+ vfio_disable_msi_x(vdev, false);
+ break;
+ case INT_MSIX:
+ vfio_disable_msi_x(vdev, true);
+ break;
+ }
+}
+
+static int vfio_setup_msi(VFIODevice *vdev, int pos)
+{
+ uint16_t ctrl;
+ bool msi_64bit, msi_maskbit;
+ int ret, entries;
+
+ if (!msi_supported) {
+ return 0;
+ }
+
+ if (pread(vdev->fd, &ctrl, sizeof(ctrl),
+ vdev->config_offset + pos + PCI_CAP_FLAGS) != sizeof(ctrl)) {
+ return -1;
+ }
+ ctrl = le16_to_cpu(ctrl);
+
+ msi_64bit = !!(ctrl & PCI_MSI_FLAGS_64BIT);
+ msi_maskbit = !!(ctrl & PCI_MSI_FLAGS_MASKBIT);
+ entries = 1 << ((ctrl & PCI_MSI_FLAGS_QMASK) >> 1);
+
+ DPRINTF("%04x:%02x:%02x.%x PCI MSI CAP @0x%x\n", vdev->host.domain,
+ vdev->host.bus, vdev->host.slot, vdev->host.function, pos);
+
+ ret = msi_init(&vdev->pdev, pos, entries, msi_64bit, msi_maskbit);
+ if (ret < 0) {
+ error_report("vfio: msi_init failed\n");
+ return ret;
+ }
+ vdev->msi_cap_size = 0xa + (msi_maskbit ? 0xa : 0) + (msi_64bit ? 0x4 : 0);
+
+ return 0;
+}
+
+/*
+ * We don't have any control over how pci_add_capability() inserts
+ * capabilities into the chain. In order to setup MSI-X we need a
+ * MemoryRegion for the BAR. In order to setup the BAR and not
+ * attempt to mmap the MSI-X table area, which VFIO won't allow, we
+ * need to first look for where the MSI-X table lives. So we
+ * unfortunately split MSI-X setup across two functions.
+ */
+static int vfio_early_setup_msix(VFIODevice *vdev)
+{
+ uint8_t pos;
+ uint16_t ctrl;
+ uint32_t table, pba;
+
+ pos = pci_find_capability(&vdev->pdev, PCI_CAP_ID_MSIX);
+ if (!pos) {
+ return 0;
+ }
+
+ if (pread(vdev->fd, &ctrl, sizeof(ctrl),
+ vdev->config_offset + pos + PCI_CAP_FLAGS) != sizeof(ctrl)) {
+ return -1;
+ }
+
+ if (pread(vdev->fd, &table, sizeof(table),
+ vdev->config_offset + pos + PCI_MSIX_TABLE) != sizeof(table)) {
+ return -1;
+ }
+
+ if (pread(vdev->fd, &pba, sizeof(pba),
+ vdev->config_offset + pos + PCI_MSIX_PBA) != sizeof(pba)) {
+ return -1;
+ }
+
+ ctrl = le16_to_cpu(ctrl);
+ table = le32_to_cpu(table);
+ pba = le32_to_cpu(pba);
+
+ vdev->msix = g_malloc0(sizeof(*(vdev->msix)));
+ vdev->msix->table_bar = table & PCI_MSIX_FLAGS_BIRMASK;
+ vdev->msix->table_offset = table & ~PCI_MSIX_FLAGS_BIRMASK;
+ vdev->msix->pba_bar = pba & PCI_MSIX_FLAGS_BIRMASK;
+ vdev->msix->pba_offset = pba & ~PCI_MSIX_FLAGS_BIRMASK;
+ vdev->msix->entries = (ctrl & PCI_MSIX_FLAGS_QSIZE) + 1;
+
+ DPRINTF("%04x:%02x:%02x.%x "
+ "PCI MSI-X CAP @0x%x, BAR %d, offset 0x%x, entries %d\n",
+ vdev->host.domain, vdev->host.bus, vdev->host.slot,
+ vdev->host.function, pos, vdev->msix->table_bar,
+ vdev->msix->table_offset, vdev->msix->entries);
+
+ return 0;
+}
+
+static int vfio_setup_msix(VFIODevice *vdev, int pos)
+{
+ int ret;
+
+ if (!msi_supported) {
+ return 0;
+ }
+
+ ret = msix_init(&vdev->pdev, vdev->msix->entries,
+ &vdev->bars[vdev->msix->table_bar].mem,
+ vdev->msix->table_bar, vdev->msix->table_offset,
+ &vdev->bars[vdev->msix->pba_bar].mem,
+ vdev->msix->pba_bar, vdev->msix->pba_offset, pos);
