linux-kernel - Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT

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Message-ID: <20170925162040.GP26248@char.us.oracle.com>
Date:   Mon, 25 Sep 2017 12:20:40 -0400
From:   Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:     Marcelo Tosatti <mtosatti@...hat.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>, mingo@...hat.com,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO
 hypercall

> I think you are missing the following point:
> 
> "vcpu0 can be interrupted when its not in a spinlock protected section, 
> otherwise it can't."
> 
> So you _have_ to communicate to the host when the guest enters/leaves a
> critical section.


How would this work for Windows or FreeBSD?