diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index df98b630476935c9e234976d8f953ff6c1ca865e..48e5d11972958345f3b8d65480f1469c147b44df 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -4791,3 +4791,10 @@ CPU when the exception is taken. If this virtual SError is taken to EL1 using
AArch64, this value will be reported in the ISS field of ESR_ELx.
See KVM_CAP_VCPU_EVENTS for more details.
+8.20 KVM_CAP_HYPERV_SEND_IPI
+
+Architectures: x86
+
+This capability indicates that KVM supports paravirtualized Hyper-V IPI send
+hypercalls:
+HvCallSendSyntheticClusterIpi, HvCallSendSyntheticClusterIpiEx.
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index cb69ca2223faf9f0cbc394ed01e104978a1c6e18..bad4bffdc8b9fe290ecad5997a961c2cc1eea94e 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -1405,6 +1405,107 @@ static u64 kvm_hv_flush_tlb(struct kvm_vcpu *current_vcpu, u64 ingpa,
((u64)rep_cnt << HV_HYPERCALL_REP_COMP_OFFSET);
}
+static u64 kvm_hv_send_ipi(struct kvm_vcpu *current_vcpu, u64 ingpa, u64 outgpa,
+ bool ex, bool fast)
+{
+ struct kvm *kvm = current_vcpu->kvm;
+ struct kvm_hv *hv = &kvm->arch.hyperv;
+ struct hv_send_ipi_ex send_ipi_ex;
+ struct hv_send_ipi send_ipi;
+ struct kvm_vcpu *vcpu;
+ unsigned long valid_bank_mask;
+ u64 sparse_banks[64];
+ int sparse_banks_len, bank, i, sbank;
+ struct kvm_lapic_irq irq = {.delivery_mode = APIC_DM_FIXED};
+ bool all_cpus;
+
+ if (!ex) {
+ if (!fast) {
+ if (unlikely(kvm_read_guest(kvm, ingpa, &send_ipi,
+ sizeof(send_ipi))))
+ return HV_STATUS_INVALID_HYPERCALL_INPUT;
+ sparse_banks[0] = send_ipi.cpu_mask;
+ irq.vector = send_ipi.vector;
+ } else {
+ /* 'reserved' part of hv_send_ipi should be 0 */
+ if (unlikely(ingpa >> 32 != 0))
+ return HV_STATUS_INVALID_HYPERCALL_INPUT;
+ sparse_banks[0] = outgpa;
+ irq.vector = (u32)ingpa;
+ }
+ all_cpus = false;
+ valid_bank_mask = BIT_ULL(0);
+
+ trace_kvm_hv_send_ipi(irq.vector, sparse_banks[0]);
+ } else {
+ if (unlikely(kvm_read_guest(kvm, ingpa, &send_ipi_ex,
+ sizeof(send_ipi_ex))))
+ return HV_STATUS_INVALID_HYPERCALL_INPUT;
+
+ trace_kvm_hv_send_ipi_ex(send_ipi_ex.vector,
+ send_ipi_ex.vp_set.format,
+ send_ipi_ex.vp_set.valid_bank_mask);
+
+ irq.vector = send_ipi_ex.vector;
+ valid_bank_mask = send_ipi_ex.vp_set.valid_bank_mask;
+ sparse_banks_len = bitmap_weight(&valid_bank_mask, 64) *
+ sizeof(sparse_banks[0]);
+
+ all_cpus = send_ipi_ex.vp_set.format == HV_GENERIC_SET_ALL;
+
+ if (!sparse_banks_len)
+ goto ret_success;
+
+ if (!all_cpus &&
+ kvm_read_guest(kvm,
+ ingpa + offsetof(struct hv_send_ipi_ex,
+ vp_set.bank_contents),
+ sparse_banks,
+ sparse_banks_len))
+ return HV_STATUS_INVALID_HYPERCALL_INPUT;
+ }
+
+ if ((irq.vector < HV_IPI_LOW_VECTOR) ||
+ (irq.vector > HV_IPI_HIGH_VECTOR))
+ return HV_STATUS_INVALID_HYPERCALL_INPUT;
+
+ if (all_cpus || atomic_read(&hv->num_mismatched_vp_indexes)) {
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ if (all_cpus || hv_vcpu_in_sparse_set(
+ &vcpu->arch.hyperv, sparse_banks,
+ valid_bank_mask)) {
+ /* We fail only when APIC is disabled */
+ kvm_apic_set_irq(vcpu, &irq, NULL);
+ }
+ }
+ goto ret_success;
+ }
+
+ /*
+ * num_mismatched_vp_indexes is zero so every vcpu has
+ * vp_index == vcpu_idx.
