From: Julien Thierry <julien.thierry@arm.com> To: James Morse <james.morse@arm.com>, 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, catalin.marinas@arm.com, will.deacon@arm.com, mark.rutland@arm.com, Arnd Bergmann <arnd@arndb.de>, linux-arch@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH v9 01/26] arm64: Fix HCR.TGE status for NMI contexts Date: Mon, 28 Jan 2019 15:42:42 +0000 [thread overview] Message-ID: <847c54ef-ea41-eea5-8aff-72e0cea465f8@arm.com> (raw) In-Reply-To: <8e8c4f5b-5b83-7bbc-1b84-36d68e210968@arm.com> Hi James, On 28/01/2019 11:48, James Morse wrote: > Hi Julien, > > On 21/01/2019 15:33, Julien Thierry wrote: >> When using VHE, the host needs to clear HCR_EL2.TGE bit in order >> to interract with guest TLBs, switching from EL2&0 translation regime > > (interact) > > >> to EL1&0. >> >> However, some non-maskable asynchronous event could happen while TGE is >> cleared like SDEI. Because of this address translation operations >> relying on EL2&0 translation regime could fail (tlb invalidation, >> userspace access, ...). >> >> Fix this by properly setting HCR_EL2.TGE when entering NMI context and >> clear it if necessary when returning to the interrupted context. > > Yes please. This would not have been fun to debug! > > Reviewed-by: James Morse <james.morse@arm.com> > > Thanks. > > I was looking for why we need core code to do this, instead of updating the > arch's call sites. Your 'irqdesc: Add domain handlers for NMIs' patch (pointed > to from the cover letter) is the reason: core-code calls nmi_enter()/nmi_exit() > itself. > Yes, that's the main reason. > >> diff --git a/arch/arm64/include/asm/hardirq.h b/arch/arm64/include/asm/hardirq.h >> index 1473fc2..94b7481 100644 >> --- a/arch/arm64/include/asm/hardirq.h >> +++ b/arch/arm64/include/asm/hardirq.h >> @@ -19,6 +19,7 @@ >> #include <linux/cache.h> >> #include <linux/threads.h> >> #include <asm/irq.h> >> +#include <asm/kvm_arm.h> > > percpu.h? > sysreg.h? > barrier.h? > Good point, I'll add those. Thanks, -- Julien Thierry
WARNING: multiple messages have this Message-ID (diff)
From: Julien Thierry <julien.thierry@arm.com> To: James Morse <james.morse@arm.com>, linux-arm-kernel@lists.infradead.org Cc: mark.rutland@arm.com, linux-arch@vger.kernel.org, daniel.thompson@linaro.org, Arnd Bergmann <arnd@arndb.de>, marc.zyngier@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, stable@vger.kernel.org, christoffer.dall@arm.com, joel@joelfernandes.org Subject: Re: [PATCH v9 01/26] arm64: Fix HCR.TGE status for NMI contexts Date: Mon, 28 Jan 2019 15:42:42 +0000 [thread overview] Message-ID: <847c54ef-ea41-eea5-8aff-72e0cea465f8@arm.com> (raw) In-Reply-To: <8e8c4f5b-5b83-7bbc-1b84-36d68e210968@arm.com> Hi James, On 28/01/2019 11:48, James Morse wrote: > Hi Julien, > > On 21/01/2019 15:33, Julien Thierry wrote: >> When using VHE, the host needs to clear HCR_EL2.TGE bit in order >> to interract with guest TLBs, switching from EL2&0 translation regime > > (interact) > > >> to EL1&0. >> >> However, some non-maskable asynchronous event could happen while TGE is >> cleared like SDEI. Because of this address translation operations >> relying on EL2&0 translation regime could fail (tlb invalidation, >> userspace access, ...). >> >> Fix this by properly setting HCR_EL2.TGE when entering NMI context and >> clear it if necessary when returning to the interrupted context. > > Yes please. This would not have been fun to debug! > > Reviewed-by: James Morse <james.morse@arm.com> > > Thanks. > > I was looking for why we need core code to do this, instead of updating the > arch's call sites. Your 'irqdesc: Add domain handlers for NMIs' patch (pointed > to from the cover letter) is the reason: core-code calls nmi_enter()/nmi_exit() > itself. > Yes, that's the main reason. > >> diff --git a/arch/arm64/include/asm/hardirq.h b/arch/arm64/include/asm/hardirq.h >> index 1473fc2..94b7481 100644 >> --- a/arch/arm64/include/asm/hardirq.h >> +++ b/arch/arm64/include/asm/hardirq.h >> @@ -19,6 +19,7 @@ >> #include <linux/cache.h> >> #include <linux/threads.h> >> #include <asm/irq.h> >> +#include <asm/kvm_arm.h> > > percpu.h? > sysreg.h? > barrier.h? > Good point, I'll add those. Thanks, -- Julien Thierry _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-01-28 15:42 UTC|newest] Thread overview: 166+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-01-21 15:33 [PATCH v9 00/26] arm64: provide pseudo NMI with GICv3 Julien Thierry 2019-01-21 15:33 ` 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 [this message] 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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