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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c82bb121ccasm20453467a12.29.2026.05.20.17.58.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 20 May 2026 17:58:59 -0700 (PDT) Message-ID: <2ad282da-88fd-49ab-8145-964ff298ca83@redhat.com> Date: Thu, 21 May 2026 10:58:48 +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 v14 08/44] arm64: RMI: Ensure that the RMM has GPT entries for memory 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" , Emi Kisanuki , Vishal Annapurve , WeiLin.Chang@arm.com, Lorenzo.Pieralisi2@arm.com References: <20260513131757.116630-1-steven.price@arm.com> <20260513131757.116630-9-steven.price@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20260513131757.116630-9-steven.price@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi Steven, On 5/13/26 11:17 PM, Steven Price wrote: > The RMM maintains the state of all the granules in the system to make > sure that the host is abiding by the rules. This state can be maintained > at different granularity, per page (TRACKING_FINE) or per region > (TRACKING_COARSE). The region size depends on the underlying > "RMI_GRANULE_SIZE". For a "coarse" region all pages in the region must > be of the same state, this implies we need to have "fine" tracking for > DRAM, so that we can delegated individual pages. > > For now we only support a statically carved out memory for tracking > granules for the "fine" regions. This can be extended in the future to > allow modifying the tracking granularity and remove the need for a > static allocation. > > Similarly, the firmware may create L0 GPT entries describing the total > address space. But if we change the "PAS" (Physical Address Space) of a > granule then the firmware may need to create L1 tables to track the PAS > at a finer granularity. > > Note: support is currently missing for SROs which means that if the RMM > needs memory donating this will fail (and render CCA unusable in Linux). > This effectively means that the L1 GPT tables must be created before > Linux starts. > > Signed-off-by: Steven Price > --- > Changes since v13: > * Moved out of KVM > --- > arch/arm64/include/asm/rmi_cmds.h | 2 + > arch/arm64/kernel/rmi.c | 103 ++++++++++++++++++++++++++++++ > 2 files changed, 105 insertions(+) > > diff --git a/arch/arm64/include/asm/rmi_cmds.h b/arch/arm64/include/asm/rmi_cmds.h > index 9179934925c5..9078a2920a7c 100644 > --- a/arch/arm64/include/asm/rmi_cmds.h > +++ b/arch/arm64/include/asm/rmi_cmds.h > @@ -33,6 +33,8 @@ struct rmi_sro_state { > } while (RMI_RETURN_STATUS(res.a0) == RMI_BUSY || \ > RMI_RETURN_STATUS(res.a0) == RMI_BLOCKED) > > +bool rmi_is_available(void); > + > unsigned long rmi_sro_execute(struct rmi_sro_state *sro, gfp_t gfp); > void rmi_sro_free(struct rmi_sro_state *sro); > > diff --git a/arch/arm64/kernel/rmi.c b/arch/arm64/kernel/rmi.c > index a14ead5dedda..52a415e99500 100644 > --- a/arch/arm64/kernel/rmi.c > +++ b/arch/arm64/kernel/rmi.c > @@ -7,6 +7,8 @@ > > #include > > +static bool arm64_rmi_is_available; > + > unsigned long rmm_feat_reg0; > unsigned long rmm_feat_reg1; > > @@ -88,6 +90,102 @@ static int rmi_configure(void) > return 0; > } > > +/* > + * For now we set the tracking_region_size to 0 for RMI_RMM_CONFIG_SET(). > + * TODO: Support other tracking sizes (via Kconfig option). > + */ > +#ifdef CONFIG_PAGE_SIZE_4KB > +#define RMM_GRANULE_TRACKING_SIZE SZ_1G > +#elif defined(CONFIG_PAGE_SIZE_16KB) > +#define RMM_GRANULE_TRACKING_SIZE SZ_32M > +#elif defined(CONFIG_PAGE_SIZE_64KB) > +#define RMM_GRANULE_TRACKING_SIZE SZ_512M > +#endif > + RMM_GRANULE_TRACKING_SIZE is never used in this series. > +/* > + * Make sure the area is tracked by RMM at FINE granularity. > + * We do not support changing the tracking yet. > + */ > +static int rmi_verify_memory_tracking(phys_addr_t start, phys_addr_t end) > +{ > + while (start < end) { > + unsigned long ret, category, state, next; > + > + ret = rmi_granule_tracking_get(start, end, &category, &state, &next); > + if (ret != RMI_SUCCESS || > + state != RMI_TRACKING_FINE || > + category != RMI_MEM_CATEGORY_CONVENTIONAL) { > + /* TODO: Set granule tracking in this case */ > + pr_err("Granule tracking for region isn't fine/conventional: %llx", > + start); > + return -ENODEV; > + } > + start = next; > + } > + > + return 0; > +} > + > +static unsigned long rmi_l0gpt_size(void) > +{ > + return 1UL << (30 + FIELD_GET(RMI_FEATURE_REGISTER_1_L0GPTSZ, > + rmm_feat_reg1)); > +} > + rmi_l0gpt_size() is only used by rmi_create_gpts(), its logic can be combined to that function. > +static int rmi_create_gpts(phys_addr_t start, phys_addr_t end) > +{ > + unsigned long l0gpt_sz = rmi_l0gpt_size(); > + > + start = ALIGN_DOWN(start, l0gpt_sz); > + end = ALIGN(end, l0gpt_sz); > + > + while (start < end) { > + int ret = rmi_gpt_l1_create(start); > + > + /* > + * Make sure the L1 GPT tables are created for the region. > + * RMI_ERROR_GPT indicates the L1 table already exists. > + */ > + if (ret && ret != RMI_ERROR_GPT) { > + /* > + * FIXME: Handle SRO so that memory can be donated for > + * the tables. > + */ > + pr_err("GPT Level1 table missing for %llx\n", start); > + return -ENOMEM; > + } > + start += l0gpt_sz; > + } > + > + return 0; > +} > + > +static int rmi_init_metadata(void) > +{ > + phys_addr_t start, end; > + const struct memblock_region *r; > + > + for_each_mem_region(r) { > + int ret; > + > + start = memblock_region_memory_base_pfn(r) << PAGE_SHIFT; > + end = memblock_region_memory_end_pfn(r) << PAGE_SHIFT; > + ret = rmi_verify_memory_tracking(start, end); > + if (ret) > + return ret; > + ret = rmi_create_gpts(start, end); > + if (ret) > + return ret; > + } > + > + return 0; > +} > + > +bool rmi_is_available(void) > +{ > + return arm64_rmi_is_available; > +} > + > static int __init arm64_init_rmi(void) > { > /* Continue without realm support if we can't agree on a version */ > @@ -101,6 +199,11 @@ static int __init arm64_init_rmi(void) > > if (rmi_configure()) > return 0; > + if (rmi_init_metadata()) > + return 0; > + > + arm64_rmi_is_available = true; > + pr_info("RMI configured"); > > return 0; > } Thanks, Gavin