Re: Unable to boot guest on kernel 2.6.29.1 with kvm-84 or kvm-85

Avi Kivity
2009-05-03T10:14:29Z

Avi Kivity wrote:
> Kenni Lund wrote:
>> Avi Kivity avi@redhat.com wrote:
>>
>>> Kenni Lund wrote:
>>>
>>>> Ok, but as I write in my message, I'm using the
>>>>
>>> KVM modules from the latest> upstream kernel, not the kvm-85
>>> modules.>
>>>
>>>> According to the KVM download page,
>>>> http://www.linux-kvm.org/page/Downloads,> any kernel above 2.6.25
>>>> should work with the
>>>>
>>> latest KVM userspace. This has> been true until now in my case, but
>>> it breaks
>>> with 2.6.29.1 and that's the reason> why I'm posting this bug report.
>>>
>>>>
>>> Can you try a bisect?
>>>
>>
>> Yes, sorry for the late reply. I did the bisect as requested and it
>> returned the following results:
>>
>> # bad: [8d7bff2d72660d9d60aa371ae3d1356bbf329a09] Linux 2.6.29.1
>> # good: [4a6908a3a050aacc9c3a2f36b276b46c0629ad91] Linux 2.6.28 git
>> bisect start 'v2.6.29.1' 'v2.6.28' '--' 'arch/x86/kvm' 'virt/kvm'
>> # good: [b82091824ee4970adf92d5cd6d57b12273171625] KVM: Prevent trace
>> call into unloaded module text
>> git bisect good
>> b82091824ee4970adf92d5cd6d57b12273171625
>> # good: [7f59f492da722eb3551bbe1f8f4450a21896f05d] KVM: use
>> cpumask_var_t for cpus_hardware_enabled git bisect good
>> 7f59f492da722eb3551bbe1f8f4450a21896f05d
>> # good: [19de40a8472fa64693eab844911eec277d489f6c] KVM: change KVM to
>> use IOMMU API git bisect good
>> 19de40a8472fa64693eab844911eec277d489f6c
>> # good: [2aaf69dcee864f4fb6402638dd2f263324ac839f] KVM: MMU: Map
>> device MMIO as UC in EPT
>> git bisect good 2aaf69dcee864f4fb6402638dd2f263324ac839f
>> # good: [682edb4c01e690c7c7cd772dbd6f4e0fd74dc572] KVM: Fix assigned
>> devices circular locking dependency
>> git bisect good 682edb4c01e690c7c7cd772dbd6f4e0fd74dc572
>> # bad: [f438349efb8247cd0c1d453a4131b1f801bf5691] KVM: VMX: Don't
>> allow uninhibited access to EFER on i386
>> git bisect bad f438349efb8247cd0c1d453a4131b1f801bf5691
>> # good: [516a1a7e9dc80358030fe01aabb3bedf882db9e2] KVM: VMX: Flush
>> volatile msrs before emulating rdmsr
>> git bisect good 516a1a7e9dc80358030fe01aabb3bedf882db9e2
>>
>> ----------------
>> And the final output:
>>
>> f438349efb8247cd0c1d453a4131b1f801bf5691 is first bad commit
>> commit f438349efb8247cd0c1d453a4131b1f801bf5691
>> Author: Avi Kivity Date: Thu Mar 26 23:05:03 2009 +0000
>>
>> KVM: VMX: Don't allow uninhibited access to EFER on i386
>>
>> upstream commit: 16175a796d061833aacfbd9672235f2d2725df65
>>
>> vmx_set_msr() does not allow i386 guests to touch EFER, but they
>> can still
>> do so through the default: label in the switch. If they set
>> EFER_LME, they
>> can oops the host.
>>
>> Fix by having EFER access through the normal channel (which will
>> check for
>> EFER_LME) even on i386.
>>
>> Reported-and-tested-by: Benjamin Gilbert Cc: stable@kernel.org
>> Signed-off-by: Avi Kivity Signed-off-by: Chris Wright
>> :040000 040000 cf7848d35c136beee6665e67839080d450977af0
>> 0a39980481dd346306b2ac54dbe916741515f1f1 M arch
>>
>> ----------------
>>
>> FYI, I also tested 2.6.29.2 and the issue still exists.
>>
>> Do you need more information?
>>
>>
>
> Please try the attached patch.
>

It won't help - I reproduced the issue. Instead, try passing the
parameter '-cpu qemu32' (or '-cpu qemu64,-nx').

--
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