From: Julien Thierry <julien.thierry@arm.com> To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, daniel.thompson@linaro.org, joel@joelfernandes.org, marc.zyngier@arm.com, christoffer.dall@arm.com, james.morse@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, mark.rutland@arm.com, Julien Thierry <julien.thierry@arm.com> Subject: [PATCH v9 00/26] arm64: provide pseudo NMI with GICv3 Date: Mon, 21 Jan 2019 15:33:19 +0000 [thread overview] Message-ID: <1548084825-8803-1-git-send-email-julien.thierry@arm.com> (raw) Hi, This series is a continuation of the work started by Daniel [1]. The goal is to use GICv3 interrupt priorities to simulate an NMI. The patches depend on the core API for NMIs patches [2]. Both series can be found on this branch: git clone http://linux-arm.org/linux-jt.git -b v5.0-pseudo-nmi To achieve this, set two priorities, one for standard interrupts and another, higher priority, for NMIs. Whenever we want to disable interrupts, we mask the standard priority instead so NMIs can still be raised. Some corner cases though still require to actually mask all interrupts effectively disabling the NMI. Daniel Thompson ran some benchmarks [3] on a previous version showing a small (<1%) performance drop when using interrupt priorities on Cortex-A53 and GIC-500. Currently, only PPIs and SPIs can be set as NMIs. IPIs being currently hardcoded IRQ numbers, there isn't a generic interface to set SGIs as NMI for now. LPIs being controlled by the ITS cannot be delivered as NMI. When an NMI is active on a CPU, no other NMI can be triggered on the CPU. Requirements to use this: - Have GICv3 - SCR_EL3.FIQ is set to 1 when linux runs or have single security state - Select Kernel Feature -> Support for NMI-like interrupts - Provide "enable_pseudo_nmi" on the kernel command line * Patch 1 fixes an existing issue with current NMI contexts in arm64 * Patches 2 and 3 are just a bit of cleanup * Patch 4 introduces a CPU feature to check if priority masking should be used * Patches 5 and 6 add the support for priority masking in GICv3 driver * Patches 7 to 13 add the support for priority masking the arch/arm64 code * Patches 14 and 15 allow us to apply alternatives earlier in the boot process * Patches 16 to 18 starts the PMR masking on cpu startup and provides primitives for arm64 GICv3 driver to perform priority masking * Patches 19 to 22 Add support for pseudo-NMIs in GICv3 driver * Patches 23 to 25 Add support for receiving NMIs in arch/arm64 * Patch 26 adds the build config and command line option to enable pseudo-NMIs Changes since v8[4]: * Rebase on v5.0-rc3 * Add Acked-by and Reviewed-by tags * Simplify arch_local_save_flags code * Fix issue in cpufeature when enabling early alternatives [1] http://www.spinics.net/lists/arm-kernel/msg525077.html [2] https://lkml.org/lkml/2018/11/12/2113 [3] https://lkml.org/lkml/2018/7/20/803 [4] https://lkml.org/lkml/2019/1/8/456 Cheers, Julien --> Daniel Thompson (1): arm64: alternative: Apply alternatives early in boot process Julien Thierry (25): arm64: Fix HCR.TGE status for NMI contexts arm64: Remove unused daif related functions/macros arm64: cpufeature: Set SYSREG_GIC_CPUIF as a boot system feature arm64: cpufeature: Add cpufeature for IRQ priority masking arm/arm64: gic-v3: Add PMR and RPR accessors irqchip/gic-v3: Switch to PMR masking before calling IRQ handler arm64: ptrace: Provide definitions for PMR values arm64: Make PMR part of task context arm64: Unmask PMR before going idle arm64: kvm: Unmask PMR before entering guest efi: Let architectures decide the flags that should be saved/restored arm64: irqflags: Use ICC_PMR_EL1 for interrupt masking arm64: daifflags: Include PMR in daifflags restore operations arm64: alternative: Allow alternative status checking per cpufeature