diff --git a/tests/virtio-9p-test.c b/tests/virtio-9p-test.c
index 2341622..4d243b4 100644
--- a/tests/virtio-9p-test.c
+++ b/tests/virtio-9p-test.c
@@ -10,62 +10,56 @@
 #include "qemu/osdep.h"
 #include "libqtest.h"
 #include "qemu-common.h"
-#include "libqos/pci-pc.h"
+#include "libqos/libqos-pc.h"
 #include "libqos/virtio.h"
 #include "libqos/virtio-pci.h"
-#include "libqos/malloc.h"
-#include "libqos/malloc-pc.h"
 #include "standard-headers/linux/virtio_ids.h"
 #include "standard-headers/linux/virtio_pci.h"
 
 static const char mount_tag[] = "qtest";
 static char *test_share;
 
-static void qvirtio_9p_start(void)
-{
-    char *args;
 
+static QOSState *qvirtio_9p_start(void)
+{
     test_share = g_strdup("/tmp/qtest.XXXXXX");
     g_assert_nonnull(mkdtemp(test_share));
+    const char *cmd = "-fsdev local,id=fsdev0,security_model=none,path=%s "
+                      "-device virtio-9p-pci,fsdev=fsdev0,mount_tag=%s";
 
-    args = g_strdup_printf("-fsdev local,id=fsdev0,security_model=none,path=%s "
-                           "-device virtio-9p-pci,fsdev=fsdev0,mount_tag=%s",
-                           test_share, mount_tag);
-
-    qtest_start(args);
-    g_free(args);
+    return qtest_pc_boot(cmd, test_share, mount_tag);
 }
 
-static void qvirtio_9p_stop(void)
+static void qvirtio_9p_stop(QOSState *qs)
 {
-    qtest_end();
+    qtest_shutdown(qs);
     rmdir(test_share);
     g_free(test_share);
 }
 
 static void pci_nop(void)
 {
-    qvirtio_9p_start();
-    qvirtio_9p_stop();
+    QOSState *qs;
+
+    qs = qvirtio_9p_start();
+    qvirtio_9p_stop(qs);
 }
 
 typedef struct {
     QVirtioDevice *dev;
-    QGuestAllocator *alloc;
-    QPCIBus *bus;
+    QOSState *qs;
     QVirtQueue *vq;
 } QVirtIO9P;
 
-static QVirtIO9P *qvirtio_9p_pci_init(void)
+static QVirtIO9P *qvirtio_9p_pci_init(QOSState *qs)
 {
     QVirtIO9P *v9p;
     QVirtioPCIDevice *dev;
 
     v9p = g_new0(QVirtIO9P, 1);
-    v9p->alloc = pc_alloc_init();
-    v9p->bus = qpci_init_pc(NULL);
 
-    dev = qvirtio_pci_device_find(v9p->bus, VIRTIO_ID_9P);
+    v9p->qs = qs;
+    dev = qvirtio_pci_device_find(v9p->qs->pcibus, VIRTIO_ID_9P);
     g_assert_nonnull(dev);
     g_assert_cmphex(dev->vdev.device_type, ==, VIRTIO_ID_9P);
     v9p->dev = (QVirtioDevice *) dev;
@@ -75,17 +69,15 @@ static QVirtIO9P *qvirtio_9p_pci_init(void)
     qvirtio_set_acknowledge(v9p->dev);
     qvirtio_set_driver(v9p->dev);
 
-    v9p->vq = qvirtqueue_setup(v9p->dev, v9p->alloc, 0);
+    v9p->vq = qvirtqueue_setup(v9p->dev, v9p->qs->alloc, 0);
     return v9p;
 }
 
 static void qvirtio_9p_pci_free(QVirtIO9P *v9p)
 {
-    qvirtqueue_cleanup(v9p->dev->bus, v9p->vq, v9p->alloc);
-    pc_alloc_uninit(v9p->alloc);
+    qvirtqueue_cleanup(v9p->dev->bus, v9p->vq, v9p->qs->alloc);
     qvirtio_pci_device_disable(container_of(v9p->dev, QVirtioPCIDevice, vdev));
     g_free(v9p->dev);
-    qpci_free_pc(v9p->bus);
     g_free(v9p);
 }
 
