Merge remote-tracking branch 'remotes/awilliam/tags/vfio-pci-for-qemu-20140630.0' into staging
VFIO patches: MSI-X masking performance fix, Endian fixes, fix runstate on device error
# gpg: Signature made Mon 30 Jun 2014 18:13:40 BST using RSA key ID 3BB08B22
# gpg: Can't check signature: public key not found
* remotes/awilliam/tags/vfio-pci-for-qemu-20140630.0:
vfio: use correct runstate
vfio: Make BARs native endian
vfio-pci: Fix MSI-X masking performance
vfio-pci: Fix MSI/X debug code
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
diff --git a/hw/misc/vfio.c b/hw/misc/vfio.c
index 7b279c4..aef4c9c 100644
--- a/hw/misc/vfio.c
+++ b/hw/misc/vfio.c
@@ -121,6 +121,7 @@
typedef struct VFIOMSIVector {
EventNotifier interrupt; /* eventfd triggered on interrupt */
+ EventNotifier kvm_interrupt; /* eventfd triggered for KVM irqfd bypass */
struct VFIODevice *vdev; /* back pointer to device */
MSIMessage msg; /* cache the MSI message so we know when it changes */
int virq; /* KVM irqchip route for QEMU bypass */
@@ -642,9 +643,9 @@
MSIMessage msg;
if (vdev->interrupt == VFIO_INT_MSIX) {
- msg = msi_get_message(&vdev->pdev, nr);
- } else if (vdev->interrupt == VFIO_INT_MSI) {
msg = msix_get_message(&vdev->pdev, nr);
+ } else if (vdev->interrupt == VFIO_INT_MSI) {
+ msg = msi_get_message(&vdev->pdev, nr);
} else {
abort();
}
@@ -682,10 +683,11 @@
for (i = 0; i < vdev->nr_vectors; i++) {
if (!vdev->msi_vectors[i].use) {
fds[i] = -1;
- continue;
+ } else if (vdev->msi_vectors[i].virq >= 0) {
+ fds[i] = event_notifier_get_fd(&vdev->msi_vectors[i].kvm_interrupt);
+ } else {
+ fds[i] = event_notifier_get_fd(&vdev->msi_vectors[i].interrupt);
}
-
- fds[i] = event_notifier_get_fd(&vdev->msi_vectors[i].interrupt);
}
ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
@@ -695,6 +697,52 @@
return ret;
}
+static void vfio_add_kvm_msi_virq(VFIOMSIVector *vector, MSIMessage *msg,
+ bool msix)
+{
+ int virq;
+
+ if ((msix && !VFIO_ALLOW_KVM_MSIX) ||
+ (!msix && !VFIO_ALLOW_KVM_MSI) || !msg) {
+ return;
+ }
+
+ if (event_notifier_init(&vector->kvm_interrupt, 0)) {
+ return;
+ }
+
+ virq = kvm_irqchip_add_msi_route(kvm_state, *msg);
+ if (virq < 0) {
+ event_notifier_cleanup(&vector->kvm_interrupt);
+ return;
+ }
+
+ if (kvm_irqchip_add_irqfd_notifier(kvm_state, &vector->kvm_interrupt,
+ NULL, virq) < 0) {
+ kvm_irqchip_release_virq(kvm_state, virq);
+ event_notifier_cleanup(&vector->kvm_interrupt);
+ return;
+ }
+
+ vector->msg = *msg;
+ vector->virq = virq;
+}
+
+static void vfio_remove_kvm_msi_virq(VFIOMSIVector *vector)
+{
+ kvm_irqchip_remove_irqfd_notifier(kvm_state, &vector->kvm_interrupt,
+ vector->virq);
+ kvm_irqchip_release_virq(kvm_state, vector->virq);
+ vector->virq = -1;
+ event_notifier_cleanup(&vector->kvm_interrupt);
+}
+
+static void vfio_update_kvm_msi_virq(VFIOMSIVector *vector, MSIMessage msg)
+{
+ kvm_irqchip_update_msi_route(kvm_state, vector->virq, msg);
+ vector->msg = msg;
+}
+
static int vfio_msix_vector_do_use(PCIDevice *pdev, unsigned int nr,
MSIMessage *msg, IOHandler *handler)
{
@@ -707,30 +755,32 @@
vdev->host.function, nr);
vector = &vdev->msi_vectors[nr];
- vector->vdev = vdev;
- vector->use = true;
- msix_vector_use(pdev, nr);
-
- if (event_notifier_init(&vector->interrupt, 0)) {
- error_report("vfio: Error: event_notifier_init failed");
+ if (!vector->use) {
+ vector->vdev = vdev;
+ vector->virq = -1;
+ if (event_notifier_init(&vector->interrupt, 0)) {
+ error_report("vfio: Error: event_notifier_init failed");
+ }
+ vector->use = true;
+ msix_vector_use(pdev, nr);
}
+ qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
+ handler, NULL, vector);
+
/*
* Attempt to enable route through KVM irqchip,
* default to userspace handling if unavailable.