irqchip/gic-v3: Factor group0 detection into functions arm64: Switch to PMR masking when starting CPUs arm64: gic-v3: Implement arch support for priority masking irqchip/gic-v3: Detect if GIC can support pseudo-NMIs irqchip/gic-v3: Handle pseudo-NMIs irqchip/gic: Add functions to access irq priorities irqchip/gic-v3: Allow interrupts to be set as pseudo-NMI arm64: Handle serror in NMI context arm64: Skip preemption when exiting an NMI arm64: Skip irqflags tracing for NMI in IRQs disabled context arm64: Enable the support of pseudo-NMIs Documentation/admin-guide/kernel-parameters.txt | 6 + Documentation/arm64/booting.txt | 5 + arch/arm/include/asm/arch_gicv3.h | 33 ++++ arch/arm64/Kconfig | 14 ++ arch/arm64/include/asm/alternative.h | 4 +- arch/arm64/include/asm/arch_gicv3.h | 32 +++ arch/arm64/include/asm/assembler.h | 10 +- arch/arm64/include/asm/cpucaps.h | 3 +- arch/arm64/include/asm/cpufeature.h | 10 + arch/arm64/include/asm/daifflags.h | 41 ++-- arch/arm64/include/asm/efi.h | 6 + arch/arm64/include/asm/hardirq.h | 28 +++ arch/arm64/include/asm/irqflags.h | 104 +++++++--- arch/arm64/include/asm/kvm_host.h | 12 ++ arch/arm64/include/asm/processor.h | 3 + arch/arm64/include/asm/ptrace.h | 26 ++- arch/arm64/kernel/alternative.c | 60 +++++- arch/arm64/kernel/asm-offsets.c | 1 + arch/arm64/kernel/cpufeature.c | 42 +++- arch/arm64/kernel/entry.S | 43 ++++ arch/arm64/kernel/irq.c | 3 + arch/arm64/kernel/process.c | 51 +++++ arch/arm64/kernel/smp.c | 33 ++++ arch/arm64/kernel/traps.c | 8 +- arch/arm64/kvm/hyp/switch.c | 16 ++ arch/arm64/mm/proc.S | 11 -- drivers/firmware/efi/runtime-wrappers.c | 17 +- drivers/irqchip/irq-gic-common.c | 10 + drivers/irqchip/irq-gic-common.h | 2 + drivers/irqchip/irq-gic-v3.c | 252 +++++++++++++++++++++--- include/linux/efi.h | 5 +- include/linux/hardirq.h | 7 + 32 files changed, 783 insertions(+), 115 deletions(-) -- 1.9.1
WARNING: multiple messages have this Message-ID (diff)
From: Julien Thierry <julien.thierry@arm.com> To: linux-arm-kernel@lists.infradead.org Cc: mark.rutland@arm.com, daniel.thompson@linaro.org, Julien Thierry <julien.thierry@arm.com>, marc.zyngier@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, christoffer.dall@arm.com, james.morse@arm.com, joel@joelfernandes.org Subject: [PATCH v9 00/26] arm64: provide pseudo NMI with GICv3 Date: Mon, 21 Jan 2019 15:33:19 +0000 [thread overview] Message-ID: <1548084825-8803-1-git-send-email-julien.thierry@arm.com> (raw) Hi, This series is a continuation of the work started by Daniel [1]. The goal is to use GICv3 interrupt priorities to simulate an NMI. The patches depend on the core API for NMIs patches [2]. Both series can be found on this branch: git clone http://linux-arm.org/linux-jt.git -b v5.0-pseudo-nmi To achieve this, set two priorities, one for standard interrupts and another, higher priority, for NMIs. Whenever we want to disable interrupts, we mask the standard priority instead so NMIs can still be raised. Some corner cases though still require to actually mask all interrupts effectively disabling the NMI. Daniel Thompson ran some benchmarks [3] on a previous version showing a small (<1%) performance drop when using interrupt priorities on Cortex-A53 and GIC-500. Currently, only PPIs and SPIs can be set as NMIs. IPIs being currently hardcoded IRQ numbers, there isn't a generic interface to set SGIs as NMI for now. LPIs being controlled by the ITS cannot be delivered as NMI. When an NMI is active on a CPU, no other NMI can be triggered on the CPU. Requirements to use this: - Have GICv3 - SCR_EL3.FIQ is set to 1 when linux runs or have single security state - Select Kernel Feature -> Support for NMI-like interrupts - Provide "enable_pseudo_nmi" on the kernel command line * Patch 1 fixes an existing issue with current NMI contexts in