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author | Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> | 2012-03-29 10:31:30 +0100 |
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committer | Kevin Wolf <kwolf@redhat.com> | 2012-04-19 16:03:27 +0200 |
commit | bef0fd5958120542f126f2dedbfce65d8839a94d (patch) | |
tree | bd1dab13e51821dc3ad80d8fb18faf39e6a24475 /arm-dis.c | |
parent | 592fa07043095ba3141fb9d413693d3c202cba9a (diff) | |
download | qemu-bef0fd5958120542f126f2dedbfce65d8839a94d.zip qemu-bef0fd5958120542f126f2dedbfce65d8839a94d.tar.gz qemu-bef0fd5958120542f126f2dedbfce65d8839a94d.tar.bz2 |
ide: convert ide_sector_read() to asynchronous I/O
The IDE PIO interface currently uses bdrv_read() to perform reads
synchronously. Synchronous I/O in the vcpu thread is bad because it
prevents the guest from executing code - it makes the guest
unresponsive.
This patch converts IDE PIO to use bdrv_aio_readv(). We simply need to
use the BUSY_STAT status so the guest knows to wait while we are busy.
The only external user of ide_sector_read() is restart behavior on I/O
errors and it is not affected by this change. We still need to restart
I/O in the same way.
Migration is also unaffected if I understand the code correctly. We
continue to use the same transfer function and the BUSY_STAT status
should never be migrated since we flush I/O before migrating device
state.
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Tested-by: Richard Davies <richard@arachsys.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'arm-dis.c')
0 files changed, 0 insertions, 0 deletions