[ANNOUNCE] kvm-77 release

[ANNOUNCE] kvm-77 release

[Avi Kivity]

This release fixes the -std-vga regression which bothered those of us 
who have large or widescreen monitors (note the option is now named 
'-vga std' due to upstream qemu changes).  Other significant changes 
include better disk performance if you have a fast host storage subsystem.

Changes from kvm-76:
- merge bochs-bios-cvs
- merge qemu-svn
   - more -cpu options
   - faster disk emulation (esp. with scsi/virtio)
- improved NMI support (Jan Kiszka)
- improve >4GB memory support (Alex Williamson)
- memory alias cleanups (Glauber Costa)
- fix kvmtrace segfault (Ryota OZAKI)
- make external module compile on split source/object configs (Alexander 
Graf)
   - allows compiling on opensuse
- fix -std-vga regression
- fix migration failure at end of migration protocol
- map mmio pages for device assignment (Weidong Han)
- silence lapic kernel messages (Jan Kiszka)
- fix vcpu reset (Gleb Natapov)
- fix missed invlpg on EPT-enabled machines with EPT disabled (Marcelo 
Tosatti)
- device assignment on ia64 (Xiantao Zhang)
- memory type support on EPT (Sheng Yang)


Notes:
     If you use the modules bundled with kvm-77, you can use any version
of Linux from 2.6.16 upwards.  You may also use kvm-77 userspace with
the kvm modules provided by Linux 2.6.25 or above.  Some features may
only be available in newer releases.

http://kvm.qumranet.com


-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

Re: [ANNOUNCE] kvm-77 release

[Don Parsons]

Avi Kivity <avi <at> redhat.com> writes:
 
> This release fixes the -std-vga regression which bothered those of us 
> who have large or widescreen monitors (note the option is now named 
> '-vga std' due to upstream qemu changes).  Other significant changes 
> include better disk performance if you have a fast host storage subsystem.

kvm-75 worked well.  Now both 76 and 77 fail to boot.  76 gave no
hint and a Google check showed it to be blamed on CONFIG_KVM_GUEST
option in the linux kernel  .config.

Host is Fedora 8 with kernel-2.6.26.5-28.fc8.x86_64
Guest is Fedora 9 with kernel-2.6.26.5-45.fc9.i686
Hardware is Asus P5B Deluxe, Core 2 E6600 with 
  flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
         pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
         syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni
         monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm

Trying to boot with kvm-77 gave a debugging hint, so here is
what I get.  Does not look informative to me though.  This was
typed from screen (Can copy paste work?):

Startup script:
modprobe kvm-intel; sleep 1
/usr/local/kvm/bin/qemu-system-x86_64 vdisk_fedora9.img -m 2048 -no-quit &
        ====================
[First boot:]

Booting 'Fedora (2.6.26.5-45.fc9.i686)'
:
Booting the kernel.
..MP-BIOS bug: 8254 timer not connected to IO-APIC
Kernel panic - not syncing: IO-APIC + timer doesn't work!  Boot with
  apic=debug and send a report.  Then try booting with the 'noapic'
  option
        ====================
[Second boot (apic=debug):]

Booting 'Fedora (2.6.26.5-45.fc9.i686)'
:
Booting the kernel.
pci 0000:00:01.0: PIIX3: Enabling Passive Release
Red Hat nash version 6.0.52 starting
  Reading all physical volumes.  This may take a while...
  Found volume group "VolGroup00" using metadata type lvm2
    2 logical volume(s) in volume group "VolGroup00" now active
(hung here at 99%)
        ====================
[Third boot (noapic):]

Booting 'Fedora (2.6.26.5-45.fc9.i686)'
:
Booting the kernel.

(identical to second boot and 
 hangs as in 2nd case with 100% in "CPU qemu-system-x86")
        ====================

Hope this helps.

