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ahci: Recompute cur_cmd on migrate post load

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When the AHCI HBA device is migrated, all of the information that
led to the request being created is stored in the AHCIDevice
structures, except for pointers into guest data where return
information needs to be stored.

The "cur_cmd" field is usually responsible for this.

To rebuild the cur_cmd pointer post-migration, we can utilize
the busy_slot index to figure out where the command header
we are still processing is.

This allows a machine in a halted state from rerror=stop or
werror=stop to be migrated and resume operations without issue.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 1424708286-16483-17-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
John Snow 2015-02-23 11:18:05 -05:00 committed by Kevin Wolf
parent e8ef87433e
commit c27c73aaf9
1 changed files with 7 additions and 0 deletions
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7
hw/ide/ahci.c
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@ -1376,6 +1376,13 @@ static int ahci_state_post_load(void *opaque, int version_id)
*/ */
if (ad->busy_slot == -1) { if (ad->busy_slot == -1) {
check_cmd(s, i); check_cmd(s, i);
} else {
/* We are in the middle of a command, and may need to access
* the command header in guest memory again. */
if (ad->busy_slot < 0 || ad->busy_slot >= AHCI_MAX_CMDS) {
return -1;
}
ad->cur_cmd = &((AHCICmdHdr *)ad->lst)[ad->busy_slot];
} }
} }