arm64 * Patches 2 and 3 are just a bit of cleanup * Patch 4 introduces a CPU feature to check if priority masking should be used * Patches 5 and 6 add the support for priority masking in GICv3 driver * Patches 7 to 13 add the support for priority masking the arch/arm64 code * Patches 14 and 15 allow us to apply alternatives earlier in the boot process * Patches 16 to 18 starts the PMR masking on cpu startup and provides primitives for arm64 GICv3 driver to perform priority masking * Patches 19 to 22 Add support for pseudo-NMIs in GICv3 driver * Patches 23 to 25 Add support for receiving NMIs in arch/arm64 * Patch 26 adds the build config and command line option to enable pseudo-NMIs Changes since v8[4]: * Rebase on v5.0-rc3 * Add Acked-by and Reviewed-by tags * Simplify arch_local_save_flags code * Fix issue in cpufeature when enabling early alternatives [1] http://www.spinics.net/lists/arm-kernel/msg525077.html [2] https://lkml.org/lkml/2018/11/12/2113 [3] https://lkml.org/lkml/2018/7/20/803 [4] https://lkml.org/lkml/2019/1/8/456 Cheers, Julien --> Daniel Thompson (1): arm64: alternative: Apply alternatives early in boot process Julien Thierry (25): arm64: Fix HCR.TGE status for NMI contexts arm64: Remove unused daif related functions/macros arm64: cpufeature: Set SYSREG_GIC_CPUIF as a boot system feature arm64: cpufeature: Add cpufeature for IRQ priority masking arm/arm64: gic-v3: Add PMR and RPR accessors irqchip/gic-v3: Switch to PMR masking before calling IRQ handler arm64: ptrace: Provide definitions for PMR values arm64: Make PMR part of task context arm64: Unmask PMR before going idle arm64: kvm: Unmask PMR before entering guest efi: Let architectures decide the flags that should be saved/restored arm64: irqflags: Use ICC_PMR_EL1 for interrupt masking arm64: daifflags: Include PMR in daifflags restore operations arm64: alternative: Allow alternative status checking per cpufeature irqchip/gic-v3: Factor group0 detection into functions arm64: Switch to PMR masking when starting CPUs arm64: gic-v3: Implement arch support for priority masking irqchip/gic-v3: Detect if GIC can support pseudo-NMIs irqchip/gic-v3: Handle pseudo-NMIs irqchip/gic: Add functions to access irq priorities irqchip/gic-v3: Allow interrupts to be set as pseudo-NMI arm64: Handle serror in NMI context arm64: Skip preemption when exiting an NMI arm64: Skip irqflags tracing for NMI in IRQs disabled context arm64: Enable the support of pseudo-NMIs Documentation/admin-guide/kernel-parameters.txt | 6 + Documentation/arm64/booting.txt | 5 + arch/arm/include/asm/arch_gicv3.h | 33 ++++ arch/arm64/Kconfig | 14 ++ arch/arm64/include/asm/alternative.h | 4 +- arch/arm64/include/asm/arch_gicv3.h | 32 +++ arch/arm64/include/asm/assembler.h | 10 +- arch/arm64/include/asm/cpucaps.h | 3 +- arch/arm64/include/asm/cpufeature.h | 10 + arch/arm64/include/asm/daifflags.h | 41 ++-- arch/arm64/include/asm/efi.h | 6 + arch/arm64/include/asm/hardirq.h | 28 +++ arch/arm64/include/asm/irqflags.h | 104 +++++++--- arch/arm64/include/asm/kvm_host.h | 12 ++ arch/arm64/include/asm/processor.h | 3 + arch/arm64/include/asm/ptrace.h | 26 ++- arch/arm64/kernel/alternative.c | 60 +++++- arch/arm64/kernel/asm-offsets.c | 1 + arch/arm64/kernel/cpufeature.c | 42 +++- arch/arm64/kernel/entry.S | 43 ++++ arch/arm64/kernel/irq.c | 3 + arch/arm64/kernel/process.c | 51 +++++ arch/arm64/kernel/smp.c | 33 ++++ arch/arm64/kernel/traps.c | 8 +- arch/arm64/kvm/hyp/switch.c | 16 ++ arch/arm64/mm/proc.S | 11 -- drivers/firmware/efi/runtime-wrappers.c | 17 +- drivers/irqchip/irq-gic-common.c | 10 + drivers/irqchip/irq-gic-common.h | 2 + drivers/irqchip/irq-gic-v3.c | 252 +++++++++++++++++++++--- include/linux/efi.h | 5 +- include/linux/hardirq.h | 7 + 32 files changed, 783 insertions(+), 115 deletions(-) -- 1.9.