+ if (ret < 0) {
+ error_report("vfio: msix_init failed\n");
+ return ret;
+ }
+
+ ret = msix_set_vector_notifiers(&vdev->pdev, vfio_msix_vector_use,
+ vfio_msix_vector_release);
+ if (ret) {
+ error_report("vfio: msix_set_vector_notifiers failed %d\n", ret);
+ msix_uninit(&vdev->pdev, &vdev->bars[vdev->msix->table_bar].mem,
+ &vdev->bars[vdev->msix->pba_bar].mem);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void vfio_teardown_msi(VFIODevice *vdev)
+{
+ msi_uninit(&vdev->pdev);
+
+ if (vdev->msix) {
+ /* FIXME: Why can't unset just silently do nothing?? */
+ if (vdev->pdev.msix_vector_use_notifier &&
+ vdev->pdev.msix_vector_release_notifier) {
+ msix_unset_vector_notifiers(&vdev->pdev);
+ }
+
+ msix_uninit(&vdev->pdev, &vdev->bars[vdev->msix->table_bar].mem,
+ &vdev->bars[vdev->msix->pba_bar].mem);
+ }
+}
+
+/*
+ * Resource setup
+ */
+static void vfio_unmap_bar(VFIODevice *vdev, int nr)
+{
+ VFIOBAR *bar = &vdev->bars[nr];
+
+ if (!bar->size) {
+ return;
+ }
+
+ memory_region_del_subregion(&bar->mem, &bar->mmap_mem);
+ munmap(bar->mmap, memory_region_size(&bar->mmap_mem));
+
+ if (vdev->msix && vdev->msix->table_bar == nr) {
+ memory_region_del_subregion(&bar->mem, &vdev->msix->mmap_mem);
+ munmap(vdev->msix->mmap, memory_region_size(&vdev->msix->mmap_mem));
+ }
+
+ memory_region_destroy(&bar->mem);
+}
+
+static int vfio_mmap_bar(VFIOBAR *bar, MemoryRegion *mem, MemoryRegion *submem,
+ void **map, size_t size, off_t offset,
+ const char *name)
+{
+ int ret = 0;
+
+ if (size && bar->flags & VFIO_REGION_INFO_FLAG_MMAP) {
+ int prot = 0;
+
+ if (bar->flags & VFIO_REGION_INFO_FLAG_READ) {
+ prot |= PROT_READ;
+ }
+
+ if (bar->flags & VFIO_REGION_INFO_FLAG_WRITE) {
+ prot |= PROT_WRITE;
+ }
+
+ *map = mmap(NULL, size, prot, MAP_SHARED,
+ bar->fd, bar->fd_offset + offset);
+ if (*map == MAP_FAILED) {
+ *map = NULL;
+ ret = -errno;
+ goto empty_region;
+ }
+
+ memory_region_init_ram_ptr(submem, name, size, *map);
+ } else {
+empty_region:
+ /* Create a zero sized sub-region to make cleanup easy. */
+ memory_region_init(submem, name, 0);
+ }
+
+ memory_region_add_subregion(mem, offset, submem);
+
+ return ret;
+}
+
+static void vfio_map_bar(VFIODevice *vdev, int nr)
+{
+ VFIOBAR *bar = &vdev->bars[nr];
+ unsigned size = bar->size;
+ char name[64];
+ uint32_t pci_bar;
+ uint8_t type;
+ int ret;
+
+ /* Skip both unimplemented BARs and the upper half of 64bit BARS. */
+ if (!size) {
+ return;
+ }
+
+ snprintf(name, sizeof(name), "VFIO %04x:%02x:%02x.%x BAR %d",
+ vdev->host.domain, vdev->host.bus, vdev->host.slot,
+ vdev->host.function, nr);
+
+ /* Determine what type of BAR this is for registration */
+ ret = pread(vdev->fd, &pci_bar, sizeof(pci_bar),
+ vdev->config_offset + PCI_BASE_ADDRESS_0 + (4 * nr));
+ if (ret != sizeof(pci_bar)) {
+ error_report("vfio: Failed to read BAR %d (%s)\n", nr, strerror(errno));
+ return;
+ }
+
+ pci_bar = le32_to_cpu(pci_bar);
+ type = pci_bar & (pci_bar & PCI_BASE_ADDRESS_SPACE_IO ?