Don

APIC problems with kvm-77 (was Re: [ANNOUNCE] kvm-77 release)

[Carlo Marcelo Arenas Belon]

On Sun, Oct 12, 2008 at 06:18:29PM +0000, Don Parsons wrote:
> 
> Trying to boot with kvm-77 gave a debugging hint, so here is
> what I get.  Does not look informative to me though.  This was
> typed from screen (Can copy paste work?):
> 
> Startup script:
> modprobe kvm-intel; sleep 1
> /usr/local/kvm/bin/qemu-system-x86_64 vdisk_fedora9.img -m 2048 -no-quit &
>         ====================
> [First boot:]
> 
> Booting 'Fedora (2.6.26.5-45.fc9.i686)'
> :
> Booting the kernel.
> ..MP-BIOS bug: 8254 timer not connected to IO-APIC
> Kernel panic - not syncing: IO-APIC + timer doesn't work!  Boot with
>   apic=debug and send a report.  Then try booting with the 'noapic'
>   option
>         ====================

this points to BOCHS BIOS bug, as a workaround you should be able to use the
bios.bin file from the old kvm-75 version instead.

Carlo

Re: APIC problems with kvm-77 (was Re: [ANNOUNCE] kvm-77 release)

[Sheng Yang]

On Fri, Oct 17, 2008 at 10:08:48AM -0500, Carlo Marcelo Arenas Belon wrote:
> On Sun, Oct 12, 2008 at 06:18:29PM +0000, Don Parsons wrote:
> > 
> > Trying to boot with kvm-77 gave a debugging hint, so here is
> > what I get.  Does not look informative to me though.  This was
> > typed from screen (Can copy paste work?):
> > 
> > Startup script:
> > modprobe kvm-intel; sleep 1
> > /usr/local/kvm/bin/qemu-system-x86_64 vdisk_fedora9.img -m 2048 -no-quit &
> >         ====================
> > [First boot:]
> > 
> > Booting 'Fedora (2.6.26.5-45.fc9.i686)'
> > :
> > Booting the kernel.
> > ..MP-BIOS bug: 8254 timer not connected to IO-APIC
> > Kernel panic - not syncing: IO-APIC + timer doesn't work!  Boot with
> >   apic=debug and send a report.  Then try booting with the 'noapic'
> >   option
> >         ====================
> 
> this points to BOCHS BIOS bug, as a workaround you should be able to use the
> bios.bin file from the old kvm-75 version instead.

Hi Carlo

Is that a BIOS bug filled/raised for this? It seems like IOAPIC didn't receive
pit interrupt in time to me.

Don, so does it happen everytime? And please show your computer environment
as well.

--
regards
Yang, Sheng

> 
> Carlo
> --
> To unsubscribe from this list: send the line "unsubscribe kvm" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: APIC problems with kvm-77 (was Re: [ANNOUNCE] kvm-77 release) SOLVED

[Donald Parsons]

On Sat, 2008-10-18 at 01:15 +0800, Sheng Yang wrote: 
> On Fri, Oct 17, 2008 at 10:08:48AM -0500, Carlo Marcelo Arenas Belon wrote:
> > On Sun, Oct 12, 2008 at 06:18:29PM +0000, Don Parsons wrote:
> > > 
> > > Trying to boot with kvm-77 gave a debugging hint, so here is
> > > what I get.  Does not look informative to me though.  This was
> > > typed from screen (Can copy paste work?):
> > > 
> > > Startup script:
> > > modprobe kvm-intel; sleep 1
> > > /usr/local/kvm/bin/qemu-system-x86_64 vdisk_fedora9.img -m 2048 -no-quit &
> > >         ====================
> > > [First boot:]
> > > 
> > > Booting 'Fedora (2.6.26.5-45.fc9.i686)'
> > > :
> > > Booting the kernel.
> > > ..MP-BIOS bug: 8254 timer not connected to IO-APIC
> > > Kernel panic - not syncing: IO-APIC + timer doesn't work!  Boot with
> > >   apic=debug and send a report.  Then try booting with the 'noapic'
> > >   option
> > >         ====================
> > 
> > this points to BOCHS BIOS bug, as a workaround you should be able to use the
> > bios.bin file from the old kvm-75 version instead.

I tried using the bios.bin from kvm-75 but it still fails.   Not
sure if extboot.bin might need matching bios.bin, so I copied it
over too.  But still fails.  I just checked, extboot.bin's are
identical so that was a no-op.

As another check I went back to a complete kvm-75 replacement
and found it now no longer works.  One or two weeks ago it did.

I also see that I only have
  vmlinuz-2.6.26.3-14.fc8
  vmlinuz-2.6.26.5-28.fc8  both with  CONFIG_KVM_GUEST=y
and no vmlinuz-2.6.25 

Does kvm-77 still have the CONFIG_KVM_GUEST=y  problem?  I suppose it
does, since changelog does not mention it.

