From: Nikita Leshchenko nikita.leshchenko@oracle.com
When mpt-scsi receives a SCSI message, it wraps it in a MPT request message and writes it's address to an IO port to be added to the request queue.
This MPT request is allocated on the stack. Previous to this commit, the request is aligned to 4 bytes. However, VirtualBox LSI53c1030 device emulation aligns the request address to 8 bytes. Therefore, this commit change alignment of request to 8 bytes.
VirtualBox source code which handles this is at Devices/Storage/DevLsiLogicSCSI.cpp. lsilogicRegisterWrite() LSILOGIC_REG_REQUEST_QUEUE handler adds the request to the queue (pRequestQueueBase). lsilogicR3Worker() reads request from pRequestQueueBase and aligns it to 8 bytes (u32RequestMessageFrameDesc & ~0x07).
Reviewed-by: Liran Alon liran.alon@oracle.com Reviewed-by: Mark Kanda mark.kanda@oracle.com Signed-off-by: Nikita Leshchenko nikita.leshchenko@oracle.com --- src/hw/mpt-scsi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/hw/mpt-scsi.c b/src/hw/mpt-scsi.c index 1faede6aec6f..9966ca28054f 100644 --- a/src/hw/mpt-scsi.c +++ b/src/hw/mpt-scsi.c @@ -124,7 +124,7 @@ mpt_scsi_cmd(u32 iobase, struct disk_op_s *op, struct scsi_req { MptSCSIIORequest_t scsi_io; MptSGEntrySimple32_t sge; - } __attribute__((packed, aligned(4))) req = { + } __attribute__((packed, aligned(8))) req = { .scsi_io = { .TargetID = target, .Bus = 0,