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From: Corey Minyard <minyard@acm.org>
To: Stefano Stabellini <sstabellini@kernel.org>
Cc: jgross@suse.com, Peng Fan <peng.fan@nxp.com>,
	Julien Grall <julien@xen.org>,
	roman@zededa.com,
	"jeff.kubascik@dornerworks.com" <jeff.kubascik@dornerworks.com>,
	Julien Grall <julien.grall@arm.com>,
	Nataliya Korovkina <malus.brandywine@gmail.com>,
	"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
	boris.ostrovsky@oracle.com,
	Stefano Stabellini <stefano.stabellini@xilinx.com>
Subject: Re: Troubles running Xen on Raspberry Pi 4 with 5.6.1 DomU
Date: Tue, 2 Jun 2020 13:34:20 -0500	[thread overview]
Message-ID: <20200602183420.GE2880@minyard.net> (raw)
In-Reply-To: <alpine.DEB.2.21.2005131249570.26167@sstabellini-ThinkPad-T480s>

Snip

> > > > > whether
> > > > > this was already done:
> > > > >      1) Does the kernel boot on baremetal (i.e without Xen)? This should
> > > > > help
> > > > > to confirm whether the bug is Xen is related.
> > > > 
> > > > Yes it boots
> > > > 
> > > > >      2) Swiotlb should not be necessary for basic dom0 boot on Arm. Did
> > > > > you try
> > > > > to disable it? This should help to confirm whether swiotlb is the
> > > > > problem or
> > > > > not.
> > > > 
> > > > It boots disabling swiotlb-xen
> > > 
> > > Thank you for the answer! swiotlb-xen should basically be a NOP for dom0. So
> > > this suggests swiotlb is doing some transformation on the DMA address.
> > > 
> > > I have an idea what may have gone wrong. AFAICT, xen-swiotlb seems to assume
> > > the DMA address space and CPU address space is the same. Is RPI using the
> > > same address space?
> > 
> > Another question, is the DMA request bounced? If so, are we sure the bounce
> > buffer is in the first GB?
> 
> Yes, it is. This is actually where we spent the last few days, and I
> found another little related bug in the initialization of the
> swiotlb-xen but now I am sure the memory is under 1GB (0x34000000-0x38000000)

Was anything ever resolved on this issue?  It just kind of ended for me,
and I looked in the main kernel and didn't find anything that looked
related.

Thanks,

-corey


  reply	other threads:[~2020-06-02 18:35 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-01  2:20 Troubles running Xen on Raspberry Pi 4 with 5.6.1 DomU Roman Shaposhnik
2020-05-01 11:42 ` Corey Minyard
2020-05-02  1:06   ` Roman Shaposhnik
2020-05-02  2:16     ` Corey Minyard
2020-05-02 11:46       ` Julien Grall
2020-05-02 17:35         ` Corey Minyard
2020-05-02 17:48           ` Julien Grall
2020-05-04 12:44             ` Corey Minyard
2020-05-04 20:54               ` Roman Shaposhnik
2020-05-05  3:52                 ` Stefano Stabellini
2020-05-05  5:36                   ` Roman Shaposhnik
2020-05-05 22:34                     ` Stefano Stabellini
2020-05-06  1:25                       ` Boris Ostrovsky
2020-05-06  4:19                       ` Roman Shaposhnik
2020-05-06  5:41                       ` Jürgen Groß
2020-05-06  8:54                         ` Peng Fan
2020-05-06 13:08                           ` Nataliya Korovkina
2020-05-06 13:42                             ` Boris Ostrovsky
2020-05-06 16:14                               ` Nataliya Korovkina
2020-05-06 17:34                                 ` Stefano Stabellini
2020-05-06 21:12                                   ` Roman Shaposhnik
2020-05-13  0:33                                     ` Stefano Stabellini
2020-05-13 10:11                                       ` Julien Grall
2020-05-13 15:11                                         ` Stefano Stabellini
2020-05-13 18:19                                           ` Julien Grall
2020-05-13 18:26                                             ` Julien Grall
2020-05-13 19:51                                               ` Stefano Stabellini
2020-06-02 18:34                                                 ` Corey Minyard [this message]
2020-06-02 19:24                                                   ` Stefano Stabellini
2020-06-03 15:29                                                     ` Corey Minyard
2020-06-03 15:37                                                       ` Stefano Stabellini
2020-06-03 19:49                                                         ` Corey Minyard
2020-06-03 19:55                                                         ` Roman Shaposhnik
2020-05-13 19:13                                             ` Roman Shaposhnik
2020-05-13 19:49                                             ` Stefano Stabellini
2020-05-06 17:35                                 ` Boris Ostrovsky
2020-05-06 21:10                                   ` Roman Shaposhnik
2020-05-06 17:16                           ` Stefano Stabellini
2020-05-06 17:32                         ` Stefano Stabellini
2020-05-02 18:48           ` Elliott Mitchell
2020-05-02 19:43             ` Julien Grall
2020-05-06 13:48         ` Corey Minyard
2020-05-06 13:56           ` Julien Grall
2020-05-02  0:05 ` Stefano Stabellini
2020-05-02  1:12   ` Roman Shaposhnik

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