Rainj me/rust server refactor2 (#35239)

.github/workflows/_pr-test-check-changes.yml

@@ -25,6 +25,8 @@ on:
         value: ${{ jobs.run.outputs.jit_kernel }}
       multimodal_gen:
         value: ${{ jobs.run.outputs.multimodal_gen }}
+      rust_workspace:
+        value: ${{ jobs.run.outputs.rust_workspace }}
       partitions:
         value: ${{ jobs.run.outputs.partitions }}
       partition_model_sha:
@@ -45,6 +47,7 @@ jobs:
       sgl_kernel: ${{ steps.filter.outputs.sgl_kernel }}
       jit_kernel: ${{ steps.filter.outputs.jit_kernel || steps.run-mode.outputs.run_all_tests }}
       multimodal_gen: ${{ steps.filter.outputs.multimodal_gen || steps.run-mode.outputs.run_all_tests }}
+      rust_workspace: ${{ steps.filter.outputs.rust_workspace || steps.run-mode.outputs.run_all_tests }}
       partitions: ${{ steps.partitions.outputs.partitions }}
       partition_model_sha: ${{ steps.partition-model-sha.outputs.sha }}
       runs_on_map: ${{ steps.runner-map.outputs.runs_on_map }}
@@ -89,6 +92,8 @@ jobs:
               - "scripts/ci/cuda/*"
               - "scripts/ci/utils/*"
               - "test/**/!(*.md)"
+              - "rust/**"
+              - "proto/sglang/runtime/v1/sglang.proto"
             multimodal_gen:
               - ".github/workflows/pr-test.yml"
               - ".github/workflows/pr-test-multimodal-gen.yml"
@@ -113,6 +118,13 @@ jobs:
               # Intentionally excludes ".github/workflows/pr-test-sgl-kernel.yml" —
               # see API-side detector below for rationale.
               - "python/sglang/kernels/aot/**/!(*.md|THIRDPARTYNOTICES.txt|LICENSE)"
+            rust_workspace:
+              # Gates the cargo test in test/registered/rust/; exported to the
+              # CPU stage as its negation, SGLANG_SKIP_RUST_TESTS.
+              - "rust/**"
+              - "proto/sglang/runtime/v1/sglang.proto"
+              - "test/registered/rust/**"
+              - ".github/workflows/_pr-test-*.yml"
 
       - name: Determine full-parallel mode
         id: parallel-mode
@@ -223,6 +235,7 @@ jobs:
             echo "| sgl_kernel        | ${{ steps.filter.outputs.sgl_kernel }} |"
             echo "| jit_kernel        | ${{ steps.filter.outputs.jit_kernel || steps.run-mode.outputs.run_all_tests }} |"
             echo "| multimodal_gen    | ${{ steps.filter.outputs.multimodal_gen || steps.run-mode.outputs.run_all_tests }} |"
+            echo "| rust_workspace    | ${{ steps.filter.outputs.rust_workspace || steps.run-mode.outputs.run_all_tests }} |"
             echo "| b200_runner       | ${{ steps.set-runner.outputs.b200_runner }} |"
             echo "| enable_retry      | ${{ steps.set-retry.outputs.enable_retry }} |"
             echo "| continue_on_error | ${{ steps.set-continue-on-error.outputs.continue_on_error }} |"