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Mon, 03 Mar 2025 22:27:57 -0800 (PST) Received: from [192.168.68.55] ([180.233.125.164]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7363986010asm5850843b3a.52.2025.03.03.22.27.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 03 Mar 2025 22:27:56 -0800 (PST) Message-ID: <780f593c-81cd-495c-8ca6-38ecd64ddb35@redhat.com> Date: Tue, 4 Mar 2025 16:27:48 +1000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 31/45] arm64: rme: Prevent Device mappings for Realms To: Steven Price , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" References: <20250213161426.102987-1-steven.price@arm.com> <20250213161426.102987-32-steven.price@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20250213161426.102987-32-steven.price@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/14/25 2:14 AM, Steven Price wrote: > Physical device assignment is not yet supported by the RMM, so it > doesn't make much sense to allow device mappings within the realm. > Prevent them when the guest is a realm. > > Signed-off-by: Steven Price > --- > Changes from v6: > * Fix the check in user_mem_abort() to prevent all pages that are not > guest_memfd() from being mapped into the protected half of the IPA. > Changes from v5: > * Also prevent accesses in user_mem_abort() > --- > arch/arm64/kvm/mmu.c | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > Reviewed-by: Gavin Shan