+ ~PCI_BASE_ADDRESS_IO_MASK : ~PCI_BASE_ADDRESS_MEM_MASK);
+
+ /* A "slow" read/write mapping underlies all BARs */
+ memory_region_init_io(&bar->mem, &vfio_bar_ops, bar, name, size);
+ pci_register_bar(&vdev->pdev, nr, type, &bar->mem);
+
+ /*
+ * We can't mmap areas overlapping the MSIX vector table, so we
+ * potentially insert a direct-mapped subregion before and after it.
+ */
+ if (vdev->msix && vdev->msix->table_bar == nr) {
+ size = vdev->msix->table_offset & TARGET_PAGE_MASK;
+ }
+
+ strncat(name, " mmap", sizeof(name) - strlen(name) - 1);
+ if (vfio_mmap_bar(bar, &bar->mem,
+ &bar->mmap_mem, &bar->mmap, size, 0, name)) {
+ error_report("%s unsupported. Performance may be slow\n", name);
+ }
+
+ if (vdev->msix && vdev->msix->table_bar == nr) {
+ unsigned start;
+
+ start = TARGET_PAGE_ALIGN(vdev->msix->table_offset +
+ (vdev->msix->entries * PCI_MSIX_ENTRY_SIZE));
+
+ size = start < bar->size ? bar->size - start : 0;
+ strncat(name, " msix-hi", sizeof(name) - strlen(name) - 1);
+ /* MSIXInfo contains another MemoryRegion for this mapping */
+ if (vfio_mmap_bar(bar, &bar->mem, &vdev->msix->mmap_mem,
+ &vdev->msix->mmap, size, start, name)) {
+ error_report("%s unsupported. Performance may be slow\n", name);
+ }
+ }
+
+ return;
+}
+
+static void vfio_map_bars(VFIODevice *vdev)
+{
+ int i;
+
+ for (i = 0; i < PCI_ROM_SLOT; i++) {
+ vfio_map_bar(vdev, i);
+ }
+}
+
+static void vfio_unmap_bars(VFIODevice *vdev)
+{
+ int i;
+
+ for (i = 0; i < PCI_ROM_SLOT; i++) {
+ vfio_unmap_bar(vdev, i);
+ }
+}
+
+/*
+ * General setup
+ */
+static uint8_t vfio_std_cap_max_size(PCIDevice *pdev, uint8_t pos)
+{
+ uint8_t tmp, next = 0xff;
+
+ for (tmp = pdev->config[PCI_CAPABILITY_LIST]; tmp;
+ tmp = pdev->config[tmp + 1]) {
+ if (tmp > pos && tmp < next) {
+ next = tmp;
+ }
+ }
+
+ return next - pos;
+}
+
+static int vfio_add_std_cap(VFIODevice *vdev, uint8_t pos)
+{
+ PCIDevice *pdev = &vdev->pdev;
+ uint8_t cap_id, next, size;
+ int ret;
+
+ cap_id = pdev->config[pos];
+ next = pdev->config[pos + 1];
+
+ /*
+ * If it becomes important to configure capabilities to their actual
+ * size, use this as the default when it's something we don't recognize.
+ * Since QEMU doesn't actually handle many of the config accesses,
+ * exact size doesn't seem worthwhile.
+ */
+ size = vfio_std_cap_max_size(pdev, pos);
+
+ /*
+ * pci_add_capability always inserts the new capability at the head
+ * of the chain. Therefore to end up with a chain that matches the
+ * physical device, we insert from the end by making this recursive.
+ * This is also why we pre-caclulate size above as cached config space
+ * will be changed as we unwind the stack.
