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Tsirkin" , Jason Wang , Xuan Zhuo , Eugenio =?iso-8859-1?Q?P=E9rez?= , Alexander Potapenko , Marco Elver , Dmitry Vyukov , Masami Hiramatsu , Mathieu Desnoyers , =?iso-8859-1?B?Suly9G1l?= Glisse , Andrew Morton , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, iommu@lists.linux.dev, virtualization@lists.linux.dev, kasan-dev@googlegroups.com, linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 6/8] dma-mapping: fail early if physical address is mapped through platform callback Message-ID: <20250727063028.GX402218@unreal> References: <5fc1f0ca52a85834b3e978c5d6a3171d7dd3c194.1750854543.git.leon@kernel.org> <02240cf7-c4d4-4296-9b1e-87b4231874a1@arm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <02240cf7-c4d4-4296-9b1e-87b4231874a1@arm.com> On Fri, Jul 25, 2025 at 09:04:50PM +0100, Robin Murphy wrote: > On 2025-06-25 2:19 pm, Leon Romanovsky wrote: > > From: Leon Romanovsky > > > > All platforms which implement map_page interface don't support physical > > addresses without real struct page. Add condition to check it. > > As-is, the condition also needs to cover iommu-dma, because that also still > doesn't support non-page-backed addresses. You can't just do a simple > s/page/phys/ rename and hope it's OK because you happen to get away with it > for coherent, 64-bit, trusted devices. It needs to be follow up patch. Is this what you envision? diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index e1586eb52ab34..31214fde88124 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -167,6 +167,12 @@ dma_addr_t dma_map_phys(struct device *dev, phys_addr_t phys, size_t size, arch_dma_map_phys_direct(dev, phys + size)) addr = dma_direct_map_phys(dev, phys, size, dir, attrs); else if (use_dma_iommu(dev)) + if (IS_ENABLED(CONFIG_DMA_API_DEBUG) && + !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + is_pfn_valid = pfn_valid(PHYS_PFN(phys)); + + if (unlikely(!is_pfn_valid)) + return DMA_MAPPING_ERROR; addr = iommu_dma_map_phys(dev, phys, size, dir, attrs); else { struct page *page = phys_to_page(phys); ~ ~ ~ Thanks