Messages in this thread | | | Date | Thu, 7 May 2015 21:25:36 +0800 | From | Dave Young <> | Subject | Re: [PATCH v9 0/10] iommu/vt-d: Fix intel vt-d faults in kdump kernel |
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On 05/06/15 at 10:16am, Joerg Roedel wrote: > On Wed, May 06, 2015 at 09:46:49AM +0800, Dave Young wrote: > > For the original problem, the key issue is dmar faults cause kdump kernel > > hang so that vmcore can not be saved. I do not know the reason why it hangs > > I think it is acceptable if kdump kernel boot ok with some dma errors.. > > It hangs because some devices can't handle the DMAR faults and the kdump > kernel can't initialize them and will hang itself. For that it doesn't > matter whether the fault was caused by a read or write request.
Ok, thanks for explanation. so it explains sometimes kdump kernel boot ok with faults, sometimes it hangs instead.
Dave
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