Re: installing kvm-76 on 2.6.24

[Sterling Windmill <sterling@ampx.net>]

I am able to run kvm-76 after recompiling my kernel with DMAR unset.

Thanks for the help!

----- Original Message ----- 
From: "Sheng Yang" <yasker@gmail.com> 
To: "Sterling Windmill" <sterling@ampx.net> 
Cc: "kvm" <kvm@vger.kernel.org> 
Sent: Monday, September 29, 2008 11:29:56 AM GMT -05:00 US/Canada Eastern 
Subject: Re: installing kvm-76 on 2.6.24 

On Mon, Sep 29, 2008 at 11:18 PM, Sterling Windmill <sterling@ampx.net> wrote: 
> It seems as though I need to insert vtd.o instead of vtd.c 

Yeah... That's vtd.o :) 

And I forgot, if you want to compile vtd.c, you need compile kvm 
kernel space rather than other kernel version for we modified host 
kernel side. 

Sorry for I don't have a box by hand so that I can't check every detail... 

I suppose you want to keep your kernel? Maybe disable CONFIG_DMAR is 
more easy... 

-- 
regards, 
Yang, Sheng 
> 
> My Kbuild file now looks like this: 
> 
> # trick to get the kvm-specific CONFIG_KVM_* definitions, 
> # because the kernel source tree won't have them 
> include $(obj)/../config.kbuild 
> 
> obj-m := kvm.o kvm-intel.o kvm-amd.o 
> kvm-objs := vtd.o kvm_main.o x86.o mmu.o x86_emulate.o ../anon_inodes.o irq.o i8 259.o \ 
> lapic.o ioapic.o preempt.o i8254.o coalesced_mmio.o \ 
> ../external-module-compat.o 
> ifeq ($(EXT_CONFIG_KVM_TRACE),y) 
> kvm-objs += kvm_trace.o 
> endif 
> kvm-intel-objs := vmx.o vmx-debug.o ../external-module-compat.o 
> kvm-amd-objs := svm.o ../external-module-compat.o 
> 
> CFLAGS_kvm_main.o = -DKVM_MAIN 
> 
> The modules do compile with this option specified. 
> 
> Unfortunately, the error inserting the modules still persists. 
> 
> Any other ideas? 
> 
> ----- Original Message ----- 
> From: "Sheng Yang" <yasker@gmail.com> 
> To: "Sterling Windmill" <sterling@ampx.net> 
> Cc: "kvm" <kvm@vger.kernel.org> 
> Sent: Monday, September 29, 2008 10:51:53 AM GMT -05:00 US/Canada Eastern 
> Subject: Re: installing kvm-76 on 2.6.24 
> 
> On Mon, Sep 29, 2008 at 10:42 PM, Sterling Windmill <sterling@ampx.net> wrote: 
>> Thank you for the information. I apologize for posting twice to the mailing list on the same issue. I was just trying to add some additional information. 
>> 
>> Could you tell me how to edit the Kbuild file for this purpose? I can also recompile my kernel, but that's a bit more difficult. 
> 
> Add vtd.c to kvm-userspace/kernel/x86/Kbuild kvm-objs item should get it done. 
> 
> -- 
> regards, 
> Yang, Sheng 
>> 
>> Thanks in advance, 
>> Sterling Windmill 
>> 
>> ----- Original Message ----- 
>> From: "Sheng Yang" <yasker@gmail.com> 
>> To: "Sterling Windmill" <sterling@ampx.net> 
>> Cc: "kvm" <kvm@vger.kernel.org> 
>> Sent: Monday, September 29, 2008 10:21:10 AM GMT -05:00 US/Canada Eastern 
>> Subject: Re: installing kvm-76 on 2.6.24 
>> 
>> On Mon, Sep 29, 2008 at 1:09 PM, Sterling Windmill <sterling@ampx.net> wrote: 
>>> I am running a custom compiled 2.6.24 kernel on a 64-bit Intel system and had no issues compling and running kvm-75. 
>>> 
>>> I downloaded kvm-76 and compiled and installed it, but I cannot get the modules to load properly. 
>>> 
>>> I have temporarily gone back to kvm-75. 
>>> 
>>> I am seeing this output in dmesg: 
>>> 
>>> kvm: Unknown symbol kvm_iommu_map_pages 
>>> kvm: Unknown symbol kvm_iommu_map_guest 
>>> kvm: Unknown symbol kvm_iommu_unmap_guest 
>> 
>> Seems you enabled CONFIG_DMAR in host kernel side? In theory, we 
>> should use CONFIG_DMAR with newly VT-d support in KVM, but the problem 
>> now is that userspace including compile option is not ready, so here 
>> comes compile problem. 
>> 
>> If you want to try kvm-76, you may try to disable CONFIG_DMAR in host 
>> kernel. Or just wait to userspace VT-d support merge (of course you 
>> can add vtd.c manually in Kbuild to overcome this compile issue). :) 
>> 
>> -- 
>> regards, 
>> Yang, Sheng 
>> 
>