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

[Programmingkid]

On Jul 20, 2015, at 8:46 AM, Laurent Vivier wrote:

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> On 20/07/2015 12:48, Stefan Hajnoczi wrote:
>> 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).
> 
> As raw_open_common() sets needs_alignment to true on BDRV_O_NOCACHE
> (cache="none") and raw_probe_alignment() detects alignment if
> needs_alignment is true, I don't understand why it doesn't work.
> 
> Could you explain ?


I just did several tests with real CD-ROM discs and it does work. I first 
booted up Mac OS 10.2 with Stefan's command options using a professionally made 
CD, and it worked. I then did the same test again using a burned CD-R disc and 
it also worked. The last test I did was just listing the files from OpenBIOS 
using this: qemu-system-ppc -drive 
if=ide,media=cdrom,cache=none,file=/dev/cdrom. All tests were a success. 

Mac OS 10.2 panicked while booting in the original test using Stefan's command. 
I remember the panic happened about a minute into the boot process, so it could 
have been a guest issue rather than a QEMU issue. Either way everything is 
working now.