linux-kernel - [PATCH v4 12/25] selftests/rseq: Implement rseq vm_vcpu

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Message-Id: <20220922105941.237830-13-mathieu.desnoyers@efficios.com>
Date:   Thu, 22 Sep 2022 06:59:27 -0400
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        "H . Peter Anvin" <hpa@...or.com>, Paul Turner <pjt@...gle.com>,
        linux-api@...r.kernel.org, Christian Brauner <brauner@...nel.org>,
        Florian Weimer <fw@...eb.enyo.de>, David.Laight@...LAB.COM,
        carlos@...hat.com, Peter Oskolkov <posk@...k.io>,
        Alexander Mikhalitsyn <alexander@...alicyn.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: [PATCH v4 12/25] selftests/rseq: Implement rseq vm_vcpu_id field support

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
---
 tools/testing/selftests/rseq/rseq-abi.h |  9 +++++++++
 tools/testing/selftests/rseq/rseq.h     | 10 ++++++++++
 2 files changed, 19 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.
 	 */
diff --git a/tools/testing/selftests/rseq/rseq.h b/tools/testing/selftests/rseq/rseq.h
index fd17d0e54a1b..003e0e3750ce 100644
--- a/tools/testing/selftests/rseq/rseq.h
+++ b/tools/testing/selftests/rseq/rseq.h
@@ -191,6 +191,16 @@ static inline uint32_t rseq_current_node_id(void)
 	return RSEQ_ACCESS_ONCE(rseq_get_abi()->node_id);
 }
 
+static inline bool rseq_vm_vcpu_id_available(void)
+{
+	return (int) rseq_feature_size >= rseq_offsetofend(struct rseq_abi, vm_vcpu_id);
+}
+
+static inline uint32_t rseq_current_vm_vcpu_id(void)
+{
+	return RSEQ_ACCESS_ONCE(rseq_get_abi()->vm_vcpu_id);
+}
+
 static inline void rseq_clear_rseq_cs(void)
 {
 	RSEQ_WRITE_ONCE(rseq_get_abi()->rseq_cs.arch.ptr, 0);
-- 
2.25.1