linux-kernel - [PATCH 3/7] x86/hyperv: Use hv_hvcall_*() to set up hypercall arguments -- part 1

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Message-Id: <20250226200612.2062-4-mhklinux@outlook.com>
Date: Wed, 26 Feb 2025 12:06:08 -0800
From: mhkelley58@...il.com
To: kys@...rosoft.com,
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Cc: x86@...nel.org,
	linux-hyperv@...r.kernel.org,
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Subject: [PATCH 3/7] x86/hyperv: Use hv_hvcall_*() to set up hypercall arguments -- part 1

From: Michael Kelley <mhklinux@...look.com>

Update hypercall call sites to use the new hv_hvcall_*() functions
to set up hypercall arguments. Since these functions zero the
fixed portion of input memory, remove now redundant calls to memset()
and explicit zero'ing of input fields.

Signed-off-by: Michael Kelley <mhklinux@...look.com>
---
 arch/x86/hyperv/hv_apic.c   |  6 ++----
 arch/x86/hyperv/hv_init.c   |  5 +----
 arch/x86/hyperv/hv_vtl.c    |  8 ++------
 arch/x86/hyperv/irqdomain.c | 10 ++++------
 4 files changed, 9 insertions(+), 20 deletions(-)

diff --git a/arch/x86/hyperv/hv_apic.c b/arch/x86/hyperv/hv_apic.c
index f022d5f64fb6..c16f81dd36fc 100644
--- a/arch/x86/hyperv/hv_apic.c
+++ b/arch/x86/hyperv/hv_apic.c
@@ -115,14 +115,12 @@ static bool __send_ipi_mask_ex(const struct cpumask *mask, int vector,
 		return false;
 
 	local_irq_save(flags);
-	ipi_arg = *this_cpu_ptr(hyperv_pcpu_input_arg);
-
+	hv_hvcall_in_array(&ipi_arg, sizeof(*ipi_arg),
+				sizeof(ipi_arg->vp_set.bank_contents[0]));
 	if (unlikely(!ipi_arg))
 		goto ipi_mask_ex_done;
 
 	ipi_arg->vector = vector;
-	ipi_arg->reserved = 0;
-	ipi_arg->vp_set.valid_bank_mask = 0;
 
 	/*
 	 * Use HV_GENERIC_SET_ALL and avoid converting cpumask to VP_SET
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index ddeb40930bc8..c5c9511cb7ed 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -400,13 +400,10 @@ static u8 __init get_vtl(void)
 	u64 ret;
 
 	local_irq_save(flags);
-	input = *this_cpu_ptr(hyperv_pcpu_input_arg);
-	output = *this_cpu_ptr(hyperv_pcpu_output_arg);
 
-	memset(input, 0, struct_size(input, names, 1));
+	hv_hvcall_inout(&input, sizeof(*input), &output, sizeof(*output));
 	input->partition_id = HV_PARTITION_ID_SELF;
 	input->vp_index = HV_VP_INDEX_SELF;
-	input->input_vtl.as_uint8 = 0;
 	input->names[0] = HV_REGISTER_VSM_VP_STATUS;
 
 	ret = hv_do_hypercall(control, input, output);
diff --git a/arch/x86/hyperv/hv_vtl.c b/arch/x86/hyperv/hv_vtl.c
index 3f4e20d7b724..3dd27d548db6 100644
--- a/arch/x86/hyperv/hv_vtl.c
+++ b/arch/x86/hyperv/hv_vtl.c
@@ -94,8 +94,7 @@ static int hv_vtl_bringup_vcpu(u32 target_vp_index, int cpu, u64 eip_ignored)
 
 	local_irq_save(irq_flags);
 
-	input = *this_cpu_ptr(hyperv_pcpu_input_arg);
-	memset(input, 0, sizeof(*input));
+	hv_hvcall_in(&input, sizeof(*input));
 
 	input->partition_id = HV_PARTITION_ID_SELF;
 	input->vp_index = target_vp_index;
@@ -185,13 +184,10 @@ static int hv_vtl_apicid_to_vp_id(u32 apic_id)
 
 	local_irq_save(irq_flags);
 
-	input = *this_cpu_ptr(hyperv_pcpu_input_arg);
-	memset(input, 0, sizeof(*input));
+	hv_hvcall_inout(&input, sizeof(*input), &output, sizeof(*output));
 	input->partition_id = HV_PARTITION_ID_SELF;
 	input->apic_ids[0] = apic_id;
 
-	output = *this_cpu_ptr(hyperv_pcpu_output_arg);
-
 	control = HV_HYPERCALL_REP_COMP_1 | HVCALL_GET_VP_ID_FROM_APIC_ID;
 	status = hv_do_hypercall(control, input, output);
 	ret = output[0];
diff --git a/arch/x86/hyperv/irqdomain.c b/arch/x86/hyperv/irqdomain.c
index 64b921360b0f..803b1a945c5c 100644
--- a/arch/x86/hyperv/irqdomain.c
+++ b/arch/x86/hyperv/irqdomain.c
@@ -24,11 +24,11 @@ static int hv_map_interrupt(union hv_device_id device_id, bool level,
 
 	local_irq_save(flags);
 
-	input = *this_cpu_ptr(hyperv_pcpu_input_arg);
-	output = *this_cpu_ptr(hyperv_pcpu_output_arg);
+	hv_hvcall_inout_array(&input, sizeof(*input),
+			sizeof(input->interrupt_descriptor.target.vp_set.bank_contents[0]),
+			&output, sizeof(*output), 0);
 
 	intr_desc = &input->interrupt_descriptor;
-	memset(input, 0, sizeof(*input));
 	input->partition_id = hv_current_partition_id;
 	input->device_id = device_id.as_uint64;
 	intr_desc->interrupt_type = HV_X64_INTERRUPT_TYPE_FIXED;
@@ -40,7 +40,6 @@ static int hv_map_interrupt(union hv_device_id device_id, bool level,
 	else
 		intr_desc->trigger_mode = HV_INTERRUPT_TRIGGER_MODE_EDGE;
 
-	intr_desc->target.vp_set.valid_bank_mask = 0;
 	intr_desc->target.vp_set.format = HV_GENERIC_SET_SPARSE_4K;
 	nr_bank = cpumask_to_vpset(&(intr_desc->target.vp_set), cpumask_of(cpu));
 	if (nr_bank < 0) {
@@ -77,9 +76,8 @@ static int hv_unmap_interrupt(u64 id, struct hv_interrupt_entry *old_entry)
 	u64 status;
 
 	local_irq_save(flags);
-	input = *this_cpu_ptr(hyperv_pcpu_input_arg);
 
-	memset(input, 0, sizeof(*input));
+	hv_hvcall_in(&input, sizeof(*input));
 	intr_entry = &input->interrupt_entry;
 	input->partition_id = hv_current_partition_id;
 	input->device_id = id;
-- 
2.25.1