From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from phobos.denx.de (phobos.denx.de [85.214.62.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9F16DC4332F for ; Fri, 14 Oct 2022 10:38:43 +0000 (UTC) Received: from h2850616.stratoserver.net (localhost [IPv6:::1]) by phobos.denx.de (Postfix) with ESMTP id 7BE5684D60; Fri, 14 Oct 2022 12:38:41 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de Received: by phobos.denx.de (Postfix, from userid 109) id E420C84D57; Fri, 14 Oct 2022 12:38:39 +0200 (CEST) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by phobos.denx.de (Postfix) with ESMTP id 6E2D284D57 for ; Fri, 14 Oct 2022 12:38:35 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=abdellatif.elkhlifi@arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B4F4513D5; Fri, 14 Oct 2022 03:38:40 -0700 (PDT) Received: from e121910.cambridge.arm.com (unknown [10.57.2.187]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 03C323F67D; Fri, 14 Oct 2022 03:38:32 -0700 (PDT) Date: Fri, 14 Oct 2022 11:38:28 +0100 From: Abdellatif El Khlifi To: Ilias Apalodimas Cc: u-boot@lists.denx.de, nd@arm.com Subject: Re: [PATCH v5 09/10] arm_ffa: introduce FF-A MM communication Message-ID: <20221014103828.GA18079@e121910.cambridge.arm.com> References: <20220926101723.9965-1-abdellatif.elkhlifi@arm.com> <20220926140827.15125-1-abdellatif.elkhlifi@arm.com> <20220926140827.15125-10-abdellatif.elkhlifi@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.6 at phobos.denx.de X-Virus-Status: Clean On Thu, Sep 29, 2022 at 12:32:42PM +0300, Ilias Apalodimas wrote: > Hi Abdellatif, > > > --- a/arch/arm/cpu/armv8/cache.S > > +++ b/arch/arm/cpu/armv8/cache.S > > @@ -3,6 +3,9 @@ > > * (C) Copyright 2013 > > * David Feng > > * > > + * (C) Copyright 2022 ARM Limited > > + * Abdellatif El Khlifi > > + * > > * This file is based on sample code from ARMv8 ARM. > > */ > > > > @@ -21,7 +24,11 @@ > > * x1: 0 clean & invalidate, 1 invalidate only > > * x2~x9: clobbered > > */ > > +#ifdef CONFIG_EFI_LOADER > > +.pushsection .text.efi_runtime, "ax" > > Maybe we discussed this in the past and I forgot, but why would you need > __asm_dcache_level, __asm_dcache_all, __asm_invalidate_dcache_alla etc in > the runtime section ? Because cache invalidation needs to be done at ffa_mm_communicate() level (v4 patchset). That code is runtime compatible so all the called functions must be under .text.efi_runtime However, since we agreed to drop EFI runtime support from the patchset, v6 patchset takes care of that. > > > +#else > > .pushsection .text.__asm_dcache_level, "ax" > > +#endif > > ENTRY(__asm_dcache_level) > > lsl x12, x0, #1 > > msr csselr_el1, x12 /* select cache level */ > > @@ -65,7 +72,11 @@ ENDPROC(__asm_dcache_level) > > * > > * flush or invalidate all data cache by SET/WAY. > > */ > > +#ifdef CONFIG_EFI_LOADER > > +.pushsection .text.efi_runtime, "ax" > > +#else > > .pushsection .text.__asm_dcache_all, "ax" > > +#endif > > ENTRY(__asm_dcache_all) > > mov x1, x0 > > dsb sy > > @@ -109,7 +120,11 @@ ENTRY(__asm_flush_dcache_all) > > ENDPROC(__asm_flush_dcache_all) > > .popsection > > > > +#ifdef CONFIG_EFI_LOADER > > +.pushsection .text.efi_runtime, "ax" > > +#else > > .pushsection .text.__asm_invalidate_dcache_all, "ax" > > +#endif > > ENTRY(__asm_invalidate_dcache_all) > > mov x0, #0x1 > > b __asm_dcache_all > > @@ -182,7 +197,11 @@ ENTRY(__asm_invalidate_icache_all) > > ENDPROC(__asm_invalidate_icache_all) > > .popsection > > > > +#ifdef CONFIG_EFI_LOADER > > +.pushsection .text.efi_runtime, "ax" > > +#else > > .pushsection .text.