[v2 2/6] KVM: arm64: Add SMCCC paravirtualised lock calls
From: Usama Arif <hidden>
Date: 2022-11-04 06:21:33
Also in:
kvm, kvmarm, linux-doc, lkml
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 a new SMCCC compatible hypercalls for PV lock features: ARM_SMCCC_KVM_FUNC_PV_LOCK: 0xC6000002 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> Signed-off-by: Usama Arif <redacted> --- arch/arm64/include/asm/pvlock-abi.h | 17 +++++++++++++++++ include/linux/arm-smccc.h | 8 ++++++++ tools/include/linux/arm-smccc.h | 8 ++++++++ 3 files changed, 33 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..104c10035b10 100644
--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h@@ -112,6 +112,7 @@ /* KVM "vendor specific" services */ #define ARM_SMCCC_KVM_FUNC_FEATURES 0 #define ARM_SMCCC_KVM_FUNC_PTP 1 +#define ARM_SMCCC_KVM_FUNC_PV_LOCK 2 #define ARM_SMCCC_KVM_FUNC_FEATURES_2 127 #define ARM_SMCCC_KVM_NUM_FUNCS 128
@@ -151,6 +152,13 @@ ARM_SMCCC_OWNER_STANDARD_HYP, \ 0x21) +/* Paravirtualised lock calls */ +#define ARM_SMCCC_VENDOR_HYP_KVM_PV_LOCK_FUNC_ID \ + ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ + ARM_SMCCC_SMC_64, \ + ARM_SMCCC_OWNER_VENDOR_HYP, \ + ARM_SMCCC_KVM_FUNC_PV_LOCK) + /* TRNG entropy source calls (defined by ARM DEN0098) */ #define ARM_SMCCC_TRNG_VERSION \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
diff --git a/tools/include/linux/arm-smccc.h b/tools/include/linux/arm-smccc.h
index 63ce9bebccd3..c21e539c0228 100644
--- a/tools/include/linux/arm-smccc.h
+++ b/tools/include/linux/arm-smccc.h@@ -111,6 +111,7 @@ /* KVM "vendor specific" services */ #define ARM_SMCCC_KVM_FUNC_FEATURES 0 #define ARM_SMCCC_KVM_FUNC_PTP 1 +#define ARM_SMCCC_KVM_FUNC_PV_LOCK 2 #define ARM_SMCCC_KVM_FUNC_FEATURES_2 127 #define ARM_SMCCC_KVM_NUM_FUNCS 128
@@ -150,6 +151,13 @@ ARM_SMCCC_OWNER_STANDARD_HYP, \ 0x21) +/* Paravirtualised lock calls */ +#define ARM_SMCCC_VENDOR_HYP_KVM_PV_LOCK_FUNC_ID \ + ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ + ARM_SMCCC_SMC_64, \ + ARM_SMCCC_OWNER_VENDOR_HYP, \ + ARM_SMCCC_KVM_FUNC_PV_LOCK) + /* TRNG entropy source calls (defined by ARM DEN0098) */ #define ARM_SMCCC_TRNG_VERSION \ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
--
2.25.1
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