@@ -96,9 +88,10 @@ static void pci_basic_config(void)
     size_t tag_len;
     char *tag;
     int i;
+    QOSState *qs;
 
-    qvirtio_9p_start();
-    v9p = qvirtio_9p_pci_init();
+    qs = qvirtio_9p_start();
+    v9p = qvirtio_9p_pci_init(qs);
 
     addr = ((QVirtioPCIDevice *) v9p->dev)->addr + VIRTIO_PCI_CONFIG_OFF(false);
     tag_len = qvirtio_config_readw(v9p->dev,
@@ -114,7 +107,7 @@ static void pci_basic_config(void)
     g_free(tag);
 
     qvirtio_9p_pci_free(v9p);
-    qvirtio_9p_stop();
+    qvirtio_9p_stop(qs);
 }
 
 int main(int argc, char **argv)
diff --git a/tests/virtio-blk-test.c b/tests/virtio-blk-test.c
index 79e21c5..2382eb5 100644
--- a/tests/virtio-blk-test.c
+++ b/tests/virtio-blk-test.c
@@ -10,12 +10,10 @@
 
 #include "qemu/osdep.h"
 #include "libqtest.h"
+#include "libqos/libqos-pc.h"
 #include "libqos/virtio.h"
 #include "libqos/virtio-pci.h"
 #include "libqos/virtio-mmio.h"
-#include "libqos/pci-pc.h"
-#include "libqos/malloc.h"
-#include "libqos/malloc-pc.h"
 #include "libqos/malloc-generic.h"
 #include "qemu/bswap.h"
 #include "standard-headers/linux/virtio_ids.h"
@@ -58,24 +56,21 @@ static char *drive_create(void)
     return tmp_path;
 }
 
-static QPCIBus *pci_test_start(void)
+static QOSState *pci_test_start(void)
 {
-    char *cmdline;
+    QOSState *qs;
     char *tmp_path;
+    const char *cmd = "-drive if=none,id=drive0,file=%s,format=raw "
+                      "-drive if=none,id=drive1,file=/dev/null,format=raw "
+                      "-device virtio-blk-pci,id=drv0,drive=drive0,"
+                      "addr=%x.%x";
 
     tmp_path = drive_create();
 
-    cmdline = g_strdup_printf("-drive if=none,id=drive0,file=%s,format=raw "
-                        "-drive if=none,id=drive1,file=/dev/null,format=raw "
-                        "-device virtio-blk-pci,id=drv0,drive=drive0,"
-                        "addr=%x.%x",
-                        tmp_path, PCI_SLOT, PCI_FN);
-    qtest_start(cmdline);
+    qs = qtest_pc_boot(cmd, tmp_path, PCI_SLOT, PCI_FN);
     unlink(tmp_path);
     g_free(tmp_path);
-    g_free(cmdline);
-
-    return qpci_init_pc(NULL);
+    return qs;
 }
 
 static void arm_test_start(void)
@@ -279,37 +274,32 @@ static void test_basic(QVirtioDevice *dev, QGuestAllocator *alloc,
 static void pci_basic(void)
 {
     QVirtioPCIDevice *dev;
-    QPCIBus *bus;
+    QOSState *qs;
     QVirtQueuePCI *vqpci;
-    QGuestAllocator *alloc;
     void *addr;
 
-    bus = pci_test_start();
-    dev = virtio_blk_pci_init(bus, PCI_SLOT);
+    qs = pci_test_start();
+    dev = virtio_blk_pci_init(qs->pcibus, PCI_SLOT);
 
-    alloc = pc_alloc_init();
-    vqpci = (QVirtQueuePCI *)qvirtqueue_setup(&dev->vdev, alloc, 0);
+    vqpci = (QVirtQueuePCI *)qvirtqueue_setup(&dev->vdev, qs->alloc, 0);
 
     /* MSI-X is not enabled */
     addr = dev->addr + VIRTIO_PCI_CONFIG_OFF(false);
 
-    test_basic(&dev->vdev, alloc, &vqpci->vq, (uint64_t)(uintptr_t)addr);
+    test_basic(&dev->vdev, qs->alloc, &vqpci->vq, (uint64_t)(uintptr_t)addr);
 
