diff options
author | Paolo Bonzini <pbonzini@redhat.com> | 2024-11-27 12:00:28 -0500 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2024-11-27 12:00:28 -0500 |
commit | 4d911c7abee56771b0219a9fbf0120d06bdc9c14 (patch) | |
tree | 963841f48abe702c2bc808b4567ab7949b1c631d /Documentation | |
parent | c1668520c9aa4019738f27097b187a5460646cbc (diff) | |
parent | c74bfe4ffe8c1ca94e3d60ec7af06cf679e23583 (diff) |
Merge tag 'kvm-riscv-6.13-2' of https://github.com/kvm-riscv/linux into HEAD
KVM/riscv changes for 6.13 part #2
- Svade and Svadu extension support for Host and Guest/VM
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/devicetree/bindings/riscv/extensions.yaml | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml index af7e5237b2c0..9c7dd7e75e0c 100644 --- a/Documentation/devicetree/bindings/riscv/extensions.yaml +++ b/Documentation/devicetree/bindings/riscv/extensions.yaml @@ -171,6 +171,34 @@ properties: ratified at commit 3f9ed34 ("Add ability to manually trigger workflow. (#2)") of riscv-time-compare. + - const: svade + description: | + The standard Svade supervisor-level extension for SW-managed PTE A/D + bit updates as ratified in the 20240213 version of the privileged + ISA specification. + + Both Svade and Svadu extensions control the hardware behavior when + the PTE A/D bits need to be set. The default behavior for the four + possible combinations of these extensions in the device tree are: + 1) Neither Svade nor Svadu present in DT => It is technically + unknown whether the platform uses Svade or Svadu. Supervisor + software should be prepared to handle either hardware updating + of the PTE A/D bits or page faults when they need updated. + 2) Only Svade present in DT => Supervisor must assume Svade to be + always enabled. + 3) Only Svadu present in DT => Supervisor must assume Svadu to be + always enabled. + 4) Both Svade and Svadu present in DT => Supervisor must assume + Svadu turned-off at boot time. To use Svadu, supervisor must + explicitly enable it using the SBI FWFT extension. + + - const: svadu + description: | + The standard Svadu supervisor-level extension for hardware updating + of PTE A/D bits as ratified in the 20240528 version of the + privileged ISA specification. Please refer to Svade dt-binding + description for more details. + - const: svinval description: The standard Svinval supervisor-level extension for fine-grained |