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2019-01-21 15:34 UTC|newest] Thread overview: 166+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-01-21 15:33 Julien Thierry [this message] 2019-01-21 15:33 ` [PATCH v9 00/26] arm64: provide pseudo NMI with GICv3 Julien Thierry 2019-01-21 15:33 ` [PATCH v9 01/26] arm64: Fix HCR.TGE status for NMI contexts Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-23 22:57 ` Sasha Levin 2019-01-23 22:57 ` Sasha Levin 2019-01-28 11:48 ` James Morse 2019-01-28 11:48 ` James Morse 2019-01-28 15:42 ` Julien Thierry 2019-01-28 15:42 ` Julien Thierry 2019-01-31 8:19 ` Christoffer Dall 2019-01-31 8:19 ` Christoffer Dall 2019-01-31 8:56 ` Julien Thierry 2019-01-31 8:56 ` Julien Thierry 2019-01-31 9:27 ` Christoffer Dall 2019-01-31 9:27 ` Christoffer Dall 2019-01-31 9:40 ` Julien Thierry 2019-01-31 9:40 ` Julien Thierry 2019-01-31 9:48 ` Christoffer Dall 2019-01-31 9:48 ` Christoffer Dall 2019-01-31 9:53 ` Marc Zyngier 2019-01-31 9:53 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 02/26] arm64: Remove unused daif related functions/macros Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 9:21 ` Marc Zyngier 2019-01-28 9:21 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 03/26] arm64: cpufeature: Set SYSREG_GIC_CPUIF as a boot system feature Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 9:22 ` Marc Zyngier 2019-01-28 9:22 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 04/26] arm64: cpufeature: Add cpufeature for IRQ priority masking Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 9:24 ` Marc Zyngier 2019-01-28 9:24 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 05/26] arm/arm64: gic-v3: Add PMR and RPR accessors Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 9:25 ` Marc Zyngier 2019-01-28 9:25 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 06/26] irqchip/gic-v3: Switch to PMR masking before calling IRQ handler Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 9:30 ` Marc Zyngier 2019-01-28 9:30 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 07/26] arm64: ptrace: Provide definitions for PMR values Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 9:37 ` Marc Zyngier 2019-01-28 9:37 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 08/26] arm64: Make PMR part of task context Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 9:42 ` Marc Zyngier 2019-01-28 9:42 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 09/26] arm64: Unmask PMR before going idle Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-22 15:23 ` Catalin Marinas 2019-01-22 15:23 ` Catalin Marinas 2019-01-22 20:18 ` Ard Biesheuvel 2019-01-22 20:18 ` Ard Biesheuvel 2019-01-23 8:56 ` Julien Thierry 2019-01-23 8:56 ` Julien Thierry 2019-01-23 9:38 ` Ard Biesheuvel 2019-01-23 9:38 ` Ard Biesheuvel 2019-01-28 9:44 ` Marc Zyngier 2019-01-28 9:44 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 10/26] arm64: kvm: Unmask PMR before entering guest Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 9:58 ` Marc Zyngier 2019-01-28 9:58 ` Marc Zyngier 2019-01-28 9:58 ` Marc Zyngier 2019-01-30 12:07 ` Christoffer Dall 2019-01-30 12:07 ` Christoffer Dall 2019-01-30 14:58 ` Julien Thierry 2019-01-30 14:58 ` Julien Thierry 2019-01-21 15:33 ` [PATCH v9 11/26] efi: Let architectures decide the flags that should be saved/restored Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-21 15:42 ` Ard Biesheuvel 2019-01-21 15:42 ` Ard Biesheuvel 2019-01-23 9:04 ` Julien Thierry 2019-01-23 9:04 ` Julien Thierry 2019-01-28 10:00 ` Marc Zyngier 2019-01-28 10:00 ` Marc Zyngier 2019-01-28 10:00 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 12/26] arm64: irqflags: Use ICC_PMR_EL1 for interrupt masking Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-21 15:45 ` Ard