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

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Message-ID: <20250923235318.GD2617119@nvidia.com>
Date: Tue, 23 Sep 2025 20:53:18 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Magnus Lindholm <linmag7@...il.com>
Cc: Leon Romanovsky <leon@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.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 Tue, Sep 23, 2025 at 09:34:31PM +0200, Magnus Lindholm wrote:
> >
> > 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?
> >
> I'm running now on a fresh git pull from today so it's more like a
> 6.17-rc7. So no problems running the latest git at least.  I can
> dig deeper into this to see if we can figure this one out. First
> of all, is this alpha specific?

I spent a bit of time looking at the alpha patch and could not spot a
typo, it looked OK to me. I was worried for a bit that virt_to_phys()
vs __pa() were different, but I could not find a difference.

Suggest testing the same branch with the alpha patch reverted just to
rule out any issue in the core code. If it reproduces suggest to
bisect Leon's branch.

Thanks,
Jason