arm64: Use EL2 virtual timer when running VHE
| From: | Marc Zyngier <maz-AT-kernel.org> | |
| To: | linux-arm-kernel-AT-lists.infradead.org, linux-acpi-AT-vger.kernel.org, linux-kernel-AT-vger.kernel.org, devicetree-AT-vger.kernel.org | |
| Subject: | [PATCH v3 00/17] arm64: Use EL2 virtual timer when running VHE | |
| Date: | Sat, 23 May 2026 15:02:25 +0100 | |
| Message-ID: | <20260523140242.586031-1-maz@kernel.org> | |
| Cc: | Lorenzo Pieralisi <lpieralisi-AT-kernel.org>, Hanjun Guo <guohanjun-AT-huawei.com>, Sudeep Holla <sudeep.holla-AT-kernel.org>, Catalin Marinas <catalin.marinas-AT-arm.com>, Will Deacon <will-AT-kernel.org>, "Rafael J. Wysocki" <rafael-AT-kernel.org>, Mark Rutland <mark.rutland-AT-arm.com>, Daniel Lezcano <daniel.lezcano-AT-kernel.org>, Thomas Gleixner <tglx-AT-kernel.org>, Rob Herring <robh-AT-kernel.org>, Krzysztof Kozlowski <krzk+dt-AT-kernel.org>, Conor Dooley <conor+dt-AT-kernel.org>, Chen-Yu Tsai <wens-AT-kernel.org>, Jernej Skrabec <jernej.skrabec-AT-gmail.com>, Samuel Holland <samuel-AT-sholland.org>, Neil Armstrong <neil.armstrong-AT-linaro.org>, Kevin Hilman <khilman-AT-baylibre.com>, Jerome Brunet <jbrunet-AT-baylibre.com>, Martin Blumenstingl <martin.blumenstingl-AT-googlemail.com>, Ge Gordon <gordon.ge-AT-bst.ai>, BST Linux Kernel Upstream Group <bst-upstream-AT-bstai.top>, Jesper Nilsson <jesper.nilsson-AT-axis.com>, Lars Persson <lars.persson-AT-axis.com>, Alim Akhtar <alim.akhtar-AT-samsung.com>, Ivaylo Ivanov <ivo.ivanov.ivanov1-AT-gmail.com>, Frank Li <Frank.Li-AT-nxp.com>, Sascha Hauer <s.hauer-AT-pengutronix.de>, Pengutronix Kernel Team <kernel-AT-pengutronix.de>, Fabio Estevam <festevam-AT-gmail.com>, Dinh Nguyen <dinguyen-AT-kernel.org>, Matthias Brugger <matthias.bgg-AT-gmail.com>, AngeloGioacchino Del Regno <angelogioacchino.delregno-AT-collabora.com>, Thierry Reding <thierry.reding-AT-kernel.org>, Jonathan Hunter <jonathanh-AT-nvidia.com>, Bjorn Andersson <andersson-AT-kernel.org>, Konrad Dybcio <konradybcio-AT-kernel.org>, Andreas Färber <afaerber-AT-suse.de>, Yu-Chun Lin [林祐君] <eleanor.lin-AT-realtek.com>, Heiko Stuebner <heiko-AT-sntech.de>, Shawn Lin <shawn.lin-AT-rock-chips.com>, Orson Zhai <orsonzhai-AT-gmail.com>, Baolin Wang <baolin.wang-AT-linux.alibaba.com>, Michal Simek <michal.simek-AT-amd.com> | |
| Archive-link: | Article |
This is the third version of the series initially posted at [1],
which
- updates the ACPI GTDT parsing to deal the v3 layout and the EL2
virtual timer,
- moves the architected timer driver to use it when running VHE,
- fixes a number of DTs to reflect the reality of the HW.
This results in significant performance uplift in deeper nested virt
scenarios, at no overhead to the host.
Patches based on -rc3, tested on Amlogic SM1, QC X1E, Ampere Altra,
and Apple M2, as well as KVM NV guests.
* From v2 [2]:
- Add more consistency checks to the GTDT parsing
- Match the virtual counter when using the KVM PTP backend
- Drop a number of changes to Qualcomm DTs, being only tangentially
related and that will be posted separately
- Fix the Realtek Kent platform, which had the GICv3 maintenance
interrupt advertised as the EL2 virtual timer
- Collected TBs and RBs, with thanks
* From v1 [2]:
- Now also using the EL2 virtual counter, which further improve
things when running at a deeper nesting level
- Updated consistency checks for the platform timers when finding a
GTDTv3
- Collected ABs and RBs, with thanks
[1] https://lore.kernel.org/r/20260507125544.2903406-1-maz@ke...
[2] https://lore.kernel.org/r/20260514150945.3917510-1-maz@ke...
