[PATCH v3 4/8] KVM: arm64: Add SMCCC paravirtualised lock calls
From: Zengruan Ye <hidden>
Date: 2020-01-16 12:46:58
Also in:
kvm, kvmarm, linux-doc, lkml, virtualization
Subsystem:
arm64 port (aarch64 architecture), secure monitor call(smc) calling convention (smccc), the rest · Maintainers:
Catalin Marinas, Will Deacon, Mark Rutland, Lorenzo Pieralisi, Sudeep Holla, Linus Torvalds
Add two new SMCCC compatible hypercalls for PV lock features: * ARM_SMCCC_VENDOR_HYP_KVM_PV_LOCK_FUNC_ID: 0x86000001 - KVM_PV_LOCK_FEATURES: 0 - KVM_PV_LOCK_PREEMPTED: 1 Also add the header file which defines the ABI for the paravirtualized lock features we're about to add. Signed-off-by: Zengruan Ye <redacted> --- arch/arm64/include/asm/pvlock-abi.h | 16 ++++++++++++++++ include/linux/arm-smccc.h | 10 ++++++++++ 2 files changed, 26 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 2b2c295c9109..081be5f6a6be 100644
--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h@@ -394,14 +394,24 @@ asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1, /* KVM "vendor specific" services */ #define ARM_SMCCC_KVM_FUNC_FEATURES 0 +#define ARM_SMCCC_KVM_FUNC_PV_LOCK 1 #define ARM_SMCCC_KVM_FUNC_FEATURES_2 127 #define ARM_SMCCC_KVM_NUM_FUNCS 128 +#define KVM_PV_LOCK_FEATURES 0 +#define KVM_PV_LOCK_PREEMPTED 1 + #define ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ ARM_SMCCC_SMC_32, \ ARM_SMCCC_OWNER_VENDOR_HYP, \ ARM_SMCCC_KVM_FUNC_FEATURES) +#define ARM_SMCCC_VENDOR_HYP_KVM_PV_LOCK_FUNC_ID \ + ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ + ARM_SMCCC_SMC_32, \ + ARM_SMCCC_OWNER_VENDOR_HYP, \ + ARM_SMCCC_KVM_FUNC_PV_LOCK) + #endif /*__ASSEMBLY__*/ #endif /*__LINUX_ARM_SMCCC_H*/
--
2.19.1
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