Biesheuvel 2019-01-21 15:45 ` Ard Biesheuvel 2019-01-21 18:05 ` Julien Thierry 2019-01-21 18:05 ` Julien Thierry 2019-01-22 15:21 ` Catalin Marinas 2019-01-22 15:21 ` Catalin Marinas 2019-01-23 10:44 ` Julien Thierry 2019-01-23 10:44 ` Julien Thierry 2019-01-30 11:52 ` Julien Thierry 2019-01-30 11:52 ` Julien Thierry 2019-01-21 15:33 ` [PATCH v9 13/26] arm64: daifflags: Include PMR in daifflags restore operations Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 10:37 ` Marc Zyngier 2019-01-28 10:37 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 14/26] arm64: alternative: Allow alternative status checking per cpufeature Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 11:00 ` Marc Zyngier 2019-01-28 11:00 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 15/26] arm64: alternative: Apply alternatives early in boot process Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 11:17 ` Marc Zyngier 2019-01-28 11:17 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 16/26] irqchip/gic-v3: Factor group0 detection into functions Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 11:19 ` Marc Zyngier 2019-01-28 11:19 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 17/26] arm64: Switch to PMR masking when starting CPUs Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 11:21 ` Marc Zyngier 2019-01-28 11:21 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 18/26] arm64: gic-v3: Implement arch support for priority masking Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 11:23 ` Marc Zyngier 2019-01-28 11:23 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 19/26] irqchip/gic-v3: Detect if GIC can support pseudo-NMIs Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 11:39 ` Marc Zyngier 2019-01-28 11:39 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 20/26] irqchip/gic-v3: Handle pseudo-NMIs Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 11:59 ` Marc Zyngier 2019-01-28 11:59 ` Marc Zyngier 2019-01-29 11:33 ` Julien Thierry 2019-01-29 11:33 ` Julien Thierry 2019-01-29 12:31 ` Marc Zyngier 2019-01-29 12:31 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 21/26] irqchip/gic: Add functions to access irq priorities Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 12:04 ` Marc Zyngier 2019-01-28 12:04 ` Marc Zyngier 2019-01-29 11:36 ` Julien Thierry 2019-01-29 11:36 ` Julien Thierry 2019-01-21 15:33 ` [PATCH v9 22/26] irqchip/gic-v3: Allow interrupts to be set as pseudo-NMI Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-26 10:19 ` liwei (GF) 2019-01-26 10:19 ` liwei (GF) 2019-01-26 10:41 ` Marc Zyngier 2019-01-26 10:41 ` Marc Zyngier 2019-01-28 8:57 ` Julien Thierry 2019-01-28 8:57 ` Julien Thierry 2019-01-28 13:59 ` liwei (GF) 2019-01-28 13:59 ` liwei (GF) 2019-01-28 14:49 ` Julien Thierry 2019-01-28 14:49 ` Julien Thierry 2019-01-28 12:08 ` Marc Zyngier 2019-01-28 12:08 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 23/26] arm64: Handle serror in NMI context Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 12:26 ` Marc Zyngier 2019-01-28 12:26 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 24/26] arm64: Skip preemption when exiting an NMI Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 12:34 ` Marc Zyngier 2019-01-28 12:34 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 25/26] arm64: Skip irqflags tracing for NMI in IRQs disabled context Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 12:40 ` Marc Zyngier 2019-01-28 12:40 ` Marc Zyngier 2019-01-21 15:33 ` [PATCH v9 26/26] arm64: Enable the support of pseudo-NMIs Julien Thierry 2019-01-21 15:33 ` Julien Thierry 2019-01-28 12:47 ` Marc Zyngier 2019-01-28 12:47 ` Marc Zyngier 2019-01-30 13:46 ` Julien Thierry 2019-01-30 13:46 ` Julien Thierry
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