ahci: Correct PIO/D2H FIS responses
Currently, the D2H FIS packets AHCI generates simply parrot back the LBA that the guest sent to us in the cmd_fis. However, some commands (like READ NATIVE MAX) modify the LBA registers as a return value, through which the AHCI D2H FIS is the only response mechanism. Thus, the D2H response should use the current register values, not the initial ones. This patch adjusts the LBA and drive select register responses for PIO Setup and D2H FIS response packets. Additionally, the PIO and D2H FIS responses copy too many bytes from the command FIS that it is being generated from. Specifically, byte 11 which is the Features(15:8) field for Register Host to Device FIS packets, is instead reserved for the PIO Setup FIS and should always be 0. Signed-off-by: NJohn Snow <jsnow@redhat.com> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Tested-by: NMichael S. Tsirkin <mst@redhat.com> Message-id: 1412204151-18117-2-git-send-email-jsnow@redhat.com Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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