[PATCH 4/4] tests/qtest: Enable spapr dma with linear iommu map

[Nicholas Piggin <npiggin@gmail.com>]

qtests spapr dma was broken because the iommu was not set up.

spapr requires hypercalls to set up the iommu (TCE tables), but
there is no support for that or a side-channel to the iommu in
qtests at the moment, so add a quick workaround in QEMU to have
the spapr iommu provide a linear map to memory when running
qtests.

The buggy msix checks can all be removed since the tests all work
now.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 tests/qtest/libqos/pci.h             |  4 ----
 hw/ppc/spapr_iommu.c                 |  9 ++++++++-
 tests/qtest/e1000e-test.c            | 21 ---------------------
 tests/qtest/igb-test.c               | 21 ---------------------
 tests/qtest/libqos/generic-pcihost.c |  1 -
 tests/qtest/libqos/pci-pc.c          |  3 ---
 tests/qtest/libqos/pci-spapr.c       |  7 ++++---
 tests/qtest/libqos/pci.c             | 14 --------------
 tests/qtest/vhost-user-blk-test.c    |  6 ------
 tests/qtest/virtio-blk-test.c        | 12 ------------
 10 files changed, 12 insertions(+), 86 deletions(-)

diff --git a/tests/qtest/libqos/pci.h b/tests/qtest/libqos/pci.h
index 9f8f154c301..ef40a6917d3 100644
--- a/tests/qtest/libqos/pci.h
+++ b/tests/qtest/libqos/pci.h
@@ -51,7 +51,6 @@ struct QPCIBus {
     QTestState *qts;
     uint64_t pio_alloc_ptr, pio_limit;
     uint64_t mmio_alloc_ptr, mmio_limit;
-    bool has_buggy_msi; /* TRUE for spapr, FALSE for pci */
     bool not_hotpluggable; /* TRUE if devices cannot be hotplugged */
 
 };
@@ -83,9 +82,6 @@ QPCIDevice *qpci_device_find(QPCIBus *bus, int devfn);
 void qpci_device_init(QPCIDevice *dev, QPCIBus *bus, QPCIAddress *addr);
 int qpci_secondary_buses_init(QPCIBus *bus);
 
-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, uint8_t start_addr);
 void qpci_msix_enable(QPCIDevice *dev);
diff --git a/hw/ppc/spapr_iommu.c b/hw/ppc/spapr_iommu.c
index db3a14c1dfd..77895c597df 100644
--- a/hw/ppc/spapr_iommu.c
+++ b/hw/ppc/spapr_iommu.c
@@ -22,6 +22,7 @@
 #include "qemu/log.h"
 #include "qemu/module.h"
 #include "system/kvm.h"
+#include "system/qtest.h"
 #include "kvm_ppc.h"
 #include "migration/vmstate.h"
 #include "system/dma.h"
@@ -125,7 +126,13 @@ static IOMMUTLBEntry spapr_tce_translate_iommu(IOMMUMemoryRegion *iommu,
         .perm = IOMMU_NONE,
     };
 
-    if ((addr >> tcet->page_shift) < tcet->nb_table) {
+    if (qtest_enabled()) {
+        /* spapr qtests does not set up the IOMMU, shortcut a linear map */
+        ret.iova = addr & TARGET_PAGE_MASK;
+        ret.translated_addr = addr & TARGET_PAGE_MASK;
+        ret.addr_mask = ~TARGET_PAGE_MASK;
+        ret.perm = IOMMU_RW;
+    } else if ((addr >> tcet->page_shift) < tcet->nb_table) {
         /* Check if we are in bound */
         hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 
diff --git a/tests/qtest/e1000e-test.c b/tests/qtest/e1000e-test.c
index de9738fdb74..8300bf5a5b3 100644
--- a/tests/qtest/e1000e-test.c
+++ b/tests/qtest/e1000e-test.c
@@ -139,13 +139,6 @@ static void test_e1000e_tx(void *obj, void *data, QGuestAllocator * alloc)
 {
     QE1000E_PCI *e1000e = obj;
     QE1000E *d = &e1000e->e1000e;
-    QOSGraphObject *e_object = obj;
-    QPCIDevice *dev = e_object->get_driver(e_object, "pci-device");
-
-    /* FIXME: add spapr support */
-    if (qpci_check_buggy_msi(dev)) {
-        return;
-    }
 
