Error while inserting kvm-intel.ko from kvm-34

Error while inserting kvm-intel.ko from kvm-34

[(अमेय) Ameya (पाळंदे) Palande]

Hi,

Today I downloaded kvm-34.

When i try  to insert kvm-intel.ko module, I get following error,

FATAL: Error inserting kvm_intel
(/lib/modules/2.6.20-16-generic/extra/kvm-intel.ko): Input/output
error

OS               : Ubuntu 7.04 x86
CPU             : Intel core duo T2300
Linux Kernel : 2.6.20-16-generic


Regards,
Ameya.

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Re: Error while inserting kvm-intel.ko from kvm-34

[Avi Kivity]

(अमेय) Ameya (पाळंदे) Palande wrote:
> Hi,
>
> Today I downloaded kvm-34.
>
> When i try  to insert kvm-intel.ko module, I get following error,
>
> FATAL: Error inserting kvm_intel
> (/lib/modules/2.6.20-16-generic/extra/kvm-intel.ko): Input/output
> error
>
> OS               : Ubuntu 7.04 x86
> CPU             : Intel core duo T2300
>   

Can you post the tail of dmesg when you get this?  There's some new code 
that checks for compatible cpus, but it shouldn't trigger.


-- 
error compiling committee.c: too many arguments to function


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Re: Error while inserting kvm-intel.ko from kvm-34

[(अमेय) Ameya (पाळंदे) Palande]

There is nothing in dmesg :(

On 8/13/07, Avi Kivity <avi@qumranet.com> wrote:
> (अमेय) Ameya (पाळंदे) Palande wrote:
> > Hi,
> >
> > Today I downloaded kvm-34.
> >
> > When i try  to insert kvm-intel.ko module, I get following error,
> >
> > FATAL: Error inserting kvm_intel
> > (/lib/modules/2.6.20-16-generic/extra/kvm-intel.ko): Input/output
> > error
> >
> > OS               : Ubuntu 7.04 x86
> > CPU             : Intel core duo T2300
> >
>
> Can you post the tail of dmesg when you get this?  There's some new code
> that checks for compatible cpus, but it shouldn't trigger.
>
>
> --
> error compiling committee.c: too many arguments to function
>
>
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Re: Error while inserting kvm-intel.ko from kvm-34

[Avi Kivity]

(अमेय) Ameya (पाळंदे) Palande wrote:
> There is nothing in dmesg :(
>
>   

urk, there are a zillion lines which return EIO without printing anything.

Can you run

  sed -i 's/-EIO/(printk("kvm: EIO at %d\n", __LINE__), -EIO)/' kernel/vmx.c

recompile, reinsert, and check dmesg?

> On 8/13/07, Avi Kivity <avi@qumranet.com> wrote:
>   
>> (अमेय) Ameya (पाळंदे) Palande wrote:
>>     
>>> Hi,
>>>
>>> Today I downloaded kvm-34.
>>>
>>> When i try  to insert kvm-intel.ko module, I get following error,
>>>
>>> FATAL: Error inserting kvm_intel
>>> (/lib/modules/2.6.20-16-generic/extra/kvm-intel.ko): Input/output
>>> error
>>>
>>> OS               : Ubuntu 7.04 x86
>>> CPU             : Intel core duo T2300
>>>
>>>       
>> Can you post the tail of dmesg when you get this?  There's some new code
>> that checks for compatible cpus, but it shouldn't trigger.
>>
>>
>> --
>> error compiling committee.c: too many arguments to function
>>
>>
>>     


-- 
error compiling committee.c: too many arguments to function


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Re: Error while inserting kvm-intel.ko from kvm-34

[(अमेय) Ameya (पाळंदे) Palande]

I tried running my guest OS which is plan9 without
kvm, and its showing CPU as AMD Athlon on intel machine.

If i remember correctly, earlier qemu used to emulate
intel processor on intel machines.

Is this causing problem ?

Regards,
Ameya.

