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Re: [Qemu-block] [Qemu-devel] [PATCH v6 3/6] tests: in IDE and AHCI test

From: Eric Blake
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH v6 3/6] tests: in IDE and AHCI tests perform DMA write before flushing
Date: Thu, 14 Jul 2016 10:05:16 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0

On 07/14/2016 06:29 AM, Denis V. Lunev wrote:
> From: Evgeny Yakovlev <address@hidden>
> Due to changes in flush behaviour clean disks stopped generating
> flush_to_disk events and IDE and AHCI tests that test flush commands
> started to fail.
> This change adds additional DMA writes to affected tests before sending
> flush commands so that bdrv_flush actually generates flush_to_disk event.
> Signed-off-by: Evgeny Yakovlev <address@hidden>
> Signed-off-by: Denis V. Lunev <address@hidden>
> Reviewed-by: Paolo Bonzini <address@hidden>
> CC: Kevin Wolf <address@hidden>
> CC: Max Reitz <address@hidden>
> CC: Stefan Hajnoczi <address@hidden>
> CC: Fam Zheng <address@hidden>
> CC: John Snow <address@hidden>
> ---
>  tests/ahci-test.c | 34 ++++++++++++++++++++++++++++++++--
>  tests/ide-test.c  | 43 +++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 75 insertions(+), 2 deletions(-)
> diff --git a/tests/ahci-test.c b/tests/ahci-test.c
> index 57dc44c..d707714 100644
> --- a/tests/ahci-test.c
> +++ b/tests/ahci-test.c
> @@ -1063,11 +1063,34 @@ static void test_dma_fragmented(void)
>      g_free(tx);
>  }
> +/*
> + * Write sector 0 with random data to make AHCI storage dirty

If we ever have a case where we open a disk without specifying -raw, the
random data _might_ resemble some other format and cause probe to
misbehave; as such, we also have code in the block layer that
specifically prevents writes to sector 0 for some data. Should you pick
a different sector than 0, so as to avoid any (remote) possibility that
the random data could change probe results or be rejected?

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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