Marc Zyngier (17):
ACPI: GTDT: Account for GTDTv3 size when walking the platform timer
descriptors
ACPI: GTDT: Parse information related to the EL2 virtual timer
clocksource/drivers/arm_arch_timer: Default to EL2 virtual timer when
running VHE
dt-bindings: timer: arm,arch_timer: Fix requirements for interrupt
description
arm64: dts: allwinner: Add EL2 virtual timer interrupt
arm64: dts: amlogic: Add EL2 virtual timer interrupt
arm64: dts: bst: Add EL2 virtual timer interrupt
arm64: dts: exynos: Add EL2 virtual timer interrupt
arm64: dts: freescale: Add EL2 virtual timer interrupt
arm64: dts: intel: Add EL2 virtual timer interrupt
arm64: dts: mediatek: Add EL2 virtual timer interrupt
arm64: dts: nvidia: Add EL2 virtual timer interrupt
arm64: dts: qcom: Add EL2 virtual timer interrupt
arm64: dts: realtek: Add EL2 virtual timer interrupt
arm64: dts: rockchip: Add EL2 virtual timer interrupt
arm64: dts: sprd: Add EL2 virtual timer interrupt
arm64: dts: xilinx: Add EL2 virtual timer interrupt
.../bindings/timer/arm,arch_timer.yaml | 21 +++----
.../arm64/boot/dts/allwinner/sun55i-a523.dtsi | 3 +-
.../boot/dts/amlogic/amlogic-a4-common.dtsi | 8 ---
arch/arm64/boot/dts/amlogic/amlogic-a4.dtsi | 8 +++
arch/arm64/boot/dts/amlogic/amlogic-a5.dtsi | 9 +++
arch/arm64/boot/dts/amlogic/amlogic-s6.dtsi | 3 +-
arch/arm64/boot/dts/amlogic/amlogic-s7.dtsi | 3 +-
arch/arm64/boot/dts/amlogic/amlogic-s7d.dtsi | 3 +-
.../boot/dts/amlogic/meson-g12-common.dtsi | 13 -----
arch/arm64/boot/dts/amlogic/meson-g12.dtsi | 9 +++
arch/arm64/boot/dts/amlogic/meson-sm1.dtsi | 10 ++++
arch/arm64/boot/dts/bst/bstc1200.dtsi | 3 +-
arch/arm64/boot/dts/exynos/axis/artpec9.dtsi | 3 +-
arch/arm64/boot/dts/exynos/exynos2200.dtsi | 3 +-
arch/arm64/boot/dts/exynos/exynos990.dtsi | 3 +-
arch/arm64/boot/dts/exynos/exynosautov9.dtsi | 3 +-
arch/arm64/boot/dts/exynos/google/gs101.dtsi | 3 +-
.../boot/dts/freescale/imx91_93_common.dtsi | 3 +-
arch/arm64/boot/dts/freescale/imx94.dtsi | 3 +-
arch/arm64/boot/dts/freescale/imx95.dtsi | 3 +-
arch/arm64/boot/dts/freescale/imx952.dtsi | 3 +-
arch/arm64/boot/dts/freescale/s32n79.dtsi | 3 +-
.../arm64/boot/dts/intel/socfpga_agilex5.dtsi | 3 +-
arch/arm64/boot/dts/mediatek/mt6779.dtsi | 3 +-
arch/arm64/boot/dts/mediatek/mt8186.dtsi | 3 +-
arch/arm64/boot/dts/mediatek/mt8188.dtsi | 3 +-
arch/arm64/boot/dts/mediatek/mt8192.dtsi | 3 +-
arch/arm64/boot/dts/mediatek/mt8195.dtsi | 3 +-
arch/arm64/boot/dts/nvidia/tegra194.dtsi | 2 +
arch/arm64/boot/dts/nvidia/tegra234.dtsi | 3 +-
arch/arm64/boot/dts/qcom/eliza.dtsi | 3 +-
arch/arm64/boot/dts/qcom/hamoa.dtsi | 3 +-
arch/arm64/boot/dts/qcom/kaanapali.dtsi | 3 +-
arch/arm64/boot/dts/qcom/kodiak.dtsi | 3 +-
arch/arm64/boot/dts/qcom/lemans.dtsi | 3 +-
arch/arm64/boot/dts/qcom/monaco.dtsi | 3 +-
arch/arm64/boot/dts/qcom/sar2130p.dtsi | 3 +-
arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 3 +-
arch/arm64/boot/dts/qcom/sm4450.dtsi | 3 +-
arch/arm64/boot/dts/qcom/sm8250.dtsi | 3 +-
arch/arm64/boot/dts/qcom/sm8350.dtsi | 3 +-
arch/arm64/boot/dts/qcom/sm8450.dtsi | 3 +-
arch/arm64/boot/dts/qcom/sm8550.dtsi | 3 +-
arch/arm64/boot/dts/qcom/sm8650.dtsi | 3 +-
arch/arm64/boot/dts/qcom/sm8750.dtsi | 3 +-
arch/arm64/boot/dts/realtek/kent.dtsi | 2 +-
arch/arm64/boot/dts/realtek/rtd16xx.dtsi | 3 +-
arch/arm64/boot/dts/rockchip/rk356x-base.dtsi | 3 +-
arch/arm64/boot/dts/sprd/sc9863a.dtsi | 3 +-
arch/arm64/boot/dts/sprd/ums512.dtsi | 3 +-
arch/arm64/boot/dts/sprd/ums9620.dtsi | 3 +-
arch/arm64/boot/dts/xilinx/versal-net.dtsi | 3 +-
drivers/acpi/arm64/gtdt.c | 42 +++++++++++++-
drivers/clocksource/arm_arch_timer.c | 55 +++++++++++--------
54 files changed, 206 insertions(+), 102 deletions(-)
--
2.47.3