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Thu, 26 Jun 2025 10:43:42 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Alexander Potapenko Date: Thu, 26 Jun 2025 19:43:06 +0200 X-Gm-Features: Ac12FXyaDZROOxurpvkcs9ZXthsb5DglqUebhn0NTWwPhDYnIEGQjkQ7oqhUUFw Message-ID: Subject: Re: [PATCH 5/8] kmsan: convert kmsan_handle_dma to use physical addresses To: Leon Romanovsky Cc: Marek Szyprowski , Leon Romanovsky , Christoph Hellwig , Jonathan Corbet , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Robin Murphy , Joerg Roedel , Will Deacon , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?Q?Eugenio_P=C3=A9rez?= , Marco Elver , Dmitry Vyukov , Masami Hiramatsu , Mathieu Desnoyers , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , 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 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam11 X-Rspam-User: X-Rspamd-Queue-Id: C9FE3C000E X-Stat-Signature: a3xx4cxkkwpdiox6n9o8xxdj98mqta73 X-HE-Tag: 1750959823-488582 X-HE-Meta: U2FsdGVkX18TgPpF8yIoJFMG5Hv4mwSYUjd7JVbAwCNe6qPMOmt4Fk215gauDAUFjdghpvlgl5qB08EFC1cFJcEkajGfiYlVe/ebXy+dJVgVqGWiDpyT+wFXDf31KXUvfUmLicTUQdjv7s+YSz8pf7TgECVprj28oAi/quR5th1PzFpaaabDHaI2SFnme4E9INg2XShaqYIhzicnQLp2TjAd8flXtR7jl66EeM37yzXN4n3Rkjzc51yLvsCXS5pWZIbT417oGk/7GQub6xftWnZ8ijt9gT5xNmYSZ9QwdmKfBOXjc79FITM/+kdQJVxm7Bjwgru5cfVBiqJGxGgj4w66B4OfzcwBRa+n76GiZkueP9TODIDEGQe8Zqu8e90aB8cMBBjH3oRwwcs9mtK0IG8y/GVo9I9X8y7GegWQj7p/x5bJTOh5Byts2kKJCNWXBycpw+oi3mj733TlFd8DDzJSQyIt2WpVUmEZWAUKrNKUcorp8q/8+4Uq/zSm+Fr88SnXCNK90NVYWL2x9qbR5mKkBQExxxSzpMSQsSVPnekTEWA5MgwuLZKIZc0lwLFE2mHNUnYeaxcxFsC07PAWfIJXr5ThGGzfP0MDCX3npfOTDD+0UPKOwBKfh5rvy8U5WhRSQpaiNwv2p1Cf6ieJGvEcbrzc/FnclEOue6aBibDyRHiYw/QThdPlW9oyAlWJ1Itu8ckmJ9ToVqa8eW3GzVim8YRAU91XyQZZamrhLK7sATxYwEMdhN7VI/9Xb84Vvp+oozSyEzSE7Ag0nkGjNJYwL/cwHsdy7QkLzHyaKH0yNrfsjoWjPRCMV5Nw3GuQ6V/OzaHGSje6fanXKcpDHAR9XHdR1n471c36wUXpOXnzyDk9CZHcjrO0NMwD0T8/t43HtsW1uejnIUwdWEhIe42cPT3wEBDml2RYFXgNUPbQf01+3h7allhsPRUXX5XfKzauMCt36cF2Mm9F50b 4OQCVttx G63aXT7ZJx3H78XycG5ZVdga06Jm87xjydBenBBLdKmr9Nwh+IVGXuUmh4+zdqt94+PwrDhq9z2iOiuUaaheF+Qm2aDFzj/Oaaw0pWp6Geg7aC+21DcvvK9asmcSe52DVxLXtD4ejwVd00RPK64bZnxjZgIoHvGK+t8+SDuXRhyAyHbIQgyO6GF8inuOuBXfGL3H6kda+vCLF3hBQhiXrFgOs4Pfhu4h+wdFuomIuh0doSjXUgWqRE/3Sn0TXuuMEtNQpTIVGd3TTzXI+PMVHpq0WOzKNzuEq1KD1 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, 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 Wed, Jun 25, 2025 at 3:19=E2=80=AFPM Leon Romanovsky w= rote: > > From: Leon Romanovsky Hi Leon, > > Convert the KMSAN DMA handling function from page-based to physical > address-based interface. > > The refactoring renames kmsan_handle_dma() parameters from accepting > (struct page *page, size_t offset, size_t size) to (phys_addr_t phys, > size_t size). Could you please elaborate a bit why this is needed? Are you fixing some particular issue? > A PFN_VALID check is added to prevent KMSAN operations > on non-page memory, preventing from non struct page backed address, > > As part of this change, support for highmem addresses is implemented > using kmap_local_page() to handle both lowmem and highmem regions > properly. All callers throughout the codebase are updated to use the > new phys_addr_t based interface. KMSAN only works on 64-bit systems, do we actually have highmem on any of t= hese?