From patchwork Wed Nov 15 12:00:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kirill A. Shutemov" X-Patchwork-Id: 165312 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:b909:0:b0:403:3b70:6f57 with SMTP id t9csp2486478vqg; Wed, 15 Nov 2023 04:03:11 -0800 (PST) X-Google-Smtp-Source: AGHT+IHTNh1oUBhFyT2cHPR0iPJWP4KQQrdTrPNV0gHf2Z3Iz+7jN5FS9yctEzjbrXePu5Cm1HNU X-Received: by 2002:a17:903:2012:b0:1cc:482c:bc54 with SMTP id s18-20020a170903201200b001cc482cbc54mr4459398pla.48.1700049791533; Wed, 15 Nov 2023 04:03:11 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1700049791; cv=none; d=google.com; s=arc-20160816; b=gDO2xOR7tODTUjyq0l+XBRkE7M5BEuknph26Ht8pM8NAIydvCKWa1LBSVFVoY1d0RH g5A1pljhiULJ+78EbWSA3+95WoqxzrcjcZkWTDfs+QMSJwvbHLMDPe5h0VKzNl61eE7E Que6BMpffd8rsX0pfG4CQdNuPpTnbCWtnsXJQ0mfgmSb8V9fSAEF3Kew4n7iYgmmLjXz oqDF8NNFzf34WQ1OXboGRaVyFU2aTvZBgn2WZTPysTd6oHXwDiVU4wg97QZiVTwTX6w3 GVtw/VtlxWkggRWglKc1eXGyzHVrsUt0NHdDY9N6UWaTASlvwa5IlNVGZXFUfAPg1Osi hbQw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=JG22zRY1fIJPGxsozXuxpGgaLb4Ec5R8rqmvb7qN/yg=; fh=OvJRnOqsMTm9XoNmEwebcqh9Ud7yh1CTeKAP84ols98=; b=xW9Kfpr3sFrLR9LrWhKhCZkMP5atRms7HZ/ZmV0URJ1fKpfAMClzOc2EKPB16w/cab yGhc5pyyOA2RJA/lZrDFHDxqvYeylbD1nMg403zXVD+8LD/Ti9rhzyaCsiNaliIkwGfb y533y2BFMXt9A3D2Eyw5MyCsug4efKIvnrvHg52hIjnaY/A6KyV8szbMJTcuTU5zPSIi QP8zdlUn85DnAmMLH4IHzAAIqDT8bKVgj3Ej3owl4FSE53WMxGoN+gaxQl4fZYViYsou BdG2+hUVEQDV3pJerH7PAi9yEek0sOWg+Cxux2yQH52GwbzeAL+1Z/13mTMDdqRrSQSw PPpw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=E1yb9hm3; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from snail.vger.email (snail.vger.email. [23.128.96.37]) by mx.google.com with ESMTPS id i14-20020a17090332ce00b001bc079974dbsi10519164plr.355.2023.11.15.04.03.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Nov 2023 04:03:11 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) client-ip=23.128.96.37; Authentication-Results: mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=E1yb9hm3; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by snail.vger.email (Postfix) with ESMTP id C7CA6806CF4D; Wed, 15 Nov 2023 04:01:52 -0800 (PST) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.11 at snail.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343711AbjKOMBc (ORCPT + 28 others); Wed, 15 Nov 2023 07:01:32 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49350 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343698AbjKOMBY (ORCPT ); Wed, 15 Nov 2023 07:01:24 -0500 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 55AB811F for ; Wed, 15 Nov 2023 04:01:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1700049680; x=1731585680; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=I7efoenH6i0/Ag3XkQPziAi2K5WasZRenZtNkZgo4R0=; b=E1yb9hm3nEGWiCodIvj7nQBvhXqvf1+zZF9azpzEw7UvrgeVxKYj4aUg penRZjG1acJkexwwE6QKJd6wVU2eLulqyuBJv8+H5L3847+9yaa01leoB Fh16SrC6v43OUZdG8TuIj4uuYpAd7AhCI/3oB3Po4xvWlFnfWdK9YFFrC 8cBzAyLwJhoziqEpDHUXzIHXr8i1IqeJkyPxIBPgKL5DSTZAlar0IXxNo 6Fl7HYOcdOsqMNe0rGREpT0nDk0G/oyK5BlNR0FxWUHr4sLAu7G0sGqoB nGBXjFnTpUnRi6Fc294FZP9VlveosjB9WS6U1xIQaX7IeToMx/2YSn167 Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10894"; a="394780393" X-IronPort-AV: E=Sophos;i="6.03,304,1694761200"; d="scan'208";a="394780393" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Nov 2023 04:01:19 