vhost irqfd support: case where many vqs are
mapped to a single msix vector is currently broken.
Fix it up.
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
---
This is on top of the qemu patchset, which is unchanged.
Fixes from v1:
correct error handling
hw/msix.c | 68 ++++++++++++++++++++++++++++++++++++++-----------------
hw/msix.h | 4 +-
hw/pci.h | 3 +-
hw/virtio-pci.c | 56 ++++++++++++++++++++++++++++++++++++++-------
4 files changed, 97 insertions(+), 34 deletions(-)
diff --git a/hw/msix.c b/hw/msix.c
index 3dd0456..3d4dd61 100644
--- a/hw/msix.c
+++ b/hw/msix.c
@@ -300,10 +300,8 @@ static void msix_mmio_writel(void *opaque, target_phys_addr_t addr,
if (kvm_enabled() && kvm_irqchip_in_kernel()) {
kvm_msix_update(dev, vector, was_masked, msix_is_masked(dev, vector));
}
- if (was_masked != msix_is_masked(dev, vector) &&
- dev->msix_mask_notifier && dev->msix_mask_notifier_opaque[vector]) {
+ if (was_masked != msix_is_masked(dev, vector) && dev->msix_mask_notifier) {
int r = dev->msix_mask_notifier(dev, vector,
- dev->msix_mask_notifier_opaque[vector],
msix_is_masked(dev, vector));
assert(r >= 0);
}
@@ -351,9 +349,8 @@ static void msix_mask_all(struct PCIDevice *dev, unsigned nentries)
int was_masked = msix_is_masked(dev, vector);
dev->msix_table_page[offset] |= MSIX_VECTOR_MASK;
if (was_masked != msix_is_masked(dev, vector) &&
- dev->msix_mask_notifier && dev->msix_mask_notifier_opaque[vector]) {
+ dev->msix_mask_notifier) {
r = dev->msix_mask_notifier(dev, vector,
- dev->msix_mask_notifier_opaque[vector],
msix_is_masked(dev, vector));
assert(r >= 0);
}
@@ -379,8 +376,6 @@ int msix_init(struct PCIDevice *dev, unsigned short nentries,
sizeof *dev->msix_irq_entries);
}
#endif
- dev->msix_mask_notifier_opaque =
- qemu_mallocz(nentries * sizeof *dev->msix_mask_notifier_opaque);
dev->msix_mask_notifier = NULL;
dev->msix_entry_used = qemu_mallocz(MSIX_MAX_ENTRIES *
sizeof *dev->msix_entry_used);
@@ -444,8 +439,6 @@ int msix_uninit(PCIDevice *dev)
dev->msix_entry_used = NULL;
qemu_free(dev->msix_irq_entries);
dev->msix_irq_entries = NULL;
- qemu_free(dev->msix_mask_notifier_opaque);
- dev->msix_mask_notifier_opaque = NULL;
dev->cap_present &= ~QEMU_PCI_CAP_MSIX;
return 0;
}
@@ -590,46 +583,79 @@ void msix_unuse_all_vectors(PCIDevice *dev)
msix_free_irq_entries(dev);
}
-int msix_set_mask_notifier(PCIDevice *dev, unsigned vector, void *opaque)
+static int msix_set_mask_notifier_for_vector(PCIDevice *dev, unsigned vector)
{
int r = 0;
if (vector >= dev->msix_entries_nr || !dev->msix_entry_used[vector])
return 0;
assert(dev->msix_mask_notifier);
- assert(opaque);
- assert(!dev->msix_mask_notifier_opaque[vector]);
/* Unmask the new notifier unless vector is masked. */
if (!msix_is_masked(dev, vector)) {
- r = dev->msix_mask_notifier(dev, vector, opaque, false);
+ r = dev->msix_mask_notifier(dev, vector, false);
if (r < 0) {
return r;
}
}
- dev->msix_mask_notifier_opaque[vector] = opaque;
return r;
}
-int msix_unset_mask_notifier(PCIDevice *dev, unsigned vector)
+static int msix_unset_mask_notifier_for_vector(PCIDevice *dev, unsigned vector)
{
int r = 0;
- void *opaque;
if (vector >= dev->msix_entries_nr || !dev->msix_entry_used[vector])
return 0;
- opaque = dev->msix_mask_notifier_opaque[vector];
-
assert(dev->msix_mask_notifier);
- assert(opaque);
/* Mask the old notifier unless it is already masked. */
if (!msix_is_masked(dev, vector)) {
- r = dev->msix_mask_notifier(dev, vector, opaque, true);
+ r = dev->msix_mask_notifier(dev, vector, true);
if (r < 0) {
return r;
}
}
- dev->msix_mask_notifier_opaque[vector] = NULL;
+ return r;
+}
+
+int msix_set_mask_notifier(PCIDevice *dev, msix_mask_notifier_func f)
+{
+ int r, n;
+ assert(!dev->msix_mask_notifier);
+ dev->msix_mask_notifier = f;
+ for (n = 0; n < dev->msix_entries_nr; ++n) {
+ r = msix_set_mask_notifier_for_vector(dev, n);
+ if (r < 0) {
+ goto undo;
+ }
+ }
+ return 0;
+
+undo:
+ while (--n >= 0) {
+ msix_unset_mask_notifier_for_vector(dev, n);
+ }
+ dev->msix_mask_notifier = NULL;
+ return r;
+}
+
+int msix_unset_mask_notifier(PCIDevice *dev)
+{
+ int r, n;
+ assert(dev->msix_mask_notifier);
+ for (n = 0; n < dev->msix_entries_nr; ++n) {
+ r = msix_unset_mask_notifier_for_vector(dev, n);
