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Wed, 30 Mar 2022 17:51:15 +0000 Received: by kubenode520.mail-prod1.omega.ne1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 3767e03bf643ceaa3a5f31bec6822e45; Wed, 30 Mar 2022 17:51:11 +0000 (UTC) Date: Wed, 30 Mar 2022 13:51:07 -0400 From: "Alex Xu (Hello71)" Subject: "dma-mapping: remove CONFIG_DMA_REMAP" causes AMD SME boot fail To: Christoph Hellwig , regressions@lists.linux.dev Cc: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org MIME-Version: 1.0 Message-Id: <1648659326.eabkokyuym.none@localhost> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable References: <1648659326.eabkokyuym.none.ref@localhost> X-Mailer: WebService/1.1.20001 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.yahoo Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, After a recent kernel update, booting one of my machines causes it to=20 hang on a black screen. Pressing Lock keys on the USB keyboard does not=20 turn on the indicators, and the machine does not appear on the Ethernet=20 network. I don't have a serial port on this machine. I didn't try=20 netconsole, but I suspect it won't work. Setting mem_encrypt=3D0 seems to resolve the issue. Reverting f5ff79fddf0e=20 ("dma-mapping: remove CONFIG_DMA_REMAP") also appears to resolve the=20 issue. The machine in question has an AMD Ryzen 5 1600 and ASRock B450 Pro4. Cheers, Alex.