On 8/13/07, Avi Kivity <avi@qumranet.com> wrote:
> (अमेय) Ameya (पाळंदे) Palande wrote:
> > There is nothing in dmesg :(
> >
> >
>
> urk, there are a zillion lines which return EIO without printing anything.
>
> Can you run
>
>   sed -i 's/-EIO/(printk("kvm: EIO at %d\n", __LINE__), -EIO)/' kernel/vmx.c
>
> recompile, reinsert, and check dmesg?
>
> > On 8/13/07, Avi Kivity <avi@qumranet.com> wrote:
> >
> >> (अमेय) Ameya (पाळंदे) Palande wrote:
> >>
> >>> Hi,
> >>>
> >>> Today I downloaded kvm-34.
> >>>
> >>> When i try  to insert kvm-intel.ko module, I get following error,
> >>>
> >>> FATAL: Error inserting kvm_intel
> >>> (/lib/modules/2.6.20-16-generic/extra/kvm-intel.ko): Input/output
> >>> error
> >>>
> >>> OS               : Ubuntu 7.04 x86
> >>> CPU             : Intel core duo T2300
> >>>
> >>>
> >> Can you post the tail of dmesg when you get this?  There's some new code
> >> that checks for compatible cpus, but it shouldn't trigger.
> >>
> >>
> >> --
> >> error compiling committee.c: too many arguments to function
> >>
> >>
> >>
>
>
> --
> error compiling committee.c: too many arguments to function
>
>
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Re: Error while inserting kvm-intel.ko from kvm-34

[Avi Kivity]

(अमेय) Ameya (पाळंदे) Palande wrote:
> I tried running my guest OS which is plan9 without
> kvm, and its showing CPU as AMD Athlon on intel machine.
>
> If i remember correctly, earlier qemu used to emulate
> intel processor on intel machines.
>
> Is this causing problem ?
>   

No; it's just the qemu default for a 64-bit guest.

-- 
error compiling committee.c: too many arguments to function


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Re: Error while inserting kvm-intel.ko from kvm-34

[(अमेय) Ameya (पाळंदे) Palande]

Hi Avi,

I followed your steps for modifying vmx.c
Here are the messages from dmesg output :

kvm: EIO at 852 kvm: EIO at 882 kvm: EIO at 980

Regards,
Ameya.

On 8/13/07, Avi Kivity <avi@qumranet.com> wrote:
> (अमेय) Ameya (पाळंदे) Palande wrote:
> > There is nothing in dmesg :(
> >
> >
>
> urk, there are a zillion lines which return EIO without printing anything.
>
> Can you run
>
>   sed -i 's/-EIO/(printk("kvm: EIO at %d\n", __LINE__), -EIO)/' kernel/vmx.c
>
> recompile, reinsert, and check dmesg?
>
> > On 8/13/07, Avi Kivity <avi@qumranet.com> wrote:
> >
> >> (अमेय) Ameya (पाळंदे) Palande wrote:
> >>
> >>> Hi,
> >>>
> >>> Today I downloaded kvm-34.
> >>>
> >>> When i try  to insert kvm-intel.ko module, I get following error,
> >>>
> >>> FATAL: Error inserting kvm_intel
> >>> (/lib/modules/2.6.20-16-generic/extra/kvm-intel.ko): Input/output
> >>> error
> >>>
> >>> OS               : Ubuntu 7.04 x86
> >>> CPU             : Intel core duo T2300
> >>>
> >>>
> >> Can you post the tail of dmesg when you get this?  There's some new code
> >> that checks for compatible cpus, but it shouldn't trigger.
> >>
> >>
> >> --
> >> error compiling committee.c: too many arguments to function
> >>
> >>
> >>
>
>
> --
> error compiling committee.c: too many arguments to function
>
>
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Re: Error while inserting kvm-intel.ko from kvm-34

[Avi Kivity]

(अमेय) Ameya (पाळंदे) Palande wrote:
> Hi Avi,
>
> I followed your steps for modifying vmx.c
> Here are the messages from dmesg output :
>
> kvm: EIO at 852 kvm: EIO at 882 kvm: EIO at 980
>
>   

Sheng, this looks like one of the vmx compatibility patches.  Can you 
take a look?

Basically, it seems kvm-34 breaks on all Core cpus (not Core 2).


