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Re: [Qemu-devel] [PATCH v1 2/2] tests: add test to check VirtQueue objec
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH v1 2/2] tests: add test to check VirtQueue object |
Date: |
Fri, 24 Nov 2017 11:49:20 +0000 |
User-agent: |
Mutt/1.9.1 (2017-09-22) |
On Fri, Nov 24, 2017 at 01:25:42PM +0530, P J P wrote:
> From: Prasad J Pandit <address@hidden>
>
> 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 <address@hidden>
> ---
> 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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