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 [..] Thanks, WANG Chao > > Thanks > > Yinghai >
