On 05/04/15 at 01:05pm, Joerg Roedel wrote: > On Fri, Apr 03, 2015 at 04:40:31PM +0800, Dave Young wrote: > > Have not read all the patches, but I have a question, not sure this > > has been answered before. Old memory is not reliable, what if the old > > memory get corrupted before panic? Is it safe to continue using it in > > 2nd kernel, I worry that it will cause problems. > > Yes, the old memory could be corrupted, and there are more failure cases > left which we have no way of handling yet (if iommu data structures are > in kdump backup areas). > > The question is what to do if we find some of the old data structures > corrupted, hand how far should the tests go. Should we also check the > page-tables, for example? I think if some of the data structures for a > device are corrupted it probably already failed in the old kernel and > things won't get worse in the new one. I agree that we can do nothing with the old corrupted data, but I worry about the future corruption after using the old corrupted data. I wonder if we can mark all the oldmem as readonly so that we can lower the risk. Is it resonable? Thanks Dave -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