     /* End test */
-    qvirtqueue_cleanup(dev->vdev.bus, &vqpci->vq, alloc);
-    pc_alloc_uninit(alloc);
+    qvirtqueue_cleanup(dev->vdev.bus, &vqpci->vq, qs->alloc);
     qvirtio_pci_device_disable(dev);
     g_free(dev);
-    qpci_free_pc(bus);
-    test_end();
+    qtest_shutdown(qs);
 }
 
 static void pci_indirect(void)
 {
     QVirtioPCIDevice *dev;
-    QPCIBus *bus;
     QVirtQueuePCI *vqpci;
-    QGuestAllocator *alloc;
+    QOSState *qs;
     QVirtioBlkReq req;
     QVRingIndirectDesc *indirect;
     void *addr;
@@ -320,9 +310,9 @@ static void pci_indirect(void)
     uint8_t status;
     char *data;
 
-    bus = pci_test_start();
+    qs = pci_test_start();
 
-    dev = virtio_blk_pci_init(bus, PCI_SLOT);
+    dev = virtio_blk_pci_init(qs->pcibus, PCI_SLOT);
 
     /* MSI-X is not enabled */
     addr = dev->addr + VIRTIO_PCI_CONFIG_OFF(false);
@@ -337,8 +327,7 @@ static void pci_indirect(void)
                             (1u << VIRTIO_BLK_F_SCSI));
     qvirtio_set_features(&dev->vdev, features);
 
-    alloc = pc_alloc_init();
-    vqpci = (QVirtQueuePCI *)qvirtqueue_setup(&dev->vdev, alloc, 0);
+    vqpci = (QVirtQueuePCI *)qvirtqueue_setup(&dev->vdev, qs->alloc, 0);
     qvirtio_set_driver_ok(&dev->vdev);
 
     /* Write request */
@@ -348,11 +337,11 @@ static void pci_indirect(void)
     req.data = g_malloc0(512);
     strcpy(req.data, "TEST");
 
-    req_addr = virtio_blk_request(alloc, &dev->vdev, &req, 512);
+    req_addr = virtio_blk_request(qs->alloc, &dev->vdev, &req, 512);
 
     g_free(req.data);
 
-    indirect = qvring_indirect_desc_setup(&dev->vdev, alloc, 2);
+    indirect = qvring_indirect_desc_setup(&dev->vdev, qs->alloc, 2);
     qvring_indirect_desc_add(indirect, req_addr, 528, false);
     qvring_indirect_desc_add(indirect, req_addr + 528, 1, true);
     free_head = qvirtqueue_add_indirect(&vqpci->vq, indirect);
@@ -364,7 +353,7 @@ static void pci_indirect(void)
     g_assert_cmpint(status, ==, 0);
 
     g_free(indirect);
-    guest_free(alloc, req_addr);
+    guest_free(qs->alloc, req_addr);
 
     /* Read request */
     req.type = VIRTIO_BLK_T_IN;
@@ -373,11 +362,11 @@ static void pci_indirect(void)
     req.data = g_malloc0(512);
     strcpy(req.data, "TEST");
 
-    req_addr = virtio_blk_request(alloc, &dev->vdev, &req, 512);
+    req_addr = virtio_blk_request(qs->alloc, &dev->vdev, &req, 512);
 
     g_free(req.data);
 
-    indirect = qvring_indirect_desc_setup(&dev->vdev, alloc, 2);
+    indirect = qvring_indirect_desc_setup(&dev->vdev, qs->alloc, 2);
     qvring_indirect_desc_add(indirect, req_addr, 16, false);
     qvring_indirect_desc_add(indirect, req_addr + 16, 513, true);
     free_head = qvirtqueue_add_indirect(&vqpci->vq, indirect);
@@ -394,28 +383,26 @@ static void pci_indirect(void)
     g_free(data);
 
     g_free(indirect);
-    guest_free(alloc, req_addr);
+    guest_free(qs->alloc, req_addr);
 
     /* End test */
-    qvirtqueue_cleanup(dev->vdev.bus, &vqpci->vq, alloc);
-    pc_alloc_uninit(alloc);
+    qvirtqueue_cleanup(dev->vdev.bus, &vqpci->vq, qs->alloc);
     qvirtio_pci_device_disable(dev);
     g_free(dev);
-    qpci_free_pc(bus);
-    test_end();
+    qtest_shutdown(qs);
 }
 
 static void pci_config(void)
 {
     QVirtioPCIDevice *dev;
-    QPCIBus *bus;
+    QOSState *qs;
     int n_size = TEST_IMAGE_SIZE / 2;
     void *addr;
     uint64_t capacity;
 
