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[2003:cb:c707:3000:a06b:56f1:d152:db83]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ab772f4870bsm134060366b.32.2025.02.06.10.02.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 06 Feb 2025 10:02:19 -0800 (PST) Message-ID: <38333d54-62e4-4d61-a49d-48489d6f977e@redhat.com> Date: Thu, 6 Feb 2025 19:02:17 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/6] rust: page: Support borrowing `struct page` and physaddr conversion To: Asahi Lina , Jason Gunthorpe Cc: Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?UTF-8?Q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Jann Horn , Matthew Wilcox , Paolo Bonzini , Danilo Krummrich , Wedson Almeida Filho , Valentin Obst , Andrew Morton , linux-mm@kvack.org, airlied@redhat.com, Abdiel Janulgue , rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, asahi@lists.linux.dev References: <20250202-rust-page-v1-0-e3170d7fe55e@asahilina.net> <1eaf66ba-b2d3-448f-938b-913f17ca98a4@redhat.com> <20250204183933.GJ2296753@ziepe.ca> <1d379007-97c3-4bb9-93da-1a828f955fc4@redhat.com> <20250204202656.GL2296753@ziepe.ca> <08ce9562-9ded-4d95-a495-b60f90d75490@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspam-User: X-Stat-Signature: 7e9e1k1yhsfr8q7x1mromhjry5pht18g X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: E7602C0016 X-HE-Tag: 1738864950-13626 X-HE-Meta: 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 QwnrZ130 l7JJJj/4JAUxZ5e7YwDTXH9mHh2JBdgxJ7+/3JPalL2YB7H1j9sHNGO2JWTnUprGj17X9j8oOhUIzpnoKOjxRJtN/XRoSsqZY2BQQ9j61MMkmIZT9W4bvRI3SNWXkI/DyF0gEVqdC6zQZa46SYfQGV5+ryt5cnaUKkUN3qvrZK1qKyUSmpw1J3ZOcEZsNpWYAzYZyAF4idaf5yPDmsG/yooL1w9eaGLkFfaQoCfYXjyYNwcmCwTr/6Oa2pG6/x8EG4MwKpvsYEOwX6iVNt9xOf+uXJrpA/XbLSa6apLIAmevZhXBeI/FmoZPLzKGPUFVClQY/o32SwSgt+14IJryLY8XaACm8IpdBFaxaZm4TrIq7F0jGDMrUNSHCN2fPSRmJrrFGPGliHrE+s28RlCYJ61/iv88uZ85ZzKtWeWjg5cvxdIySIeuFJyAP3AKKrqQuBQaNF1BhQX9eMp2ZLOkK6nAPF4uw/VUFTGivtmfjEAUlcfs= X-Bogosity: Unsure, tests=bogofilter, spamicity=0.495939, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 04.02.25 22:18, Asahi Lina wrote: > > > On 2/5/25 5:47 AM, David Hildenbrand wrote: >> On 04.02.25 21:41, David Hildenbrand wrote: >>> On 04.02.25 21:26, Jason Gunthorpe wrote: >>>> On Tue, Feb 04, 2025 at 09:05:47PM +0100, David Hildenbrand wrote: >>>>> Fully agreed, this is going into the right direction. Dumping what's >>>>> mapped >>>>> is a different story. Maybe that dumping logic could simply be >>>>> written in C >>>>> for the time being? >>>> >>>> ? >>>> >>>> Isn't dumping just a >>>>     decode pte -> phys_to_virt() -> for_each_u64(virt) -> printk? >>>> >>> >>> IIUC, the problematic bit is that you might not have a directmap such >>> that phys_to_virt() would tell you the whole story. >> >> ... but it's late and I am confused. For dumping the *page table* that >> would not be required, only when dumping mapped page content (and at >> this point I am not sure if that is a requirement). >> >> So hopefully Asahi Lina can clarify what the issue was (if there is >> any :) ). > > Yes, the crash dumper has to dump the mapped page content. In fact, I > don't care about the page tables themselves other than PTE permission > bits, and the page tables alone are not useful for debugging firmware > crashes (and aren't even included in the dump verbatim, at least not the > kernel-allocated ones). The goal of the crash dumper is to take a > complete dump of firmware virtual memory address space (which includes > the kinds of memory I mentioned in [1]). The output is an ELF format > core dump with all memory that the GPU firmware can access, that the > kernel was able to successfully dump (which should be everything except > for MMIO if the bootloader/DT have the right reserved-memory setup). > > I *think* phys_to_virt should work just fine for *this* specific use > case on this platform, but I'm not entirely sure. I still want to use > the various pfn check functions before doing that, to exclude ranges > that would definitely not work. See my other mail, in /proc/kcore we do exactly that. See fs/proc/kcore.c, especially the KCORE_RAM case in read_kcore_iter(). So I would hope that at least for the Devcoredump we can find an alternative that does not require rust bindings, and maybe not even new c code at all (in a perfect world where you could just reuse /proc/kcore). -- Cheers, David / dhildenb