linux-kernel - Re: [PATCH v3] io: add io

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Message-ID: <20251119115316.5de0239a@fedora>
Date: Wed, 19 Nov 2025 11:53:16 +0100
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Daniel Almeida <daniel.almeida@...labora.com>
Cc: Alice Ryhl <aliceryhl@...gle.com>, Miguel Ojeda <ojeda@...nel.org>, Will
 Deacon <will@...nel.org>, Boqun Feng <boqun.feng@...il.com>, Gary Guo
 <gary@...yguo.net>, Björn Roy Baron
 <bjorn3_gh@...tonmail.com>, Benno Lossin <lossin@...nel.org>, Andreas
 Hindborg <a.hindborg@...nel.org>, Trevor Gross <tmgross@...ch.edu>, Danilo
 Krummrich <dakr@...nel.org>, Joerg Roedel <joro@...tes.org>, Robin Murphy
 <robin.murphy@....com>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, "Liam
 R. Howlett" <Liam.Howlett@...cle.com>, Asahi Lina
 <lina+kernel@...hilina.net>, linux-kernel@...r.kernel.org,
 rust-for-linux@...r.kernel.org, iommu@...ts.linux.dev, linux-mm@...ck.org
Subject: Re: [PATCH v3] io: add io_pgtable abstraction

On Wed, 12 Nov 2025 09:57:09 -0300
Daniel Almeida <daniel.almeida@...labora.com> wrote:

> > +    /// Unmap a range of virtually contiguous pages of the same size.
> > +    ///
> > +    /// # Safety
> > +    ///
> > +    /// This page table must contain a mapping at `iova` that consists of exactly `pgcount` pages
> > +    /// of size `pgsize`.  
> 
> Same here. I don’t think the above is necessarily a requirement.

It's not, indeed, the returned size will tell you how much was unmapped
if there's less to unmap, or the region has holes.