On Wed, Aug 24, 2011 at 11:58 AM, Hilco Wijbenga <hilco.wijbe...@gmail.com> wrote: > On 24 August 2011 10:55, Mark Knecht <markkne...@gmail.com> wrote: >> 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? > > Sort of. I'm working on installing Gentoo AMD64 in a VB machine. No > problems so far but I've only just started (it's a weekend project). > Certainly no Windows. > >> 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. > > Can't you simply install the Calgary IOMMU as well? I know that it > seems IBM based stuff (I noticed it myself when I was going through > the same process) which you probably do not need but I assume it can't > hurt (apart from making the kernel a bit bigger). But if it fixes your > problem... Probably worth a try. > >
I Agree and will try it. I was only saying I didn't previously because all the write ups made it sound like it was for some other purpose. I think my other question is where does this message about CONFIG_IOMMU_SUPPORT get generated? Is it in the ebuild? If so then is the ebuild incorrect because the option doesn't exist? Or does the option exist but I cannot figure out how to get make menuconfig to make it available? There are a number of web pages like this one: http://cateee.net/lkddb/web-lkddb/IOMMU_SUPPORT.html which seem to indicate that I should see an IOMMU option somewhere in the drivers section of the kernel config. I do not, however, find that right now which is why I came here to ask. Anyway, I will be trying that later today. Cheers, Mark