+ */
+ if (next) {
+ ret = vfio_add_std_cap(vdev, next);
+ if (ret) {
+ return ret;
+ }
+ } else {
+ pdev->config[PCI_CAPABILITY_LIST] = 0; /* Begin the rebuild */
+ }
+
+ switch (cap_id) {
+ case PCI_CAP_ID_MSI:
+ ret = vfio_setup_msi(vdev, pos);
+ break;
+ case PCI_CAP_ID_MSIX:
+ ret = vfio_setup_msix(vdev, pos);
+ break;
+ default:
+ ret = pci_add_capability(pdev, cap_id, pos, size);
+ break;
+ }
+
+ if (ret < 0) {
+ error_report("vfio: %04x:%02x:%02x.%x Error adding PCI capability "
+ "0x%x[0x%x]@0x%x: %d\n", vdev->host.domain,
+ vdev->host.bus, vdev->host.slot, vdev->host.function,
+ cap_id, size, pos, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int vfio_add_capabilities(VFIODevice *vdev)
+{
+ PCIDevice *pdev = &vdev->pdev;
+
+ if (!(pdev->config[PCI_STATUS] & PCI_STATUS_CAP_LIST) ||
+ !pdev->config[PCI_CAPABILITY_LIST]) {
+ return 0; /* Nothing to add */
+ }
+
+ return vfio_add_std_cap(vdev, pdev->config[PCI_CAPABILITY_LIST]);
+}
+
+static int vfio_load_rom(VFIODevice *vdev)
+{
+ uint64_t size = vdev->rom_size;
+ const VMStateDescription *vmsd;
+ char name[32];
+ off_t off = 0, voff = vdev->rom_offset;
+ ssize_t bytes;
+ void *ptr;
+
+ /* If loading ROM from file, pci handles it */
+ if (vdev->pdev.romfile || !vdev->pdev.rom_bar || !size) {
+ return 0;
+ }
+
+ DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
+ vdev->host.bus, vdev->host.slot, vdev->host.function);
+
+ vmsd = qdev_get_vmsd(DEVICE(&vdev->pdev));
+
+ if (vmsd) {
+ snprintf(name, sizeof(name), "%s.rom", vmsd->name);
+ } else {
+ snprintf(name, sizeof(name), "%s.rom",
+ object_get_typename(OBJECT(&vdev->pdev)));
+ }
+ memory_region_init_ram(&vdev->pdev.rom, name, size);
+ ptr = memory_region_get_ram_ptr(&vdev->pdev.rom);
+ memset(ptr, 0xff, size);
+
+ while (size) {
+ bytes = pread(vdev->fd, ptr + off, size, voff + off);
+ if (bytes == 0) {
+ break; /* expect that we could get back less than the ROM BAR */
+ } else if (bytes > 0) {
+ off += bytes;
+ size -= bytes;
+ } else {
+ if (errno == EINTR || errno == EAGAIN) {
+ continue;
+ }
+ error_report("vfio: Error reading device ROM: %s\n",
+ strerror(errno));
+ memory_region_destroy(&vdev->pdev.rom);
+ return -1;
+ }
+ }
+
+ pci_register_bar(&vdev->pdev, PCI_ROM_SLOT, 0, &vdev->pdev.rom);
+ vdev->pdev.has_rom = true;
+ return 0;
+}
+
+static int vfio_connect_container(VFIOGroup *group)
+{
+ VFIOContainer *container;
+ int ret, fd;
+
+ if (group->container) {
+ return 0;
+ }
+
+ QLIST_FOREACH(container, &container_list, next) {
+ if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
+ group->container = container;
+ QLIST_INSERT_HEAD(&container->group_list, group, container_next);
+ return 0;
+ }
+ }
+
+ fd = qemu_open("/dev/vfio/vfio", O_RDWR);
+ if (fd < 0) {
+ error_report("vfio: failed to open /dev/vfio/vfio: %s\n",
+ strerror(errno));
+ return -1;
+ }
+
+ ret = ioctl(fd, VFIO_GET_API_VERSION);
+ if (ret != VFIO_API_VERSION) {
+ error_report("vfio: supported vfio version: %d, "
+ "reported version: %d\n", VFIO_API_VERSION, ret);
+ close(fd);
+ return -1;
+ }
+
+ container = g_malloc0(sizeof(*container));
+ container->fd = fd;
+
+ if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU)) {
+ ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd);
+ if (ret) {
+ error_report("vfio: failed to set group container: %s\n",
+ strerror(errno));
+ g_free(container);
+ close(fd);
+ return -1;
+ }
+
+ ret = ioctl(fd, VFIO_SET_IOMMU, VFIO_TYPE1_IOMMU);
+ if (ret) {
+ error_report("vfio: failed to set iommu for container: %s\n",
+ strerror(errno));
+ g_free(container);
+ close(fd);
+ return -1;
+ }
+
