[ANNOUNCE] kvm-56 release

[ANNOUNCE] kvm-56 release

[Avi Kivity]

This restores live migration support which has been broken for a couple 
of releases.  Also, if you had Java problems please test kvm-56, as it 
has some nx related permission fixes.

Changes from kvm-55:
- Generalize exception handling mechanism
- fix x86 emulator eflags handling
- avoid exit to userspace on cr8 write if using kernel lapic on Intel
- fix stack instructions emulation in 64-bit mode
   - fixes Vista x86
     - except on Woodcrests
- trap cr8 access on amd
- mmu simplification
- fix setting nx bit on shadow pte
- fix inherited mmu permissions
- more portability work (Hollis Blanchard, Xiantao Zhang)
- add cr8 to 'mov cr' instruction emulation (Joerg Roedel)
- exit to userspace on cr8 write if not kernel apic on amd (Joerg Roedel)
- atomically set accessed and dirty bit on guest ptes (Marcelo Tosatti)
- use ->fault() vma op instead of ->nopage()
- remove abi 10 libkvm compatibility
- add some x86 emulator tests
- add many mmu access tests
- fix rpm build on Fedora 8 (Dan Kenigsberg)
- fix 'make sync' on debian and derivatives (Ryan Harper)
- fix live migration (Uri Lublin, Izik Eidus)
- initial ia64 userspace (Xiantao Zhang)


Notes:
      If you use the modules bundled with kvm-56, you can use any version
of Linux from 2.6.9 upwards.
      If you use the modules bundled with Linux 2.6.20, you need to use
kvm-12.
      If you use the modules bundled with Linux 2.6.21, you need to use
kvm-17.
      Modules from Linux 2.6.22 and up will work with any kvm version from
kvm-22.  Some features may only be available in newer releases.
      For best performance, use Linux 2.6.23-rc2 or later as the host.

http://kvm.qumranet.com


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Re: [ANNOUNCE] kvm-56 release

[Pelle]

I get the following error when modprobing the new module:

WARNING: Error inserting kvm 
(/lib/modules/2.6.22-14-generic/extra/kvm.ko): Unknown symbol in module, 
or unknown parameter (see dmesg)
kvm: Unknown symbol cmpxchg64

Ubuntu 7.10 32-bits, C2D E6300

Pelle.

Avi Kivity wrote:
> This restores live migration support which has been broken for a couple 
> of releases.  Also, if you had Java problems please test kvm-56, as it 
> has some nx related permission fixes.
>
> Changes from kvm-55:
> - Generalize exception handling mechanism
> - fix x86 emulator eflags handling
> - avoid exit to userspace on cr8 write if using kernel lapic on Intel
> - fix stack instructions emulation in 64-bit mode
>    - fixes Vista x86
>      - except on Woodcrests
> - trap cr8 access on amd
> - mmu simplification
> - fix setting nx bit on shadow pte
> - fix inherited mmu permissions
> - more portability work (Hollis Blanchard, Xiantao Zhang)
> - add cr8 to 'mov cr' instruction emulation (Joerg Roedel)
> - exit to userspace on cr8 write if not kernel apic on amd (Joerg Roedel)
> - atomically set accessed and dirty bit on guest ptes (Marcelo Tosatti)
> - use ->fault() vma op instead of ->nopage()
> - remove abi 10 libkvm compatibility
> - add some x86 emulator tests
> - add many mmu access tests
> - fix rpm build on Fedora 8 (Dan Kenigsberg)
> - fix 'make sync' on debian and derivatives (Ryan Harper)
> - fix live migration (Uri Lublin, Izik Eidus)
> - initial ia64 userspace (Xiantao Zhang)
>
>
> Notes:
>       If you use the modules bundled with kvm-56, you can use any version
> of Linux from 2.6.9 upwards.
>       If you use the modules bundled with Linux 2.6.20, you need to use
> kvm-12.
>       If you use the modules bundled with Linux 2.6.21, you need to use
> kvm-17.
>       Modules from Linux 2.6.22 and up will work with any kvm version from
> kvm-22.  Some features may only be available in newer releases.
>       For best performance, use Linux 2.6.23-rc2 or later as the host.
>
> http://kvm.qumranet.com
>
>
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>   

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Re: [ANNOUNCE] kvm-56 release

[Alexey Eremenko]

[-- Attachment #1.1: Type: text/plain, Size: 426 bytes --]




