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From: Laurent Vivier <Laurent.Vivier@bull.net>
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Subject: [Qemu-devel] [PATCH 0/2 v2] Open disk images with O_DIRECT
Reply-To: Laurent Vivier <Laurent.Vivier@bull.net>, qemu-devel@nongnu.org
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Cc: qemu-devel@nongnu.org


These patches allow to open file using O_DIRECT and bypass the host I/O cac=
he.

The v2 is a new version including comments from Anthony Liguori ("directio"=
=20
has been renamed "cache"), from Balazs Attila-Mihaly (for Win32 support,=20
not tested) and Samuel Thibault (for the generic function qemu_memalign()".

[PATCH 1/2] Add "cache" parameter to "-drive"

    Using "cache=3Doff" with "-drive" will open the disk image=20
    file using "O_DIRECT".

[PATCH 2/2] Direct IDE I/O

    This patch enhances the "-drive ,cache=3Doff" mode with IDE drive emula=
tion
    by removing the buffer used in the IDE emulation.

Laurent