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Re: [Qemu-devel] [PATCH v3 1/1] hw/scsi: support SCSI-2 passthrough with

From: Daniel Henrique Barboza
Subject: Re: [Qemu-devel] [PATCH v3 1/1] hw/scsi: support SCSI-2 passthrough without PI
Date: Thu, 5 Apr 2018 13:09:39 -0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

On 04/05/2018 12:56 PM, Paolo Bonzini wrote:
On 27/03/2018 23:14, Daniel Henrique Barboza wrote:
          /* We get here only for BYTCHK == 0x01 and only for scsi-block.
           * As far as DMA is concerned, we can treat it the same as a write;
           * scsi_block_do_sgio will send VERIFY commands.
+         *
+         * For scsi versions 2 and older, the BYTCHK isn't related
+         * to VRPROTECT (in fact, there is no VRPROTECT). Skip
+         * this check in these versions.
-        if (r->req.cmd.buf[1] & 0xe0) {
+        if ((r->req.cmd.buf[1] & 0xe0) && (s->qdev.scsi_version > 2)) {
              goto illegal_request;
This also has to check for "s->qdev.scsi_version != -1" so that the
behavior of emulated SCSI isn't changed (they claim SPC-3).  I made this
change and queued the patch.

Good catch.



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