-    bus = pci_test_start();
+    qs = pci_test_start();
 
-    dev = virtio_blk_pci_init(bus, PCI_SLOT);
+    dev = virtio_blk_pci_init(qs->pcibus, PCI_SLOT);
 
     /* MSI-X is not enabled */
     addr = dev->addr + VIRTIO_PCI_CONFIG_OFF(false);
@@ -434,16 +421,15 @@ static void pci_config(void)
 
     qvirtio_pci_device_disable(dev);
     g_free(dev);
-    qpci_free_pc(bus);
-    test_end();
+
+    qtest_shutdown(qs);
 }
 
 static void pci_msix(void)
 {
     QVirtioPCIDevice *dev;
-    QPCIBus *bus;
+    QOSState *qs;
     QVirtQueuePCI *vqpci;
-    QGuestAllocator *alloc;
     QVirtioBlkReq req;
     int n_size = TEST_IMAGE_SIZE / 2;
     void *addr;
@@ -454,13 +440,12 @@ static void pci_msix(void)
     uint8_t status;
     char *data;
 
-    bus = pci_test_start();
-    alloc = pc_alloc_init();
+    qs = pci_test_start();
 
-    dev = virtio_blk_pci_init(bus, PCI_SLOT);
+    dev = virtio_blk_pci_init(qs->pcibus, PCI_SLOT);
     qpci_msix_enable(dev->pdev);
 
-    qvirtio_pci_set_msix_configuration_vector(dev, alloc, 0);
+    qvirtio_pci_set_msix_configuration_vector(dev, qs->alloc, 0);
 
     /* MSI-X is enabled */
     addr = dev->addr + VIRTIO_PCI_CONFIG_OFF(true);
@@ -475,8 +460,8 @@ static void pci_msix(void)
                             (1u << VIRTIO_BLK_F_SCSI));
     qvirtio_set_features(&dev->vdev, features);
 
-    vqpci = (QVirtQueuePCI *)qvirtqueue_setup(&dev->vdev, alloc, 0);
-    qvirtqueue_pci_msix_setup(dev, vqpci, alloc, 1);
+    vqpci = (QVirtQueuePCI *)qvirtqueue_setup(&dev->vdev, qs->alloc, 0);
+    qvirtqueue_pci_msix_setup(dev, vqpci, qs->alloc, 1);
 
     qvirtio_set_driver_ok(&dev->vdev);
 
@@ -495,7 +480,7 @@ static void pci_msix(void)
     req.data = g_malloc0(512);
     strcpy(req.data, "TEST");
 
-    req_addr = virtio_blk_request(alloc, &dev->vdev, &req, 512);
+    req_addr = virtio_blk_request(qs->alloc, &dev->vdev, &req, 512);
 
     g_free(req.data);
 
@@ -510,7 +495,7 @@ static void pci_msix(void)
     status = readb(req_addr + 528);
     g_assert_cmpint(status, ==, 0);
 
-    guest_free(alloc, req_addr);
+    guest_free(qs->alloc, req_addr);
 
     /* Read request */
     req.type = VIRTIO_BLK_T_IN;
@@ -518,7 +503,7 @@ static void pci_msix(void)
     req.sector = 0;
     req.data = g_malloc0(512);
 
-    req_addr = virtio_blk_request(alloc, &dev->vdev, &req, 512);
+    req_addr = virtio_blk_request(qs->alloc, &dev->vdev, &req, 512);
 
     g_free(req.data);
 
@@ -540,24 +525,21 @@ static void pci_msix(void)
     g_assert_cmpstr(data, ==, "TEST");
     g_free(data);
 
-    guest_free(alloc, req_addr);
+    guest_free(qs->alloc, req_addr);
 
