From: Marc Zyngier <maz@kernel.org>
To: Mark Brown <broonie@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Lorenzo Pieralisi <lpieralisi@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Sami Mujawar <Sami.Mujawar@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev
Subject: Re: [PATCH v2 06/14] arm64/hyp-stub: Enable access to ALLINT
Date: Mon, 05 Dec 2022 17:50:35 +0000 [thread overview]
Message-ID: <86sfhtloyc.wl-maz@kernel.org> (raw)
In-Reply-To: <20221112151708.175147-7-broonie@kernel.org>
On Sat, 12 Nov 2022 15:17:00 +0000,
Mark Brown <broonie@kernel.org> wrote:
>
> In order to use NMIs we need to ensure that traps are disabled for it so
> update HCRX_EL2 to ensure that TALLINT is not set when we detect support
> for NMIs.
>
> Signed-off-by: Mark Brown <broonie@kernel.org>
> ---
> arch/arm64/kernel/hyp-stub.S | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/arch/arm64/kernel/hyp-stub.S b/arch/arm64/kernel/hyp-stub.S
> index 2ee18c860f2a..4e0b06467973 100644
> --- a/arch/arm64/kernel/hyp-stub.S
> +++ b/arch/arm64/kernel/hyp-stub.S
> @@ -151,6 +151,18 @@ SYM_CODE_START_LOCAL(__finalise_el2)
>
> .Lskip_sme:
>
> + // NMIs
> + __check_override id_aa64pfr1 ID_AA64PFR1_EL1_NMI_SHIFT 4 .Linit_nmi .Lskip_nmi
Err.., What makes sure that x1 contains id_aa64pfr1_el1, as per the
big fat warning at the beginning of the file?? If you have SME, x1
will contain some other junk... Really, this must be written as:
check_override id_aa64pfr1 ID_AA64PFR1_EL1_NMI_SHIFT .Linit_nmi .Lskip_nmi
> +.Linit_nmi:
> + mrs x1, id_aa64mmfr1_el1 // HCRX_EL2 present?
> + ubfx x1, x1, #ID_AA64MMFR1_EL1_HCX_SHIFT, #4
> + cbz x1, .Lskip_nmi
> +
> + mrs_s x1, SYS_HCRX_EL2
> + and x1, x1, #~HCRX_EL2_TALLINT_MASK // Don't trap ALLINT
A nicer way of writing this is:
bic x1, x1, #HCRX_EL2_TALLINT_MASK
M.
--
Without deviation from the norm, progress is not possible.
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next prev parent reply other threads:[~2022-12-05 17:51 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-12 15:16 [PATCH v2 00/14] arm64/nmi: Support for FEAT_NMI Mark Brown
2022-11-12 15:16 ` [PATCH v2 01/14] arm64/booting: Document boot requirements " Mark Brown
2022-11-12 15:16 ` [PATCH v2 02/14] arm64/sysreg: Add definition for ICC_NMIAR1_EL1 Mark Brown
2022-11-12 15:16 ` [PATCH v2 03/14] arm64/sysreg: Add definition of ISR_EL1 Mark Brown
2022-12-05 16:45 ` Marc Zyngier
2022-11-12 15:16 ` [PATCH v2 04/14] arm64/sysreg: Add definitions for immediate versions of MSR ALLINT Mark Brown
2022-12-05 16:38 ` Marc Zyngier
2022-12-05 17:11 ` Mark Brown
2022-12-07 19:18 ` Marc Zyngier
2022-12-07 19:42 ` Mark Brown
2022-11-12 15:16 ` [PATCH v2 05/14] arm64/asm: Introduce assembly macros for managing ALLINT Mark Brown
2022-12-05 17:29 ` Marc Zyngier
2022-12-05 18:24 ` Mark Brown
2022-12-07 19:14 ` Marc Zyngier
2022-11-12 15:17 ` [PATCH v2 06/14] arm64/hyp-stub: Enable access to ALLINT Mark Brown
2022-12-05 17:50 ` Marc Zyngier [this message]
2022-11-12 15:17 ` [PATCH v2 07/14] arm64/idreg: Add an override for FEAT_NMI Mark Brown
2022-11-12 15:17 ` [PATCH v2 08/14] arm64/cpufeature: Detect PE support " Mark Brown
2022-12-05 18:03 ` Marc Zyngier
2022-12-05 19:32 ` Mark Brown
2022-12-07 19:06 ` Marc Zyngier
2022-11-12 15:17 ` [PATCH v2 09/14] KVM: arm64: Hide FEAT_NMI from guests Mark Brown
2022-12-05 18:06 ` Marc Zyngier
2022-12-05 19:03 ` Mark Brown
2022-12-07 19:03 ` Marc Zyngier
2022-12-07 19:33 ` Mark Brown
2022-11-12 15:17 ` [PATCH v2 10/14] arm64/nmi: Manage masking for superpriority interrupts along with DAIF Mark Brown
2022-12-05 18:47 ` Marc Zyngier
2022-12-05 20:52 ` Mark Brown
2022-12-08 17:19 ` Lorenzo Pieralisi
2022-12-12 14:03 ` Mark Brown
2022-12-13 8:37 ` Lorenzo Pieralisi
2022-12-13 13:15 ` Mark Brown
2022-12-15 13:32 ` Marc Zyngier
2022-12-12 14:40 ` Mark Rutland
2022-12-15 13:21 ` Mark Brown
2022-11-12 15:17 ` [PATCH v2 11/14] arm64/irq: Document handling of FEAT_NMI in irqflags.h Mark Brown
2022-11-12 15:17 ` [PATCH v2 12/14] arm64/nmi: Add handling of superpriority interrupts as NMIs Mark Brown
2022-12-07 11:03 ` Marc Zyngier
2022-12-07 13:24 ` Mark Brown
2022-12-07 18:57 ` Marc Zyngier
2022-12-07 19:15 ` Mark Brown
2022-11-12 15:17 ` [PATCH v2 13/14] arm64/nmi: Add Kconfig for NMI Mark Brown
2022-11-12 15:17 ` [PATCH v2 14/14] irqchip/gic-v3: Implement FEAT_GICv3_NMI support Mark Brown
2022-12-07 15:20 ` Marc Zyngier
2022-12-02 18:42 ` [PATCH v2 00/14] arm64/nmi: Support for FEAT_NMI Marc Zyngier
2022-12-03 8:25 ` Lorenzo Pieralisi
2022-12-03 9:45 ` Marc Zyngier
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