Re: [Qemu-devel] [PATCH v1 2/2] tests: add test to check VirtQueue object

[Stefan Hajnoczi <stefanha@redhat.com>]

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On Fri, Nov 24, 2017 at 01:25:42PM +0530, P J P wrote:
> From: Prasad J Pandit <pjp@fedoraproject.org>
> 
> An uninitialised VirtQueue object or one with Vring.align field
> set to zero(0) could lead to arithmetic exceptions. Add a unit
> test to validate it.
> 
> Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
> ---
>  tests/virtio-blk-test.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/tests/virtio-blk-test.c b/tests/virtio-blk-test.c
> index e6fb9bac87..d00ceb0501 100644
> --- a/tests/virtio-blk-test.c
> +++ b/tests/virtio-blk-test.c
> @@ -674,6 +674,26 @@ static void pci_hotplug(void)
>      qtest_shutdown(qs);
>  }
>  
> +static void test_vring_align(void)

It's important to include a doc comment so the purpose of the test is
clear:

/*
 * Check that setting the vring addr on a non-existent virtqueue does
 * not crash.
 */

I think the _align name is confusing since the vring alignment is not
directly affected by this test case.  Please call it
test_nonexistent_virtqueue() instead.

> +{
> +    QPCIBar bar0;
> +    QOSState *qs;
> +    QPCIDevice *dev;
> +
> +    qs = pci_test_start();
> +    dev = qpci_device_find(qs->pcibus, QPCI_DEVFN(4, 0));
> +    g_assert(dev != NULL);
> +
> +    qpci_device_enable(dev);
> +    bar0 = qpci_iomap(dev, 0, NULL);
> +
> +    qpci_io_writeb(dev, bar0, VIRTIO_PCI_QUEUE_SEL, 2);
> +    qpci_io_writel(dev, bar0, VIRTIO_PCI_QUEUE_PFN, 1);
> +
> +    g_free(dev);
> +    qtest_shutdown(qs);
> +}


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