linux-kernel - Re: [RFC PATCH 0/2] KVM: x86: guest exit microoptimization

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Message-ID: <7399af63-a751-a2dd-d8a4-77aee0bf5996@redhat.com>
Date:	Fri, 1 Jul 2016 18:45:14 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:	bsd@...hat.com, rkrcmar@...hat.com
Subject: Re: [RFC PATCH 0/2] KVM: x86: guest exit microoptimization



On 16/06/2016 10:21, Paolo Bonzini wrote:
> This saves about 20 clock cycles per vmexit by avoiding a
> local_irq_save/restore pair.  The price is that nested VMX will break
> with KVM hosts < 3.16, because the "acknowledge interrupt on exit"
> feature becomes mandatory.  What do you think?

I'm pushing these patches.

Paolo