+ container->iommu_data.listener = (MemoryListener) {
+ .begin = vfio_listener_dummy1,
+ .commit = vfio_listener_dummy1,
+ .region_add = vfio_listener_region_add,
+ .region_del = vfio_listener_region_del,
+ .region_nop = vfio_listener_dummy2,
+ .log_start = vfio_listener_dummy2,
+ .log_stop = vfio_listener_dummy2,
+ .log_sync = vfio_listener_dummy2,
+ .log_global_start = vfio_listener_dummy1,
+ .log_global_stop = vfio_listener_dummy1,
+ .eventfd_add = vfio_listener_dummy3,
+ .eventfd_del = vfio_listener_dummy3,
+ };
+ container->iommu_data.release = vfio_listener_release;
+
+ memory_listener_register(&container->iommu_data.listener,
+ get_system_memory());
+ } else {
+ error_report("vfio: No available IOMMU models\n");
+ g_free(container);
+ close(fd);
+ return -1;
+ }
+
+ QLIST_INIT(&container->group_list);
+ QLIST_INSERT_HEAD(&container_list, container, next);
+
+ group->container = container;
+ QLIST_INSERT_HEAD(&container->group_list, group, container_next);
+
+ return 0;
+}
+
+static void vfio_disconnect_container(VFIOGroup *group)
+{
+ VFIOContainer *container = group->container;
+
+ if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
+ error_report("vfio: error disconnecting group %d from container\n",
+ group->groupid);
+ }
+
+ QLIST_REMOVE(group, container_next);
+ group->container = NULL;
+
+ if (QLIST_EMPTY(&container->group_list)) {
+ if (container->iommu_data.release) {
+ container->iommu_data.release(container);
+ }
+ QLIST_REMOVE(container, next);
+ DPRINTF("vfio_disconnect_container: close container->fd\n");
+ close(container->fd);
+ g_free(container);
+ }
+}
+
+static VFIOGroup *vfio_get_group(int groupid)
+{
+ VFIOGroup *group;
+ char path[32];
+ struct vfio_group_status status = { .argsz = sizeof(status) };
+
+ QLIST_FOREACH(group, &group_list, next) {
+ if (group->groupid == groupid) {
+ return group;
+ }
+ }
+
+ group = g_malloc0(sizeof(*group));
+
+ snprintf(path, sizeof(path), "/dev/vfio/%d", groupid);
+ group->fd = qemu_open(path, O_RDWR);
+ if (group->fd < 0) {
+ error_report("vfio: error opening %s: %s", path, strerror(errno));
+ g_free(group);
+ return NULL;
+ }
+
+ if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
+ error_report("vfio: error getting group status: %s\n",
+ strerror(errno));
+ close(group->fd);
+ g_free(group);
+ return NULL;
+ }
+
+ if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
+ error_report("vfio: error, group %d is not viable, please ensure "
+ "all devices within the iommu_group are bound to their "
+ "vfio bus driver.\n", groupid);
+ close(group->fd);
+ g_free(group);
+ return NULL;
+ }
+
+ group->groupid = groupid;
+ QLIST_INIT(&group->device_list);
+
+ if (vfio_connect_container(group)) {
+ error_report("vfio: failed to setup container for group %d\n", groupid);
+ close(group->fd);
+ g_free(group);
+ return NULL;
+ }
+
+ QLIST_INSERT_HEAD(&group_list, group, next);
+
+ return group;
+}
+
+static void vfio_put_group(VFIOGroup *group)
+{
+ if (!QLIST_EMPTY(&group->device_list)) {
+ return;
+ }
+
+ vfio_disconnect_container(group);
+ QLIST_REMOVE(group, next);
+ DPRINTF("vfio_put_group: close group->fd\n");
+ close(group->fd);
+ g_free(group);
+}
+
+static int vfio_get_device(VFIOGroup *group, const char *name, VFIODevice *vdev)
+{
+ struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) };
+ struct vfio_region_info reg_info = { .argsz = sizeof(reg_info) };
+ int ret, i;
+
+ ret = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
+ if (ret < 0) {
+ error_report("vfio: error getting device %s from group %d: %s",
+ name, group->groupid, strerror(errno));
+ error_report("Verify all devices in group %d "
