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


From: Jason Wang
Subject: Re: [Qemu-devel] [PATCH 0/2] ignore bus master for e1000
Date: Fri, 19 Dec 2014 05:08:58 +0008



On Fri, Dec 19, 2014 at 11:09 AM, Amos Kong <address@hidden> 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 <address@hidden> 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.




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