linux-kernel - [PATCH 1/2] dt-bindings: vcpu_stall_detector: Add a PPI interrupt to the virtual device

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Message-ID: <20240523160413.868830-2-sebastianene@google.com>
Date: Thu, 23 May 2024 16:04:12 +0000
From: Sebastian Ene <sebastianene@...gle.com>
To: arnd@...db.de, gregkh@...uxfoundation.org, will@...nel.org, maz@...nel.org, 
	Rob Herring <robh+dt@...nel.org>, Dragan Cvetic <dragan.cvetic@...inx.com>, 
	Guenter Roeck <linux@...ck-us.net>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
	kernel-team@...roid.com, Sebastian Ene <sebastianene@...gle.com>
Subject: [PATCH 1/2] dt-bindings: vcpu_stall_detector: Add a PPI interrupt to
 the virtual device

The vcpu stall detector allows the host to monitor the availability of a
guest VM. Introduce a PPI interrupt which can be injected from the host
into the virtual gic to let the guest reboot itself.

Signed-off-by: Sebastian Ene <sebastianene@...gle.com>
---
 .../devicetree/bindings/misc/qemu,vcpu-stall-detector.yaml  | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/misc/qemu,vcpu-stall-detector.yaml b/Documentation/devicetree/bindings/misc/qemu,vcpu-stall-detector.yaml
index 1aebeb696ee0..e12d80be00cd 100644
--- a/Documentation/devicetree/bindings/misc/qemu,vcpu-stall-detector.yaml
+++ b/Documentation/devicetree/bindings/misc/qemu,vcpu-stall-detector.yaml
@@ -29,6 +29,9 @@ properties:
       Defaults to 10 if unset.
     default: 10
 
+  interrupts:
+    maxItems: 1
+
   timeout-sec:
     description: |
       The stall detector expiration timeout measured in seconds.
@@ -43,9 +46,12 @@ additionalProperties: false
 
 examples:
   - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
     vmwdt@...0000 {
       compatible = "qemu,vcpu-stall-detector";
       reg = <0x9030000 0x10000>;
       clock-frequency = <10>;
       timeout-sec = <8>;
+      interrupts = <GIC_PPI 15 IRQ_TYPE_EDGE_RISING>;
     };
-- 
2.45.1.288.g0e0cd299f1-goog