On 09/16/2015 08:32 PM, Shannon Zhao wrote:

Hi Wei,

On 2015/9/17 5:07, Wei Huang wrote:

quoted

I am testing this series. 

Thanks for your time and help.

quoted

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.

quoted

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