Re: [PATCH v3 1/1] irqchip/gic-v4.1: Disable vSGI upon (GIC CPUIF < v4.1) detection
From: Marc Zyngier <maz@kernel.org>
Date: 2021-03-17 14:05:36
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Hi Lorenzo, Wed, 17 Mar 2021 10:07:19 +0000, Lorenzo Pieralisi [off-list ref] wrote:
GIC CPU interfaces versions predating GIC v4.1 were not built to accommodate vINTID within the vSGI range; as reported in the GIC specifications (8.2 "Changes to the CPU interface"), it is CONSTRAINED UNPREDICTABLE to deliver a vSGI to a PE with ID_AA64PFR0_EL1.GIC < b0011. Check the GIC CPUIF version by reading the SYS_ID_AA64_PFR0_EL1. Disable vSGIs if a CPUIF version < 4.1 is detected to prevent using vSGIs on systems where they may misbehave. Signed-off-by: Lorenzo Pieralisi <redacted> Cc: Marc Zyngier <maz@kernel.org>
Does it need to go in as a fix? or can it just be pushed into 5.13? Given that there is no such HW in the wild just yet, I'm inclined to do the latter... Thanks, M. -- Without deviation from the norm, progress is not possible. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel