From nobody Thu Dec 18 20:22:32 2025 Received: from smtp-fw-2101.amazon.com (smtp-fw-2101.amazon.com [72.21.196.25]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D168420A5FC for ; Wed, 4 Dec 2024 14:20:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=72.21.196.25 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733322018; cv=none; b=KFhCy5r1LU2W81naL8hF0pY4LOsFgWpFkvQut4oAlWMLZDtVH4e3DP2r6ieZOLdlTrZzXrpmGq9+x2roZ55BbMaoaa7JYRIwmafuHb0C9+xWZH3w1dyCyKIF6ZkaqIcxtnxe5NKJSUy8BzPfOZ9JRzPOlclBvlwdZUiSIwQvdM8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733322018; c=relaxed/simple; bh=xJZCT/GjiDu8RA3CjqyLcWpYYIqPznqRrMjagUMcs18=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=W3DXzgJcgnzUOv+lcUszQL8ijxYCScWu4Mvhb7SEprSfI1yZgsvLePS+3/Xgu1RYtBfeaC6KITq564E6WzwS1toPs7SF2sM9Uy+UdhKW4ZrkPNnahEnoOzIbiSXLbMohMrPOgj7JrTYSCxUc17xZj30e6z+l+7WdKDhb97x/fwY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com; spf=pass smtp.mailfrom=amazon.com; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b=LQAi0dLe; arc=none smtp.client-ip=72.21.196.25 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=amazon.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="LQAi0dLe" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1733322018; x=1764858018; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=S1AhySqT4pJxQzL6Bs9QeBO73gCqFnu+5rMGSzQjSew=; b=LQAi0dLeUjZ2rSr4w4+Qlo871gZSGTN8vEi1nxoFxTQs3EurpJtjioST DebR0DDV1oqDWWFiPqxiu8X+QvoR0PYrOGTrKvACUBjOV4b2qmeZP4isj 30t/AlWCf7SzKyQwADVME4d8HLjMNzWe8AU7At3dr3SttvTz/34h6/cCC g=; X-IronPort-AV: E=Sophos;i="6.12,207,1728950400"; d="scan'208";a="448083499" Received: from iad6-co-svc-p1-lb1-vlan3.amazon.com (HELO smtpout.prod.us-west-2.prod.farcaster.email.amazon.dev) ([10.124.125.6]) by smtp-border-fw-2101.iad2.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Dec 2024 14:20:08 +0000 Received: from EX19MTAUWB002.ant.amazon.com [10.0.21.151:50300] by smtpin.naws.us-west-2.prod.farcaster.email.amazon.dev [10.0.31.190:2525] with esmtp (Farcaster) id 791171cc-77a9-4386-9fcb-ee54dd886ad0; Wed, 4 Dec 2024 14:20:06 +0000 (UTC) X-Farcaster-Flow-ID: 791171cc-77a9-4386-9fcb-ee54dd886ad0 Received: from EX19D013UWA002.ant.amazon.com (10.13.138.210) by EX19MTAUWB002.ant.amazon.com (10.250.64.231) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.34; Wed, 4 Dec 2024 14:20:04 +0000 Received: from EX19MTAUWA001.ant.amazon.com (10.250.64.204) by EX19D013UWA002.ant.amazon.com (10.13.138.210) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.34; Wed, 4 Dec 2024 14:20:04 +0000 Received: from email-imr-corp-prod-iad-all-1b-af42e9ba.us-east-1.amazon.com (10.25.36.214) by mail-relay.amazon.com (10.250.64.204) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.34 via Frontend Transport; Wed, 4 Dec 2024 14:20:04 +0000 Received: from dev-dsk-farbere-1a-46ecabed.eu-west-1.amazon.com (dev-dsk-farbere-1a-46ecabed.eu-west-1.amazon.com [172.19.116.181]) by email-imr-corp-prod-iad-all-1b-af42e9ba.us-east-1.amazon.com (Postfix) with ESMTP id DCA6442966; Wed, 4 Dec 2024 14:20:03 +0000 (UTC) Received: by dev-dsk-farbere-1a-46ecabed.eu-west-1.amazon.com (Postfix, from userid 14301484) id 9C3477592; Wed, 4 Dec 2024 14:20:03 +0000 (UTC) From: Eliav Farber To: , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [PATCH v6 1/2] kexec: Consolidate machine_kexec_mask_interrupts() implementation Date: Wed, 4 Dec 2024 14:20:02 +0000 Message-ID: <20241204142003.32859-2-farbere@amazon.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20241204142003.32859-1-farbere@amazon.com> References: <20241204142003.32859-1-farbere@amazon.