Re: [PATCH v2] Cache Coherency and ASID Requirements for OS-A platform


On Wed, 2021-06-30 at 16:19 -0700, Kumar Sankaran wrote:
Updated v2 of the cache coherency patch
Changes from v1
    Brought in all cache coherency changes after feedback
    Removed ASID requirements

diff --git a/riscv-platform-spec.adoc b/riscv-platform-spec.adoc
index 87ab7f8..3953b5e 100644
--- a/riscv-platform-spec.adoc
+++ b/riscv-platform-spec.adoc
@@ -89,8 +89,13 @@ The M platform has the following extensions:
 * ISA Profile
 ** The OS-A platform is required to comply with the RVA22 profile.
 * Cache Coherency
-* PMU
+** All harts must adhere to the RVWMO memory model.
+** All hart PMA regions for main memory must be marked as coherent.
+** Memory accesses by I/O masters can be coherent or non-coherent with
+to all hart-related caches.
+==== PMU

 ==== Debug
 The OS-A base platform requirements are -
@@ -288,10 +293,11 @@ base with the additional requirements as below.
 ==== Architecture
 The platforms which conform to server extension are required to
implement +

-- RISC-V Hypervisor-level H Instruction-Set Extensions
-- IOMMU with support for memory resident interrupt files
-- PMU
+- RV64 support
+- RISC-V H ISA extension
+- VMID support
+==== PMU

 ==== Debug
 The OS-A server platform requirements are all of the base above plus:
@@ -306,6 +312,8 @@ above.
 respect to all harts connected to the DM
   * Rationale: Debuggers must be able to view memory coherently

+==== Interrupt Controller
 ==== Boot and Runtime Requirements
 =====  Firmware
 The boot and system firmware for the RV64I server platforms required
to be

Reviewed-by: Atish Patra <atish.patra@...>


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