Re: [PATCH v8] arm/kvm: Enable support for KVM_ARM_VCPU_PMU_V3_FILTER

[Shaoqin Huang <shahuang@redhat.com>]

Hi Daniel,

Thanks for your reviewing. I see your comments in the v7.

I have some doubts about what you said about the QAPI. Do you want me to 
convert the current design into the QAPI parsing like the 
IOThreadVirtQueueMapping? And we need to add new json definition in the 
qapi/ directory?

Thanks,
Shaoqin

On 3/22/24 22:53, Daniel P. Berrangé wrote:
> On Tue, Mar 12, 2024 at 03:48:49AM -0400, Shaoqin Huang wrote:
>> The KVM_ARM_VCPU_PMU_V3_FILTER provides the ability to let the VMM decide
>> which PMU events are provided to the guest. Add a new option
>> `kvm-pmu-filter` as -cpu sub-option to set the PMU Event Filtering.
>> Without the filter, all PMU events are exposed from host to guest by
>> default. The usage of the new sub-option can be found from the updated
>> document (docs/system/arm/cpu-features.rst).
>>
>> Here is an example which shows how to use the PMU Event Filtering, when
>> we launch a guest by use kvm, add such command line:
>>
>>    # qemu-system-aarch64 \
>>          -accel kvm \
>>          -cpu host,kvm-pmu-filter="D:0x11-0x11"
> 
> I mistakenly sent some comments to the older v7 (despite this v8 already
> existing) about the design of this syntax So for linking up the threads:
> 
>   https://lists.nongnu.org/archive/html/qemu-devel/2024-03/msg04703.html
> 
> With regards,
> Daniel

-- 
Shaoqin