diff mbox series

[v3,2/6] KVM: arm64: Add SMCCC paravirtualised lock calls

Message ID 20230117102930.1053337-3-usama.arif@bytedance.com (mailing list archive)
State New, archived
Headers show
Series KVM: arm64: implement vcpu_is_preempted check | expand

Commit Message

Usama Arif Jan. 17, 2023, 10:29 a.m. UTC 
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 <yezengruan@huawei.com>
Signed-off-by: Usama Arif <usama.arif@bytedance.com>
---
 arch/arm64/include/asm/pvlock-abi.h | 15 +++++++++++++++
 include/linux/arm-smccc.h           |  8 ++++++++
 tools/include/linux/arm-smccc.h     |  8 ++++++++
 3 files changed, 31 insertions(+)
 create mode 100644 arch/arm64/include/asm/pvlock-abi.h
diff mbox series

Patch

diff --git a/arch/arm64/include/asm/pvlock-abi.h b/arch/arm64/include/asm/pvlock-abi.h
new file mode 100644
index 000000000000..e12c8ec05178
--- /dev/null
+++ b/arch/arm64/include/asm/pvlock-abi.h
@@ -0,0 +1,15 @@ 
+/* 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;
+} __aligned(64);
+
+#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,			\