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

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Message-ID: <aCQh4NeXtLLCQeVN@infradead.org>
Date: Tue, 13 May 2025 21:53:52 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Martin Wilck <mwilck@...e.com>
Cc: Christoph Hellwig <hch@...radead.org>, 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 Tue, May 13, 2025 at 10:17:58AM +0200, Martin Wilck wrote:
> If we emulate a SCSI device to a VM, the device should support commands
> like persistent reservations properly.

Then point it to an actual SCSI device, and not a multipath-device.

Trying to split responsibility for handling the initiator side work is
not in any way support in the SCSI spec, and by trying it anyway you
are just creating tons of of problems.

> 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.