Re: [Qemu-devel] [PATCH 0/2] ignore bus master for e1000

[Jason Wang <jasowang@redhat.com>]

On Fri, Dec 19, 2014 at 11:09 AM, Amos Kong <akong@redhat.com> wrote:
> On Thu, Dec 18, 2014 at 10:13:07AM +0008, Jason Wang wrote:
>>  
>>  
>>  On Thu, Dec 18, 2014 at 5:22 PM, Amos Kong <akong@redhat.com> wrote:
>>  >Win2012-64r2 guest doesn't set bus mastering correctly,
>>  >it caused guest network down, this patch ignored it for
>>  >e1000 nic for workarounding the guest issue.
>>  >
>>  >Patch 1 is an update version of:
>>  >http://lists.gnu.org/archive/html/qemu-devel/2014-12/msg00048.html
>>  >transmit packets are also defered in latest version.
>>  >
>>  >Amos Kong (1):
>>  >  e1000: unconditionally enable bus mastering
>>  >
>>  >Michael S. Tsirkin (1):
>>  >  e1000: defer packets until BM enabled
>>  >
>>  > hw/net/e1000.c | 34 +++++++++++++++++++++++++++++++++-
>>  > 1 file changed, 33 insertions(+), 1 deletion(-)
>>  >
>>  >-- 
>>  >2.1.0
>>  
>>  Another question unrelated to this series:
>>  Does 82540EM still supported by Win2k12?
> 
> 82540EM isn't in the support list. Some users want to use emulated
> e1000 to debug Windows guests. I will try other emulated nics in QEMU.

Right, but I suspect the issue may be still. But let's see.
> 
>>  The following link shows that 82540EM were not supported in Win2k12.
>>  
>> https://downloadcenter.intel.com/SearchResult.aspx?lang=eng&ProdId=983
>>  
>>  The oldest 825x card supported by 2k12 seems 82574.
>>  
>> https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=21694&lang=eng&ProdId=3189
>  
>>  If yes, workaround a buggy driver may be endless work in the future.
> 
> I think so.
> 
> -- 
> 			Amos.