__asm_invalidate_l3_dcache, "ax" > > +#endif > > WEAK(__asm_invalidate_l3_dcache) > > mov x0, #0 /* return status as success */ > > ret > > diff --git a/arch/arm/cpu/armv8/cache_v8.c b/arch/arm/cpu/armv8/cache_v8.c > > index e4736e5643..45f57372c2 100644 > > --- a/arch/arm/cpu/armv8/cache_v8.c > > +++ b/arch/arm/cpu/armv8/cache_v8.c > > @@ -5,10 +5,14 @@ > > * > > * (C) Copyright 2016 > > * Alexander Graf > > + * > > + * (C) Copyright 2022 ARM Limited > > + * Abdellatif El Khlifi > > */ > > > > #include > > #include > > +#include > > #include > > #include > > #include > > @@ -445,7 +449,7 @@ __weak void mmu_setup(void) > > /* > > * Performs a invalidation of the entire data cache at all levels > > */ > > -void invalidate_dcache_all(void) > > +void __efi_runtime invalidate_dcache_all(void) > > { > > __asm_invalidate_dcache_all(); > > __asm_invalidate_l3_dcache(); > > diff --git a/include/mm_communication.h b/include/mm_communication.h > > index e65fbde60d..fe9104c56d 100644 > > --- a/include/mm_communication.h > > [...] > > > * always begin with efi_mm_communicate_header. > > */ > > -struct __packed efi_mm_communicate_header { > > +struct efi_mm_communicate_header { > > efi_guid_t header_guid; > > size_t message_len; > > u8 data[]; > > @@ -145,7 +150,7 @@ struct smm_variable_communicate_header { > > * Defined in EDK2 as SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE. > > * > > */ > > -struct smm_variable_access { > > +struct __packed smm_variable_access { > > You are randomly adding and deleting __packed cwin both structs. But you can't do that. > Those structs are defined in StandAloneMM. This is the reason each struct > description has the corresponding EDK2 definition. Thanks for the comment. However, we are not setting randomly the __packed keyword. There is a good reason for that. It has been explained before in this reply [1]. Basically it's because of data padding issues breaking the communication between u-boot and secure world (Optee). When upgrading Optee to v3.18, no issues anymore. The __packed changes have been dropped in patchset v6. [1]: https://lore.kernel.org/all/20220926105620.GA22382@e121910.cambridge.arm.com/ > > > efi_guid_t guid; > > efi_uintn_t data_size; > > efi_uintn_t name_size; > > diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig > > index b8fb2701a7..d292f57244 100644 > > --- a/lib/efi_loader/Kconfig > > +++ b/lib/efi_loader/Kconfig > > @@ -61,13 +61,23 @@ config EFI_VARIABLE_FILE_STORE > > stored as file /ubootefi.var on the EFI system partition. > > > > config EFI_MM_COMM_TEE > > - bool "UEFI variables storage service via OP-TEE" > > - depends on OPTEE > > + bool "UEFI variables storage service via the trusted world" > > + depends on OPTEE || ARM_FFA_TRANSPORT > > I think we discussed this in the past. I don't want ifdefs in the code for > that. FF-A is a discoverable bus. So I think what we should do here, is > fire up the variable access driver -> probe for FF-A -> decide what to use. > > So it looks something like > ************************** > **** Variable Driver ***** > ************************** > | > | > | > *************************** > ****** Discover FF-A ****** > *************************** > | | > | yes | No > | | > > Use SP Use OP-TEE In patchset v6, FF-A discovery is done at runtime and on demand. In our case at the MM Variable Driver as you recommended. Thanks. > > > help > > + Allowing access to the MM SP services (SPs such as StandAlonneMM, smm-gateway). > > + When using the u-boot OP-TEE driver, StandAlonneMM is supported. > > + When using the u-boot FF-A driver any MM SP is supported. > > + > > If OP-TEE is present and running StandAloneMM, dispatch all UEFI > > variable related operations to that. The application will verify, > > authenticate and store the variables on an RPMB. > > > > + When ARM_FFA_TRANSPORT is used, dispatch all UEFI variable related > > + operations to the MM SP running in the secure world. > > + A door bell mechanism is used to notify the SP when there is data in the shared > > + MM buffer. The data is copied by u-boot to the shared buffer before issuing > > + the door bell event. > > + > > config