I am now very confused.  It might be that I only verified that kvm-76
worked with kernel-2.6.25.14-69.fc8.x86_64 (which I no longer have).

I thought I verified kvm-75 with vmlinuz-2.6.26.5-28.fc8.x86_64 but
now I am no sure.  (My post got stuck waiting for Gmane autoauthorizer
in my ISP's spam filter until I found it today).


> Hi Carlo
> 
> Is that a BIOS bug filled/raised for this? It seems like IOAPIC didn't receive
> pit interrupt in time to me.
> 
> Don, so does it happen everytime? And please show your computer environment
> as well.

No, the boots are not consistent.  Since it has failed to boot, it has
always failed to boot.  The text printed to screen it not always the
same.  Last Sunday when I originally wrote first email, I tried more
boots and noticed one out of 4 had slightly different output.

Today one out of several boots (with kvm-75 bios) showed it getting
past above hangs, and trying to access disk but here it failed
saying non-existent file(s), so it could not proceed.

Also the "MP-BIOS bug: 8254 timer not connected to IO-APIC" only 
occurred that one time out of about 12 attempted boots.


I tried this patch from another thread
  http://article.gmane.org/gmane.comp.emulators.kvm.devel/23044

which for 2.6.26.6 becomes

--- arch/x86/kvm/mmu.c~ 2008-10-17 15:51:19.000000000 -0400
+++ arch/x86/kvm/mmu.c  2008-10-17 15:52:42.000000000 -0400
@@ -2106,6 +2106,7 @@
static int kvm_pv_mmu_flush_tlb(struct kvm_vcpu *vcpu)
{
        kvm_x86_ops->tlb_flush(vcpu);
+       set_bit(KVM_REQ_MMU_SYNC, &vcpu->requests);
        return 1;
}

but it fails to compile with:
  CC [M]  arch/x86/kvm/mmu.o
arch/x86/kvm/mmu.c: In function ‘kvm_pv_mmu_flush_tlb’:
arch/x86/kvm/mmu.c:2109: error: ‘KVM_REQ_MMU_SYNC’ undeclared (first use
in this function)
arch/x86/kvm/mmu.c:2109: error: (Each undeclared identifier is reported
only once
arch/x86/kvm/mmu.c:2109: error: for each function it appears in.)
make[1]: *** [arch/x86/kvm/mmu.o] Error 1
make: *** [arch/x86/kvm] Error 2

Apparently a 2.6.27 only patch.  Oops, no it is not.  I figured out
that the patch "path" actually refers to     ./arch/x86/mmu.c
in a kvm-77 tree.

With this patch above applied to kvm-77 release results in my Fedora 8
guest booting and running properly.  i.e., the patch:

--- kernel/x86/mmu.c~   2008-10-12 07:53:12.000000000 -0400
+++ kernel/x86/mmu.c    2008-10-17 17:47:46.000000000 -0400
@@ -2747,6 +2747,7 @@
 static int kvm_pv_mmu_flush_tlb(struct kvm_vcpu *vcpu)
 {
        kvm_x86_ops->tlb_flush(vcpu);
+       set_bit(KVM_REQ_MMU_SYNC, &vcpu->requests);
        return 1;
 }


So it appears that the SOLUTION for 2.6.26 or 2.6.27 is to apply above
patch or wait for kvm-78.tgz

Thanks to everyone who tried to help me.

Don

Re: [ANNOUNCE] kvm-77 release

[Henrik Holst]

sön 2008-10-12 klockan 14:02 +0200 skrev Avi Kivity:
> This release fixes the -std-vga regression which bothered those of us 
> who have large or widescreen monitors (note the option is now named 
> '-vga std' due to upstream qemu changes).  Other significant changes 
> include better disk performance if you have a fast host storage subsystem.
> 
> Changes from kvm-76:
> - merge bochs-bios-cvs
> - merge qemu-svn
>    - more -cpu options
>    - faster disk emulation (esp. with scsi/virtio)
> - improved NMI support (Jan Kiszka)
> - improve >4GB memory support (Alex Williamson)
> - memory alias cleanups (Glauber Costa)
> - fix kvmtrace segfault (Ryota OZAKI)
> - make external module compile on split source/object configs (Alexander 
> Graf)
>    - allows compiling on opensuse
> - fix -std-vga regression
> - fix migration failure at end of migration protocol
> - map mmio pages for device assignment (Weidong Han)
> - silence lapic kernel messages (Jan Kiszka)
> - fix vcpu reset (Gleb Natapov)
> - fix missed invlpg on EPT-enabled machines with EPT disabled (Marcelo 
> Tosatti)
> - device assignment on ia64 (Xiantao Zhang)
> - memory type support on EPT (Sheng Yang)
> 
> 
> Notes:
>      If you use the modules bundled with kvm-77, you can use any version
> of Linux from 2.6.16 upwards.  You may also use kvm-77 userspace with
> the kvm modules provided by Linux 2.6.25 or above.  Some features may
> only be available in newer releases.
> 
> http://kvm.qumranet.com
> 
> 

