linux-kernel - Re: [RFC][PATCH 0/4] arm64:kvm: teach guest sched that VCPUs can be preempted

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Message-ID: <20200911085841.GB562@jagdpanzerIV.localdomain>
Date:   Fri, 11 Sep 2020 17:58:41 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     yezengruan <yezengruan@...wei.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        will@...nel.org, joelaf@...gle.com, linux-kernel@...r.kernel.org,
        suleiman@...gle.com, kvmarm@...ts.cs.columbia.edu,
        linux-arm-kernel@...ts.infradead.org,
        "Wanghaibin (D)" <wanghaibin.wang@...wei.com>
Subject: Re: [RFC][PATCH 0/4] arm64:kvm: teach guest sched that VCPUs can be
 preempted

My apologies for the slow reply.

On (20/08/17 13:25), Marc Zyngier wrote:
>
> It really isn't the same thing at all. You are exposing PV spinlocks,
> while Sergey exposes preemption to vcpus.
>

Correct, we see vcpu preemption as a "fundamental" feature, with
consequences that affect scheduling, which is a core feature :)

Marc, is there anything in particular that you dislike about this RFC
patch set? Joel has some ideas, which we may discuss offline if that
works for you.

	-ss