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X-Proofpoint-ORIG-GUID: eU--bn2vXkzHVp00PtVaPdWAx_U_ju3U X-Proofpoint-Spam-Info: AW1haW4tMjYwODI5MDE3NSBTYWx0ZWRfXx244W+sV2C1f qTnIFKuazKsAl19YNcshqAyiKxSAJL9k0QP9dGn1TV897S9xxcZMbLWF/GVH1VuQjOKI8prDRnl z2b36wLmjoS42Mvqbv/mF7e5H1nVaYpHHriTH3x97RyIhLXEMRXs Hi Greg/Sasha, On 20/08/26 8:26 pm, Greg Kroah-Hartman wrote: > 6.12-stable review patch. If anyone has any objections, please let me know. > > ------------------ > > From: Jon Hunter > > [ Upstream commit a7c28483fd57dd0e1487024af70622315320774b ] > > Commit d87773de9efe ("clocksource/drivers/arm_arch_timer: Default to EL2 > virtual timer when running VHE") updated the ARM arch timer driver to > use the virtual timer by default if the CPU is running at EL2 with VHE > enabled. If the CPU is running at EL2 with VHE enabled but there is no > interrupt provided for the virtual timer, then the following warning is > displayed: > > arch_timer: [Firmware Bug]: VHE-capable CPU without EL2 virtual timer > interrupt > > This warning is observed on Tegra194 platforms. Tegra194 SoC includes > NVIDIA Carmel ARM v8.2 CPUs and support an EL2 virtual timer. Fix the > above warning by adding the PPI for the EL2 virtual timer interrupt for > Tegra194. > > Fixes: 5425fb15d8ee ("arm64: tegra: Add Tegra194 chip device tree") > Signed-off-by: Jon Hunter > Signed-off-by: Thierry Reding > Signed-off-by: Sasha Levin > --- > arch/arm64/boot/dts/nvidia/tegra194.dtsi | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/arm64/boot/dts/nvidia/tegra194.dtsi b/arch/arm64/boot/dts/nvidia/tegra194.dtsi > index c369507747851..45d0606bd5444 100644 > --- a/arch/arm64/boot/dts/nvidia/tegra194.dtsi > +++ b/arch/arm64/boot/dts/nvidia/tegra194.dtsi > @@ -3161,6 +3161,8 @@ timer { > (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>, > + (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>, > + (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>; I ran an AI-assisted backport review and then checked a70b2fbe03d0 against the 6.12.y timer driver. The patch adds Tegra194's fifth timer interrupt, PPI 15, but 6.12.y still selects the timer as follows: if (is_kernel_in_hyp_mode()) return ARCH_TIMER_HYP_PPI; Upstream a7c28483fd57 follows d87773de9efe ("clocksource/drivers/arm_arch_timer: Default to EL2 virtual timer when running VHE"). That earlier commit selects ARCH_TIMER_HYP_VIRT_PPI when PPI 15 is available and supplies the matching virtual event, counter, IRQ, and KVM PTP handling. In 6.12.y the DT parser records PPI 15, but no path selects it, so this DTS backport is inert and cannot provide its stated VHE timer behavior. d87773de9efe is a broader generic arm64 VHE timer-policy change, not a small Tegra-only data prerequisite, pulling that feature stack into 6.12.y solely for this DTS change does not look suitable for stable. I don't think it is a functional regression that could be caused by this, so we probbaly need not do anything but maybe authors of this patch could confirm. thanks, Harshit > interrupt-parent = <&gic>; > always-on;