-- 
error compiling committee.c: too many arguments to function


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Re: Error while inserting kvm-intel.ko from kvm-34

[Glauber de Oliveira Costa]

On 8/14/07, Avi Kivity <avi@qumranet.com> wrote:
> (अमेय) Ameya (पाळंदे) Palande wrote:
> > Hi Avi,
> >
> > I followed your steps for modifying vmx.c
> > Here are the messages from dmesg output :
> >
> > kvm: EIO at 852 kvm: EIO at 882 kvm: EIO at 980
> >
> >
>
> Sheng, this looks like one of the vmx compatibility patches.  Can you
> take a look?
>
> Basically, it seems kvm-34 breaks on all Core cpus (not Core 2).
>
>
 I got the same behaviour here, and it seems that the reason is 32-bit
machines does not use the CR8 register. But the code in vmx.c makes it
a minimum requirement as in:

        min = CPU_BASED_HLT_EXITING |
              CPU_BASED_CR8_LOAD_EXITING |
              CPU_BASED_CR8_STORE_EXITING |
              CPU_BASED_USE_IO_BITMAPS |
              CPU_BASED_MOV_DR_EXITING |
              CPU_BASED_USE_TSC_OFFSETING;

I think the solution is to enclose the CR8 constants in a ifdef
CONFIG_X86_64, since putting them as optional won't do the right thing
in 64-bit (and thus, core duo), machines.

I was about to post a patch for it now.

Avi, if you agree with the fix, I can do it right now.

-- 
Glauber de Oliveira Costa.
"Free as in Freedom"
http://glommer.net

"The less confident you are, the more serious you have to act."
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Re: Error while inserting kvm-intel.ko from kvm-34

[Glauber de Oliveira Costa]

[-- Attachment #1: Type: text/plain, Size: 915 bytes --]

> >
>  I got the same behaviour here, and it seems that the reason is 32-bit
> machines does not use the CR8 register. But the code in vmx.c makes it
> a minimum requirement as in:
>
>         min = CPU_BASED_HLT_EXITING |
>               CPU_BASED_CR8_LOAD_EXITING |
>               CPU_BASED_CR8_STORE_EXITING |
>               CPU_BASED_USE_IO_BITMAPS |
>               CPU_BASED_MOV_DR_EXITING |
>               CPU_BASED_USE_TSC_OFFSETING;
>
> I think the solution is to enclose the CR8 constants in a ifdef
> CONFIG_X86_64, since putting them as optional won't do the right thing
> in 64-bit (and thus, core duo), machines.
>
> I was about to post a patch for it now.
>
> Avi, if you agree with the fix, I can do it right now.
>

BTW, in case you agree, here is the patch

-- 
Glauber de Oliveira Costa.
"Free as in Freedom"
http://glommer.net

"The less confident you are, the more serious you have to act."

[-- Attachment #2: cr8.patch --]
[-- Type: text/x-patch, Size: 942 bytes --]

commit 2863174b39dd8768cd7922832e45ea00d5c6442c
Author: Glauber de Oliveira Costa <glauber@t60.localdomain>
Date:   Tue Aug 14 15:51:22 2007 -0300

    don't create vmcs entries for cr8 when running on 32-bit
    
    This is because cr8 is not available on IA-32. It is just used in 64-bit mode.
    The rdmsr will then report this as not present, and it will lead us to return
    an -EIO.
    
    Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>

diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index 4901339..906d4fa 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -864,8 +864,10 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
 		return -EIO;
 
 	min = CPU_BASED_HLT_EXITING |
+#ifdef CONFIG_X86_64
 	      CPU_BASED_CR8_LOAD_EXITING |
 	      CPU_BASED_CR8_STORE_EXITING |
+#endif
 	      CPU_BASED_USE_IO_BITMAPS |
 	      CPU_BASED_MOV_DR_EXITING |
 	      CPU_BASED_USE_TSC_OFFSETING;

[-- Attachment #3: Type: text/plain, Size: 315 bytes --]

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[-- Attachment #4: Type: text/plain, Size: 186 bytes --]

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Re: Error while inserting kvm-intel.ko from kvm-34

[Yang, Sheng]

OK to me. 
Thanks.

