linux-kernel - Re: [PATCH] KVM: x86: Provide a capability to disable APERF/MPERF read intercepts

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Message-ID: <f10cef8c-107f-4eb6-87bc-3d704f663c3e@redhat.com>
Date: Fri, 14 Mar 2025 16:34:48 +0100
From: Paolo Bonzini <pbonzini@...hat.com>
To: Jim Mattson <jmattson@...gle.com>
Cc: Sean Christopherson <seanjc@...gle.com>, linux-kernel@...r.kernel.org,
 kvm@...r.kernel.org
Subject: Re: [PATCH] KVM: x86: Provide a capability to disable APERF/MPERF
 read intercepts

On 3/14/25 16:33, Jim Mattson wrote:
>> It would be simpler for userspace to be able to say "if the bit is there
>> then enable it and make it visible through CPUID".
> Good point. I'll take care of that in v2.
> 
> I feel like I am abandoning my principles with this patch, but as long
> as you and Sean are on-board, I will do what needs to be done.

True, but there's a time for that as well.  As long as it's not enabled 
by default, stuff like this (or even quirks that _are_ enabled by 
default) has its place.

Paolo