Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Sat, 22 May 2021 02:31:25 +0900
From:   Keith Busch <kbusch@kernel.org>
To:     "Verma, Vishal L" <vishal.l.verma@intel.com>
Cc:     "hch@lst.de" <hch@lst.de>,
        "Williams, Dan J" <dan.j.williams@intel.com>,
        "Schofield, Alison" <alison.schofield@intel.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
        "Weiny, Ira" <ira.weiny@intel.com>,
        "Widawsky, Ben" <ben.widawsky@intel.com>
Subject: Re: [BISECTED] nvme probe failure with v5.13-rc1
Message-ID: <20210521173125.GC29013@redsun51.ssa.fujisawa.hgst.com>
References: <40071b11108987556d0473f9d968fe7dcd3f304a.camel@intel.com>
 <20210521145705.GA29013@redsun51.ssa.fujisawa.hgst.com>
 <e8ad9de961f3bfcb748733b59c189aa577ffa1fd.camel@intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <e8ad9de961f3bfcb748733b59c189aa577ffa1fd.camel@intel.com>
User-Agent: Mutt/1.12.1 (2019-06-15)
Precedence: bulk

On Fri, May 21, 2021 at 04:50:15PM +0000, Verma, Vishal L wrote:
> 
> Thanks for looking into it - yes with that the problem goes away.
> Let me chat with the simics folks and see if I can get them to fix it.

Thanks for confirming. It sounds like the simics implementation is
missing a default case in its identify function's CNS check and simply
loses track of the command. I'd wager it probably also times out for any
reserved or unsupported CNS value.