linux-kernel - Re: [PATCH v3 11/13] x86/xen: use lazy_mmu

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Message-ID: <1d9f416fd3665faf27841b6305b1e8d661427125.camel@physik.fu-berlin.de>
Date: Fri, 24 Oct 2025 17:51:54 +0200
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: David Hildenbrand <david@...hat.com>, David Woodhouse
 <dwmw2@...radead.org>,  Kevin Brodsky <kevin.brodsky@....com>,
 linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org, Alexander Gordeev
 <agordeev@...ux.ibm.com>,  Andreas Larsson <andreas@...sler.com>, Andrew
 Morton <akpm@...ux-foundation.org>, Boris Ostrovsky	
 <boris.ostrovsky@...cle.com>, Borislav Petkov <bp@...en8.de>, Catalin
 Marinas	 <catalin.marinas@....com>, Christophe Leroy
 <christophe.leroy@...roup.eu>,  Dave Hansen <dave.hansen@...ux.intel.com>,
 "David S. Miller" <davem@...emloft.net>, "H. Peter Anvin"	 <hpa@...or.com>,
 Ingo Molnar <mingo@...hat.com>, Jann Horn <jannh@...gle.com>,  Juergen
 Gross <jgross@...e.com>, "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 Lorenzo Stoakes	 <lorenzo.stoakes@...cle.com>, Madhavan Srinivasan
 <maddy@...ux.ibm.com>,  Michael Ellerman <mpe@...erman.id.au>, Michal Hocko
 <mhocko@...e.com>, Mike Rapoport <rppt@...nel.org>, Nicholas Piggin
 <npiggin@...il.com>, Peter Zijlstra <peterz@...radead.org>, Ryan Roberts	
 <ryan.roberts@....com>, Suren Baghdasaryan <surenb@...gle.com>, Thomas
 Gleixner	 <tglx@...utronix.de>, Vlastimil Babka <vbabka@...e.cz>, Will
 Deacon	 <will@...nel.org>, Yeoreum Yun <yeoreum.yun@....com>, 
	linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org, 
	sparclinux@...r.kernel.org, xen-devel@...ts.xenproject.org, x86@...nel.org
Subject: Re: [PATCH v3 11/13] x86/xen: use lazy_mmu_state when
 context-switching

Hi David,

On Fri, 2025-10-24 at 17:47 +0200, David Hildenbrand wrote:
> > Please have people test kernel changes on SPARC on real hardware. QEMU does not
> > emulate sun4v, for example, and therefore testing in QEMU does not cover all
> > of SPARC hardware.
> > 
> > There are plenty of people on the debian-sparc, gentoo-sparc and sparclinux
> > LKML mailing lists that can test kernel patches for SPARC. If SPARC-relevant
> > changes need to be tested, please ask there and don't bury such things in a
> > deeply nested thread in a discussion which doesn't even have SPARC in the
> > mail subject.
> 
> out of curiosity, do people monitor sparclinux@ for changes to actively 
> offer testing when required -- like would it be sufficient to CC 
> relevant maintainers+list (like done here) and raise in the cover letter 
> that some testing help would be appreciated?

Yes, that's definitely the case. But it should be obvious that from the subject
of the mail that the change affects SPARC as not everyone can read every mail
they're receiving through mailing lists.

I'm trying to keep up, but since I'm on mailing lists for many different architectures,
mails can slip through the cracks.

For people that want to test changes on SPARC regularly, I can also offer accounts
on SPARC test machines running on a Solaris LDOM (logical domain) on a SPARC T4.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913