From: Leonardo Bras <leobras.c@gmail.com>
To: Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Alexey Kardashevskiy <aik@ozlabs.ru>,
Thiago Jung Bauermann <bauerman@linux.ibm.com>,
Ram Pai <linuxram@us.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 6/6] powerpc/pseries/iommu: Avoid errors when DDW starts at 0x00
Date: Fri, 26 Jun 2020 14:46:46 -0300 [thread overview]
Message-ID: <1069466fa3a373e92d9db18957674b1d9c6e9cf2.camel@gmail.com> (raw)
In-Reply-To: <20200624062411.367796-7-leobras.c@gmail.com>
On Wed, 2020-06-24 at 03:24 -0300, Leonardo Bras wrote:
> As of today, enable_ddw() will return a non-null DMA address if the
> created DDW maps the whole partition. If the address is valid,
> iommu_bypass_supported_pSeriesLP() will consider iommu bypass enabled.
>
> This can cause some trouble if the DDW happens to start at 0x00.
>
> Instead if checking if the address is non-null, check directly if
> the DDW maps the whole partition, so it can bypass iommu.
>
> Signed-off-by: Leonardo Bras <leobras.c@gmail.com>
This patch has a bug in it. I will rework it soon.
Please keep reviewing patches 1-5.
Best regards,
Leonardo
next prev parent reply other threads:[~2020-06-26 17:48 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-24 6:24 [PATCH v2 0/6] Remove default DMA window before creating DDW Leonardo Bras
2020-06-24 6:24 ` [PATCH v2 1/6] powerpc/pseries/iommu: Create defines for operations in ibm, ddw-applicable Leonardo Bras
2020-07-01 8:16 ` [PATCH v2 1/6] powerpc/pseries/iommu: Create defines for operations in ibm,ddw-applicable Alexey Kardashevskiy
2020-07-01 13:28 ` Leonardo Bras
2020-07-02 0:21 ` Alexey Kardashevskiy
2020-07-02 0:36 ` Leonardo Bras
2020-07-02 0:43 ` Alexey Kardashevskiy
2020-07-02 0:46 ` Leonardo Bras
2020-06-24 6:24 ` [PATCH v2 2/6] powerpc/pseries/iommu: Update call to ibm, query-pe-dma-windows Leonardo Bras
2020-07-01 8:17 ` [PATCH v2 2/6] powerpc/pseries/iommu: Update call to ibm,query-pe-dma-windows Alexey Kardashevskiy
2020-07-01 14:04 ` Leonardo Bras
2020-07-02 0:18 ` Alexey Kardashevskiy
2020-07-02 0:28 ` Leonardo Bras
2020-06-24 6:24 ` [PATCH v2 3/6] powerpc/pseries/iommu: Move window-removing part of remove_ddw into remove_dma_window Leonardo Bras
2020-06-24 6:24 ` [PATCH v2 4/6] powerpc/pseries/iommu: Remove default DMA window before creating DDW Leonardo Bras
2020-07-01 8:17 ` Alexey Kardashevskiy
2020-07-01 19:48 ` Leonardo Bras
2020-07-02 0:25 ` Alexey Kardashevskiy
2020-06-24 6:24 ` [PATCH v2 5/6] powerpc/pseries/iommu: Make use of DDW even if it does not map the partition Leonardo Bras
2020-06-26 15:23 ` Leonardo Bras
2020-06-26 17:55 ` Leonardo Bras
2020-07-01 8:16 ` Alexey Kardashevskiy
2020-07-01 19:57 ` Leonardo Bras
2020-07-01 23:48 ` Leonardo Bras
2020-07-02 0:31 ` Alexey Kardashevskiy
2020-07-02 0:54 ` Leonardo Bras
2020-07-03 6:27 ` Leonardo Bras
2020-06-24 6:24 ` [PATCH v2 6/6] powerpc/pseries/iommu: Avoid errors when DDW starts at 0x00 Leonardo Bras
2020-06-26 17:46 ` Leonardo Bras [this message]
2020-07-01 8:04 ` Alexey Kardashevskiy
2020-07-01 19:59 ` Leonardo Bras
2020-06-24 15:54 ` [PATCH v2 0/6] Remove default DMA window before creating DDW Leonardo Bras
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