This adds a simple test to validate the device is functional: it transmits
a request with type Terror, which is not used by the 9P protocol [1], and
expects QEMU to return a reply with type Rerror and the "Operation not
supported" error string.

[1] http://lxr.free-electrons.com/source/include/net/9p/9p.h#L121

Signed-off-by: Greg Kurz <gr...@kaod.org>
Acked-by: Cornelia Huck <cornelia.h...@de.ibm.com>
---
 tests/virtio-9p-test.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/tests/virtio-9p-test.c b/tests/virtio-9p-test.c
index b8fb6cd869a9..2f579da6cdbd 100644
--- a/tests/virtio-9p-test.c
+++ b/tests/virtio-9p-test.c
@@ -8,6 +8,7 @@
  */
 
 #include "qemu/osdep.h"
+#include <glib/gprintf.h>
 #include "libqtest.h"
 #include "qemu-common.h"
 #include "libqos/pci-pc.h"
@@ -17,6 +18,9 @@
 #include "libqos/malloc-pc.h"
 #include "standard-headers/linux/virtio_ids.h"
 #include "standard-headers/linux/virtio_pci.h"
+#include "hw/9pfs/9p.h"
+
+#define QVIRTIO_9P_TIMEOUT_US (1 * 1000 * 1000)
 
 static const char mount_tag[] = "qtest";
 static char *test_share;
@@ -118,11 +122,69 @@ static void pci_basic_config(void)
     qvirtio_9p_stop();
 }
 
+typedef struct VirtIO9PHdr {
+    uint32_t size;
+    uint8_t id;
+    uint16_t tag;
+} QEMU_PACKED VirtIO9PHdr;
+
+typedef struct VirtIO9PMsgRError {
+    uint16_t error_len;
+    char error[0];
+} QEMU_PACKED VirtIO9PMsgRError;
+
+#define P9_MAX_SIZE 8192
+
+static void pci_basic_transaction(void)
+{
+    QVirtIO9P *v9p;
+    VirtIO9PHdr hdr;
+    VirtIO9PMsgRError *resp;
+    uint64_t req_addr, resp_addr;
+    uint32_t free_head;
+    char *expected_error = strerror(ENOTSUP);
+
+    qvirtio_9p_start();
+    v9p = qvirtio_9p_pci_init();
+
+    hdr.size = sizeof(hdr);
+    hdr.id = P9_TERROR;
+    hdr.tag = 12345;
+
+    req_addr = guest_alloc(v9p->alloc, hdr.size);
+    memwrite(req_addr, &hdr, sizeof(hdr));
+    free_head = qvirtqueue_add(v9p->vq, req_addr, hdr.size, false, true);
+
+    resp_addr = guest_alloc(v9p->alloc, P9_MAX_SIZE);
+    qvirtqueue_add(v9p->vq, resp_addr, P9_MAX_SIZE, true, false);
+
+    qvirtqueue_kick(&qvirtio_pci, v9p->dev, v9p->vq, free_head);
+    guest_free(v9p->alloc, req_addr);
+    qvirtio_wait_queue_isr(&qvirtio_pci, v9p->dev, v9p->vq,
+                           QVIRTIO_9P_TIMEOUT_US);
+
+    memread(resp_addr, &hdr, sizeof(hdr));
+    g_assert_cmpint(hdr.size, <, (uint32_t) P9_MAX_SIZE);
+    g_assert_cmpint(hdr.id, ==, (uint8_t) P9_RERROR);
+    g_assert_cmpint(hdr.tag, ==, (uint16_t) 12345);
+
+    resp = g_malloc(hdr.size);
+    memread(resp_addr + sizeof(hdr), resp, hdr.size - sizeof(hdr));
+    guest_free(v9p->alloc, resp_addr);
+    g_assert_cmpmem(resp->error, resp->error_len, expected_error,
+                    strlen(expected_error));
+    g_free(resp);
+
+    qvirtio_9p_pci_free(v9p);
+    qvirtio_9p_stop();
+}
+
 int main(int argc, char **argv)
 {
     g_test_init(&argc, &argv, NULL);
     qtest_add_func("/virtio/9p/pci/nop", pci_nop);
     qtest_add_func("/virtio/9p/pci/basic/configuration", pci_basic_config);
+    qtest_add_func("/virtio/9p/pci/basic/transaction", pci_basic_transaction);
 
     return g_test_run();
 }
-- 
2.5.5


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