[Qemu-devel] [PATCH] pci: Don't deliver MSI/MSI-X messages if bus master support is off

[Jan Kiszka <jan.kiszka@web.de>]

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From: Jan Kiszka <jan.kiszka@siemens.com>

The spec says (and real HW confirms this) that, if the bus master bit
is 0, the device will not generate any PCI accesses. MSI and MSI-X
messages fall among these.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 hw/pci/msi.c  | 4 ++++
 hw/pci/msix.c | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/hw/pci/msi.c b/hw/pci/msi.c
index a4a3040..36b651b 100644
--- a/hw/pci/msi.c
+++ b/hw/pci/msi.c
@@ -285,6 +285,10 @@ void msi_notify(PCIDevice *dev, unsigned int vector)
         return;
     }
 
+    if (!(pci_get_word(dev->config + PCI_COMMAND) & PCI_COMMAND_MASTER)) {
+        return;
+    }
+
     msg = msi_get_message(dev, vector);
 
     MSI_DEV_PRINTF(dev,
diff --git a/hw/pci/msix.c b/hw/pci/msix.c
index 5c49bfc..c77ae7d 100644
--- a/hw/pci/msix.c
+++ b/hw/pci/msix.c
@@ -437,6 +437,10 @@ void msix_notify(PCIDevice *dev, unsigned vector)
         return;
     }
 
+    if (!(pci_get_word(dev->config + PCI_COMMAND) & PCI_COMMAND_MASTER)) {
+        return;
+    }
+
     msg = msix_get_message(dev, vector);
 
     stl_le_phys(&address_space_memory, msg.address, msg.data);
-- 
1.8.1.1.298.ge7eed54


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