     e1000e_send_verify(d, data, alloc);
 }
@@ -154,13 +147,6 @@ static void test_e1000e_rx(void *obj, void *data, QGuestAllocator * alloc)
 {
     QE1000E_PCI *e1000e = obj;
     QE1000E *d = &e1000e->e1000e;
-    QOSGraphObject *e_object = obj;
-    QPCIDevice *dev = e_object->get_driver(e_object, "pci-device");
-
-    /* FIXME: add spapr support */
-    if (qpci_check_buggy_msi(dev)) {
-        return;
-    }
 
     e1000e_receive_verify(d, data, alloc);
 }
@@ -173,13 +159,6 @@ static void test_e1000e_multiple_transfers(void *obj, void *data,
 
     QE1000E_PCI *e1000e = obj;
     QE1000E *d = &e1000e->e1000e;
-    QOSGraphObject *e_object = obj;
-    QPCIDevice *dev = e_object->get_driver(e_object, "pci-device");
-
-    /* FIXME: add spapr support */
-    if (qpci_check_buggy_msi(dev)) {
-        return;
-    }
 
     for (i = 0; i < iterations; i++) {
         e1000e_send_verify(d, data, alloc);
diff --git a/tests/qtest/igb-test.c b/tests/qtest/igb-test.c
index 3d397ea6973..1b3b5aa6c76 100644
--- a/tests/qtest/igb-test.c
+++ b/tests/qtest/igb-test.c
@@ -142,13 +142,6 @@ static void test_igb_tx(void *obj, void *data, QGuestAllocator * alloc)
 {
     QE1000E_PCI *e1000e = obj;
     QE1000E *d = &e1000e->e1000e;
-    QOSGraphObject *e_object = obj;
-    QPCIDevice *dev = e_object->get_driver(e_object, "pci-device");
-
-    /* FIXME: add spapr support */
-    if (qpci_check_buggy_msi(dev)) {
-        return;
-    }
 
     igb_send_verify(d, data, alloc);
 }
@@ -157,13 +150,6 @@ static void test_igb_rx(void *obj, void *data, QGuestAllocator * alloc)
 {
     QE1000E_PCI *e1000e = obj;
     QE1000E *d = &e1000e->e1000e;
-    QOSGraphObject *e_object = obj;
-    QPCIDevice *dev = e_object->get_driver(e_object, "pci-device");
-
-    /* FIXME: add spapr support */
-    if (qpci_check_buggy_msi(dev)) {
-        return;
-    }
 
     igb_receive_verify(d, data, alloc);
 }
@@ -176,13 +162,6 @@ static void test_igb_multiple_transfers(void *obj, void *data,
 
     QE1000E_PCI *e1000e = obj;
     QE1000E *d = &e1000e->e1000e;
-    QOSGraphObject *e_object = obj;
-    QPCIDevice *dev = e_object->get_driver(e_object, "pci-device");
-
-    /* FIXME: add spapr support */
-    if (qpci_check_buggy_msi(dev)) {
-        return;
-    }
 
     for (i = 0; i < iterations; i++) {
         igb_send_verify(d, data, alloc);
diff --git a/tests/qtest/libqos/generic-pcihost.c b/tests/qtest/libqos/generic-pcihost.c
index 4bbeb5ff508..568897e0ecc 100644
--- a/tests/qtest/libqos/generic-pcihost.c
+++ b/tests/qtest/libqos/generic-pcihost.c
@@ -182,7 +182,6 @@ void qpci_init_generic(QGenericPCIBus *qpci, QTestState *qts,
 
     qpci->gpex_pio_base = 0x3eff0000;
     qpci->bus.not_hotpluggable = !hotpluggable;
-    qpci->bus.has_buggy_msi = false;
 
