Re: [Qemu-devel] [PULL 00/14] Migration pull request

[Peter Lieven]

Am 20.11.2015 um 12:33 schrieb Peter Maydell:
> On 20 November 2015 at 09:38, Peter Lieven <address@hidden> wrote:
>> I wonder if there is a glitch in the PIO implementation of test-ide.c. As 
>> far as I understand the specs
>> it is not allowed to read data while the BSY flag is set. With the following 
>> change to the test-ide script
>> the test does not race:
>>
>> diff --git a/tests/ide-test.c b/tests/ide-test.c
>> index d1014bb..ab0489e 100644
>> --- a/tests/ide-test.c
>> +++ b/tests/ide-test.c
>> @@ -728,6 +728,7 @@ static void cdrom_pio_impl(int nblocks)
>>      for (i = 0; i < DIV_ROUND_UP(rxsize, limit); i++) {
>>          size_t offset = i * (limit / 2);
>>          size_t rem = (rxsize / 2) - offset;
>> +        ide_wait_clear(BSY);
>>          for (j = 0; j < MIN((limit / 2), rem); j++) {
>>              rx[offset + j] = le16_to_cpu(inw(IDE_BASE + reg_data));
>>          }
>>
>> Note: in the old sync version of the ATAPI PIO implementation this could not 
>> happen.
> This certainly fixes the stalls for me, though I don't know enough
> IDE to say whether it is the correct fix.
Thanks for testing.

I hope that John or Kevin can verify this fix?

Peter