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Consolidate the machine_kexec_mask_interrupts implementation into a common function located in a new file: kernel/irq/kexec.c. This removes duplicate implementations from architecture-specific files in arch/arm, arch/arm64, arch/powerpc, and arch/riscv, reducing code duplication and improving maintainability. The new implementation retains architecture-specific behavior for CONFIG_GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD, which was previously implemented for ARM64. When enabled (currently for ARM64), it clears the active state of interrupts forwarded to virtual machines (VMs) before handling other interrupt masking operations. Signed-off-by: Eliav Farber --- V5 -> V6: - Change GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD to not be user selectable. arch/arm/kernel/machine_kexec.c | 23 ------------------ arch/arm64/Kconfig | 1 + arch/arm64/kernel/machine_kexec.c | 31 ------------------------ arch/powerpc/include/asm/kexec.h | 1 - arch/powerpc/kexec/core.c | 22 ----------------- arch/powerpc/kexec/core_32.c | 1 + arch/riscv/kernel/machine_kexec.c | 23 ------------------ include/linux/irq.h | 3 +++ kernel/irq/Kconfig | 6 +++++ kernel/irq/Makefile | 2 +- kernel/irq/kexec.c | 40 +++++++++++++++++++++++++++++++ 11 files changed, 52 insertions(+), 101 deletions(-) create mode 100644 kernel/irq/kexec.c diff --git a/arch/arm/kernel/machine_kexec.c b/arch/arm/kernel/machine_kexe= c.c index 80ceb5bd2680..dd430477e7c1 100644 --- a/arch/arm/kernel/machine_kexec.c +++ b/arch/arm/kernel/machine_kexec.c @@ -127,29 +127,6 @@ void crash_smp_send_stop(void) cpus_stopped =3D 1; } =20 -static void machine_kexec_mask_interrupts(void) -{ - unsigned int i; - struct irq_desc *desc; - - for_each_irq_desc(i, desc) { - struct irq_chip *chip; - - chip =3D irq_desc_get_chip(desc); - if (!chip) - continue; - - if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data)) - chip->irq_eoi(&desc->irq_data); - - if (chip->irq_mask) - chip->irq_mask(&desc->irq_data); - - if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data)) - chip->irq_disable(&desc->irq_data); - } -} - void machine_crash_shutdown(struct pt_regs *regs) { local_irq_disable(); diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 100570a048c5..dcc3551cf6c2 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -149,6 +149,7 @@ config ARM64 select GENERIC_IDLE_POLL_SETUP select GENERIC_IOREMAP select GENERIC_IRQ_IPI + select GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD select GENERIC_IRQ_PROBE select GENERIC_IRQ_SHOW select GENERIC_IRQ_SHOW_LEVEL diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_= kexec.c index 82e2203d86a3..6f121a0164a4 100644 --- a/arch/arm64/kernel/machine_kexec.c +++ b/arch/arm64/kernel/machine_kexec.c @@ -207,37 +207,6 @@ void machine_kexec(struct kimage *kimage) BUG(); /* Should never get here. */ } =20 -static void machine_kexec_mask_interrupts(void) -{ - unsigned int i; - struct irq_desc *desc; - - for_each_irq_desc(i, desc) { - struct irq_chip *chip; - int ret; - - chip =3D irq_desc_get_chip(desc); - if (!chip) - continue; - - /* - * First try to remove the active state. If this - * fails, try to EOI the interrupt. - */ - ret =3D irq_set_irqchip_state(i, IRQCHIP_STATE_ACTIVE, false); - - if (ret && irqd_irq_inprogress(&desc->irq_data) && - chip->irq_eoi) - chip->irq_eoi(&desc->irq_data); - - if (chip->irq_mask) - chip->irq_mask(&desc->irq_data); - - if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data)) - chip->irq_disable(&desc->irq_data); - } -} - /** * machine_crash_shutdown - shutdown non-crashing cpus and save registers */ diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/ke= xec.h index 270ee93a0f7d..601e569303e1 100644 --- a/arch/powerpc/include/asm/kexec.h +++ b/arch/powerpc/include/asm/kexec.h @@ -61,7 +61,6 @@ struct pt_regs; extern void kexec_smp_wait(void); /* get and clear naca physid, wait for master to copy new code to 0 */ extern void default_machine_kexec(struct kimage *image); -extern void machine_kexec_mask_interrupts(void); =20 void relocate_new_kernel(unsigned long indirection_page, unsigned long reb= oot_code_buffer, unsigned long start_address) __noreturn; diff --git a/arch/powerpc/kexec/core.c b/arch/powerpc/kexec/core.c index b8333a49ea5d..58a930a47422 100644 --- a/arch/powerpc/kexec/core.c +++ b/arch/powerpc/kexec/core.c @@ -22,28 +22,6 @@ #include #include =20 -void machine_kexec_mask_interrupts(void) { - unsigned int i; - struct irq_desc *desc; - - for_each_irq_desc(i, desc) { - struct irq_chip *chip; - - chip =3D irq_desc_get_chip(desc); - if (!chip) - continue; - - if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data)) - chip->irq_eoi(&desc->irq_data); - - if (chip->irq_mask) - chip->irq_mask(&desc->irq_data); - - if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data)) - chip->irq_disable(&desc->irq_data); - } -} - #ifdef CONFIG_CRASH_DUMP void machine_crash_shutdown(struct pt_regs *regs) { diff --git a/arch/powerpc/kexec/core_32.c b/arch/powerpc/kexec/core_32.c index c95f96850c9e..deb28eb44f30 100644 --- a/arch/powerpc/kexec/core_32.c +++ b/arch/powerpc/kexec/core_32.c @@ -7,6 +7,7 @@ * Copyright (C) 2005 IBM Corporation. */ =20 +#include #include #include #include diff --git a/arch/riscv/kernel/machine_kexec.c b/arch/riscv/kernel/machine_= kexec.c index 3c830a6f7ef4..2306ce3e5f22 100644 --- a/arch/riscv/kernel/machine_kexec.c +++ b/arch/riscv/kernel/machine_kexec.c @@ -114,29 +114,6 @@ void machine_shutdown(void) #endif } =20 -static void machine_kexec_mask_interrupts(void) -{ - unsigned int i; - struct irq_desc *desc; - - for_each_irq_desc(i, desc) { - struct irq_chip *chip; - - chip =3D irq_desc_get_chip(desc); - if (!chip) - continue; - - if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data)) - chip->irq_eoi(&desc->irq_data); - - if (chip->irq_mask) - chip->irq_mask(&desc->irq_data); - - if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data)) - chip->irq_disable(&desc->irq_data); - } -} - /* * machine_crash_shutdown - Prepare to kexec after a kernel crash * diff --git a/include/linux/irq.h b/include/linux/irq.h index fa711f80957b..25f51bf3c351 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -694,6 +694,9 @@ extern int irq_chip_request_resources_parent(struct irq= _data *data); extern void irq_chip_release_resources_parent(struct irq_data *data); #endif =20 +/* Disable or mask interrupts during a kernel kexec */ +extern void machine_kexec_mask_interrupts(void); + /* Handling of unhandled and spurious interrupts: */ extern void note_interrupt(struct irq_desc *desc, irqreturn_t action_ret); =20 diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig index 529adb1f5859..875f25ed6f71 100644 --- a/kernel/irq/Kconfig +++ b/kernel/irq/Kconfig @@ -141,6 +141,12 @@ config GENERIC_IRQ_DEBUGFS =20 If you don't know what to do here, say N. =20 +# Clear forwarded VM interrupts during kexec. +# This option ensures the kernel clears active states for interrupts +# forwarded to virtual machines (VMs) during a machine kexec. +config GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD + bool + endmenu =20 config GENERIC_IRQ_MULTI_HANDLER diff --git a/kernel/irq/Makefile b/kernel/irq/Makefile index f19d3080bf11..c0f44c06d69d 100644 --- a/kernel/irq/Makefile +++ b/kernel/irq/Makefile @@ -1,6 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 =20 -obj-y :=3D irqdesc.o handle.o manage.o spurious.o resend.o chip.o dummychi= p.o devres.o +obj-y :=3D irqdesc.o handle.o manage.o spurious.o resend.o chip.o dummychi= p.o devres.o kexec.o obj-$(CONFIG_IRQ_TIMINGS) +=3D timings.o ifeq ($(CONFIG_TEST_IRQ_TIMINGS),y) CFLAGS_timings.o +=3D -DDEBUG diff --git a/kernel/irq/kexec.c b/kernel/irq/kexec.c new file mode 100644 index 000000000000..0f9548c1708d --- /dev/null +++ b/kernel/irq/kexec.c @@ -0,0 +1,40 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include + +#include "internals.h" + +void machine_kexec_mask_interrupts(void) +{ + struct irq_desc *desc; + unsigned int i; + + for_each_irq_desc(i, desc) { + struct irq_chip *chip; + int check_eoi =3D 1; + + chip =3D