Re: [Qemu-block] [PATCH v2] raw-posix.c: Make physical devices usable in QEMU under Mac OS X host

[Stefan Hajnoczi]

On Fri, Jul 17, 2015 at 03:24:34PM -0400, Programmingkid wrote:
> 
> On Jul 17, 2015, at 9:41 AM, Stefan Hajnoczi wrote:
> 
> > On Thu, Jul 16, 2015 at 04:46:07PM -0400, Programmingkid wrote:
> >> @@ -2014,7 +2015,9 @@ kern_return_t GetBSDPath( io_iterator_t 
> >> mediaIterator, char *bsdPath, CFIndex ma
> >>         if ( bsdPathAsCFString ) {
> >>             size_t devPathLength;
> >>             strcpy( bsdPath, _PATH_DEV );
> >> -            strcat( bsdPath, "r" );
> >> +            if (flags & BDRV_O_NOCACHE) {
> >> +                strcat(bsdPath, "r");
> >> +            }
> >>             devPathLength = strlen( bsdPath );
> >>             if ( CFStringGetCString( bsdPathAsCFString, bsdPath + 
> >> devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
> >>                 kernResult = KERN_SUCCESS;
> > 
> > Is this the fix that makes CD-ROM passthrough work for you?
> > 
> > Does the guest boot successfully when you do:
> > 
> >  -drive if=ide,media=cdrom,cache=none,file=/dev/cdrom
> 
> The guest fails during the boot process with the above command line. 

That means the issue you originally hit hasn't been solved yet.

Take a look at s->needs_alignment and raw_probe_alignment().  In the -drive
cache=none case raw-posix needs to detect the correct alignment (probably 2 KB
for CD-ROMs).

Stefan

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