linux-kernel - Re: [PATCH v7 00/22] Support SDEI Virtualization

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Date:   Thu, 7 Jul 2022 17:08:35 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Marc Zyngier <maz@...nel.org>, Gavin Shan <gshan@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>, will@...nel.org,
        linux-kernel@...r.kernel.org, eauger@...hat.com,
        shan.gavin@...il.com, Jonathan.Cameron@...wei.com,
        vkuznets@...hat.com, shijie@...eremail.onmicrosoft.com,
        kvmarm@...ts.cs.columbia.edu, Peter Feiner <pfeiner@...gle.com>
Subject: Re: [PATCH v7 00/22] Support SDEI Virtualization

On Tue, Jul 05, 2022, Paolo Bonzini wrote:
> That said: Peter, Sean, Google uses or used postcopy extensively on GCE
> (https://dl.acm.org/doi/pdf/10.1145/3296975.3186415).  If it doesn't use it
> on x86, do you have any insights on why?

We still use postcopy, but we don't use async #PF.  Async #PF is disabled (mostly?)
because the x86 implementation was such a mess prior to switching to IRQ-based
delivery and AFAIK we haven't re-evaluated it since that update.