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[34.140.199.248]) by smtp.gmail.com with ESMTPSA id l6-20020a05600c4f0600b0041469869d11sm5499477wmq.47.2024.03.28.06.59.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Mar 2024 06:59:02 -0700 (PDT) Date: Thu, 28 Mar 2024 13:59:00 +0000 From: Sebastian Ene To: Oliver Upton Cc: catalin.marinas@arm.com, james.morse@arm.com, jean-philippe@linaro.org, maz@kernel.org, qperret@google.com, qwandor@google.com, suzuki.poulose@arm.com, tabba@google.com, will@kernel.org, yuzenghui@huawei.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kernel-team@android.com Subject: Re: [PATCH 2/2] KVM: arm64: Allow only the specified FF-A calls to be forwarded to TZ Message-ID: References: <20240322124303.309423-1-sebastianene@google.com> <20240322124303.309423-2-sebastianene@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240328_065907_466961_48E9F34A X-CRM114-Status: GOOD ( 27.36 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Mar 26, 2024 at 01:42:26AM -0700, Oliver Upton wrote: > On Mon, Mar 25, 2024 at 11:29:39AM +0000, Sebastian Ene wrote: > > On Fri, Mar 22, 2024 at 07:07:52PM -0700, Oliver Upton wrote: > > > On Fri, Mar 22, 2024 at 12:43:03PM +0000, Sebastian Ene wrote: > > > > The previous logic used a deny list to filter the FF-A calls. Because of > > > > this, some of the calls escaped the check and they were forwarded by > > > > default to Trustzone. (eg. FFA_MSG_SEND_DIRECT_REQ was denied but the 64 > > > > bit version of the call was not). > > > > Modify the logic to use an allowlist and allow only the calls specified in > > > > the filter function to be proxied to TZ from the hypervisor. > > > > Hi Oliver, > > > > > > > > I had discussed this with Will back when the feature was upstreamed and > > > he said there's a lot of off-label calls that necessitate a denylist > > > implementation. Has anything changed to give us confidence that we can > > > be restrictive, at least on the FF-A range? > > > > > > > I remember your proposal for having an allowlist instead. The current change makes > > sense if we have https://lore.kernel.org/kvmarm/20240322124303.309423-1-sebastianene@google.com/ > > which opens the window for more FF-A calls to be forwarded to TZ. > > Got it. Last time I didn't catch the level of abuse we expect to endure > from vendors, but now it seems we will not support non-conforming calls > that appear in standardized SMC ranges. > > Adding mention of this to the changelog might be a good idea then. > That's a good point. I didn't create a changelog for this but I should add one and specify this. > -- > Thanks, > Oliver Thanks, Sebastian _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel