tests/libqos: has_buggy_msi flag

The Qgraph framework makes any test using
pci bus run the same function using pci-pci and
pci-spapr bus. However, some tests are not ready to use
the spapr bus, due to a MSI bug. Until it does not get
fixed, this flag allows them to skip the test

Signed-off-by: Emanuele Giuseppe Esposito <e.emanuelegiuseppe@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tests/libqos/pci-pc.c

@@ -124,6 +124,9 @@ void qpci_init_pc(QPCIBusPC *qpci, QTestState *qts, QGuestAllocator *alloc)
 {
     assert(qts);
 
+    /* tests can use pci-bus */
+    qpci->bus.has_buggy_msi = FALSE;
+
     qpci->bus.pio_readb = qpci_pc_pio_readb;
     qpci->bus.pio_readw = qpci_pc_pio_readw;
     qpci->bus.pio_readl = qpci_pc_pio_readl;

tests/libqos/pci-spapr.c

@@ -155,6 +155,9 @@ void qpci_init_spapr(QPCIBusSPAPR *qpci, QTestState *qts,
 {
     assert(qts);
 
+    /* tests cannot use spapr, needs to be fixed first */
+    qpci->bus.has_buggy_msi = TRUE;
+
     qpci->alloc = alloc;
 
     qpci->bus.pio_readb = qpci_spapr_pio_readb;

tests/libqos/pci.c

@@ -51,6 +51,20 @@ void qpci_device_foreach(QPCIBus *bus, int vendor_id, int device_id,
     }
 }
 
+bool qpci_has_buggy_msi(QPCIDevice *dev)
+{
+    return dev->bus->has_buggy_msi;
+}
+
+bool qpci_check_buggy_msi(QPCIDevice *dev)
+{
+    if (qpci_has_buggy_msi(dev)) {
+        g_test_skip("Skipping due to incomplete support for MSI");
+        return true;
+    }
+    return false;
+}
+
 static void qpci_device_set(QPCIDevice *dev, QPCIBus *bus, int devfn)
 {
     g_assert(dev);

tests/libqos/pci.h

@@ -53,6 +53,7 @@ struct QPCIBus {
     QTestState *qts;
     uint16_t pio_alloc_ptr;
     uint64_t mmio_alloc_ptr, mmio_limit;
+    bool has_buggy_msi; /* TRUE for spapr, FALSE for pci */
 
 };
 
@@ -81,6 +82,9 @@ void qpci_device_foreach(QPCIBus *bus, int vendor_id, int device_id,
 QPCIDevice *qpci_device_find(QPCIBus *bus, int devfn);
 void qpci_device_init(QPCIDevice *dev, QPCIBus *bus, QPCIAddress *addr);
 
+bool qpci_has_buggy_msi(QPCIDevice *dev);
+bool qpci_check_buggy_msi(QPCIDevice *dev);
+
 void qpci_device_enable(QPCIDevice *dev);
 uint8_t qpci_find_capability(QPCIDevice *dev, uint8_t id);
 void qpci_msix_enable(QPCIDevice *dev);