irq_desc_get_chip(desc); + if (!chip) + continue; + + if (IS_ENABLED(CONFIG_GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD)) { + /* + * First try to remove the active state from an interrupt which is forw= arded + * to a VM. If the interrupt is not forwarded, try to EOI the interrupt. + */ + check_eoi =3D irq_set_irqchip_state(i, IRQCHIP_STATE_ACTIVE, false); + } + + if (check_eoi && chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data)) + chip->irq_eoi(&desc->irq_data); + + if (chip->irq_mask) + chip->irq_mask(&desc->irq_data); + + if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data)) + chip->irq_disable(&desc->irq_data); + } +} --=20 2.40.1 From nobody Thu Dec 18 20:22:32 2025 Received: from smtp-fw-52004.amazon.com (smtp-fw-52004.amazon.com [52.119.213.154]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1B7571F8AC4 for ; Wed, 4 Dec 2024 14:20:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=52.119.213.154 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733322013; cv=none; b=BxuM+DuTbvuPsAKF99DPfqP1lobIxekV6i3vXWhTotRUeTcci3zI7yxYyt9DrGjcVyVknixyQhCcnkcJsDv2K5QubCADyiqES3o9MnqpUdko97Xj2/id3eII0YmHi615s/s+qmi6NEbfDsDSQKYk0S9QB3miNapxyGUXajPTtag= ARC-Message-Signature: i=1; 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charset="utf-8" During machine kexec, the function machine_kexec_mask_interrupts() is responsible for disabling or masking all interrupts. While the irq_disable hook ensures that an already-disabled IRQ is not disabled again, the current implementation unconditionally invokes the irq_mask() function for every interrupt descriptor, even when the interrupt is already masked. A specific issue was observed in the crash kernel flow after unbinding a device (prior to kexec) that used a GPIO as an IRQ source. The warning was triggered by the gpiochip_disable_irq() function, which attempted to clear the FLAG_IRQ_IS_ENABLED flag when FLAG_USED_AS_IRQ was not set: ``` void gpiochip_disable_irq(struct gpio_chip *gc, unsigned int offset) { struct gpio_desc *desc =3D gpiochip_get_desc(gc, offset); if (!IS_ERR(desc) && !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags))) clear_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); } ``` This issue surfaced after commit a8173820f441 ("gpio: gpiolib: Allow GPIO IRQs to lazy disable") introduced lazy disablement for GPIO IRQs. It replaced disable/enable hooks with mask/unmask hooks. Unlike the disable hook, the mask hook doesn't handle already-masked IRQs. When a GPIO-IRQ driver is unbound, the IRQ is released, triggering __irq_disable() and irq_state_set_masked(). A subsequent call to machine_kexec_mask_interrupts() re-invokes chip->irq_mask(). This results in a call chain, including gpiochip_irq_mask() and gpiochip_disable_irq(). Since FLAG_USED_AS_IRQ was cleared earlier, a warning occurs. Replace calls to irq_mask() and irq_disable() hooks with a simplified call to irq_shutdown(), and check if the interrupt is started (irqd_is_started) before calling the shutdown. Signed-off-by: Eliav Farber --- V5 -> V6: No changes. kernel/irq/kexec.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/kernel/irq/kexec.c b/kernel/irq/kexec.c index 0f9548c1708d..1a3deffe6b5b 100644 --- a/kernel/irq/kexec.c +++ b/kernel/irq/kexec.c @@ -17,7 +17,7 @@ void machine_kexec_mask_interrupts(void) int check_eoi =3D 1; =20 chip =3D irq_desc_get_chip(desc); - if (!chip) + if (!chip || !irqd_is_started(&desc->irq_data)) continue; =20 if (IS_ENABLED(CONFIG_GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD)) { @@ -31,10 +31,6 @@ void machine_kexec_mask_interrupts(void) if (check_eoi && chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data)) chip->irq_eoi(&desc->irq_data); =20 - if (chip->irq_mask) - chip->irq_mask(&desc->irq_data); - - if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data)) - chip->irq_disable(&desc->irq_data); + irq_shutdown(desc); } } --=20 2.40.1