linux-kernel - [PATCH v5 03/10] arm64/hyperv: Add some missing functions to arm64

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Message-Id: <1740611284-27506-4-git-send-email-nunodasneves@linux.microsoft.com>
Date: Wed, 26 Feb 2025 15:07:57 -0800
From: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
To: linux-hyperv@...r.kernel.org,
	x86@...nel.org,
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Subject: [PATCH v5 03/10] arm64/hyperv: Add some missing functions to arm64

These non-nested msr and fast hypercall functions are present in x86,
but they must be available in both architetures for the root partition
driver code.

Signed-off-by: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
---
 arch/arm64/hyperv/hv_core.c       | 17 +++++++++++++++++
 arch/arm64/include/asm/mshyperv.h | 12 ++++++++++++
 include/asm-generic/mshyperv.h    |  2 ++
 3 files changed, 31 insertions(+)

diff --git a/arch/arm64/hyperv/hv_core.c b/arch/arm64/hyperv/hv_core.c
index 69004f619c57..e33a9e3c366a 100644
--- a/arch/arm64/hyperv/hv_core.c
+++ b/arch/arm64/hyperv/hv_core.c
@@ -53,6 +53,23 @@ u64 hv_do_fast_hypercall8(u16 code, u64 input)
 }
 EXPORT_SYMBOL_GPL(hv_do_fast_hypercall8);
 
+/*
+ * hv_do_fast_hypercall16 -- Invoke the specified hypercall
+ * with arguments in registers instead of physical memory.
+ * Avoids the overhead of virt_to_phys for simple hypercalls.
+ */
+u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
+{
+	struct arm_smccc_res	res;
+	u64			control;
+
+	control = (u64)code | HV_HYPERCALL_FAST_BIT;
+
+	arm_smccc_1_1_hvc(HV_FUNC_ID, control, input1, input2, &res);
+	return res.a0;
+}
+EXPORT_SYMBOL_GPL(hv_do_fast_hypercall16);
+
 /*
  * Set a single VP register to a 64-bit value.
  */
diff --git a/arch/arm64/include/asm/mshyperv.h b/arch/arm64/include/asm/mshyperv.h
index 2e2f83bafcfb..2a900ba00622 100644
--- a/arch/arm64/include/asm/mshyperv.h
+++ b/arch/arm64/include/asm/mshyperv.h
@@ -40,6 +40,18 @@ static inline u64 hv_get_msr(unsigned int reg)
 	return hv_get_vpreg(reg);
 }
 
+/*
+ * Nested is not supported on arm64
+ */
+static inline void hv_set_non_nested_msr(unsigned int reg, u64 value)
+{
+	hv_set_msr(reg, value);
+}
+static inline u64 hv_get_non_nested_msr(unsigned int reg)
+{
+	return hv_get_msr(reg);
+}
+
 /* SMCCC hypercall parameters */
 #define HV_SMCCC_FUNC_NUMBER	1
 #define HV_FUNC_ID	ARM_SMCCC_CALL_VAL(			\
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index c020d5d0ec2a..258034dfd829 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -72,6 +72,8 @@ extern void * __percpu *hyperv_pcpu_output_arg;
 
 extern u64 hv_do_hypercall(u64 control, void *inputaddr, void *outputaddr);
 extern u64 hv_do_fast_hypercall8(u16 control, u64 input8);
+extern u64 hv_do_fast_hypercall16(u16 control, u64 input1, u64 input2);
+
 bool hv_isolation_type_snp(void);
 bool hv_isolation_type_tdx(void);
 
-- 
2.34.1