*/
- vector->virq = msg && VFIO_ALLOW_KVM_MSIX ?
- kvm_irqchip_add_msi_route(kvm_state, *msg) : -1;
- if (vector->virq < 0 ||
- kvm_irqchip_add_irqfd_notifier(kvm_state, &vector->interrupt,
- NULL, vector->virq) < 0) {
- if (vector->virq >= 0) {
- kvm_irqchip_release_virq(kvm_state, vector->virq);
- vector->virq = -1;
+ if (vector->virq >= 0) {
+ if (!msg) {
+ vfio_remove_kvm_msi_virq(vector);
+ } else {
+ vfio_update_kvm_msi_virq(vector, *msg);
}
- qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
- handler, NULL, vector);
+ } else {
+ vfio_add_kvm_msi_virq(vector, msg, true);
}
/*
@@ -761,7 +811,11 @@
irq_set->count = 1;
pfd = (int32_t *)&irq_set->data;
- *pfd = event_notifier_get_fd(&vector->interrupt);
+ if (vector->virq >= 0) {
+ *pfd = event_notifier_get_fd(&vector->kvm_interrupt);
+ } else {
+ *pfd = event_notifier_get_fd(&vector->interrupt);
+ }
ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
g_free(irq_set);
@@ -783,50 +837,41 @@
{
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
VFIOMSIVector *vector = &vdev->msi_vectors[nr];
- int argsz;
- struct vfio_irq_set *irq_set;
- int32_t *pfd;
DPRINTF("%s(%04x:%02x:%02x.%x) vector %d released\n", __func__,
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function, nr);
/*
- * 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.
+ * There are still old guests that mask and unmask vectors on every
+ * interrupt. If we're using QEMU bypass with a KVM irqfd, leave all of
+ * the KVM setup in place, simply switch VFIO to use the non-bypass
+ * eventfd. We'll then fire the interrupt through QEMU and the MSI-X
+ * core will mask the interrupt and set pending bits, allowing it to
+ * be re-asserted on unmask. Nothing to do if already using QEMU mode.
*/
- msix_vector_unuse(pdev, nr);
+ if (vector->virq >= 0) {
+ int argsz;
+ struct vfio_irq_set *irq_set;
+ int32_t *pfd;
- argsz = sizeof(*irq_set) + sizeof(*pfd);
+ argsz = sizeof(*irq_set) + sizeof(*pfd);
- 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 = VFIO_PCI_MSIX_IRQ_INDEX;
- irq_set->start = nr;
- irq_set->count = 1;
- pfd = (int32_t *)&irq_set->data;
+ 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 = VFIO_PCI_MSIX_IRQ_INDEX;
+ irq_set->start = nr;
+ irq_set->count = 1;
+ pfd = (int32_t *)&irq_set->data;
- *pfd = -1;
+ *pfd = event_notifier_get_fd(&vector->interrupt);
- ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
+ ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
- g_free(irq_set);
-
- if (vector->virq < 0) {
- qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
- NULL, NULL, NULL);
- } else {
- kvm_irqchip_remove_irqfd_notifier(kvm_state, &vector->interrupt,
- vector->virq);
- kvm_irqchip_release_virq(kvm_state, vector->virq);
- vector->virq = -1;
+ g_free(irq_set);
}
-
- event_notifier_cleanup(&vector->interrupt);
- vector->use = false;
}
static void vfio_enable_msix(VFIODevice *vdev)
@@ -876,28 +921,28 @@
VFIOMSIVector *vector = &vdev->msi_vectors[i];
vector->vdev = vdev;
+ vector->virq = -1;
vector->use = true;
if (event_notifier_init(&vector->interrupt, 0)) {
error_report("vfio: Error: event_notifier_init failed");
}
+ qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
+ vfio_msi_interrupt, NULL, vector);
+
vector->msg = msi_get_message(&vdev->pdev, i);
/*
* Attempt to enable route through KVM irqchip,
* default to userspace handling if unavailable.
