Messages in this thread | | | Date | Mon, 11 Mar 2013 12:56:42 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] x86, kdump: Set crashkernel_low automatically |
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On 03/11/2013 12:14 PM, Eric W. Biederman wrote: > > I don't totally follow the reasoning, but there is one real motivating > example that is not easy to fix and it has little to do with > kexec-tools. There is a practical issue that so far the easiest way > to deal with iommus after a kexec on panic is to just not use them. > The problem is what to do with existing DMAs transfers that were setup > by the kernel that crashed and are using the iommu. > > When you are loaded above 4G not using iommus can be a challenge. >
Isn't that what swiotlb is for?
-hpa
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