-----Original Message-----
From: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org on behalf of Pelle
Sent: Thu 12/13/2007 6:19 AM
To: Avi Kivity
Cc: kvm-devel
Subject: Re: [kvm-devel] [ANNOUNCE] kvm-56 release
 
>I get the following error when modprobing the new module:

I hope you did rmmod first. You need to do:

rmmod kvm-intel
rmmod kvm
modprobe kvm-intel

-Alexey "Technologov"

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Re: [ANNOUNCE] kvm-56 release

[Avi Kivity]

[-- Attachment #1: Type: text/plain, Size: 391 bytes --]

Pelle wrote:
> I get the following error when modprobing the new module:
>
> WARNING: Error inserting kvm 
> (/lib/modules/2.6.22-14-generic/extra/kvm.ko): Unknown symbol in module, 
> or unknown parameter (see dmesg)
> kvm: Unknown symbol cmpxchg64
>
> Ubuntu 7.10 32-bits, C2D E6300
>
>   

Please try the attached patch.


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


[-- Attachment #2: cmpxchg64.patch --]
[-- Type: text/x-patch, Size: 979 bytes --]

diff --git a/kernel/external-module-compat.h b/kernel/external-module-compat.h
index ea94f30..b044cf9 100644
--- a/kernel/external-module-compat.h
+++ b/kernel/external-module-compat.h
@@ -322,6 +322,28 @@ static inline void __kvm_set_64bit(u64 *ptr, u64 val)
 #undef  set_64bit
 #define set_64bit __kvm_set_64bit
 
+static inline unsigned long long __kvm_cmpxchg64(volatile void *ptr,
+						 unsigned long long old,
+						 unsigned long long new)
+{
+	unsigned long long prev;
+	__asm__ __volatile__(LOCK_PREFIX "cmpxchg8b %3"
+			     : "=A"(prev)
+			     : "b"((unsigned long)new),
+			       "c"((unsigned long)(new >> 32)),
+			       "m"(*__xg(ptr)),
+			       "0"(old)
+			     : "memory");
+	return prev;
+}
+
+#define kvm_cmpxchg64(ptr,o,n)\
+	((__typeof__(*(ptr)))__kvm_cmpxchg64((ptr),(unsigned long long)(o),\
+					(unsigned long long)(n)))
+
+#undef cmpxchg64
+#define cpmxchg64(ptr, o, n) kvm_cmpxchg64(ptr, o, n)
+
 #endif
 
 #ifndef CONFIG_PREEMPT_NOTIFIERS

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Re: [ANNOUNCE] kvm-56 release

[Pelle]

Yes, unfortunately that's not it.


Alexey Eremenko wrote:
>
>
>
> -----Original Message-----
> From: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org on behalf of Pelle
> Sent: Thu 12/13/2007 6:19 AM
> To: Avi Kivity
> Cc: kvm-devel
> Subject: Re: [kvm-devel] [ANNOUNCE] kvm-56 release
>
> >I get the following error when modprobing the new module:
>
> I hope you did rmmod first. You need to do:
>
> rmmod kvm-intel
> rmmod kvm
> modprobe kvm-intel
>
> -Alexey "Technologov"
>
> ------------------------------------------------------------------------
>
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>   

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Re: [ANNOUNCE] kvm-56 release

[Alexey Eremenko]

[-- Attachment #1.1: Type: text/plain, Size: 133 bytes --]

Hi Pelle!

Yes, You're right, KVM-56 doesn't compiles on 32-bit systems. (tested on openSUSE 10.3, 32-bit)

-Alexey Technologov

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Re: [ANNOUNCE] kvm-56 release

[Avi Kivity]

Alexey Eremenko wrote:
>
> Hi Pelle!
>
> Yes, You're right, KVM-56 doesn't compiles on 32-bit systems. (tested 
> on openSUSE 10.3, 32-bit)
>

It compiles on 32-bit systems.   It doesn't compile on 32-bit non-pae 
systems.

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


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Re: [ANNOUNCE] kvm-56 release

[Farkas Levente]

Avi Kivity wrote:
> This restores live migration support which has been broken for a couple 
> of releases.  Also, if you had Java problems please test kvm-56, as it 
> has some nx related permission fixes.

unfortunately 32bit centos guest still not be able to boot on 64bit host.


