On Thu, Mar 7, 2013 at 11:33 PM, WANG Chao <chaowang at redhat.com> wrote: > On 03/08/2013 03:27 PM, Yinghai Lu wrote: >> On Thu, Mar 7, 2013 at 11:20 PM, WANG Chao <chaowang at redhat.com> wrote: >>>> >>>> looks like your system DO have DMAR table, please enable dmar >>>> remapping in your kernel config. >>> >>> I've already got following config: >>> CONFIG_DMAR_TABLE=y >>> CONFIG_INTEL_IOMMU=y >>> CONFIG_IRQ_REMAP=y >>> >>> but I don't have intel_iommu=on in kernel cmdline. IIRC, iommu will prevent >>> 2nd kernel from booting ... >> >> Did you put intel_iommu=on on first and second cpu both? > > I tried, 2nd kernel didn't boot and keep splitting errors like these: > [ 2.106939] DMAR: No ATSR found > [ 2.110121] IOMMU 0 0xfed90000: using Queued invalidation > [ 2.115522] IOMMU 1 0xfed91000: using Queued invalidation > [ 2.120919] IOMMU: Setting RMRR: > [ 2.124162] IOMMU: Setting identity map for device 0000:00:02.0 [0xab800000 > - 0xaf9fffff] > [ 2.133099] IOMMU: Setting identity map for device 0000:00:1d.0 [0xaac95000 > - 0xaacb2fff] > [ 2.141305] IOMMU: Setting identity map for device 0000:00:1a.0 [0xaac95000 > - 0xaacb2fff] > [ 2.149503] IOMMU: Setting identity map for device 0000:00:14.0 [0xaac95000 > - 0xaacb2fff] > [ 2.157690] IOMMU: Prepare 0-16MiB unity mapping for LPC > [ 2.163011] IOMMU: Setting identity map for device 0000:00:1f.0 [0x0 - 0xffffff > [Errors, here we go] > [ 2.170932] dmar: DRHD: handling fault status reg 3 > [ 2.170933] PCI-DMA: Intel(R) Virtualization Technology for Directed I/O > [ 2.182486] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr ffffe000 > [ 2.182486] DMAR:[fault reason 05] PTE Write access is not set > [ 2.195705] dmar: DRHD: handling fault status reg 3 > [ 2.200570] dmar: DMAR:[DMA Read] Request device [00:02.0] fault addr ff873000 > [ 2.200570] DMAR:[fault reason 06] PTE Read access is not set > [ 2.213618] dmar: DRHD: handling fault status reg 3 my Nehalem-EX and Westmere-EX is working with iommu enabled in second kernel. what is 00:02.0 in your system? Is your kernel upsteam kernel or redhat flavor one? Thanks Yinghai
