[PATCH v5 03/10] arm64/hyperv: Add some missing functions to arm64
From: Nuno Das Neves <hidden>
Date: 2025-02-26 23:08:59
Also in:
linux-acpi, linux-arch, linux-hyperv, lkml
Subsystem:
arm64 port (aarch64 architecture), generic include/asm header files, hyper-v/azure core and drivers, the rest · Maintainers:
Catalin Marinas, Will Deacon, Arnd Bergmann, "K. Y. Srinivasan", Haiyang Zhang, Wei Liu, Dexuan Cui, Long Li, Linus Torvalds
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 <redacted> --- 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);
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2.34.1