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Subject[PATCH v2 2/6] KVM: arm64: Add SMCCC paravirtualised lock calls
Date
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>
---
arch/arm64/include/asm/pvlock-abi.h | 16 ++++++++++++++++
include/linux/arm-smccc.h | 14 ++++++++++++++
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..06e0c3d7710a
--- /dev/null
+++ b/arch/arm64/include/asm/pvlock-abi.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright(c) 2019 Huawei Technologies Co., Ltd
+ * Author: Zengruan Ye <yezengruan@huawei.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 59494df0f55b..3a5c6b35492f 100644
--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h
@@ -46,6 +46,7 @@
#define ARM_SMCCC_OWNER_OEM 3
#define ARM_SMCCC_OWNER_STANDARD 4
#define ARM_SMCCC_OWNER_STANDARD_HYP 5
+#define ARM_SMCCC_OWNER_VENDOR_HYP 6
#define ARM_SMCCC_OWNER_TRUSTED_APP 48
#define ARM_SMCCC_OWNER_TRUSTED_APP_END 49
#define ARM_SMCCC_OWNER_TRUSTED_OS 50
@@ -377,5 +378,18 @@ asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
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)
+
#endif /*__ASSEMBLY__*/
#endif /*__LINUX_ARM_SMCCC_H*/
--
2.19.1

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