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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-aa698e922dasm64701866b.84.2024.12.09.07.03.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 09 Dec 2024 07:03:31 -0800 (PST) Message-ID: <08440076-3c04-4bb1-b339-071b82d638d2@oss.qualcomm.com> Date: Mon, 9 Dec 2024 16:03:29 +0100 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] drm/msm/a6xx: Skip gpu secure fw load in EL2 mode To: Akhil P Oommen , Rob Clark , Sean Paul , Konrad Dybcio , Abhinav Kumar , Dmitry Baryshkov , Marijn Suijten , David Airlie , Simona Vetter , Elliot Berman , Pavan Kondeti Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20241209-drm-msm-kvm-support-v1-1-1c983a8a8087@quicinc.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20241209-drm-msm-kvm-support-v1-1-1c983a8a8087@quicinc.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: M-SHl1tBR_dTKhQ2cw53J7RwD9FyPr8g X-Proofpoint-GUID: M-SHl1tBR_dTKhQ2cw53J7RwD9FyPr8g X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 bulkscore=0 suspectscore=0 priorityscore=1501 adultscore=0 mlxlogscore=938 clxscore=1015 spamscore=0 mlxscore=0 lowpriorityscore=0 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2412090118 On 9.12.2024 9:19 AM, Akhil P Oommen wrote: > When kernel is booted in EL2, SECVID registers are accessible to the > KMD. So we can use that to switch GPU's secure mode to avoid dependency > on Zap firmware. Also, we can't load a secure firmware without a > hypervisor that supports it. > > Tested following configurations on sa8775p chipset (Adreno 663 gpu): > > 1. Gunyah (No KVM) - Loads zap shader based on DT > 2. KVM in VHE - Skips zap shader load and programs SECVID register > 3. KVM in nVHE - Loads zap shader based on DT > 4. Kernel in EL2 with CONFIG_KVM=n - Skips zap shader load and > programs SECVID register > > For (1) and (3) configuration, this patch doesn't have any impact. > Driver loads secure firmware based on other existing hints. > > Signed-off-by: Akhil P Oommen > --- [...] > + > +#ifdef CONFIG_ARM64 > + /* > + * We can access SECVID_TRUST_CNTL register when kernel is booted in EL2 mode. So, use it > + * to switch the secure mode to avoid the dependency on zap shader. > + */ > + if (is_kernel_in_hyp_mode()) > + goto direct_switch; So I suppose this would ideally be like hv_is_hyperv_initialized() but for QHEE/Gunyah, which is not going to happen, as we have millions of devices with old unupstreamable-ABI-Gunyah running.. This looks like the next best things then, so no objections, but.. [...] > + ret = a6xx_switch_secure_mode(gpu); > + if (!ret) this should definitely be a if (ret) Konrad