Re: [ANNOUNCE] kvm-77 release

[Henrik Holst <henrik@witsbits.com>]

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