+ "are bound to vfio-pci or pci-stub and not already in use",
+ group->groupid);
+ return ret;
+ }
+
+ vdev->fd = ret;
+ vdev->group = group;
+ QLIST_INSERT_HEAD(&group->device_list, vdev, next);
+
+ /* Sanity check device */
+ ret = ioctl(vdev->fd, VFIO_DEVICE_GET_INFO, &dev_info);
+ if (ret) {
+ error_report("vfio: error getting device info: %s", strerror(errno));
+ goto error;
+ }
+
+ DPRINTF("Device %s flags: %u, regions: %u, irgs: %u\n", name,
+ dev_info.flags, dev_info.num_regions, dev_info.num_irqs);
+
+ if (!(dev_info.flags & VFIO_DEVICE_FLAGS_PCI)) {
+ error_report("vfio: Um, this isn't a PCI device");
+ goto error;
+ }
+
+ vdev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
+ if (!vdev->reset_works) {
+ error_report("Warning, device %s does not support reset\n", name);
+ }
+
+ if (dev_info.num_regions != VFIO_PCI_NUM_REGIONS) {
+ error_report("vfio: unexpected number of io regions %u",
+ dev_info.num_regions);
+ goto error;
+ }
+
+ if (dev_info.num_irqs != VFIO_PCI_NUM_IRQS) {
+ error_report("vfio: unexpected number of irqs %u", dev_info.num_irqs);
+ goto error;
+ }
+
+ for (i = VFIO_PCI_BAR0_REGION_INDEX; i < VFIO_PCI_ROM_REGION_INDEX; i++) {
+ reg_info.index = i;
+
+ ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, ®_info);
+ if (ret) {
+ error_report("vfio: Error getting region %d info: %s", i,
+ strerror(errno));
+ goto error;
+ }
+
+ DPRINTF("Device %s region %d:\n", name, i);
+ DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
+ (unsigned long)reg_info.size, (unsigned long)reg_info.offset,
+ (unsigned long)reg_info.flags);
+
+ vdev->bars[i].flags = reg_info.flags;
+ vdev->bars[i].size = reg_info.size;
+ vdev->bars[i].fd_offset = reg_info.offset;
+ vdev->bars[i].fd = vdev->fd;
+ vdev->bars[i].nr = i;
+ }
+
+ reg_info.index = VFIO_PCI_ROM_REGION_INDEX;
+
+ ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, ®_info);
+ if (ret) {
+ error_report("vfio: Error getting ROM info: %s", strerror(errno));
+ goto error;
+ }
+
+ DPRINTF("Device %s ROM:\n", name);
+ DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
+ (unsigned long)reg_info.size, (unsigned long)reg_info.offset,
+ (unsigned long)reg_info.flags);
+
+ vdev->rom_size = reg_info.size;
+ vdev->rom_offset = reg_info.offset;
+
+ reg_info.index = VFIO_PCI_CONFIG_REGION_INDEX;
+
+ ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, ®_info);
+ if (ret) {
+ error_report("vfio: Error getting config info: %s", strerror(errno));
+ goto error;
+ }
+
+ DPRINTF("Device %s config:\n", name);
+ DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
+ (unsigned long)reg_info.size, (unsigned long)reg_info.offset,
+ (unsigned long)reg_info.flags);
+
+ vdev->config_size = reg_info.size;
+ vdev->config_offset = reg_info.offset;
+
+error:
+ if (ret) {
+ QLIST_REMOVE(vdev, next);
+ vdev->group = NULL;
+ close(vdev->fd);
+ }
+ return ret;
+}
+
+static void vfio_put_device(VFIODevice *vdev)
+{
+ QLIST_REMOVE(vdev, next);
+ vdev->group = NULL;
+ DPRINTF("vfio_put_device: close vdev->fd\n");
+ close(vdev->fd);
+ if (vdev->msix) {
+ g_free(vdev->msix);
+ vdev->msix = NULL;
+ }
+}
+
+static int vfio_initfn(struct PCIDevice *pdev)
+{
+ VFIODevice *pvdev, *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
+ VFIOGroup *group;
+ char path[PATH_MAX], iommu_group_path[PATH_MAX], *group_name;
+ ssize_t len;
+ struct stat st;
+ int groupid;
+ int ret;
+
+ /* Check that the host device exists */
+ snprintf(path, sizeof(path),
+ "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/",
+ vdev->host.domain, vdev->host.bus, vdev->host.slot,
+ vdev->host.function);
+ if (stat(path, &st) < 0) {
