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Restore atapi_dma flag across migration

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If a migration happens just after the guest has kicked
off an ATAPI command and kicked off DMA, we lose the atapi_dma
flag, and the destination tries to complete the command as PIO
rather than DMA.  This upsets Linux; modern libata based kernels
stumble and recover OK, older kernels end up passing bad data
to userspace.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2014-12-09 18:15:08 +00:00 committed by Kevin Wolf
parent cebbae86b4
commit 819fa27631
1 changed files with 1 additions and 0 deletions
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hw/ide/core.c
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@ -2417,6 +2417,7 @@ static int ide_drive_pio_post_load(void *opaque, int version_id)
s->end_transfer_func = transfer_end_table[s->end_transfer_fn_idx];
s->data_ptr = s->io_buffer + s->cur_io_buffer_offset;
s->data_end = s->data_ptr + s->cur_io_buffer_len;
s->atapi_dma = s->feature & 1; /* as per cmd_packet */
return 0;
}