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List:       linux-api
Subject:    [RFC PATCH v2 11/11] selftests/rseq: Implement rseq vm_vcpu_id field support
From:       Mathieu Desnoyers <mathieu.desnoyers () efficios ! com>
Date:       2022-02-18 21:06:33
Message-ID: 20220218210633.23345-12-mathieu.desnoyers () efficios ! com
[Download RAW message or body]

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---
 tools/testing/selftests/rseq/rseq-abi.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tools/testing/selftests/rseq/rseq-abi.h b/tools/testing/selftests/rseq/rseq-abi.h
index a1faa9162d52..1ee4740ebe94 100644
--- a/tools/testing/selftests/rseq/rseq-abi.h
+++ b/tools/testing/selftests/rseq/rseq-abi.h
@@ -155,6 +155,15 @@ struct rseq_abi {
 	 */
 	__u32 node_id;
 
+	/*
+	 * Restartable sequences vm_vcpu_id field. Updated by the kernel. Read by
+	 * user-space with single-copy atomicity semantics. This field should
+	 * only be read by the thread which registered this data structure.
+	 * Aligned on 32-bit. Contains the current thread's virtual CPU ID
+	 * (allocated uniquely within a memory space).
+	 */
+	__u32 vm_vcpu_id;
+
 	/*
 	 * Flexible array member at end of structure, after last feature field.
 	 */
-- 
2.17.1

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