+ error_report("vfio: error: no such host device: %s", path);
+ return -1;
+ }
+
+ strncat(path, "iommu_group", sizeof(path) - strlen(path) - 1);
+
+ len = readlink(path, iommu_group_path, PATH_MAX);
+ if (len <= 0) {
+ error_report("vfio: error no iommu_group for device\n");
+ return -1;
+ }
+
+ iommu_group_path[len] = 0;
+ group_name = basename(iommu_group_path);
+
+ if (sscanf(group_name, "%d", &groupid) != 1) {
+ error_report("vfio: error reading %s: %s", path, strerror(errno));
+ return -1;
+ }
+
+ DPRINTF("%s(%04x:%02x:%02x.%x) group %d\n", __func__, vdev->host.domain,
+ vdev->host.bus, vdev->host.slot, vdev->host.function, groupid);
+
+ group = vfio_get_group(groupid);
+ if (!group) {
+ error_report("vfio: failed to get group %d", groupid);
+ return -1;
+ }
+
+ snprintf(path, sizeof(path), "%04x:%02x:%02x.%01x",
+ vdev->host.domain, vdev->host.bus, vdev->host.slot,
+ vdev->host.function);
+
+ QLIST_FOREACH(pvdev, &group->device_list, next) {
+ if (pvdev->host.domain == vdev->host.domain &&
+ pvdev->host.bus == vdev->host.bus &&
+ pvdev->host.slot == vdev->host.slot &&
+ pvdev->host.function == vdev->host.function) {
+
+ error_report("vfio: error: device %s is already attached\n", path);
+ vfio_put_group(group);
+ return -1;
+ }
+ }
+
+ ret = vfio_get_device(group, path, vdev);
+ if (ret) {
+ error_report("vfio: failed to get device %s", path);
+ vfio_put_group(group);
+ return -1;
+ }
+
+ /* Get a copy of config space */
+ assert(pci_config_size(&vdev->pdev) <= vdev->config_size);
+ ret = pread(vdev->fd, vdev->pdev.config,
+ pci_config_size(&vdev->pdev), vdev->config_offset);
+ if (ret < (int)pci_config_size(&vdev->pdev)) {
+ error_report("vfio: Failed to read device config space\n");
+ goto out_put;
+ }
+
+ /*
+ * Clear host resource mapping info. If we choose not to register a
+ * BAR, such as might be the case with the option ROM, we can get
+ * confusing, unwritable, residual addresses from the host here.
+ */
+ memset(&vdev->pdev.config[PCI_BASE_ADDRESS_0], 0, 24);
+ memset(&vdev->pdev.config[PCI_ROM_ADDRESS], 0, 4);
+
+ vfio_load_rom(vdev);
+
+ if (vfio_early_setup_msix(vdev)) {
+ goto out_put;
+ }
+
+ vfio_map_bars(vdev);
+
+ if (vfio_add_capabilities(vdev)) {
+ goto out_teardown;
+ }
+
+ if (vfio_pci_read_config(&vdev->pdev, PCI_INTERRUPT_PIN, 1)) {
+ pci_device_set_intx_routing_notifier(&vdev->pdev, vfio_update_irq);
+ }
+
+ if (vfio_enable_intx(vdev)) {
+ goto out_teardown;
+ }
+
+ return 0;
+
+out_teardown:
+ pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
+ vfio_teardown_msi(vdev);
+ vfio_unmap_bars(vdev);
+out_put:
+ vfio_put_device(vdev);
+ vfio_put_group(group);
+ return -1;
+}
+
+static void vfio_exitfn(struct PCIDevice *pdev)
+{
+ VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
+ VFIOGroup *group = vdev->group;
+
+ pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
+ vfio_disable_interrupts(vdev);
+ vfio_teardown_msi(vdev);
+ vfio_unmap_bars(vdev);
+ vfio_put_device(vdev);
+ vfio_put_group(group);
+}
+
+static void vfio_reset(DeviceState *dev)
+{
+ PCIDevice *pdev = DO_UPCAST(PCIDevice, qdev, dev);
+ VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
+
+ if (!vdev->reset_works) {
+ return;
+ }
+
+ if (ioctl(vdev->fd, VFIO_DEVICE_RESET)) {
+ error_report("vfio: Error unable to reset physical device "
+ "(%04x:%02x:%02x.%x): %s\n", vdev->host.domain,
+ vdev->host.bus, vdev->host.slot, vdev->host.function,
+ strerror(errno));
+ }
+}
+
+static Property vfio_pci_dev_properties[] = {
+ DEFINE_PROP_PCI_HOST_DEVADDR("host", VFIODevice, host),
+ /*
+ * TODO - support passed fds... is this necessary?
