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Re: [Qemu-devel] [RFC 09/14] Implement remaining PMU functionality
From: |
Christopher Covington |
Subject: |
Re: [Qemu-devel] [RFC 09/14] Implement remaining PMU functionality |
Date: |
Tue, 2 Feb 2016 18:01:23 -0500 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:43.0) Gecko/20100101 Thunderbird/43.0 |
Hi Alistair,
On 02/02/2016 04:22 PM, Alistair Francis wrote:
> On Wed, Aug 5, 2015 at 9:51 AM, Christopher Covington
> <address@hidden> wrote:
>> This adds logic to increment PMEVCNTR's based on different event inputs,
>> implements all remaining CP registers, and triggers an interrupt on
>> event overflow.
>
> We (Xilinx) need parts of this patch to avoid kernel panics when
> booting the 4.4 Linux kernel. Have you done any more work on it? If
> you can send out a pach set I'm happy to have a look at it.
This issue sounds related to Lorenzo Piersali's patch arm64: kernel: fix
PMUv3 registers unconditional access.
As for the status of our TCG PMU patches, unfortunately, last I recall,
I was writing some kvm-unit-tests that Drew wanted me to test against
the KVM PMU, which required real hardware. I got distracted with using
an upstream kernel and a certain distribution on the hardware and have
yet to return.
Cov
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