linux-kernel - Re: [PATCH 1/9] alpha: Convert mapping routine to rely on physical address

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Message-ID: <20250923171819.GM10800@unreal>
Date: Tue, 23 Sep 2025 20:18:19 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Magnus Lindholm <linmag7@...il.com>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>,
	Jason Gunthorpe <jgg@...dia.com>,
	Andreas Larsson <andreas@...sler.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"David S. Miller" <davem@...emloft.net>,
	Geoff Levand <geoff@...radead.org>, Helge Deller <deller@....de>,
	Ingo Molnar <mingo@...hat.com>, iommu@...ts.linux.dev,
	"James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
	Jason Wang <jasowang@...hat.com>, Juergen Gross <jgross@...e.com>,
	linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Matt Turner <mattst88@...il.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Richard Henderson <richard.henderson@...aro.org>,
	sparclinux@...r.kernel.org,
	Stefano Stabellini <sstabellini@...nel.org>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	virtualization@...ts.linux.dev, x86@...nel.org,
	xen-devel@...ts.xenproject.org
Subject: Re: [PATCH 1/9] alpha: Convert mapping routine to rely on physical
 address

On Mon, Sep 22, 2025 at 11:04:06PM +0200, Magnus Lindholm wrote:
> On Thu, Sep 18, 2025 at 8:45 PM Leon Romanovsky <leon@...nel.org> wrote:
> >
> > From: Leon Romanovsky <leonro@...dia.com>
> >
> > Alpha doesn't need struct *page and can perform mapping based on
> > physical addresses. So convert it to implement new .map_phys callback.
> 
> 
> Hi,
> 
> SInce this patch affects the Alpha platform I got curious and decided to
> try it out. The patch series requires some preparatory patches. Leon
> provided me with links to his dmabuf-vfio branch, which had the
> patches (and some prerequisite stuff) applied already.
> 
> Based on the dmabuf-vfio branch,  I've built a kernel and tested it on
> my ES40 Alphaserver, the kernel booted fine but after a while of
> moderate filesystem load I started seeing some ext3/4 related error
> messages in the system logs. Rebooting with my old kernel into
> single user mode, I was able to recover the filesystem using fsck.
> Clearly this set of patches breaks things (at least on Alpha).

I will try to setup Alpha architecture in QEMU in following days, but
would like to ask first. Did you test alpha on clean v6.17-rc5 (without
my patches) as a reference?

Thanks