-- 
  Levente                               "Si vis pacem para bellum!"

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Re: [ANNOUNCE] kvm-56 release

[Pelle]

Patch applied, rebuild (twice) but still the same error.

Avi Kivity wrote:
> Pelle wrote:
>> I get the following error when modprobing the new module:
>>
>> WARNING: Error inserting kvm 
>> (/lib/modules/2.6.22-14-generic/extra/kvm.ko): Unknown symbol in 
>> module, or unknown parameter (see dmesg)
>> kvm: Unknown symbol cmpxchg64
>>
>> Ubuntu 7.10 32-bits, C2D E6300
>>
>>   
>
> Please try the attached patch.
>
>
> ------------------------------------------------------------------------
>
> -------------------------------------------------------------------------
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Re: [ANNOUNCE] kvm-56 release

[Avi Kivity]

[-- Attachment #1: Type: text/plain, Size: 1383 bytes --]

Pelle wrote:
> Patch applied, rebuild (twice) but still the same error.
>

Sorry, there was a type in the patch.  Please change cpmxchg64 to 
cmpxchg64 in kernel/external-module-compat.h, or apply the attached 
corrected patch on a clean kvm-56.

> Avi Kivity wrote:
>> Pelle wrote:
>>> I get the following error when modprobing the new module:
>>>
>>> WARNING: Error inserting kvm 
>>> (/lib/modules/2.6.22-14-generic/extra/kvm.ko): Unknown symbol in 
>>> module, or unknown parameter (see dmesg)
>>> kvm: Unknown symbol cmpxchg64
>>>
>>> Ubuntu 7.10 32-bits, C2D E6300
>>>
>>>   
>>
>> Please try the attached patch.
>>
>>
>> ------------------------------------------------------------------------
>>
>> ------------------------------------------------------------------------- 
>>
>> SF.Net email is sponsored by:
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>>
>> ------------------------------------------------------------------------
>>
>> _______________________________________________
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>> kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
>> https://lists.sourceforge.net/lists/listinfo/kvm-devel


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


[-- Attachment #2: cmpxchg64.patch --]
[-- Type: text/x-patch, Size: 979 bytes --]

diff --git a/kernel/external-module-compat.h b/kernel/external-module-compat.h
index ea94f30..1dc5a96 100644
--- a/kernel/external-module-compat.h
+++ b/kernel/external-module-compat.h
@@ -322,6 +322,28 @@ static inline void __kvm_set_64bit(u64 *ptr, u64 val)
 #undef  set_64bit
 #define set_64bit __kvm_set_64bit
 
+static inline unsigned long long __kvm_cmpxchg64(volatile void *ptr,
+						 unsigned long long old,
+						 unsigned long long new)
+{
+	unsigned long long prev;
+	__asm__ __volatile__(LOCK_PREFIX "cmpxchg8b %3"
+			     : "=A"(prev)
+			     : "b"((unsigned long)new),
+			       "c"((unsigned long)(new >> 32)),
+			       "m"(*__xg(ptr)),
+			       "0"(old)
+			     : "memory");
+	return prev;
+}
+
+#define kvm_cmpxchg64(ptr,o,n)\
+	((__typeof__(*(ptr)))__kvm_cmpxchg64((ptr),(unsigned long long)(o),\
+					(unsigned long long)(n)))
+
+#undef cmpxchg64
+#define cmpxchg64(ptr, o, n) kvm_cmpxchg64(ptr, o, n)
+
 #endif
 
 #ifndef CONFIG_PREEMPT_NOTIFIERS

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Re: [ANNOUNCE] kvm-56 release

[Pelle]

Ah, check.

Thank you.


Avi Kivity wrote:
> Pelle wrote:
>> Patch applied, rebuild (twice) but still the same error.
>>
>
> Sorry, there was a type in the patch.  Please change cpmxchg64 to 
> cmpxchg64 in kernel/external-module-compat.h, or apply the attached 
> corrected patch on a clean kvm-56.
>
>> Avi Kivity wrote:
>>> Pelle wrote:
>>>> I get the following error when modprobing the new module:
>>>>
>>>> WARNING: Error inserting kvm 
>>>> (/lib/modules/2.6.22-14-generic/extra/kvm.ko): Unknown symbol in 
>>>> module, or unknown parameter (see dmesg)
>>>> kvm: Unknown symbol cmpxchg64
>>>>
>>>> Ubuntu 7.10 32-bits, C2D E6300
>>>>
>>>>   
>>>
>>> Please try the attached patch.
>>>
>>>
>>> ------------------------------------------------------------------------ 
>>>
>>>
>>> ------------------------------------------------------------------------- 
>>>
>>> SF.Net email is sponsored by:
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>>>
>>> ------------------------------------------------------------------------ 
>>>
>>>
>>> _______________________________________________
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>>> https://lists.sourceforge.net/lists/listinfo/kvm-devel
>
>

