On Sun, Jul 15, 2007 at 09:23:31AM +0300, Avi Kivity wrote:
> Can you bisect kvm to find the offending commit? Basically, you do a
>
> git clone git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm.git
> cd kvm
> git bisect start drivers/kvm/
> bit bisect bad kvm-29
> git bisect good kvm-28
>
> git will check out a test candidate; go to your kvm userspace directory
> and do
>
> make -C kernel sync LINUX=/path/to/the/kvm/git/directory
> make -C kernel
> sudo make -C kernel install
>
> reload the module, test, and issue 'git bisect good' or 'git bisect bad'
> according to the result. As there are only 25 commits you should be
> done in 5 cycles.
>
And the result is:
commit ba9c20c048726037664d303362b688759fdf6e9d
Author: Luca Tettamanti <[EMAIL PROTECTED]>
Date: Tue Jun 19 22:41:20 2007 +0200
KVM: Fix x86 emulator writeback
When the old value and new one are the same the emulator skips the
write; this is undesirable when the destination is a MMIO area and the
write shall be performed regardless of the previous value. This
optimization breaks e.g. a Linux guest APIC compiled without
X86_GOOD_APIC.
Remove the check and perform the writeback stage in the emulation unless
it's explicitly disabled (currently push and some 2 bytes instructions
may disable the writeback).
Signed-Off-By: Luca Tettamanti <[EMAIL PROTECTED]>
Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
I have tried to revert this patch directly into kvm-29, and it also
fixes the problem.
--
.''`. Aurelien Jarno | GPG: 1024D/F1BCDB73
: :' : Debian developer | Electrical Engineer
`. `' [EMAIL PROTECTED] | [EMAIL PROTECTED]
`- people.debian.org/~aurel32 | www.aurel32.net
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