Yang, Sheng
>-----Original Message-----
>From: kvm-devel-bounces@lists.sourceforge.net
>[mailto:kvm-devel-bounces@lists.sourceforge.net] On Behalf Of Glauber de
>Oliveira Costa
>Sent: 2007年8月15日 2:55
>To: Avi Kivity
>Cc: kvm-devel@lists.sourceforge.net; (अमेय) Ameya (पाळंदे) Palande
>Subject: Re: [kvm-devel] Error while inserting kvm-intel.ko from kvm-34
>
>> >
>>  I got the same behaviour here, and it seems that the reason is 32-bit
>> machines does not use the CR8 register. But the code in vmx.c makes it
>> a minimum requirement as in:
>>
>>         min = CPU_BASED_HLT_EXITING |
>>               CPU_BASED_CR8_LOAD_EXITING |
>>               CPU_BASED_CR8_STORE_EXITING |
>>               CPU_BASED_USE_IO_BITMAPS |
>>               CPU_BASED_MOV_DR_EXITING |
>>               CPU_BASED_USE_TSC_OFFSETING;
>>
>> I think the solution is to enclose the CR8 constants in a ifdef
>> CONFIG_X86_64, since putting them as optional won't do the right thing
>> in 64-bit (and thus, core duo), machines.
>>
>> I was about to post a patch for it now.
>>
>> Avi, if you agree with the fix, I can do it right now.
>>
>
>BTW, in case you agree, here is the patch
>
>--
>Glauber de Oliveira Costa.
>"Free as in Freedom"
>http://glommer.net
>
>"The less confident you are, the more serious you have to act."
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Re: Error while inserting kvm-intel.ko from kvm-34

[Avi Kivity]

Glauber de Oliveira Costa wrote:
>>  I got the same behaviour here, and it seems that the reason is 32-bit
>> machines does not use the CR8 register. But the code in vmx.c makes it
>> a minimum requirement as in:
>>
>>         min = CPU_BASED_HLT_EXITING |
>>               CPU_BASED_CR8_LOAD_EXITING |
>>               CPU_BASED_CR8_STORE_EXITING |
>>               CPU_BASED_USE_IO_BITMAPS |
>>               CPU_BASED_MOV_DR_EXITING |
>>               CPU_BASED_USE_TSC_OFFSETING;
>>
>> I think the solution is to enclose the CR8 constants in a ifdef
>> CONFIG_X86_64, since putting them as optional won't do the right thing
>> in 64-bit (and thus, core duo), machines.
>>
>> I was about to post a patch for it now.
>>
>> Avi, if you agree with the fix, I can do it right now.
>>
>>     
>
> BTW, in case you agree, here is the patch
>
>   

Applied, thanks.  Good catch.

> commit 2863174b39dd8768cd7922832e45ea00d5c6442c
> Author: Glauber de Oliveira Costa <glauber-aMxvdZfKFXomYvmMESoHnA@public.gmane.org>
> Date:   Tue Aug 14 15:51:22 2007 -0300

Author email is misconfigured...


-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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Re: Error while inserting kvm-intel.ko from kvm-34

[Glauber de Oliveira Costa]

> > commit 2863174b39dd8768cd7922832e45ea00d5c6442c
> > Author: Glauber de Oliveira Costa <glauber-aMxvdZfKFXomYvmMESoHnA@public.gmane.org>
> > Date:   Tue Aug 14 15:51:22 2007 -0300
>
> Author email is misconfigured...
>
>
Thanks for noting, Avi. I didn't wrote this patch in my usual test
machine, but in my t60. (you could tell).

-- 
Glauber de Oliveira Costa.
"Free as in Freedom"
http://glommer.net

"The less confident you are, the more serious you have to act."

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Re: Error while inserting kvm-intel.ko from kvm-34

[Simon Gao]

Same problem here:


Gentoo 2007.0
CPU Intel Coreduo T2500
Kernel 2.6.21-gentoo-r4


Simon


(अमेय) Ameya (पाळंदे) Palande wrote:
> Hi,
>
> Today I downloaded kvm-34.
>
> When i try  to insert kvm-intel.ko module, I get following error,
>
> FATAL: Error inserting kvm_intel
> (/lib/modules/2.6.20-16-generic/extra/kvm-intel.ko): Input/output
> error
>
> OS               : Ubuntu 7.04 x86
> CPU             : Intel core duo T2300
> Linux Kernel : 2.6.20-16-generic
>
>
> Regards,
> Ameya.
>
> -------------------------------------------------------------------------
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>   


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