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Re: [ANNOUNCE] kvm-56 release

[Izik Eidus]

Farkas Levente wrote:
> Avi Kivity wrote:
>   
>> This restores live migration support which has been broken for a couple 
>> of releases.  Also, if you had Java problems please test kvm-56, as it 
>> has some nx related permission fixes.
>>     
>
> unfortunately 32bit centos guest still not be able to boot on 64bit host.
>
>
>   
Farkas, you cannot boot the guest with single cpu?
i am working now on a fix for the smp problem with RHEL 5 32bits, but it 
always
work for me when i try to boot it with single cpu (i tried it on servel 
computers)

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Re: [ANNOUNCE] kvm-56 release

[Theodore Tso]

On Thu, Dec 13, 2007 at 03:32:46PM +0200, Avi Kivity wrote:
> This restores live migration support which has been broken for a couple 
> of releases.  Also, if you had Java problems please test kvm-56, as it 
> has some nx related permission fixes.

BTW, there were changes between 2.6.24-rc3 and -rc5 such that there
are merge conflicts when I tried to do a git pull from kvm/master unto
Linus's git mainline.

						- Ted

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Re: [ANNOUNCE] kvm-56 release

[Farkas Levente]

Izik Eidus wrote:
> Farkas Levente wrote:
>> Avi Kivity wrote:
>>  
>>> This restores live migration support which has been broken for a
>>> couple of releases.  Also, if you had Java problems please test
>>> kvm-56, as it has some nx related permission fixes.
>>>     
>>
>> unfortunately 32bit centos guest still not be able to boot on 64bit host.
>>
>>
>>   
> Farkas, you cannot boot the guest with single cpu?
> i am working now on a fix for the smp problem with RHEL 5 32bits, but it
> always
> work for me when i try to boot it with single cpu (i tried it on servel
> computers)

sorry i forget to mention the boot only hangs with smp.

-- 
  Levente                               "Si vis pacem para bellum!"

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Re: [ANNOUNCE] kvm-56 release

[Avi Kivity]

Theodore Tso wrote:
> BTW, there were changes between 2.6.24-rc3 and -rc5 such that there
> are merge conflicts when I tried to do a git pull from kvm/master unto
> Linus's git mainline.
>
>   

In general I merge regularly and resolve conflicts. Currently kvm.git is 
based on 2.6.24-rc5.

-- 
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Re: [ANNOUNCE] kvm-56 release

[Carlo Marcelo Arenas Belon]

On Thu, Dec 13, 2007 at 06:59:06AM -0800, Alexey Eremenko wrote:
> 
>    Yes, You're right, KVM-56 doesn't compiles on 32-bit systems. (tested on
>    openSUSE 10.3, 32-bit)

it compiles ok in Gentoo 2007.0 building against the last stable gentoo
kernels 2.6.22 and 2.6.23 for x86 :

  gentoo-sources-2.6.22-r9
  gentoo-sources-2.6.23-r3

Carlo

PS. 2.6.22 is missing a declaration for cmpxchg64 as reported by Pele.

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Re: [ANNOUNCE] kvm-56 release

[Carlo Marcelo Arenas Belon]

On Thu, Dec 13, 2007 at 05:06:41PM +0200, Avi Kivity wrote:
> Alexey Eremenko wrote:
> >
> > Yes, You're right, KVM-56 doesn't compiles on 32-bit systems. (tested 
> > on openSUSE 10.3, 32-bit)
> >
> 
> It compiles on 32-bit systems.   It doesn't compile on 32-bit non-pae 
> systems.

gentoo non-pae kernels build ok as explained in previous post when using :

  CONFIG_NOHIGHMEM=y
  CONFIG_X86_PAE not set

enabling HIGHMEM64G and PAE also enables CONFIG_X86_CMPXCHG64=y

Carlo

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Re: [ANNOUNCE] kvm-56 release