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.03,304,1694761200"; d="scan'208";a="13160209" Received: from mituomis-mobl.ger.corp.intel.com (HELO box.shutemov.name) ([10.249.44.135]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Nov 2023 04:01:14 -0800 Received: by box.shutemov.name (Postfix, from userid 1000) id 3AE7E109F65; Wed, 15 Nov 2023 15:01:12 +0300 (+03) From: "Kirill A. Shutemov" To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org Cc: "Rafael J. Wysocki" , Peter Zijlstra , Adrian Hunter , Kuppuswamy Sathyanarayanan , Elena Reshetova , Jun Nakajima , Rick Edgecombe , Tom Lendacky , "Kalra, Ashish" , Sean Christopherson , "Huang, Kai" , Baoquan He , kexec@lists.infradead.org, linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [PATCHv3 01/14] x86/acpi: Extract ACPI MADT wakeup code into a separate file Date: Wed, 15 Nov 2023 15:00:31 +0300 Message-ID: <20231115120044.8034-2-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231115120044.8034-1-kirill.shutemov@linux.intel.com> References: <20231115120044.8034-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Wed, 15 Nov 2023 04:01:52 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1782631410565775678 X-GMAIL-MSGID: 1782631410565775678 In order to prepare for the expansion of support for the ACPI MADT wakeup method, move the relevant code into a separate file. Introduce a new configuration option to clearly indicate dependencies without the use of ifdefs. There have been no functional changes. Signed-off-by: Kirill A. Shutemov Reviewed-by: Kuppuswamy Sathyanarayanan Acked-by: Kai Huang --- arch/x86/Kconfig | 7 +++ arch/x86/include/asm/acpi.h | 5 ++ arch/x86/kernel/acpi/Makefile | 11 ++-- arch/x86/kernel/acpi/boot.c | 86 +----------------------------- arch/x86/kernel/acpi/madt_wakeup.c | 81 ++++++++++++++++++++++++++++ 5 files changed, 100 insertions(+), 90 deletions(-) create mode 100644 arch/x86/kernel/acpi/madt_wakeup.c diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 882b11eccbb3..df6c7929b439 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1108,6 +1108,13 @@ config X86_LOCAL_APIC depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI select IRQ_DOMAIN_HIERARCHY +config X86_ACPI_MADT_WAKEUP + def_bool y + depends on X86_64 + depends on ACPI + depends on SMP + depends on X86_LOCAL_APIC + config X86_IO_APIC def_bool y depends on X86_LOCAL_APIC || X86_UP_IOAPIC diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h index c8a7fc23f63c..b536b5a6a57b 100644 --- a/arch/x86/include/asm/acpi.h +++ b/arch/x86/include/asm/acpi.h @@ -73,6 +73,11 @@ static inline bool acpi_skip_set_wakeup_address(void) #define acpi_skip_set_wakeup_address acpi_skip_set_wakeup_address +union acpi_subtable_headers; + +int __init acpi_parse_mp_wake(union acpi_subtable_headers *header, + const unsigned long end); + /* * Check if the CPU can handle C2 and deeper */ diff --git a/arch/x86/kernel/acpi/Makefile b/arch/x86/kernel/acpi/Makefile index fc17b3f136fe..8c7329c88a75 100644 --- a/arch/x86/kernel/acpi/Makefile +++ b/arch/x86/kernel/acpi/Makefile @@ -1,11 +1,12 @@ # SPDX-License-Identifier: GPL-2.0 -obj-$(CONFIG_ACPI) += boot.o -obj-$(CONFIG_ACPI_SLEEP) += sleep.o wakeup_$(BITS).o -obj-$(CONFIG_ACPI_APEI) += apei.o -obj-$(CONFIG_ACPI_CPPC_LIB) += cppc.o +obj-$(CONFIG_ACPI) += boot.o +obj-$(CONFIG_ACPI_SLEEP) += sleep.o