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from [10.61.2.175] ([122.99.82.10]) by smtp.gmail.com with ESMTPSA id u12sm120934pfm.165.2020.01.22.16.53.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 22 Jan 2020 16:53:36 -0800 (PST) Subject: Re: [PATCH kernel RFC 0/4] powerpc/powenv/ioda: Allow huge DMA window at 4GB From: Alexey Kardashevskiy To: linuxppc-dev@lists.ozlabs.org Cc: David Gibson , kvm@vger.kernel.org, Alistair Popple , Alex Williamson , Oliver O'Halloran References: <20191202015953.127902-1-aik@ozlabs.ru> <002b30d2-a9e4-da11-2423-b003288ce8f3@ozlabs.ru> Autocrypt: addr=aik@ozlabs.ru; keydata= mQINBE+rT0sBEADFEI2UtPRsLLvnRf+tI9nA8T91+jDK3NLkqV+2DKHkTGPP5qzDZpRSH6mD EePO1JqpVuIow/wGud9xaPA5uvuVgRS1q7RU8otD+7VLDFzPRiRE4Jfr2CW89Ox6BF+q5ZPV /pS4v4G9eOrw1v09lEKHB9WtiBVhhxKK1LnUjPEH3ifkOkgW7jFfoYgTdtB3XaXVgYnNPDFo PTBYsJy+wr89XfyHr2Ev7BB3Xaf7qICXdBF8MEVY8t/UFsesg4wFWOuzCfqxFmKEaPDZlTuR tfLAeVpslNfWCi5ybPlowLx6KJqOsI9R2a9o4qRXWGP7IwiMRAC3iiPyk9cknt8ee6EUIxI6 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DG9EMkK8IBXnLulqVk54kf7fE0jT/d8RTtJIA92GzsgdK2rpT1MBKKVffjRFGwN7nQVOzi4T XrB5p+6ML7Bd84xOEGsj/vdaXmz1esuH7BOZAGEZfLRCHJ0GVCSssg== Message-ID: <9423b5e0-75e9-4a7a-7e65-818879d52d48@ozlabs.ru> Date: Thu, 23 Jan 2020 11:53:32 +1100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 MIME-Version: 1.0 In-Reply-To: <002b30d2-a9e4-da11-2423-b003288ce8f3@ozlabs.ru> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Archived-At: List-Archive: List-Post: Anyone, ping? On 10/01/2020 15:18, Alexey Kardashevskiy wrote: > > > On 02/12/2019 12:59, Alexey Kardashevskiy wrote: >> Here is an attempt to support bigger DMA space for devices >> supporting DMA masks less than 59 bits (GPUs come into mind >> first). POWER9 PHBs have an option to map 2 windows at 0 >> and select a windows based on DMA address being below or above >> 4GB. >> >> This adds the "iommu=iommu_bypass" kernel parameter and >> supports VFIO+pseries machine - current this requires telling >> upstream+unmodified QEMU about this via >> -global spapr-pci-host-bridge.dma64_win_addr=0x100000000 >> or per-phb property. 4/4 advertises the new option but >> there is no automation around it in QEMU (should it be?). >> >> For now it is either 1<<59 or 4GB mode; dynamic switching is >> not supported (could be via sysfs). >> >> This is based on sha1 >> a6ed68d6468b Linus Torvalds "Merge tag 'drm-next-2019-11-27' of git://anongit.freedesktop.org/drm/drm". >> >> Please comment. Thanks. > > > David, Alistair, ping? Thanks, > > >> >> >> >> Alexey Kardashevskiy (4): >> powerpc/powernv/ioda: Rework for huge DMA window at 4GB >> powerpc/powernv/ioda: Allow smaller TCE table levels >> powerpc/powernv/phb4: Add 4GB IOMMU bypass mode >> vfio/spapr_tce: Advertise and allow a huge DMA windows at 4GB >> >> arch/powerpc/include/asm/iommu.h | 1 + >> arch/powerpc/include/asm/opal-api.h | 11 +- >> arch/powerpc/include/asm/opal.h | 2 + >> arch/powerpc/platforms/powernv/pci.h | 1 + >> include/uapi/linux/vfio.h | 2 + >> arch/powerpc/platforms/powernv/opal-call.c | 2 + >> arch/powerpc/platforms/powernv/pci-ioda-tce.c | 4 +- >> arch/powerpc/platforms/powernv/pci-ioda.c | 219 ++++++++++++++---- >> drivers/vfio/vfio_iommu_spapr_tce.c | 10 +- >> 9 files changed, 202 insertions(+), 50 deletions(-) >> > -- Alexey