Re: [Xen-devel] REGRESSION: Xen 4.13 RC5 fails to bootstrap Dom0 on ARM

From: Stefano Stabellini <sstabellini@kernel.org>
To: roman@zededa.com
Cc: xen-devel@lists.xenproject.org,
	Stefano Stabellini <sstabellini@kernel.org>,
	julien@xen.org,
	Stefano Stabellini <stefano.stabellini@xilinx.com>
Subject: Re: [Xen-devel] REGRESSION: Xen 4.13 RC5 fails to bootstrap Dom0 on ARM
Date: Tue, 17 Dec 2019 10:30:41 -0800 (PST)	[thread overview]
Message-ID: <alpine.DEB.2.21.1912171029300.12921@sstabellini-ThinkPad-T480s> (raw)
In-Reply-To: <5db3b29a-2f07-c807-1ee2-503d779548f7@xen.org>

On Tue, 17 Dec 2019, Julien Grall wrote:
> Hi,
> 
> On 17/12/2019 04:39, Roman Shaposhnik wrote:
> > On Mon, Dec 16, 2019 at 6:55 PM Stefano Stabellini
> > <sstabellini@kernel.org> wrote:
> > > On Mon, 16 Dec 2019, Roman Shaposhnik wrote:
> > > If I sum all the memory sizes together I get 0x3ddfd000 which is 990M.
> > > If so, I wonder how you could boot succesfully with dom0_mem=1024M even
> > > on Xen 4.12... :-?
> > 
> > That is a very interesting observation indeed! I actually don't
> > remember where that device tree came from, but I think it was from one
> > of the Linaro sites.
> 
> This is mostly likely because of:
> 
> commit 6341a674573f1834f083f0ab0f5b36b075f9e02e
> Author: Julien Grall <julien.grall@arm.com>
> Date:   Wed Aug 21 22:42:31 2019 +0100
> 
>     xen/arm: domain_build: Don't continue if unable to allocate all dom0 banks
> 
>     Xen will only print a warning if there are memory unallocated when using
>     1:1 mapping (only used by dom0). This also includes the case where no
>     memory has been allocated.
> 
>     It will bring to all sort of issues that can be hard to diagnostic for
>     users (the warning can be difficult to spot or disregard).
> 
>     If the users request 1GB of memory, then most likely they want the exact
>     amount and not 512MB. So panic if all the memory has not been allocated.
> 
>     After this change, the behavior is the same as for non-1:1 memory
>     allocation (used by domU).
> 
>     At the same time, reflow the message to have the format on a single
>     line.
> 
>     Signed-off-by: Julien Grall <julien.grall@arm.com>
>     Acked-by: Stefano Stabellini <sstabellini@kernel.org>

Ah! Roman, could you please post the full boot log of a successful 4.12
boot?

If it has a "Failed to allocate requested dom0 memory" message, then we
know what the issue is.

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