[Izik Eidus]

On Thu, 2007-12-13 at 22:50 +0100, Farkas Levente wrote:
> Izik Eidus wrote:
> > Farkas Levente wrote:
> >> Avi Kivity wrote:
> >>  
> >>> This restores live migration support which has been broken for a
> >>> couple of releases.  Also, if you had Java problems please test
> >>> kvm-56, as it has some nx related permission fixes.
> >>>     
> >>
> >> unfortunately 32bit centos guest still not be able to boot on 64bit host.
> >>
> >>
> >>   
> > Farkas, you cannot boot the guest with single cpu?
> > i am working now on a fix for the smp problem with RHEL 5 32bits, but it
> > always
> > work for me when i try to boot it with single cpu (i tried it on servel
> > computers)
> 
> sorry i forget to mention the boot only hangs with smp.
> 
can you please try to convert the image to vmdk and run it with -smp 2
-no-kvm-irqchip and tell me what happen?


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Re: [ANNOUNCE] kvm-56 release

[Carlo Marcelo Arenas Belon]

On Thu, Dec 13, 2007 at 03:32:46PM +0200, Avi Kivity wrote:
> Notes:
>       If you use the modules bundled with kvm-56, you can use any version
> of Linux from 2.6.9 upwards.

the external module (once patched) will only be able to build against 2.6.17
upwards because the in-kernel PIC/IOAPIC/LAPIC requires hrtimers and that
functionality was only made public to external modules during the stabilization
of 2.6.17 as seen by :

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=8d16b76421f0b3216012ee2d7819355e1cb847e5

there are obviously 3 possible fixes :

1) rewrite the in-kernel PIC/IOAPIC/LAPIC not to use hrtimers (not worthy)
2) replicate the functionality needed in the compatibility header or with the
use of a helper (not that simple)
3) disable the functionality and ifdef the code for kernel < 2.6.17
(preferred)

but before, I would like to ask: is 2.6.9 upwards support really needed?, the
only reason why I would suspect that 2.6.9 was recommended was because of
RHEL4 but there is no kvm package available for it from Red Hat or in EPEL
and Full Support is due May 15, 2008 so there might not be one ever, specially
considering that Red Hat is focused on RHEL 5 Host for virtualization support
as can be seen by :

  http://www.redhat.com/rhel/virtualization/

other Linux distributions that are still under support will be affected as
well (mainly because they are corporate linux focused and with longer
supported timelines than community oriented distributions) but AFAIK they
don't have yet a kvm package (and might never had one) :

* Ubuntu Dapper 6.06.1 LTS (2.6.15)
* SuSE Linux 10.1 (2.6.16)
* Mandriva Corporate 4 (2.6.12)

of course ALL community oriented distributions (fedora, ubuntu, gentoo) which
are currently packaging kvm are ok and won't be affected by a "2.6.17 upwards"
requirement.

Carlo

PS. shouldn't the 2.6.9 or higher requirement be in this page?
http://kvm.qumranet.com/kvmwiki/Downloads

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Re: [ANNOUNCE] kvm-56 release

[Avi Kivity]

Carlo Marcelo Arenas Belon wrote:
> On Thu, Dec 13, 2007 at 03:32:46PM +0200, Avi Kivity wrote:
>   
>> Notes:
>>       If you use the modules bundled with kvm-56, you can use any version
>> of Linux from 2.6.9 upwards.
>>     
>
> the external module (once patched) will only be able to build against 2.6.17
> upwards because the in-kernel PIC/IOAPIC/LAPIC requires hrtimers and that
> functionality was only made public to external modules during the stabilization
> of 2.6.17 as seen by :
>
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=8d16b76421f0b3216012ee2d7819355e1cb847e5
>
> there are obviously 3 possible fixes :
>
> 1) rewrite the in-kernel PIC/IOAPIC/LAPIC not to use hrtimers (not worthy)
> 2) replicate the functionality needed in the compatibility header or with the
> use of a helper (not that simple)
> 3) disable the functionality and ifdef the code for kernel < 2.6.17
> (preferred)
>
> but before, I would like to ask: is 2.6.9 upwards support really needed?, 

I imagine you're right, since there are few complaints.  Most people 
have migrated to RHEL 5 or its equivalents.

> the
> only reason why I would suspect that 2.6.9 was recommended was because of
> RHEL4

Yes.

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


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