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

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Message-ID: <20200911084613.GA562@jagdpanzerIV.localdomain>
Date:   Fri, 11 Sep 2020 17:46:13 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     yezengruan <yezengruan@...wei.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        "will@...nel.org" <will@...nel.org>,
        "maz@...nel.org" <maz@...nel.org>, joelaf@...gle.com,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        suleiman@...gle.com,
        "kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
        "linux-arm-kernel@...ts.infradead.org" 
        <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

Hi,

On (20/08/17 20:03), yezengruan wrote:
> Hi Sergey,
> 
> I have a set of patches similar to yours.
> 
> https://lore.kernel.org/lkml/20191226135833.1052-1-yezengruan@huawei.com/

I'm sorry for the belated reply.

Right, quite similar, but not exactly, I believe. I deliberately wanted
to untangle vcpu preemption (which is a characteristics feature) from
pv-lock, which may be somewhat implementation dependent.

Perhaps vcpu_is_preempted() should not even be implemented on per-arch
basis, but instead it can be more of a "core" functionality.

	-ss