EFI_VARIABLE_NO_STORE > > bool "Don't persist non-volatile UEFI variables" > > help > > diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c > > index d404343a7d..8a397ea21b 100644 > > --- a/lib/efi_loader/efi_boottime.c > > +++ b/lib/efi_loader/efi_boottime.c > > @@ -2193,6 +2193,13 @@ static efi_status_t EFIAPI efi_exit_boot_services(efi_handle_t image_handle, > > debug("[efi_boottime][INFO]: FF-A RX/TX buffers unmapped\n"); > > #endif > > > > +#if CONFIG_IS_ENABLED(ARM_FFA_EFI_RUNTIME_MODE) && !CONFIG_IS_ENABLED(SANDBOX_FFA) > > + if (ffa_copy_runtime_data()) > > + printf("ERROR: EFI: FFA: copying runtime data\n"); > > + else > > + printf("INFO: EFI: FFA: runtime data copied\n"); > > +#endif > > + > > /* Patch out unsupported runtime function */ > > efi_runtime_detach(); > > > > diff --git a/lib/efi_loader/efi_variable_tee.c b/lib/efi_loader/efi_variable_tee.c > > index dfef18435d..d6f24f85bd 100644 > > --- a/lib/efi_loader/efi_variable_tee.c > > +++ b/lib/efi_loader/efi_variable_tee.c > > @@ -4,6 +4,8 @@ > > * > > * Copyright (C) 2019 Linaro Ltd. > > * Copyright (C) 2019 Linaro Ltd. > > + * Copyright (C) 2022 ARM Limited > > + * Abdellatif El Khlifi > > */ > > > > #include > > @@ -15,6 +17,36 @@ > > #include > > #include > > > > +#if (IS_ENABLED(CONFIG_ARM_FFA_TRANSPORT)) > > + > > +#include > > +#include > > +#include > > + > > +#ifndef FFA_SHARED_MM_BUFFER_SIZE > > +#warning "FFA_SHARED_MM_BUFFER_SIZE must be defined in include/configs/.h" > > +#define FFA_SHARED_MM_BUFFER_SIZE 0 > > +#endif > > + > > +#ifndef FFA_SHARED_MM_BUFFER_OFFSET > > +#warning "FFA_SHARED_MM_BUFFER_OFFSET must be defined in include/configs/.h" > > +#define FFA_SHARED_MM_BUFFER_OFFSET 0 > > +#endif > > + > > +#ifndef FFA_SHARED_MM_BUFFER_ADDR > > +#warning "FFA_SHARED_MM_BUFFER_ADDR must be defined in include/configs/.h" > > +#define FFA_SHARED_MM_BUFFER_ADDR 0 > > +#endif > > + > > +/* MM return codes */ > > +#define MM_SUCCESS (0) > > + > > +const char *mm_sp_svc_uuid = MM_SP_UUID; > > + > > +static __efi_runtime_data u16 mm_sp_id; > > + > > +#endif > > + > > extern struct efi_var_file __efi_runtime_data *efi_var_buf; > > static efi_uintn_t max_buffer_size; /* comm + var + func + data */ > > static efi_uintn_t max_payload_size; /* func + data */ > > @@ -24,6 +56,7 @@ struct mm_connection { > > u32 session; > > }; > > > > +#if (IS_ENABLED(CONFIG_OPTEE)) > > /** > > * get_connection() - Retrieve OP-TEE session for a specific UUID. > > * > > @@ -143,16 +176,227 @@ static efi_status_t optee_mm_communicate(void *comm_buf, ulong dsize) > > > > return ret; > > } > > +#endif > > + > > +#if (IS_ENABLED(CONFIG_ARM_FFA_TRANSPORT)) > > > > /** > > - * mm_communicate() - Adjust the cmonnucation buffer to StandAlonneMM and send > > + * ffa_notify_mm_sp() - Announce there is data in the shared buffer > > + * > > + * Notifies the MM partition in the trusted world that > > + * data is available in the shared buffer. > > + * This is a blocking call during which trusted world has exclusive access > > + * to the MM shared buffer. > > + * > > + * Return: > > + * > > + * 0 on success > > + */ > > +static int __efi_runtime ffa_notify_mm_sp(void) > > +{ > > + struct ffa_send_direct_data msg = {0}; > > + int ret; > > + int sp_event_ret = -1; > > + > > + if (!ffa_bus_ops_get()) > > + return -EINVAL; > > + > > + msg.data0 = FFA_SHARED_MM_BUFFER_OFFSET; /* x3 */ > > + > > + ret = ffa_bus_ops_get()->sync_send_receive(mm_sp_id, &msg); > > + if (ret != 0) > > + return ret; > > + > > + sp_event_ret = msg.data0; /* x3 */ > > + > > + if (sp_event_ret == MM_SUCCESS) > > + return 0; > > + > > + /* > > + * Failure to notify the MM SP > > + */ > > + > > + return -EACCES; > > +} > > + > > +/** > > + * ffa_discover_mm_sp_id() - Query the MM partition ID > > + * > > + * Use the FF-A driver to get the MM partition ID. > > + * If multiple partitions are found, use