     /* End test */
-    qvirtqueue_cleanup(dev->vdev.bus, &vqpci->vq, alloc);
-    pc_alloc_uninit(alloc);
+    qvirtqueue_cleanup(dev->vdev.bus, &vqpci->vq, qs->alloc);
     qpci_msix_disable(dev->pdev);
     qvirtio_pci_device_disable(dev);
     g_free(dev);
-    qpci_free_pc(bus);
-    test_end();
+    qtest_shutdown(qs);
 }
 
 static void pci_idx(void)
 {
     QVirtioPCIDevice *dev;
-    QPCIBus *bus;
+    QOSState *qs;
     QVirtQueuePCI *vqpci;
-    QGuestAllocator *alloc;
     QVirtioBlkReq req;
     void *addr;
     uint64_t req_addr;
@@ -567,13 +549,12 @@ static void pci_idx(void)
     uint8_t status;
     char *data;
 
-    bus = pci_test_start();
-    alloc = pc_alloc_init();
+    qs = pci_test_start();
 
-    dev = virtio_blk_pci_init(bus, PCI_SLOT);
+    dev = virtio_blk_pci_init(qs->pcibus, PCI_SLOT);
     qpci_msix_enable(dev->pdev);
 
-    qvirtio_pci_set_msix_configuration_vector(dev, alloc, 0);
+    qvirtio_pci_set_msix_configuration_vector(dev, qs->alloc, 0);
 
     /* MSI-X is enabled */
     addr = dev->addr + VIRTIO_PCI_CONFIG_OFF(true);
@@ -588,8 +569,8 @@ static void pci_idx(void)
                             (1u << VIRTIO_BLK_F_SCSI));
     qvirtio_set_features(&dev->vdev, features);
 
-    vqpci = (QVirtQueuePCI *)qvirtqueue_setup(&dev->vdev, alloc, 0);
-    qvirtqueue_pci_msix_setup(dev, vqpci, alloc, 1);
+    vqpci = (QVirtQueuePCI *)qvirtqueue_setup(&dev->vdev, qs->alloc, 0);
+    qvirtqueue_pci_msix_setup(dev, vqpci, qs->alloc, 1);
 
     qvirtio_set_driver_ok(&dev->vdev);
 
@@ -600,7 +581,7 @@ static void pci_idx(void)
     req.data = g_malloc0(512);
     strcpy(req.data, "TEST");
 
-    req_addr = virtio_blk_request(alloc, &dev->vdev, &req, 512);
+    req_addr = virtio_blk_request(qs->alloc, &dev->vdev, &req, 512);
 
     g_free(req.data);
 
@@ -618,7 +599,7 @@ static void pci_idx(void)
     req.data = g_malloc0(512);
     strcpy(req.data, "TEST");
 
-    req_addr = virtio_blk_request(alloc, &dev->vdev, &req, 512);
+    req_addr = virtio_blk_request(qs->alloc, &dev->vdev, &req, 512);
 
     g_free(req.data);
 
@@ -635,7 +616,7 @@ static void pci_idx(void)
                                              QVIRTIO_BLK_TIMEOUT_US);
     g_assert_cmpint(status, ==, 0);
 
-    guest_free(alloc, req_addr);
+    guest_free(qs->alloc, req_addr);
 
     /* Read request */
     req.type = VIRTIO_BLK_T_IN;
@@ -643,7 +624,7 @@ static void pci_idx(void)
     req.sector = 1;
     req.data = g_malloc0(512);
 
-    req_addr = virtio_blk_request(alloc, &dev->vdev, &req, 512);
+    req_addr = virtio_blk_request(qs->alloc, &dev->vdev, &req, 512);
 
     g_free(req.data);
 
@@ -664,38 +645,35 @@ static void pci_idx(void)
     g_assert_cmpstr(data, ==, "TEST");
     g_free(data);
 
-    guest_free(alloc, req_addr);
+    guest_free(qs->alloc, req_addr);
 
     /* End test */
-    qvirtqueue_cleanup(dev->vdev.bus, &vqpci->vq, alloc);
-    pc_alloc_uninit(alloc);
+    qvirtqueue_cleanup(dev->vdev.bus, &vqpci->vq, qs->alloc);
     qpci_msix_disable(dev->pdev);
     qvirtio_pci_device_disable(dev);
     g_free(dev);
-    qpci_free_pc(bus);
-    test_end();
+    qtest_shutdown(qs);
 }
 
 static void pci_hotplug(void)
 {
-    QPCIBus *bus;
     QVirtioPCIDevice *dev;
+    QOSState *qs;
 
-    bus = pci_test_start();
+    qs = pci_test_start();
 
