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[199.106.103.254]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3a0972efa0bsm5582969a91.8.2026.09.24.10.03.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Sep 2026 10:03:19 -0700 (PDT) Date: Thu, 24 Sep 2026 10:03:13 -0700 From: Jonathan Cameron To: Suzuki K Poulose Cc: kvm@vger.kernel.org, kvmarm@lists.linux.dev, maz@kernel.org, will@kernel.org, catalin.marinas@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, steven.price@arm.com, aneesh.kumar@kernel.org, oupton@kernel.org, gshan@redhat.com, joey.gouly@arm.com, tabba@google.com, yuzenghui@huawei.com, linux-coco@lists.linux.dev, gankulkarni@os.amperecomputing.com, sdonthineni@nvidia.com, alpergun@google.com, fj0570is@fujitsu.com, WeiLin.Chang@arm.com, lpieralisi@kernel.org, enju.kohei@fujitsu.com, sudeep.holla@arm.com Subject: Re: [PATCH v19 3/7] firmware: arm_rmm: Configure the RMM with the host's page size Message-ID: <20260924100313.00003be7@oss.qualcomm.com> In-Reply-To: <20260924135201.850038-4-suzuki.poulose@arm.com> References: <20260924135201.850038-1-suzuki.poulose@arm.com> <20260924135201.850038-4-suzuki.poulose@arm.com> Organization: Qualcomm X-Mailer: Claws Mail 4.4.0 (GTK 3.24.51; x86_64-w64-mingw32) Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: oDdDrJ4AKHu3Jm2kfU9gc2Me9cE6wq0N X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTI0MDA2OSBTYWx0ZWRfX0LR/NPdhi7jT 37CpByCdvw+Ro7EmIAfyiXq5Mnt+2lkZtpAVVEcRrd+Q7/rQM/AggeGp3YaNiU0cPdCupcD6onr sUflgMWbJnN/dn5kXjeEGQS3c4+2C6QfmAnabywgl6poFriStqmJ+V5s7b6CNyfm/Cb81/42+Pn DLZ/wki1Q9ndYVawIbiaBuHBminmCuEeQga8L1hZ9HZsZjAL3CMnDA+3fhv5LfSSdLRZGhz+7tI +LZt+ZvIttwnQSO3DnH/986eNemteDJGG/xWbyK1M1LFu6Eu9VYCMehQ7xdJAI2U8HbgHxZGXUj 4VgJrJtsLvcPCm78ThC9pYHgwv4IDvxl0/knEBZylOjKRsoRsbjhx7yGzOuIE5ChiLsUMw2IFFE bvuyWPxiqJWMjZzVIle/P/bhzazqoErZ6AxUNZMnWgFASMHV6ab/9S0i4BKHVDckrHVejr+xuJh 1qwxcs13U3y159ytnOw== X-Proofpoint-Spam-Info: AW1haW4tMjYwOTI0MDA2OSBTYWx0ZWRfX7Nz4Nz/39aBN dSLGqnAFiuuzx9zyHRgPuJ/7CJLtIts2QNXoilGa6cN4OG/ZP18EebCDHKbvQTTRy3T5+OgNxb6 JaZlW3bvB/Nly1D7Xoz1Ax/qXkAU+JI= X-Proofpoint-ORIG-GUID: oDdDrJ4AKHu3Jm2kfU9gc2Me9cE6wq0N X-Authority-Analysis: v=2.4 cv=GI+dgeNK c=1 sm=1 tr=0 ts=6ab557da cx=c_pps a=UNFcQwm+pnOIJct1K4W+Mw==:117 a=JYp8KDb2vCoCEuGobkYCKw==:17 a=kj9zAlcOel0A:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=7CQSdrXTAAAA:8 a=EUspDBNiAAAA:8 a=t3n5nvtZY-KuBPRqFMwA:9 a=CjuIK1q_8ugA:10 a=uKXjsCUrEbL0IQVhDsJ9:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-24_04,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 bulkscore=0 malwarescore=0 impostorscore=0 suspectscore=0 spamscore=0 adultscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609240069 On Thu, 24 Sep 2026 14:51:57 +0100 Suzuki K Poulose wrote: > RMM v2.0 brings the ability to set the RMM's granule size. Check the > feature registers and configure the RMM so that it matches the host's > page size. This means that operations can be done with a granularity > equal to PAGE_SIZE. > > Signed-off-by: Steven Price > Signed-off-by: Suzuki K Poulose Hi Suzuki, Some trivial stuff inline. Assuming that is addressed. Reviewed-by: Jonathan Cameron > --- > drivers/firmware/arm_rmm/rmi.c | 70 ++++++++++++++++++++++++++++++++++ > 1 file changed, 70 insertions(+) > > diff --git a/drivers/firmware/arm_rmm/rmi.c b/drivers/firmware/arm_rmm/rmi.c > index 3baba931f92e4..c9ea964fd9081 100644 > --- a/drivers/firmware/arm_rmm/rmi.c > +++ b/drivers/firmware/arm_rmm/rmi.c > + > +static int rmi_configure(void) > +{ > + unsigned long granule_feature; > + unsigned long granule_size; > + int ret = 0; Value not used. Fine if it is future churn reduction, but I didn't spot where if so. I'm guessing left over from refactoring > + > + switch (PAGE_SIZE) { > + case SZ_4K: > + granule_size = RMI_GRANULE_SIZE_4KB; > + granule_feature = RMI_FEATURE_REGISTER_1_RMI_GRAN_SZ_4KB; > + break; > + case SZ_16K: > + granule_size = RMI_GRANULE_SIZE_16KB; > + granule_feature = RMI_FEATURE_REGISTER_1_RMI_GRAN_SZ_16KB; > + break; > + case SZ_64K: > + granule_size = RMI_GRANULE_SIZE_64KB; > + granule_feature = RMI_FEATURE_REGISTER_1_RMI_GRAN_SZ_64KB; > + break; > + default: > + BUILD_BUG(); > + } > + > + if (!(rmi_feat_reg(1) & granule_feature)) { > + pr_err("RMM does not support %luKB granules\n", > + PAGE_SIZE >> 10); > + return -ENXIO; > + } > + > + struct rmm_config *config __free(free_page) = > + (struct rmm_config *)get_zeroed_page(GFP_KERNEL); > + > + if (!config) { > + pr_err("Unable to allocate memory for RMM config\n"); > + return -ENOMEM; > + } > + > + config->rmi_granule_size = granule_size; > + > + /* > + * For now we set the tracking_region_size to 0 which is the only option > + * for 4KB PAGE_SIZE (1GB for 4KB PAGE_SIZE, 32MB/512MB for 16KB/64KB). > + * TODO: Support other tracking sizes via Kconfig option for other > + * PAGE_SIZES > + */ > + config->tracking_region_size = 0; > + > + ret = rmi_rmm_config_set(virt_to_phys(config)); > + if (ret) { > + pr_err("RMM config set failed (%d)\n", ret); > + ret = -EINVAL; return -EINVAL; > + } > + > + return ret; return 0; So obvious this is the good path without anyone having to think about it! I did quick check on whether this was to reduce churn due to later changes but couldn't immediately spot anything > +}