We have encountered a regression with kvm-77 here, we previously ran
kvm-74 so I am not yet sure if this regression was introduced in 77 or
76,75 (I will try and test these versions asap).

Ubuntu-8.10-server-amd64 cannot find the drive (tested with ide, scsi and virtio). Log on the guest screen:

*** glibc detected *** modprobe: realloc(): invalid next size: 0x0000000000f95cb0 ***
Aborted
*** glibc detected *** modprobe: realloc(): invalid next size: 0x0000000001247cb0 ***
Aborted
*** glibc detected *** modprobe: realloc(): invalid next size: 0x00000000025a8cb0 ***
Aborted
*** glibc detected *** modprobe: realloc(): invalid next size: 0x0000000001529cb0 ***
Aborted
*** glibc detected *** modprobe: realloc(): invalid next size: 0x0000000001276cb0 ***
Aborted
*** glibc detected *** modprobe: realloc(): invalid next size: 0x0000000001bf1cb0 ***
Aborted
udevd[915]: add_to_rules: invalid rule '/etc/udev/rules.d/05-options.rules:1'
udevd[915]: add_to_rules: invalid rule '/etc/udev/rules.d/05-options.rules:2'
udevd[915]: add_to_rules: invalid rule '/etc/udev/rules.d/05-options.rules:3'
udevd[915]: add_to_rules: invalid rule '/etc/udev/rules.d/05-options.rules:4'

and on and on, ending with the system complaning that it cannot find the
drive with the old UUID value. Booting the very same image on kvm-74
produced none of these errors what so ever.

If giving the guest more than 2GiB of memory there is a stream of
"segmentation fault" lines, probably from modprobe

Ubuntu-8.04 boots just fine under kvm-77 so it feels like a mismatch
with the guest 2.6.27 kernel. Tested both 2.27-4 and 2.27-7 to no avail.

The host is Debian Lenny with a 2.6.26-1-amd64 kernel and a Q6600 with
8GB RAM

/Henrik Holst
Witsbits AB

Re: [ANNOUNCE] kvm-77 release

[Henrik Holst]

mån 2008-10-13 klockan 11:33 +0200 skrev Henrik Holst:
> "segmentation fault" lines, probably from modprobe
> 
> Ubuntu-8.04 boots just fine under kvm-77 so it feels like a mismatch
> with the guest 2.6.27 kernel. Tested both 2.27-4 and 2.27-7 to no avail.

Encountered the very same problem on a Debian Lenny guest (2.6.26
kernel) but not on a Debian Sid or Ubuntu 8.04 (2.6.24) so much for the
2.6.27 idea...

Re: [ANNOUNCE] kvm-77 release

[Henrik Holst]

mån 2008-10-13 klockan 11:44 +0200 skrev Henrik Holst:
> mån 2008-10-13 klockan 11:33 +0200 skrev Henrik Holst:
> > "segmentation fault" lines, probably from modprobe
> > 
> > Ubuntu-8.04 boots just fine under kvm-77 so it feels like a mismatch
> > with the guest 2.6.27 kernel. Tested both 2.27-4 and 2.27-7 to no avail.
> 
> Encountered the very same problem on a Debian Lenny guest (2.6.26
> kernel) but not on a Debian Sid or Ubuntu 8.04 (2.6.24) so much for the
> 2.6.27 idea...
> 
And if I had bothered to look more deeply into the mailinglist archive I
would have found this patch from Marcelo that cures this very problem:

KVM: MMU: sync root on paravirt TLB flus

So now everything works flawlessly on kvm-77, many thanks for the new
release!

/Henrik Holst
Witsbits AB