linux-kernel - Re: [PATCH 0/2] dm mpath: Interface for explicit probing of active paths

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Message-ID: <bbe13eae-63c4-4f1d-b510-517d5e8d6a28@redhat.com>
Date: Thu, 15 May 2025 13:14:13 +0200
From: Paolo Bonzini <pbonzini@...hat.com>
To: Christoph Hellwig <hch@...radead.org>, Martin Wilck <mwilck@...e.com>
Cc: Hannes Reinecke <hare@...e.de>, Kevin Wolf <kwolf@...hat.com>,
 dm-devel@...ts.linux.dev, hreitz@...hat.com, mpatocka@...hat.com,
 snitzer@...nel.org, bmarzins@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] dm mpath: Interface for explicit probing of active
 paths

On 5/14/25 06:53, Christoph Hellwig wrote:
>> And no, passing the SCSI devices to the VM and doing multipath in the
>> the guest doesn't work. The transport layer isn't properly emulated
>> (bluntly speaking, we have no FC emulation).
> 
> Then fix that.  Because without it you will be in never ending pain
> due to impedance mismatch.

FC HBAs don't even expose enough of the protocol to actually do it 
sensibly, so that can't really be done.  Hannes tried.

Paolo