     /* plug secondary disk */
     qpci_plug_device_test("virtio-blk-pci", "drv1", PCI_SLOT_HP,
                           "'drive': 'drive1'");
 
-    dev = virtio_blk_pci_init(bus, PCI_SLOT_HP);
+    dev = virtio_blk_pci_init(qs->pcibus, PCI_SLOT_HP);
     g_assert(dev);
     qvirtio_pci_device_disable(dev);
     g_free(dev);
 
     /* unplug secondary disk */
     qpci_unplug_acpi_device_test("drv1", PCI_SLOT_HP);
-    qpci_free_pc(bus);
-    test_end();
+    qtest_shutdown(qs);
 }
 
 static void mmio_basic(void)
@@ -731,8 +709,8 @@ static void mmio_basic(void)
 
     /* End test */
     qvirtqueue_cleanup(dev->vdev.bus, vq, alloc);
-    generic_alloc_uninit(alloc);
     g_free(dev);
+    generic_alloc_uninit(alloc);
     test_end();
 }
 
diff --git a/tests/virtio-net-test.c b/tests/virtio-net-test.c
index 6fa385e..6bec784 100644
--- a/tests/virtio-net-test.c
+++ b/tests/virtio-net-test.c
@@ -12,12 +12,9 @@
 #include "qemu-common.h"
 #include "qemu/sockets.h"
 #include "qemu/iov.h"
-#include "libqos/pci-pc.h"
+#include "libqos/libqos-pc.h"
 #include "libqos/virtio.h"
 #include "libqos/virtio-pci.h"
-#include "libqos/malloc.h"
-#include "libqos/malloc-pc.h"
-#include "libqos/malloc-generic.h"
 #include "qemu/bswap.h"
 #include "hw/virtio/virtio-net.h"
 #include "standard-headers/linux/virtio_ids.h"
@@ -53,16 +50,12 @@ static QVirtioPCIDevice *virtio_net_pci_init(QPCIBus *bus, int slot)
     return dev;
 }
 
-static QPCIBus *pci_test_start(int socket)
+static QOSState *pci_test_start(int socket)
 {
-    char *cmdline;
+    const char *cmd = "-netdev socket,fd=%d,id=hs0 -device "
+                      "virtio-net-pci,netdev=hs0";
 
-    cmdline = g_strdup_printf("-netdev socket,fd=%d,id=hs0 -device "
-                              "virtio-net-pci,netdev=hs0", socket);
-    qtest_start(cmdline);
-    g_free(cmdline);
-
-    return qpci_init_pc(NULL);
+    return qtest_pc_boot(cmd, socket);
 }
 
 static void driver_init(QVirtioDevice *dev)
@@ -205,9 +198,8 @@ static void stop_cont_test(QVirtioDevice *dev,
 static void pci_basic(gconstpointer data)
 {
     QVirtioPCIDevice *dev;
-    QPCIBus *bus;
+    QOSState *qs;
     QVirtQueuePCI *tx, *rx;
-    QGuestAllocator *alloc;
     void (*func) (QVirtioDevice *dev,
                   QGuestAllocator *alloc,
                   QVirtQueue *rvq,
@@ -218,26 +210,23 @@ static void pci_basic(gconstpointer data)
     ret = socketpair(PF_UNIX, SOCK_STREAM, 0, sv);
     g_assert_cmpint(ret, !=, -1);
 
-    bus = pci_test_start(sv[1]);
-    dev = virtio_net_pci_init(bus, PCI_SLOT);
+    qs = pci_test_start(sv[1]);
+    dev = virtio_net_pci_init(qs->pcibus, PCI_SLOT);
 
-    alloc = pc_alloc_init();
-    rx = (QVirtQueuePCI *)qvirtqueue_setup(&dev->vdev, alloc, 0);
-    tx = (QVirtQueuePCI *)qvirtqueue_setup(&dev->vdev, alloc, 1);
+    rx = (QVirtQueuePCI *)qvirtqueue_setup(&dev->vdev, qs->alloc, 0);
+    tx = (QVirtQueuePCI *)qvirtqueue_setup(&dev->vdev, qs->alloc, 1);
 
     driver_init(&dev->vdev);
-    func(&dev->vdev, alloc, &rx->vq, &tx->vq, sv[0]);
+    func(&dev->vdev, qs->alloc, &rx->vq, &tx->vq, sv[0]);
 
