On Tue, Aug 23, 2011 at 9:18 PM, Hilco Wijbenga <hilco.wijbe...@gmail.com> wrote: > On 23 August 2011 20:38, Mark Knecht <markkne...@gmail.com> wrote: >> Hi all, >> Can someone point me toward somehow enabling CONFIG_IOMMU_SUPPORT? >> It is apparently a kernel config option no required by >> virtualbox-drivers but I'm not finding it in the 3.0.3 kernel. I >> suspect there's something else I need to enable before this option >> becomes available? Unfortunately I haven't been able to Google what I >> need to do to find it. >> >> Thanks, >> Mark >> >> * Messages for package app-emulation/virtualbox-modules-4.1.2: >> >> * CONFIG_IOMMU_SUPPORT: is not set when it should be. >> * Please check to make sure these options are set correctly. >> * Failure to do so may cause unexpected problems. >> <SNIP> >> >> k2 linux # cat .config | grep IOMMU >> CONFIG_GART_IOMMU=y >> # CONFIG_CALGARY_IOMMU is not set >> CONFIG_AMD_IOMMU=y >> # CONFIG_AMD_IOMMU_STATS is not set >> CONFIG_IOMMU_HELPER=y >> CONFIG_IOMMU_API=y >> # CONFIG_IOMMU_DEBUG is not set >> # CONFIG_IOMMU_STRESS is not set >> k2 linux # > > I noticed the same. There does not appear to be any such option but > luckily its absence does not appear to affect running VB at all. >
At the time of writing this I haven't tried Gregory's item about the CONFIG_CALGARY_IOMMU option. I'll try that later when I get to the machine but the reading I did on the web sounded like that was for IBM specific hardware. Here it seems that on the machine I was working - Intel based, i920 - VB won't install Win 7 64-bit without it. I get a bunch of messages that it will install but many cause problems. Are you running any 64-bit VMs? However I've got another Intel machine where I can install Win 7 64-bit in VB just fine with no complaints at all. Here's the IOMMU stuff from that box: mark@c2stable ~ $ uname -a Linux c2stable 3.0.1-gentoo #1 SMP PREEMPT Mon Aug 8 13:05:19 PDT 2011 x86_64 Intel(R) Core(TM) i7 CPU X 980 @ 3.33GHz GenuineIntel GNU/Linux mark@c2stable ~ $ zcat /proc/config.gz | grep IOMMU CONFIG_GART_IOMMU=y # CONFIG_CALGARY_IOMMU is not set # CONFIG_AMD_IOMMU is not set CONFIG_IOMMU_HELPER=y CONFIG_IOMMU_API=y # CONFIG_IOMMU_DEBUG is not set # CONFIG_IOMMU_STRESS is not set mark@c2stable ~ $ Except for the AMD option they seem identical unless I'm misreading something. I'm now wondering if there is both a BIOS and chipset component to making this work? I'm pretty sure I've got all the Vt-d stuff enabled but I'll have to wait to go into BIOS on both of them to compare. I'll try to do a diff later today between both machine's .config files to look for differences. Cheers, Mark
