On 09/16/2015 08:32 PM, Shannon Zhao wrote:
> Hi Wei,
>
> On 2015/9/17 5:07, Wei Huang wrote:
>> I am testing this series.
> Thanks for your time and help.
>
>> The first question is: do you plan to add ACPI
>> support in QEMU?
I saw "KVM_{SET/GET}_DEVICE_ATTR failed: Invalid argument" while using
your QEMU tree (PMU_v2 branch). A quick debugging:
(1) dmesg on host kernel didn't show any vPMU initialization errors. So
I suspect the problem is related to QEMU.
(2) Commit 58771bc2a78 worked fine. So probably the problem was
introduced by new PMU code.
Have you seen it before?
Thanks,
-Wei
> To the completeness, this should be added. Maybe this could be added at
> v3. But I have a look at the kernel PMU driver, it doesn't support
> probing through ACPI, although there are some patches[1] out-of-tree.
>
>> My in-house kernel uses ACPI for device probing. I had
>> to force "acpi=off" when I test this patch series.
> Guest kernel only boots with ACPI when you add "acpi=force". No need to
> add "acpi=off".
>
> Thanks,
>
> [1] http://marc.info/?l=linaro-acpi&m=137949337925645&w=2
>
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