     /* End test */
     close(sv[0]);
-    qvirtqueue_cleanup(dev->vdev.bus, &tx->vq, alloc);
-    qvirtqueue_cleanup(dev->vdev.bus, &rx->vq, alloc);
-    pc_alloc_uninit(alloc);
+    qvirtqueue_cleanup(dev->vdev.bus, &tx->vq, qs->alloc);
+    qvirtqueue_cleanup(dev->vdev.bus, &rx->vq, qs->alloc);
     qvirtio_pci_device_disable(dev);
     g_free(dev->pdev);
     g_free(dev);
-    qpci_free_pc(bus);
-    test_end();
+    qtest_shutdown(qs);
 }
 #endif
 
diff --git a/tests/virtio-scsi-test.c b/tests/virtio-scsi-test.c
index 3dbec2f..7d697ab 100644
--- a/tests/virtio-scsi-test.c
+++ b/tests/virtio-scsi-test.c
@@ -11,12 +11,9 @@
 #include "qemu/osdep.h"
 #include "libqtest.h"
 #include "block/scsi.h"
+#include "libqos/libqos-pc.h"
 #include "libqos/virtio.h"
 #include "libqos/virtio-pci.h"
-#include "libqos/pci-pc.h"
-#include "libqos/malloc.h"
-#include "libqos/malloc-pc.h"
-#include "libqos/malloc-generic.h"
 #include "standard-headers/linux/virtio_ids.h"
 #include "standard-headers/linux/virtio_pci.h"
 #include "standard-headers/linux/virtio_scsi.h"
@@ -29,28 +26,23 @@
 
 typedef struct {
     QVirtioDevice *dev;
-    QGuestAllocator *alloc;
-    QPCIBus *bus;
+    QOSState *qs;
     int num_queues;
     QVirtQueue *vq[MAX_NUM_QUEUES + 2];
 } QVirtIOSCSI;
 
-static void qvirtio_scsi_start(const char *extra_opts)
+static QOSState *qvirtio_scsi_start(const char *extra_opts)
 {
-    char *cmdline;
-
-    cmdline = g_strdup_printf(
-                "-drive id=drv0,if=none,file=/dev/null,format=raw "
-                "-device virtio-scsi-pci,id=vs0 "
-                "-device scsi-hd,bus=vs0.0,drive=drv0 %s",
-                extra_opts ? : "");
-    qtest_start(cmdline);
-    g_free(cmdline);
+    const char *cmd = "-drive id=drv0,if=none,file=/dev/null,format=raw "
+                      "-device virtio-scsi-pci,id=vs0 "
+                      "-device scsi-hd,bus=vs0.0,drive=drv0 %s";
+
+    return qtest_pc_boot(cmd, extra_opts ? : "");
 }
 
-static void qvirtio_scsi_stop(void)
+static void qvirtio_scsi_stop(QOSState *qs)
 {
-    qtest_end();
+    qtest_shutdown(qs);
 }
 
 static void qvirtio_scsi_pci_free(QVirtIOSCSI *vs)
@@ -58,12 +50,11 @@ static void qvirtio_scsi_pci_free(QVirtIOSCSI *vs)
     int i;
 
     for (i = 0; i < vs->num_queues + 2; i++) {
-        qvirtqueue_cleanup(vs->dev->bus, vs->vq[i], vs->alloc);
+        qvirtqueue_cleanup(vs->dev->bus, vs->vq[i], vs->qs->alloc);
     }
-    pc_alloc_uninit(vs->alloc);
     qvirtio_pci_device_disable(container_of(vs->dev, QVirtioPCIDevice, vdev));
     g_free(vs->dev);
-    qpci_free_pc(vs->bus);
+    qvirtio_scsi_stop(vs->qs);
     g_free(vs);
 }
 
@@ -72,7 +63,7 @@ static uint64_t qvirtio_scsi_alloc(QVirtIOSCSI *vs, size_t alloc_size,
 {
     uint64_t addr;
 
-    addr = guest_alloc(vs->alloc, alloc_size);
+    addr = guest_alloc(vs->qs->alloc, alloc_size);
     if (data) {
         memwrite(addr, data, alloc_size);
     }
@@ -129,10 +120,10 @@ static uint8_t virtio_scsi_do_command(QVirtIOSCSI *vs, const uint8_t *cdb,
         memread(resp_addr, resp_out, sizeof(*resp_out));
     }
 
-    guest_free(vs->alloc, req_addr);
-    guest_free(vs->alloc, resp_addr);
-    guest_free(vs->alloc, data_in_addr);
-    guest_free(vs->alloc, data_out_addr);
+    guest_free(vs->qs->alloc, req_addr);
+    guest_free(vs->qs->alloc, resp_addr);
+    guest_free(vs->qs->alloc, data_in_addr);
+    guest_free(vs->qs->alloc, data_out_addr);
     return response;
 }
 
@@ -146,10 +137,11 @@ static QVirtIOSCSI *qvirtio_scsi_pci_init(int slot)
     int i;
 
     vs = g_new0(QVirtIOSCSI, 1);
-    vs->alloc = pc_alloc_init();
-    vs->bus = qpci_init_pc(NULL);
 
-    dev = qvirtio_pci_device_find(vs->bus, VIRTIO_ID_SCSI);
+    vs->qs = qvirtio_scsi_start("-drive file=blkdebug::null-co://,"
+                                "if=none,id=dr1,format=raw,file.align=4k "
+                                "-device scsi-disk,drive=dr1,lun=0,scsi-id=1");
+    dev = qvirtio_pci_device_find(vs->qs->pcibus, VIRTIO_ID_SCSI);
     vs->dev = (QVirtioDevice *)dev;
     g_assert(dev != NULL);
     g_assert_cmphex(vs->dev->device_type, ==, VIRTIO_ID_SCSI);
@@ -165,7 +157,7 @@ static QVirtIOSCSI *qvirtio_scsi_pci_init(int slot)
     g_assert_cmpint(vs->num_queues, <, MAX_NUM_QUEUES);
 
     for (i = 0; i < vs->num_queues + 2; i++) {
-        vs->vq[i] = qvirtqueue_setup(vs->dev, vs->alloc, i);
+        vs->vq[i] = qvirtqueue_setup(vs->dev, vs->qs->alloc, i);
     }
 
     /* Clear the POWER ON OCCURRED unit attention */
@@ -184,15 +176,18 @@ static QVirtIOSCSI *qvirtio_scsi_pci_init(int slot)
 /* Tests only initialization so far. TODO: Replace with functional tests */
 static void pci_nop(void)
 {
-    qvirtio_scsi_start(NULL);
-    qvirtio_scsi_stop();
+    QOSState *qs;
+
+    qs = qvirtio_scsi_start(NULL);
+    qvirtio_scsi_stop(qs);
 }
 
 static void hotplug(void)
 {
     QDict *response;
+    QOSState *qs;
 
-    qvirtio_scsi_start("-drive id=drv1,if=none,file=/dev/null,format=raw");
+    qs = qvirtio_scsi_start("-drive id=drv1,if=none,file=/dev/null,format=raw");
     response = qmp("{\"execute\": \"device_add\","
                    " \"arguments\": {"
                    "   \"driver\": \"scsi-hd\","
@@ -214,7 +209,7 @@ static void hotplug(void)
     g_assert(qdict_haskey(response, "event"));
     g_assert(!strcmp(qdict_get_str(response, "event"), "DEVICE_DELETED"));
     QDECREF(response);
-    qvirtio_scsi_stop();
+    qvirtio_scsi_stop(qs);
 }
 
 /* Test WRITE SAME with the lba not aligned */
@@ -230,9 +225,6 @@ static void test_unaligned_write_same(void)
         0x41, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x33, 0x00, 0x00
     };
 
-    qvirtio_scsi_start("-drive file=blkdebug::null-co://,if=none,id=dr1"
-                       ",format=raw,file.align=4k "
-                       "-device scsi-disk,drive=dr1,lun=0,scsi-id=1");
     vs = qvirtio_scsi_pci_init(PCI_SLOT);
 
     g_assert_cmphex(0, ==,
@@ -242,7 +234,6 @@ static void test_unaligned_write_same(void)
         virtio_scsi_do_command(vs, write_same_cdb_2, NULL, 0, buf2, 512, NULL));
 
     qvirtio_scsi_pci_free(vs);
-    qvirtio_scsi_stop();
 }
 
 int main(int argc, char **argv)