the first one. > > + * This is a boot time function. > > + * > > + * Return: > > + * > > + * 0 on success > > + */ > > +static int ffa_discover_mm_sp_id(void) > > +{ > > + u32 count = 0, size = 0; > > + int ret; > > + struct ffa_partition_info *parts_info; > > + > > + if (!ffa_bus_ops_get()) > > + return -EINVAL; > > + > > + /* > > + * get from the driver the count of the SPs matching the UUID > > + */ > > + ret = ffa_bus_ops_get()->partition_info_get(mm_sp_svc_uuid, &count, NULL); > > + if (ret != 0) { > > + log_err("EFI: Failure in querying partitions count (error code: %d)\n", ret); > > + return ret; > > + } > > + > > + if (!count) { > > + log_info("EFI: No MM partition found\n"); > > + return ret; > > + } > > + > > + /* > > + * pre-allocate a buffer to be filled by the driver > > + * with ffa_partition_info structs > > + */ > > + > > + log_info("EFI: Pre-allocating %d partition(s) info structures\n", count); > > + > > + parts_info = calloc(count, sizeof(struct ffa_partition_info)); > > + if (!parts_info) > > + return -EINVAL; > > + > > + size = count * sizeof(struct ffa_partition_info); > > + > > + /* > > + * ask the driver to fill the > > + * buffer with the SPs info > > + */ > > + ret = ffa_bus_ops_get()->partition_info_get(mm_sp_svc_uuid, &size, parts_info); > > + if (ret != 0) { > > + log_err("EFI: Failure in querying partition(s) info (error code: %d)\n", ret); > > + free(parts_info); > > + return ret; > > + } > > + > > + /* > > + * MM SPs found , use the first one > > + */ > > + > > + mm_sp_id = parts_info[0].id; > > + > > + log_info("EFI: MM partition ID 0x%x\n", mm_sp_id); > > + > > + free(parts_info); > > + > > + return 0; > > +} > > + > > +/** > > + * ffa_mm_communicate() - Exchange EFI services data with the MM partition using FF-A > > + * @comm_buf: locally allocated communication buffer used for rx/tx > > + * @dsize: communication buffer size > > + * > > + * Issues a door bell event to notify the MM partition (SP) running in OP-TEE > > + * that there is data to read from the shared buffer. > > + * Communication with the MM SP is performed using FF-A transport. > > + * On the event, MM SP can read the data from the buffer and > > + * update the MM shared buffer with response data. > > + * The response data is copied back to the communication buffer. > > + * > > + * Return: > > + * > > + * EFI status code > > + */ > > +static efi_status_t __efi_runtime ffa_mm_communicate(void *comm_buf, ulong comm_buf_size) > > +{ > > If you are registering this as a *runtime* service you should also tweak > the RT_PROPERTIES TABLE and enable runtime services (e.g SetVariable). > Otherwise having as runtime makes little sense. To be honest I'd much > prefer this whole patchset without the runtime parts. It's much easier to > review and reason about and we can always add runtime later. EFI runtime support removed from the FF-A work in patchset v6. > > > + ulong tx_data_size; > > + int ffa_ret; > > + struct efi_mm_communicate_header *mm_hdr; > > + void *virt_shared_buf; > > + > > + if (!comm_buf) > > + return EFI_INVALID_PARAMETER; > > + > > + /* Discover MM partition ID at boot time */ > > + if (!mm_sp_id && ffa_discover_mm_sp_id() != 0) { > > + log_err("EFI: Failure to discover MM partition ID at boot time\n"); > > + return EFI_UNSUPPORTED; > > + } > > + > > + mm_hdr = (struct efi_mm_communicate_header *)comm_buf; > > + tx_data_size = mm_hdr->message_len + sizeof(efi_guid_t) + sizeof(size_t); > > + > > + if (comm_buf_size != tx_data_size || tx_data_size > FFA_SHARED_MM_BUFFER_SIZE) > > + return EFI_INVALID_PARAMETER; > > + > > + /* Copy the data to the shared buffer */ > > + > > + virt_shared_buf = (void *)map_sysmem((phys_addr_t)FFA_SHARED_MM_BUFFER_ADDR, 0); > > + efi_memcpy_runtime(virt_shared_buf, comm_buf, tx_data_size); > > + > > + /* > > + * The secure world might have cache disabled for > > + * the device region used for shared buffer (which is the case for Optee). > > + * In this case, the secure world reads the data from DRAM. > > + * Let's flush the cache so the DRAM is updated with the latest data. > > + */ > > + #ifdef CONFIG_ARM64 > > + invalidate_dcache_all(); > > + #endif > > + > > + /* Announce there is data in the shared buffer */ > > + > > + ffa_ret = ffa_notify_mm_sp(); > > + if (ffa_ret) > > + unmap_sysmem(virt_shared_buf); > > + > > + switch (ffa_ret) { > > + case 0: > > + { > > + ulong rx_data_size; > > + /* Copy the MM SP response from the shared buffer to the communication buffer */ > > + rx_data_size = ((struct efi_mm_communicate_header *)virt_shared_buf)->message_len + > > + sizeof(efi_guid_t) + > > + sizeof(size_t); > > + > > + if (rx_data_size > comm_buf_size) { > > + unmap_sysmem(virt_shared_buf); > > + return EFI_OUT_OF_RESOURCES; > > + } > > + > > + efi_memcpy_runtime(comm_buf, virt_shared_buf, rx_data_size); > > + unmap_sysmem(virt_shared_buf); > > + > > + return EFI_SUCCESS; > > + } > > + case -EINVAL: > > + return EFI_DEVICE_ERROR; > > + case -EPERM: > > + return EFI_INVALID_PARAMETER; > > + case -EACCES: > > + return EFI_ACCESS_DENIED; > > + case -EBUSY: > > + return EFI_OUT_OF_RESOURCES; > > + default: > > + return EFI_ACCESS_DENIED; > > + } > > +} > > +#endif > > + > > +/** > > + * mm_communicate() - Adjust the communication buffer to the MM SP and send > > * it to OP-TEE > > * > > - * @comm_buf: locally allocted communcation buffer > > + * @comm_buf: locally allocated communication buffer > > * @dsize: buffer size > > + * > > + * The MM SP (also called partition) can be StandAlonneMM or smm-gateway. > > + * The comm_buf format is the same for both partitions. > > + * When using the u-boot OP-TEE driver, StandAlonneMM is supported. > > + * When using the u-boot FF-A driver, StandAlonneMM and smm-gateway are supported. > > + * > > * Return: status code > > */ > > -static efi_status_t mm_communicate(u8 *comm_buf, efi_uintn_t dsize) > > +static efi_status_t __efi_runtime mm_communicate(u8 *comm_buf, efi_uintn_t dsize) > > The optee version of the function can't be on the efi_runtime section. The > reason is that almost the entire of the OP-TEE subsystem is not marked as > runtime, which will lead to a crash if we ever take that path. > > > { > > efi_status_t ret; > > struct efi_mm_communicate_header *mm_hdr; > > @@ -162,7 +406,11 @@ static efi_status_t mm_communicate(u8 *comm_buf, efi_uintn_t dsize) > > mm_hdr = (struct efi_mm_communicate_header *)comm_buf; > > var_hdr = (struct smm_variable_communicate_header *)mm_hdr->data; > > > > + #if (IS_ENABLED(CONFIG_OPTEE)) > > ret = optee_mm_communicate(comm_buf, dsize); > > + #elif (IS_ENABLED(CONFIG_ARM_FFA_TRANSPORT)) > > + ret = ffa_mm_communicate(comm_buf, dsize); > > If we enable runtime discovery of optee vs ffa, we can get rid of that and > just pass an extra argument to mm_communicate > > Thanks > /Ilias > > + #endif > > if (ret != EFI_SUCCESS) { > > log_err("%s failed!\n", __func__); > > return ret; > > @@ -258,6 +506,13 @@ efi_status_t EFIAPI get_max_payload(efi_uintn_t *size) > > goto out; > > } > > *size = var_payload->size; > > + > > + #if (IS_ENABLED(CONFIG_ARM_FFA_TRANSPORT)) > > + if (*size > FFA_SHARED_MM_BUFFER_SIZE) > > + *size = FFA_SHARED_MM_BUFFER_SIZE - MM_COMMUNICATE_HEADER_SIZE - > > + MM_VARIABLE_COMMUNICATE_SIZE; > > + #endif > > + > > /* > > * There seems to be a bug in EDK2 miscalculating the boundaries and > > * size checks, so deduct 2 more bytes to fulfill this requirement. Fix > > @@ -697,7 +952,7 @@ void efi_variables_boot_exit_notify(void) > > ret = EFI_NOT_FOUND; > > > > if (ret != EFI_SUCCESS) > > - log_err("Unable to notify StMM for ExitBootServices\n"); > > + log_err("Unable to notify the MM partition for ExitBootServices\n"); > > free(comm_buf); > > > > /* > > -- > > 2.17.1 > >