linux-kernel - Re: [RFC PATCH v1 0/2] Avoid rcu_core() if CPU just left guest vcpu

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Date: Wed, 8 May 2024 07:01:29 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Leonardo Bras <leobras@...hat.com>
Cc: "Paul E. McKenney" <paulmck@...nel.org>, Paolo Bonzini <pbonzini@...hat.com>, 
	Frederic Weisbecker <frederic@...nel.org>, Neeraj Upadhyay <quic_neeraju@...cinc.com>, 
	Joel Fernandes <joel@...lfernandes.org>, Josh Triplett <josh@...htriplett.org>, 
	Boqun Feng <boqun.feng@...il.com>, Steven Rostedt <rostedt@...dmis.org>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Lai Jiangshan <jiangshanlai@...il.com>, 
	Zqiang <qiang.zhang1211@...il.com>, Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, rcu@...r.kernel.org
Subject: Re: [RFC PATCH v1 0/2] Avoid rcu_core() if CPU just left guest vcpu

On Wed, May 08, 2024, Leonardo Bras wrote:
> Something just hit me, and maybe I need to propose something more generic.

Yes.  This is what I was trying to get across with my complaints about keying off
of the last VM-Exit time.  It's effectively a broad stroke "this task will likely
be quiescent soon" and so the core concept/functionality belongs in common code,
not KVM.