Re: [Qemu-devel] [PATCH 12/16] ahci: ncq migration

[Stefan Hajnoczi]

On Mon, Jun 22, 2015 at 08:21:11PM -0400, John Snow wrote:
> @@ -1555,6 +1573,35 @@ static int ahci_state_post_load(void *opaque, int 
> version_id)
>              return -1;
>          }
>  
> +        for (j = 0; j < AHCI_MAX_CMDS; j++) {
> +            ncq_tfs = &ad->ncq_tfs[j];
> +            ncq_tfs->drive = ad;
> +
> +            if (ncq_tfs->used != ncq_tfs->halt) {
> +                return -1;
> +            }
> +            if (!ncq_tfs->halt) {
> +                continue;
> +            }
> +            if (!is_ncq(ncq_tfs->cmd)) {
> +                return -1;
> +            }
> +            if (ncq_tfs->slot != ncq_tfs->tag) {
> +                return -1;
> +            }
> +            if (ncq_tfs->slot > AHCI_MAX_CMDS) {
> +                return -1;
> +            }
> +            ncq_tfs->cmdh = &((AHCICmdHdr *)ad->lst)[ncq_tfs->slot];

Is there a guarantee that ->lst has been mapped?  Maybe pr->cmd &
PORT_CMD_START was 0.

We need to check that the HBA is in a valid state for NCQ processing
before attempting this.

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