+ * DEFINE_PROP_STRING("vfiofd", VFIODevice, vfiofd_name),
+ * DEFINE_PROP_STRING("vfiogroupfd, VFIODevice, vfiogroupfd_name),
+ */
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+
+static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
+{
+ PCIDeviceClass *dc = PCI_DEVICE_CLASS(klass);
+
+ dc->parent_class.reset = vfio_reset;
+ dc->init = vfio_initfn;
+ dc->exit = vfio_exitfn;
+ dc->config_read = vfio_pci_read_config;
+ dc->config_write = vfio_pci_write_config;
+ dc->parent_class.props = vfio_pci_dev_properties;
+}
+
+static TypeInfo vfio_pci_dev_info = {
+ .name = "vfio-pci",
+ .parent = TYPE_PCI_DEVICE,
+ .instance_size = sizeof(VFIODevice),
+ .class_init = vfio_pci_dev_class_init,
+};
+
+static void register_vfio_pci_dev_type(void)
+{
+ type_register_static(&vfio_pci_dev_info);
+}
+
+type_init(register_vfio_pci_dev_type)
diff --git a/hw/vfio_pci.h b/hw/vfio_pci.h
new file mode 100644
index 0000000..0a71bce
--- /dev/null
+++ b/hw/vfio_pci.h
@@ -0,0 +1,101 @@
+#ifndef HW_VFIO_PCI_H
+#define HW_VFIO_PCI_H
+
+#include "qemu-common.h"
+#include "qemu-queue.h"
+#include "pci.h"
+#include "event_notifier.h"
+
+typedef struct VFIOBAR {
+ off_t fd_offset; /* offset of BAR within device fd */
+ int fd; /* device fd, allows us to pass VFIOBAR as opaque data */
+ MemoryRegion mem; /* slow, read/write access */
+ MemoryRegion mmap_mem; /* direct mapped access */
+ void *mmap;
+ size_t size;
+ uint32_t flags; /* VFIO region flags (rd/wr/mmap) */
+ uint8_t nr; /* cache the BAR number for debug */
+} VFIOBAR;
+
+typedef struct INTx {
+ bool pending; /* interrupt pending */
+ bool kvm_accel; /* set when QEMU bypass through KVM enabled */
+ uint8_t pin; /* which pin to pull for qemu_set_irq */
+ EventNotifier interrupt; /* eventfd triggered on interrupt */
+ EventNotifier unmask; /* eventfd for unmask on QEMU bypass */
+ PCIINTxRoute route; /* routing info for QEMU bypass */
+} INTx;
+
+struct VFIODevice;
+
+typedef struct MSIVector {
+ EventNotifier interrupt; /* eventfd triggered on interrupt */
+ struct VFIODevice *vdev; /* back pointer to device */
+ int vector; /* the vector number for this element */
+ int virq; /* KVM irqchip route for QEMU bypass */
+ bool use;
+} MSIVector;
+
+enum {
+ INT_NONE = 0,
+ INT_INTx = 1,
+ INT_MSI = 2,
+ INT_MSIX = 3,
+};
+
+struct VFIOGroup;
+
+typedef struct VFIOContainer {
+ int fd; /* /dev/vfio/vfio, empowered by the attached groups */
+ struct {
+ /* enable abstraction to support various iommu backends */
+ union {
+ MemoryListener listener; /* Used by type1 iommu */
+ };
+ void (*release)(struct VFIOContainer *);
+ } iommu_data;
+ QLIST_HEAD(, VFIOGroup) group_list;
+ QLIST_ENTRY(VFIOContainer) next;
+} VFIOContainer;
+
+/* Cache of MSI-X setup plus extra mmap and memory region for split BAR map */
+typedef struct MSIXInfo {
+ uint8_t table_bar;
+ uint8_t pba_bar;
+ uint16_t entries;
+ uint32_t table_offset;
+ uint32_t pba_offset;
+ MemoryRegion mmap_mem;
+ void *mmap;
+} MSIXInfo;
+
+typedef struct VFIODevice {
+ PCIDevice pdev;
+ int fd;
+ INTx intx;
+ unsigned int config_size;
+ off_t config_offset; /* Offset of config space region within device fd */
+ unsigned int rom_size;
+ off_t rom_offset; /* Offset of ROM region within device fd */
+ int msi_cap_size;
+ MSIVector *msi_vectors;
+ MSIXInfo *msix;
+ int nr_vectors; /* Number of MSI/MSIX vectors currently in use */
+ int interrupt; /* Current interrupt type */
+ VFIOBAR bars[PCI_NUM_REGIONS - 1]; /* No ROM */
+ PCIHostDeviceAddress host;
+ QLIST_ENTRY(VFIODevice) next;
+ struct VFIOGroup *group;
+ bool reset_works;
+} VFIODevice;
+
+typedef struct VFIOGroup {
+ int fd;
+ int groupid;
+ VFIOContainer *container;
+ QLIST_HEAD(, VFIODevice) device_list;
+ QLIST_ENTRY(VFIOGroup) next;
+ QLIST_ENTRY(VFIOGroup) container_next;
+} VFIOGroup;
+
+#endif /* HW_VFIO_PCI_H */
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
