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

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Message-ID: <22f811d4-d327-41dc-9daa-7c4aa75a5cba@redhat.com>
Date: Thu, 15 May 2025 13:09:27 +0200
From: Paolo Bonzini <pbonzini@...hat.com>
To: Kevin Wolf <kwolf@...hat.com>, Martin Wilck <mwilck@...e.com>
Cc: Christoph Hellwig <hch@...radead.org>,
 Benjamin Marzinski <bmarzins@...hat.com>, dm-devel@...ts.linux.dev,
 hreitz@...hat.com, mpatocka@...hat.com, snitzer@...nel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] dm mpath: Interface for explicit probing of active
 paths

On 5/15/25 12:11, Kevin Wolf wrote:
> The thing that we need to make sure, though, is that the emulated status
> we can expose to the guest is actually good enough. That Paolo said that
> the problem with reservation conflicts was mostly because -EBADE wasn't
> a thing yet gives me some hope that at least this wouldn't be a problem
> any more today.

Hmm I'm not sure about that anymore...  I was confused because some of 
the refactoring of block errors was done in 2017, which is around the 
same time I was working on persistent reservations in QEMU.

However, EBADE handling dates back to 2011 (commit 63583cca745f, "[SCSI] 
Add detailed SCSI I/O errors", 2011-02-12) and yet the Windows tests for 
PR were failing before QEMU switched to SG_IO for reads and writes.  I 
guess I have to try reverting that and retest, though.

Paolo