Re: [PATCH v9] arm/kvm: Enable support for KVM_ARM_VCPU_PMU_V3_FILTER

["Daniel P. Berrangé" <berrange@redhat.com>]

On Mon, Apr 08, 2024 at 10:49:40PM -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'm still against implementing this one-off custom parsed syntax
for kvm-pmu-filter values. Once this syntax exists, we're locked
into back-compatibility for multiple releases, and it will make
a conversion to QAPI/JSON harder.

With regards,
Daniel
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