linux-kernel - Re: [PATCH net-next 3/3] net: stmmac: Introducing support for Page Pool

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Date:   Tue, 23 Jul 2019 11:51:12 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     jonathanh@...dia.com
Cc:     robin.murphy@....com, Jose.Abreu@...opsys.com, lists@...h.nu,
        ilias.apalodimas@...aro.org, Joao.Pinto@...opsys.com,
        alexandre.torgue@...com, maxime.ripard@...tlin.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com, wens@...e.org,
        mcoquelin.stm32@...il.com, linux-tegra@...r.kernel.org,
        peppe.cavallaro@...com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next 3/3] net: stmmac: Introducing support for Page
 Pool

From: Jon Hunter <jonathanh@...dia.com>
Date: Tue, 23 Jul 2019 13:09:00 +0100

> Setting "iommu.passthrough=1" works for me. However, I am not sure where
> to go from here, so any ideas you have would be great.

Then definitely we are accessing outside of a valid IOMMU mapping due
to the page pool support changes.

Such a problem should be spotted with swiommu enabled with debugging.