*/
- vector->virq = VFIO_ALLOW_KVM_MSI ?
- kvm_irqchip_add_msi_route(kvm_state, vector->msg) : -1;
- if (vector->virq < 0 ||
- kvm_irqchip_add_irqfd_notifier(kvm_state, &vector->interrupt,
- NULL, vector->virq) < 0) {
- qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
- vfio_msi_interrupt, NULL, vector);
- }
+ vfio_add_kvm_msi_virq(vector, &vector->msg, false);
}
+ /* Set interrupt type prior to possible interrupts */
+ vdev->interrupt = VFIO_INT_MSI;
+
ret = vfio_enable_vectors(vdev, false);
if (ret) {
if (ret < 0) {
@@ -910,14 +955,10 @@
for (i = 0; i < vdev->nr_vectors; i++) {
VFIOMSIVector *vector = &vdev->msi_vectors[i];
if (vector->virq >= 0) {
- kvm_irqchip_remove_irqfd_notifier(kvm_state, &vector->interrupt,
- vector->virq);
- kvm_irqchip_release_virq(kvm_state, vector->virq);
- vector->virq = -1;
- } else {
- qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
- NULL, NULL, NULL);
+ vfio_remove_kvm_msi_virq(vector);
}
+ qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
+ NULL, NULL, NULL);
event_notifier_cleanup(&vector->interrupt);
}
@@ -929,11 +970,17 @@
}
vdev->nr_vectors = 0;
+ /*
+ * Failing to setup MSI doesn't really fall within any specification.
+ * Let's try leaving interrupts disabled and hope the guest figures
+ * out to fall back to INTx for this device.
+ */
+ error_report("vfio: Error: Failed to enable MSI");
+ vdev->interrupt = VFIO_INT_NONE;
+
return;
}
- vdev->interrupt = VFIO_INT_MSI;
-
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);
@@ -941,6 +988,20 @@
static void vfio_disable_msi_common(VFIODevice *vdev)
{
+ int i;
+
+ for (i = 0; i < vdev->nr_vectors; i++) {
+ VFIOMSIVector *vector = &vdev->msi_vectors[i];
+ if (vdev->msi_vectors[i].use) {
+ if (vector->virq >= 0) {
+ vfio_remove_kvm_msi_virq(vector);
+ }
+ qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
+ NULL, NULL, NULL);
+ event_notifier_cleanup(&vector->interrupt);
+ }
+ }
+
g_free(vdev->msi_vectors);
vdev->msi_vectors = NULL;
vdev->nr_vectors = 0;
@@ -962,6 +1023,7 @@
for (i = 0; i < vdev->nr_vectors; i++) {
if (vdev->msi_vectors[i].use) {
vfio_msix_vector_release(&vdev->pdev, i);
+ msix_vector_unuse(&vdev->pdev, i);
}
}
@@ -977,30 +1039,7 @@
static void vfio_disable_msi(VFIODevice *vdev)
{
- int i;
-
vfio_disable_irqindex(vdev, VFIO_PCI_MSI_IRQ_INDEX);
-
- for (i = 0; i < vdev->nr_vectors; i++) {
- VFIOMSIVector *vector = &vdev->msi_vectors[i];
-
- if (!vector->use) {
- continue;
- }
-
- if (vector->virq >= 0) {
- kvm_irqchip_remove_irqfd_notifier(kvm_state,
- &vector->interrupt, vector->virq);
- kvm_irqchip_release_virq(kvm_state, vector->virq);
- vector->virq = -1;
- } else {
- qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
- NULL, NULL, NULL);
- }
-
- event_notifier_cleanup(&vector->interrupt);
