[Qemu-devel] [PULL 68/69] libqos: Solve bug in interrupt checking when using MSIX in virtio-pci.c

[Stefan Hajnoczi]

From: Marc Marí <address@hidden>

The MSIX interrupt was always acked without checking its value, which caused a
race condition. If the ISR was raised between the read and the acking, the ISR
was never detected and it timed out.

Signed-off-by: Marc Marí <address@hidden>
Reviewed-by: John Snow <address@hidden>
Tested-by: John Snow <address@hidden>
Message-id: address@hidden
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
 tests/libqos/virtio-pci.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/tests/libqos/virtio-pci.c b/tests/libqos/virtio-pci.c
index 046a316..f9fb924 100644
--- a/tests/libqos/virtio-pci.c
+++ b/tests/libqos/virtio-pci.c
@@ -142,8 +142,12 @@ static bool qvirtio_pci_get_queue_isr_status(QVirtioDevice 
*d, QVirtQueue *vq)
             return qpci_msix_pending(dev->pdev, vqpci->msix_entry);
         } else {
             data = readl(vqpci->msix_addr);
-            writel(vqpci->msix_addr, 0);
-            return data == vqpci->msix_data;
+            if (data == vqpci->msix_data) {
+                writel(vqpci->msix_addr, 0);
+                return true;
+            } else {
+                return false;
+            }
         }
     } else {
         return qpci_io_readb(dev->pdev, dev->addr + QVIRTIO_PCI_ISR_STATUS) & 
1;
@@ -162,8 +166,12 @@ static bool 
qvirtio_pci_get_config_isr_status(QVirtioDevice *d)
             return qpci_msix_pending(dev->pdev, dev->config_msix_entry);
         } else {
             data = readl(dev->config_msix_addr);
-            writel(dev->config_msix_addr, 0);
-            return data == dev->config_msix_data;
+            if (data == dev->config_msix_data) {
+                writel(dev->config_msix_addr, 0);
+                return true;
+            } else {
+                return false;
+            }
         }
     } else {
         return qpci_io_readb(dev->pdev, dev->addr + QVIRTIO_PCI_ISR_STATUS) & 
2;
-- 
2.1.0