On Tue, 2011-11-01 at 17:19 +0800, Dave Young wrote: > kdump kernel sometimes will get DMAR faults which > is caused by random in-flight dma from 1st kernel > > Here make the identity_mapping as default for this case So you want to *allow* the random in-flight DMA? And with an identity mapping it's really going to random addresses, since it'll be untranslated and won't even go to the physical addresses which it was originally intended for? This seems entirely broken to me. If there is "random in-flight dma" from the first kernel, the correct thing to do is *block* it. Which is what we do. -- dwmw2 -------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/x-pkcs7-signature Size: 5818 bytes Desc: not available URL: <http://lists.infradead.org/pipermail/kexec/attachments/20111101/5e21ad68/attachment.bin>
