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Re: [Xen-devel] Fixed: RMRR is incorrect (was: VT-d does not work any more after BIOS update on DQ35MP)

"Ralf Hornik Mailings" <ralf@xxxxxxxxxxxxxxxxx> schreibte:

Finally, I downgraded to the second previous bios version and now VT-d works again.

Another issue I figured out (bios independend) is a page fault when booing xen 3.3/unstable with vtd anabled:

(XEN) Brought up 4 CPUs
(XEN) I/O virtualisation enabled
(XEN) I/O virtualisation for PV guests disabled
(XEN) [VT-D]iommu.c:747: iommu_page_fault: iommu->reg = ffff828bfff56000
(XEN) [VT-D]iommu.c:716: iommu_fault_status: Fault Overflow
(XEN) [VT-D]iommu.c:701: iommu_fault:DMA Write: 0:2.0 addr ffffff000 REASON 5 iommu->reg = ffff828bfff56000
(XEN) print_vtd_entries: iommu = ffff83007c20d010 bdf = 0:2:0 gmfn = ffffff
(XEN)     root_entry = ffff83007a4d3000
(XEN)     root_entry[0] = 7d060001
(XEN)     context = ffff83007d060000
(XEN)     context[10] = 101_7bff9001
(XEN)     l3 = ffff83007bff9000
(XEN)     l3_index = 3f
(XEN)     l3[3f] = 0
(XEN)     l3[3f] not present

What does this mean? However, I do not encounter any relating problems yet...


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