wakeup_$(BITS).o +obj-$(CONFIG_ACPI_APEI) += apei.o +obj-$(CONFIG_ACPI_CPPC_LIB) += cppc.o +obj-$(CONFIG_X86_ACPI_MADT_WAKEUP) += madt_wakeup.o ifneq ($(CONFIG_ACPI_PROCESSOR),) -obj-y += cstate.o +obj-y += cstate.o endif diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 1a0dd80d81ac..171d86fe71ef 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -67,13 +67,6 @@ static bool has_lapic_cpus __initdata; static bool acpi_support_online_capable; #endif -#ifdef CONFIG_X86_64 -/* Physical address of the Multiprocessor Wakeup Structure mailbox */ -static u64 acpi_mp_wake_mailbox_paddr; -/* Virtual address of the Multiprocessor Wakeup Structure mailbox */ -static struct acpi_madt_multiproc_wakeup_mailbox *acpi_mp_wake_mailbox; -#endif - #ifdef CONFIG_X86_IO_APIC /* * Locks related to IOAPIC hotplug @@ -369,60 +362,6 @@ acpi_parse_lapic_nmi(union acpi_subtable_headers * header, const unsigned long e return 0; } - -#ifdef CONFIG_X86_64 -static int acpi_wakeup_cpu(u32 apicid, unsigned long start_ip) -{ - /* - * Remap mailbox memory only for the first call to acpi_wakeup_cpu(). - * - * Wakeup of secondary CPUs is fully serialized in the core code. - * No need to protect acpi_mp_wake_mailbox from concurrent accesses. - */ - if (!acpi_mp_wake_mailbox) { - acpi_mp_wake_mailbox = memremap(acpi_mp_wake_mailbox_paddr, - sizeof(*acpi_mp_wake_mailbox), - MEMREMAP_WB); - } - - /* - * Mailbox memory is shared between the firmware and OS. Firmware will - * listen on mailbox command address, and once it receives the wakeup - * command, the CPU associated with the given apicid will be booted. - * - * The value of 'apic_id' and 'wakeup_vector' must be visible to the - * firmware before the wakeup command is visible. smp_store_release() - * ensures ordering and visibility. - */ - acpi_mp_wake_mailbox->apic_id = apicid; - acpi_mp_wake_mailbox->wakeup_vector = start_ip; - smp_store_release(&acpi_mp_wake_mailbox->command, - ACPI_MP_WAKE_COMMAND_WAKEUP); - - /* - * Wait for the CPU to wake up. - * - * The CPU being woken up is essentially in a spin loop waiting to be - * woken up. It should not take long for it wake up and acknowledge by - * zeroing out ->command. - * - * ACPI specification doesn't provide any guidance on how long kernel - * has to wait for a wake up acknowledgement. It also doesn't provide - * a way to cancel a wake up request if it takes too long. - * - * In TDX environment, the VMM has control over how long it takes to - * wake up secondary. It can postpone scheduling secondary vCPU - * indefinitely. Giving up on wake up request and reporting error opens - * possible attack vector for VMM: it can wake up a secondary CPU when - * kernel doesn't expect it. Wait until positive result of the wake up - * request. - */ - while (READ_ONCE(acpi_mp_wake_mailbox->command)) - cpu_relax(); - - return 0; -} -#endif /* CONFIG_X86_64 */ #endif /* CONFIG_X86_LOCAL_APIC */ #ifdef CONFIG_X86_IO_APIC @@ -1159,29 +1098,6 @@ static int __init acpi_parse_madt_lapic_entries(void) } return 0; } - -#ifdef CONFIG_X86_64 -static int __init acpi_parse_mp_wake(union acpi_subtable_headers *header, - const unsigned long end) -{ - struct acpi_madt_multiproc_wakeup *mp_wake; - - if (!IS_ENABLED(CONFIG_SMP)) - return -ENODEV; - - mp_wake = (struct acpi_madt_multiproc_wakeup *)header; - if (BAD_MADT_ENTRY(mp_wake, end)) - return -EINVAL; - - acpi_table_print_madt_entry(&header->common); - - acpi_mp_wake_mailbox_paddr = mp_wake->base_address; - - apic_update_callback(wakeup_secondary_cpu_64, acpi_wakeup_cpu); - - return 0; -} -#endif /* CONFIG_X86_64 */ #endif /* CONFIG_X86_LOCAL_APIC */ #ifdef CONFIG_X86_IO_APIC @@ -1378,7 +1294,7 @@ static void __init acpi_process_madt(void) smp_found_config = 1; } -#ifdef CONFIG_X86_64 +#ifdef CONFIG_X86_ACPI_MADT_WAKEUP /* * Parse MADT MP Wake entry. */ diff --git a/arch/x86/kernel/acpi/madt_wakeup.c b/arch/x86/kernel/acpi/madt_wakeup.c new file mode 100644 index 000000000000..f4be492b7e4c --- /dev/null +++ b/arch/x86/kernel/acpi/madt_wakeup.c @@ -0,0 +1,81 @@ +#include +#include +#include +#include +#include + +/* Physical address of the Multiprocessor Wakeup Structure mailbox */ +static u64 acpi_mp_wake_mailbox_paddr; + +/* Virtual address of the Multiprocessor Wakeup Structure mailbox */ +static struct acpi_madt_multiproc_wakeup_mailbox *acpi_mp_wake_mailbox; + +static int acpi_wakeup_cpu(u32 apicid, unsigned long start_ip) +{ + /* + * Remap mailbox memory only for the first call to acpi_wakeup_cpu(). + * + * Wakeup of secondary CPUs is fully serialized in the core code. + * No need to protect acpi_mp_wake_mailbox from concurrent accesses. + */ + if (!acpi_mp_wake_mailbox) { + acpi_mp_wake_mailbox = memremap(acpi_mp_wake_mailbox_paddr, + sizeof(*acpi_mp_wake_mailbox), + MEMREMAP_WB); + } + + /* + * Mailbox memory is shared between the firmware and OS. Firmware will + * listen on mailbox command address, and once it receives the wakeup + * command, the CPU associated with the given apicid will be booted. + * + * The value of 'apic_id' and 'wakeup_vector' must be visible to the + * firmware before the wakeup command is visible. smp_store_release() + * ensures ordering and visibility. + */ + acpi_mp_wake_mailbox->apic_id = apicid; + acpi_mp_wake_mailbox->wakeup_vector = start_ip; + smp_store_release(&acpi_mp_wake_mailbox->command, + ACPI_MP_WAKE_COMMAND_WAKEUP); + + /* + * Wait for the CPU to wake up. + * + * The CPU being woken up is essentially in a spin loop waiting to be + * woken up. It should not take long for it wake up and acknowledge by + * zeroing out ->command. + * + * ACPI specification doesn't provide any guidance on how long kernel + * has to wait for a wake up acknowledgement. It also doesn't provide + * a way to cancel a wake up request if it takes too long. + * + * In TDX environment, the VMM has control over how long it takes to + * wake up secondary. It can postpone scheduling secondary vCPU + * indefinitely. Giving up on wake up request and reporting error opens + * possible attack vector for VMM: it can wake up a secondary CPU when + * kernel doesn't expect it. Wait until positive result of the wake up + * request. + */ + while (READ_ONCE(acpi_mp_wake_mailbox->command)) + cpu_relax(); + + return 0; +} + +int __init acpi_parse_mp_wake(union acpi_subtable_headers *header, + const unsigned long end) +{ + struct acpi_madt_multiproc_wakeup *mp_wake; + + mp_wake = (struct acpi_madt_multiproc_wakeup *)header; + if (BAD_MADT_ENTRY(mp_wake, end)) + return -EINVAL; + + acpi_table_print_madt_entry(&header->common); + + acpi_mp_wake_mailbox_paddr = mp_wake->base_address; + + apic_update_callback(wakeup_secondary_cpu_64, acpi_wakeup_cpu); + + return 0; +}