From 93de2a6a4b91b72607136dd656edf03fb399d27f Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Wed, 23 Sep 2026 09:37:21 -0700 Subject: KVM: SEV: Do cache maintenance on the source VM during intra-host migration Manually perform cache maintenance on the source VM during intra-host migration to ensure no stale data is left in CPU caches after the VM is destroyed. Because the source VM is "converted" to a non-SEV VM, KVM's memory reclaim flows won't trigger cache maintenance, e.g. when all guest memory is reclaimed in response to detaching from the mmu_notifier. Note, relying on the destination VM to do cache maintenance isn't an option as KVM doesn't require identical guest memory configurations, i.e. the source VM may have access to memory that the destination VM does not. Enforcing equivalent memory configurations is infeasible, as it would require a *deep* comparison of memslots, e.g. to verify that not only are the memslot identical, but what the memslots point at is also identical. Fixes: b56639318bb2 ("KVM: SEV: Add support for SEV intra host migration") Cc: stable@vger.kernel.org Reported-by: Stefan Teodorescu Signed-off-by: Sean Christopherson Message-ID: <20260923163721.1584779-3-seanjc@google.com> Signed-off-by: Paolo Bonzini --- .../trigger-source/adi,util-sigma-delta-spi.yaml | 49 ++++++++++++++++++++++ .../bindings/trigger-source/gpio-trigger.yaml | 40 ++++++++++++++++++ .../bindings/trigger-source/pwm-trigger.yaml | 37 ++++++++++++++++ 3 files changed, 126 insertions(+) create mode 100644 Documentation/devicetree/bindings/trigger-source/adi,util-sigma-delta-spi.yaml create mode 100644 Documentation/devicetree/bindings/trigger-source/gpio-trigger.yaml create mode 100644 Documentation/devicetree/bindings/trigger-source/pwm-trigger.yaml (limited to 'Documentation/devicetree/bindings/trigger-source') diff --git a/Documentation/devicetree/bindings/trigger-source/adi,util-sigma-delta-spi.yaml b/Documentation/devicetree/bindings/trigger-source/adi,util-sigma-delta-spi.yaml new file mode 100644 index 000000000..ea4661795 --- /dev/null +++ b/Documentation/devicetree/bindings/trigger-source/adi,util-sigma-delta-spi.yaml @@ -0,0 +1,49 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +# Copyright (c) 2025 Analog Devices, Inc. +# Copyright (c) 2025 BayLibre, SAS + +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/trigger-source/adi,util-sigma-delta-spi.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Analog Devices Util Sigma-Delta SPI IP Core + +maintainers: + - David Lechner + +description: + The Util Sigma-Delta SPI is an FPGA IP core from Analog Devices that provides + a SPI offload trigger from the RDY signal of the combined DOUT/RDY pin of + the sigma-delta family of ADCs. + https://analogdevicesinc.github.io/hdl/library/util_sigma_delta_spi/index.html + +properties: + compatible: + const: adi,util-sigma-delta-spi + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + + '#trigger-source-cells': + const: 0 + +required: + - compatible + - reg + - clocks + - '#trigger-source-cells' + +additionalProperties: false + +examples: + - | + trigger@40000 { + reg = <0x40000 0x1000>; + compatible = "adi,util-sigma-delta-spi"; + clocks = <&clk 0>; + #trigger-source-cells = <0>; + }; diff --git a/Documentation/devicetree/bindings/trigger-source/gpio-trigger.yaml b/Documentation/devicetree/bindings/trigger-source/gpio-trigger.yaml new file mode 100644 index 000000000..1331d153e --- /dev/null +++ b/Documentation/devicetree/bindings/trigger-source/gpio-trigger.yaml @@ -0,0 +1,40 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/trigger-source/gpio-trigger.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Generic trigger source using GPIO + +description: A GPIO used as a trigger source. + +maintainers: + - Jonathan Santos + +properties: + compatible: + const: gpio-trigger + + '#trigger-source-cells': + const: 0 + + gpios: + maxItems: 1 + description: GPIO to be used as a trigger source. + +required: + - compatible + - '#trigger-source-cells' + - gpios + +additionalProperties: false + +examples: + - | + #include + + trigger { + compatible = "gpio-trigger"; + #trigger-source-cells = <0>; + gpios = <&gpio1 15 GPIO_ACTIVE_HIGH>; + }; diff --git a/Documentation/devicetree/bindings/trigger-source/pwm-trigger.yaml b/Documentation/devicetree/bindings/trigger-source/pwm-trigger.yaml new file mode 100644 index 000000000..1eac20031 --- /dev/null +++ b/Documentation/devicetree/bindings/trigger-source/pwm-trigger.yaml @@ -0,0 +1,37 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/trigger-source/pwm-trigger.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Generic trigger source using PWM + +description: Remaps a PWM channel as a trigger source. + +maintainers: + - David Lechner + +properties: + compatible: + const: pwm-trigger + + '#trigger-source-cells': + const: 0 + + pwms: + maxItems: 1 + +required: + - compatible + - '#trigger-source-cells' + - pwms + +additionalProperties: false + +examples: + - | + trigger { + compatible = "pwm-trigger"; + #trigger-source-cells = <0>; + pwms = <&pwm 0 1000000 0>; + }; -- cgit v1.3.1