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[Qemu-devel] [PATCH 2/3] virtio-pci: Add virtio_queue_valid checks ahead
From: |
Nicholas A. Bellinger |
Subject: |
[Qemu-devel] [PATCH 2/3] virtio-pci: Add virtio_queue_valid checks ahead of virtio_queue_get_num |
Date: |
Fri, 29 Mar 2013 04:33:11 +0000 |
From: Nicholas Bellinger <address@hidden>
This patch adds a number of virtio_queue_valid() checks to virtio-pci
ahead of virtio_queue_get_num() usage in order to skip operation upon
the detection of an uninitialized VQ.
There is one exception in virtio_ioport_read():VIRTIO_PCI_QUEUE_NUM,
where virtio_queue_get_num() may still be called without a valid
vdev->vq[n].vring.desc physical address.
Cc: Michael S. Tsirkin <address@hidden>
Cc: Asias He <address@hidden>
Cc: Paolo Bonzini <address@hidden>
Signed-off-by: Nicholas Bellinger <address@hidden>
---
hw/virtio-pci.c | 27 +++++++++++++++++++++++++++
1 files changed, 27 insertions(+), 0 deletions(-)
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index 0d67b84..231ca0c 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -211,6 +211,9 @@ static void virtio_pci_start_ioeventfd(VirtIOPCIProxy
*proxy)
}
for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
+ if (!virtio_queue_valid(proxy->vdev, n)) {
+ continue;
+ }
if (!virtio_queue_get_num(proxy->vdev, n)) {
continue;
}
@@ -225,6 +228,9 @@ static void virtio_pci_start_ioeventfd(VirtIOPCIProxy
*proxy)
assign_error:
while (--n >= 0) {
+ if (!virtio_queue_valid(proxy->vdev, n)) {
+ continue;
+ }
if (!virtio_queue_get_num(proxy->vdev, n)) {
continue;
}
@@ -246,6 +252,9 @@ static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy)
}
for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
+ if (!virtio_queue_valid(proxy->vdev, n)) {
+ continue;
+ }
if (!virtio_queue_get_num(proxy->vdev, n)) {
continue;
}
@@ -546,6 +555,9 @@ static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy,
int nvqs)
MSIMessage msg;
for (queue_no = 0; queue_no < nvqs; queue_no++) {
+ if (!virtio_queue_valid(vdev, queue_no)) {
+ continue;
+ }
if (!virtio_queue_get_num(vdev, queue_no)) {
break;
}
@@ -593,6 +605,9 @@ static void kvm_virtio_pci_vector_release(VirtIOPCIProxy
*proxy, int nvqs)
int queue_no;
for (queue_no = 0; queue_no < nvqs; queue_no++) {
+ if (!virtio_queue_valid(vdev, queue_no)) {
+ continue;
+ }
if (!virtio_queue_get_num(vdev, queue_no)) {
break;
}
@@ -665,6 +680,9 @@ static int kvm_virtio_pci_vector_unmask(PCIDevice *dev,
unsigned vector,
int ret, queue_no;
for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
+ if (!virtio_queue_valid(vdev, queue_no)) {
+ continue;
+ }
if (!virtio_queue_get_num(vdev, queue_no)) {
break;
}
@@ -695,6 +713,9 @@ static void kvm_virtio_pci_vector_mask(PCIDevice *dev,
unsigned vector)
int queue_no;
for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
+ if (!virtio_queue_valid(vdev, queue_no)) {
+ continue;
+ }
if (!virtio_queue_get_num(vdev, queue_no)) {
break;
}
@@ -717,6 +738,9 @@ static void kvm_virtio_pci_vector_poll(PCIDevice *dev,
VirtQueue *vq;
for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
+ if (!virtio_queue_valid(vdev, queue_no)) {
+ continue;
+ }
if (!virtio_queue_get_num(vdev, queue_no)) {
break;
}
@@ -790,6 +814,9 @@ static int virtio_pci_set_guest_notifiers(DeviceState *d,
int nvqs, bool assign)
}
for (n = 0; n < nvqs; n++) {
+ if (!virtio_queue_valid(vdev, n)) {
+ continue;
+ }
if (!virtio_queue_get_num(vdev, n)) {
break;
}
--
1.7.2.5