- }
-
vfio_disable_msi_common(vdev);
DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
@@ -1020,17 +1059,7 @@
}
msg = msi_get_message(&vdev->pdev, i);
-
- if (msg.address != vector->msg.address ||
- msg.data != vector->msg.data) {
-
- DPRINTF("%s(%04x:%02x:%02x.%x) MSI vector %d changed\n",
- __func__, vdev->host.domain, vdev->host.bus,
- vdev->host.slot, vdev->host.function, i);
-
- kvm_irqchip_update_msi_route(kvm_state, vector->virq, msg);
- vector->msg = msg;
- }
+ vfio_update_kvm_msi_virq(vector, msg);
}
}
@@ -1053,10 +1082,10 @@
buf.byte = data;
break;
case 2:
- buf.word = cpu_to_le16(data);
+ buf.word = data;
break;
case 4:
- buf.dword = cpu_to_le32(data);
+ buf.dword = data;
break;
default:
hw_error("vfio: unsupported write size, %d bytes", size);
@@ -1113,10 +1142,10 @@
data = buf.byte;
break;
case 2:
- data = le16_to_cpu(buf.word);
+ data = buf.word;
break;
case 4:
- data = le32_to_cpu(buf.dword);
+ data = buf.dword;
break;
default:
hw_error("vfio: unsupported read size, %d bytes", size);
@@ -1143,7 +1172,7 @@
static const MemoryRegionOps vfio_bar_ops = {
.read = vfio_bar_read,
.write = vfio_bar_write,
- .endianness = DEVICE_LITTLE_ENDIAN,
+ .endianness = DEVICE_NATIVE_ENDIAN,
};
static void vfio_pci_load_rom(VFIODevice *vdev)
@@ -1205,21 +1234,42 @@
static uint64_t vfio_rom_read(void *opaque, hwaddr addr, unsigned size)
{
VFIODevice *vdev = opaque;
- uint64_t val = ((uint64_t)1 << (size * 8)) - 1;
+ union {
+ uint8_t byte;
+ uint16_t word;
+ uint32_t dword;
+ uint64_t qword;
+ } buf;
+ uint64_t data = 0;
/* Load the ROM lazily when the guest tries to read it */
if (unlikely(!vdev->rom && !vdev->rom_read_failed)) {
vfio_pci_load_rom(vdev);
}
- memcpy(&val, vdev->rom + addr,
+ memcpy(&buf, vdev->rom + addr,
(addr < vdev->rom_size) ? MIN(size, vdev->rom_size - addr) : 0);
+ switch (size) {
+ case 1:
+ data = buf.byte;
+ break;
+ case 2:
+ data = buf.word;
+ break;
+ case 4:
+ data = buf.dword;
+ break;
+ default:
+ hw_error("vfio: unsupported read size, %d bytes", size);
+ break;
+ }
+
DPRINTF("%s(%04x:%02x:%02x.%x, 0x%"HWADDR_PRIx", 0x%x) = 0x%"PRIx64"\n",
__func__, vdev->host.domain, vdev->host.bus, vdev->host.slot,
- vdev->host.function, addr, size, val);
+ vdev->host.function, addr, size, data);
- return val;
+ return data;
}
static void vfio_rom_write(void *opaque, hwaddr addr,
@@ -1230,7 +1280,7 @@
static const MemoryRegionOps vfio_rom_ops = {
.read = vfio_rom_read,
.write = vfio_rom_write,
- .endianness = DEVICE_LITTLE_ENDIAN,
+ .endianness = DEVICE_NATIVE_ENDIAN,
};
static bool vfio_blacklist_opt_rom(VFIODevice *vdev)
@@ -4012,7 +4062,7 @@
__func__, vdev->host.domain, vdev->host.bus,
vdev->host.slot, vdev->host.function);
- vm_stop(RUN_STATE_IO_ERROR);
+ vm_stop(RUN_STATE_INTERNAL_ERROR);
}
/*