+ if (r < 0) {
+ goto undo;
+ }
+ }
+ dev->msix_mask_notifier = NULL;
+ return 0;
+
+undo:
+ while (--n >= 0) {
+ msix_set_mask_notifier_for_vector(dev, n);
+ }
return r;
}
diff --git a/hw/msix.h b/hw/msix.h
index 6b21ffb..5a81df5 100644
--- a/hw/msix.h
+++ b/hw/msix.h
@@ -33,6 +33,6 @@ void msix_reset(PCIDevice *dev);
extern int msix_supported;
-int msix_set_mask_notifier(PCIDevice *dev, unsigned vector, void *opaque);
-int msix_unset_mask_notifier(PCIDevice *dev, unsigned vector);
+int msix_set_mask_notifier(PCIDevice *dev, msix_mask_notifier_func);
+int msix_unset_mask_notifier(PCIDevice *dev);
#endif
diff --git a/hw/pci.h b/hw/pci.h
index ccb99d0..a40dc14 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -131,7 +131,7 @@ enum {
#define PCI_CAPABILITY_CONFIG_MSIX_LENGTH 0x10
typedef int (*msix_mask_notifier_func)(PCIDevice *, unsigned vector,
- void *opaque, int masked);
+ int masked);
struct PCIDevice {
DeviceState qdev;
@@ -198,7 +198,6 @@ struct PCIDevice {
struct kvm_irq_routing_entry *msix_irq_entries;
- void **msix_mask_notifier_opaque;
msix_mask_notifier_func msix_mask_notifier;
/* Device capability configuration space */
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index 232f943..c1204ce 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -428,11 +428,10 @@ static void virtio_pci_guest_notifier_read(void *opaque)
}
}
-static int virtio_pci_mask_notifier(PCIDevice *dev, unsigned vector,
- void *opaque, int masked)
+static int virtio_pci_mask_vq(PCIDevice *dev, unsigned vector,
+ VirtQueue *vq, int masked)
{
#ifdef CONFIG_KVM
- VirtQueue *vq = opaque;
EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
int r = kvm_set_irqfd(dev->msix_irq_entries[vector].gsi,
event_notifier_get_fd(notifier),
@@ -453,6 +452,34 @@ static int virtio_pci_mask_notifier(PCIDevice *dev, unsigned vector,
#endif
}
+static int virtio_pci_mask_notifier(PCIDevice *dev, unsigned vector,
+ int masked)
+{
+ VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
+ VirtIODevice *vdev = proxy->vdev;
+ int r, n;
+
+ for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
+ if (!virtio_queue_get_num(vdev, n)) {
+ break;
+ }
+ if (virtio_queue_vector(vdev, n) != vector) {
+ continue;
+ }
+ r = virtio_pci_mask_vq(dev, vector, virtio_get_queue(vdev, n), masked);
+ if (r < 0) {
+ goto undo;
+ }
+ }
+ return 0;
+undo:
+ while (--n >= 0) {
+ virtio_pci_mask_vq(dev, vector, virtio_get_queue(vdev, n), !masked);
+ }
+ return r;
+}
+
+
static int virtio_pci_set_guest_notifier(void *opaque, int n, bool assign)
{
VirtIOPCIProxy *proxy = opaque;
@@ -466,11 +493,7 @@ static int virtio_pci_set_guest_notifier(void *opaque, int n, bool assign)
}
qemu_set_fd_handler(event_notifier_get_fd(notifier),
virtio_pci_guest_notifier_read, NULL, vq);
- msix_set_mask_notifier(&proxy->pci_dev,
- virtio_queue_vector(proxy->vdev, n), vq);
} else {
- msix_unset_mask_notifier(&proxy->pci_dev,
- virtio_queue_vector(proxy->vdev, n));
qemu_set_fd_handler(event_notifier_get_fd(notifier),
NULL, NULL, NULL);
/* Test and clear notifier before closing it,
@@ -488,6 +511,13 @@ static int virtio_pci_set_guest_notifiers(void *opaque, bool assign)
VirtIODevice *vdev = proxy->vdev;
int r, n;
+ /* Must unset mask notifier while guest notifier
+ * is still assigned */
+ if (!assign) {
+ r = msix_unset_mask_notifier(&proxy->pci_dev);
+ assert(r >= 0);
+ }
+
for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
if (!virtio_queue_get_num(vdev, n)) {
break;
@@ -499,6 +529,16 @@ static int virtio_pci_set_guest_notifiers(void *opaque, bool assign)
}
}
+ /* Must set mask notifier after guest notifier
+ * has been assigned */
+ if (assign) {
+ r = msix_set_mask_notifier(&proxy->pci_dev,
+ virtio_pci_mask_notifier);
+ if (r < 0) {
+ goto assign_error;
+ }
+ }
+
return 0;
assign_error:
@@ -584,8 +624,6 @@ static void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev,
proxy->pci_dev.config_write = virtio_write_config;
- proxy->pci_dev.msix_mask_notifier = virtio_pci_mask_notifier;
-
size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev) + vdev->config_len;
if (size & (size-1))
size = 1 << qemu_fls(size);
--
1.7.3-rc1
--
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