From: Usama Arif <usama.arif@bytedance.com>
To: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org,
linux-doc@vger.kernel.org,
virtualization@lists.linux-foundation.org, linux@armlinux.org.uk,
yezengruan@huawei.com, catalin.marinas@arm.com, will@kernel.org,
maz@kernel.org, steven.price@arm.com, mark.rutland@arm.com
Cc: fam.zheng@bytedance.com, liangma@liangbit.com,
punit.agrawal@bytedance.com,
Usama Arif <usama.arif@bytedance.com>
Subject: [RFC 2/6] KVM: arm64: Add SMCCC paravirtualised lock calls
Date: Wed, 2 Nov 2022 16:13:36 +0000 [thread overview]
Message-ID: <20221102161340.2982090-3-usama.arif@bytedance.com> (raw)
In-Reply-To: <20221102161340.2982090-1-usama.arif@bytedance.com>
Add two new SMCCC compatible hypercalls for PV lock features:
PV_LOCK_FEATURES: 0xC6000020
PV_LOCK_PREEMPTED: 0xC6000021
Also add the header file which defines the ABI for the paravirtualized
lock features we're about to add.
Signed-off-by: Zengruan Ye <yezengruan@huawei.com>
Signed-off-by: Usama Arif <usama.arif@bytedance.com>
---
arch/arm64/include/asm/pvlock-abi.h | 17 +++++++++++++++++
include/linux/arm-smccc.h | 13 +++++++++++++
2 files changed, 30 insertions(+)
create mode 100644 arch/arm64/include/asm/pvlock-abi.h
diff --git a/arch/arm64/include/asm/pvlock-abi.h b/arch/arm64/include/asm/pvlock-abi.h
new file mode 100644
index 000000000000..3f4574071679
--- /dev/null
+++ b/arch/arm64/include/asm/pvlock-abi.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright(c) 2019 Huawei Technologies Co., Ltd
+ * Author: Zengruan Ye <yezengruan@huawei.com>
+ * Usama Arif <usama.arif@bytedance.com>
+ */
+
+#ifndef __ASM_PVLOCK_ABI_H
+#define __ASM_PVLOCK_ABI_H
+
+struct pvlock_vcpu_state {
+ __le64 preempted;
+ /* Structure must be 64 byte aligned, pad to that size */
+ u8 padding[56];
+} __packed;
+
+#endif
diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
index 220c8c60e021..6360333e0f64 100644
--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h
@@ -151,6 +151,19 @@
ARM_SMCCC_OWNER_STANDARD_HYP, \
0x21)
+/* Paravirtualised lock calls */
+#define ARM_SMCCC_HV_PV_LOCK_FEATURES \
+ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
+ ARM_SMCCC_SMC_64, \
+ ARM_SMCCC_OWNER_VENDOR_HYP, \
+ 0x20)
+
+#define ARM_SMCCC_HV_PV_LOCK_PREEMPTED \
+ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
+ ARM_SMCCC_SMC_64, \
+ ARM_SMCCC_OWNER_VENDOR_HYP, \
+ 0x21)
+
/* TRNG entropy source calls (defined by ARM DEN0098) */
#define ARM_SMCCC_TRNG_VERSION \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
--
2.25.1
next prev parent reply other threads:[~2022-11-02 16:21 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-02 16:13 [RFC 0/6] KVM: arm64: implement vcpu_is_preempted check Usama Arif
2022-11-02 16:13 ` [RFC 1/6] KVM: arm64: Document PV-lock interface Usama Arif
2022-11-03 3:50 ` Bagas Sanjaya
2022-11-03 13:15 ` [External] " Usama Arif
2022-11-03 13:56 ` Bagas Sanjaya
2022-11-02 16:13 ` Usama Arif [this message]
2022-11-02 16:13 ` [RFC 3/6] KVM: arm64: Support pvlock preempted via shared structure Usama Arif
2022-11-02 16:13 ` [RFC 4/6] KVM: arm64: Provide VCPU attributes for PV lock Usama Arif
2022-11-02 16:13 ` [RFC 5/6] KVM: arm64: Support the VCPU preemption check Usama Arif
2022-11-03 13:25 ` Steven Price
2022-11-04 6:24 ` [External] " Usama Arif
2022-11-02 16:13 ` [RFC 6/6] KVM: selftests: add tests for PV time specific hypercalls Usama Arif
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