     qpci->bus.pio_readb = qpci_generic_pio_readb;
     qpci->bus.pio_readw = qpci_generic_pio_readw;
diff --git a/tests/qtest/libqos/pci-pc.c b/tests/qtest/libqos/pci-pc.c
index 147009f4f44..8b79d858bd5 100644
--- a/tests/qtest/libqos/pci-pc.c
+++ b/tests/qtest/libqos/pci-pc.c
@@ -124,9 +124,6 @@ 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;
diff --git a/tests/qtest/libqos/pci-spapr.c b/tests/qtest/libqos/pci-spapr.c
index 0f1023e4a73..dfa2087a599 100644
--- a/tests/qtest/libqos/pci-spapr.c
+++ b/tests/qtest/libqos/pci-spapr.c
@@ -20,6 +20,10 @@
  * PCI devices are always little-endian
  * SPAPR by default is big-endian
  * so PCI accessors need to swap data endianness
+ *
+ * The spapr iommu model has a qtest_enabled() check that short-cuts
+ * the TCE table and provides a linear map for DMA, since qtests does
+ * not have a way to make hcalls to set up the TCE table.
  */
 
 static uint8_t qpci_spapr_pio_readb(QPCIBus *bus, uint32_t addr)
@@ -155,9 +159,6 @@ 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;
diff --git a/tests/qtest/libqos/pci.c b/tests/qtest/libqos/pci.c
index 773fd1fb6cf..2bae119bfca 100644
--- a/tests/qtest/libqos/pci.c
+++ b/tests/qtest/libqos/pci.c
@@ -53,20 +53,6 @@ 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);
diff --git a/tests/qtest/vhost-user-blk-test.c b/tests/qtest/vhost-user-blk-test.c
index ea90d41232e..3e71fdb9d78 100644
--- a/tests/qtest/vhost-user-blk-test.c
+++ b/tests/qtest/vhost-user-blk-test.c
@@ -554,14 +554,8 @@ static void idx(void *obj, void *u_data, QGuestAllocator *t_alloc)
     uint32_t desc_idx;
     uint8_t status;
     char *data;
-    QOSGraphObject *blk_object = obj;
-    QPCIDevice *pci_dev = blk_object->get_driver(blk_object, "pci-device");
     QTestState *qts = global_qtest;
 
-    if (qpci_check_buggy_msi(pci_dev)) {
-        return;
-    }
-
     qpci_msix_enable(pdev->pdev);
     qvirtio_pci_set_msix_configuration_vector(pdev, t_alloc, 0);
 
diff --git a/tests/qtest/virtio-blk-test.c b/tests/qtest/virtio-blk-test.c
index 98c906ebb4a..3a005d600c1 100644
--- a/tests/qtest/virtio-blk-test.c
+++ b/tests/qtest/virtio-blk-test.c
@@ -474,14 +474,8 @@ static void msix(void *obj, void *u_data, QGuestAllocator *t_alloc)
     uint32_t free_head;
     uint8_t status;
     char *data;
-    QOSGraphObject *blk_object = obj;
-    QPCIDevice *pci_dev = blk_object->get_driver(blk_object, "pci-device");
     QTestState *qts = global_qtest;
 
-    if (qpci_check_buggy_msi(pci_dev)) {
-        return;
-    }
-
     qpci_msix_enable(pdev->pdev);
     qvirtio_pci_set_msix_configuration_vector(pdev, t_alloc, 0);
 
@@ -584,14 +578,8 @@ static void idx(void *obj, void *u_data, QGuestAllocator *t_alloc)
     uint32_t desc_idx;
     uint8_t status;
     char *data;
-    QOSGraphObject *blk_object = obj;
-    QPCIDevice *pci_dev = blk_object->get_driver(blk_object, "pci-device");
     QTestState *qts = global_qtest;
 
-    if (qpci_check_buggy_msi(pci_dev)) {
-        return;
-    }
-
     qpci_msix_enable(pdev->pdev);
     qvirtio_pci_set_msix_configuration_vector(pdev, t_alloc, 0);
 
-- 
2.47.1