+ */
+ sbank = 0;
+ for_each_set_bit(bank, (unsigned long *)&valid_bank_mask, 64) {
+ for_each_set_bit(i, (unsigned long *)&sparse_banks[sbank], 64) {
+ u32 vp_index = bank * 64 + i;
+ struct kvm_vcpu *vcpu =
+ get_vcpu_by_vpidx(kvm, vp_index);
+
+ /* Unknown vCPU specified */
+ if (!vcpu)
+ continue;
+
+ /* We fail only when APIC is disabled */
+ kvm_apic_set_irq(vcpu, &irq, NULL);
+ }
+ sbank++;
+ }
+
+ret_success:
+ return HV_STATUS_SUCCESS;
+}
+
bool kvm_hv_hypercall_enabled(struct kvm *kvm)
{
return READ_ONCE(kvm->arch.hyperv.hv_hypercall) & HV_X64_MSR_HYPERCALL_ENABLE;
@@ -1574,6 +1675,20 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
}
ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, true);
break;
+ case HVCALL_SEND_IPI:
+ if (unlikely(rep)) {
+ ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
+ break;
+ }
+ ret = kvm_hv_send_ipi(vcpu, ingpa, outgpa, false, fast);
+ break;
+ case HVCALL_SEND_IPI_EX:
+ if (unlikely(fast || rep)) {
+ ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
+ break;
+ }
+ ret = kvm_hv_send_ipi(vcpu, ingpa, outgpa, true, false);
+ break;
default:
ret = HV_STATUS_INVALID_HYPERCALL_CODE;
break;
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 0f997683404fad647b55abd7ad375a6c499dc75c..0659465a745c9fb0ae50219884234cb945a4ab37 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -1418,6 +1418,48 @@ TRACE_EVENT(kvm_hv_flush_tlb_ex,
__entry->valid_bank_mask, __entry->format,
__entry->address_space, __entry->flags)
);
+
+/*
+ * Tracepoints for kvm_hv_send_ipi.
+ */
+TRACE_EVENT(kvm_hv_send_ipi,
+ TP_PROTO(u32 vector, u64 processor_mask),
+ TP_ARGS(vector, processor_mask),
+
+ TP_STRUCT__entry(
+ __field(u32, vector)
+ __field(u64, processor_mask)
+ ),
+
+ TP_fast_assign(
+ __entry->vector = vector;
+ __entry->processor_mask = processor_mask;
+ ),
+
+ TP_printk("vector %x processor_mask 0x%llx",
+ __entry->vector, __entry->processor_mask)
+);
+
+TRACE_EVENT(kvm_hv_send_ipi_ex,
+ TP_PROTO(u32 vector, u64 format, u64 valid_bank_mask),
+ TP_ARGS(vector, format, valid_bank_mask),
+
+ TP_STRUCT__entry(
+ __field(u32, vector)
+ __field(u64, format)
+ __field(u64, valid_bank_mask)
+ ),
+
+ TP_fast_assign(
+ __entry->vector = vector;
+ __entry->format = format;
+ __entry->valid_bank_mask = valid_bank_mask;
+ ),
+
+ TP_printk("vector %x format %llx valid_bank_mask 0x%llx",
+ __entry->vector, __entry->format,
+ __entry->valid_bank_mask)
+);
#endif /* _TRACE_KVM_H */
#undef TRACE_INCLUDE_PATH
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1f3f95557703da6efbc24bab4c47a8aab6a5ae49..20a667da0a31ac25001a612e314bb969477f29bb 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2912,6 +2912,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_HYPERV_VP_INDEX:
case KVM_CAP_HYPERV_EVENTFD:
case KVM_CAP_HYPERV_TLBFLUSH:
+ case KVM_CAP_HYPERV_SEND_IPI:
case KVM_CAP_PCI_SEGMENT:
case KVM_CAP_DEBUGREGS:
case KVM_CAP_X86_ROBUST_SINGLESTEP:
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 7f2ff3a7699573c600eb745715656501b2a08fe4..7785678caedb9542772a3effdf3b662643fc6777 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -955,6 +955,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_ARM_INJECT_SERROR_ESR 158
#define KVM_CAP_MSR_PLATFORM_INFO 159
#define KVM_CAP_PPC_NESTED_HV 160
+#define KVM_CAP_HYPERV_SEND_IPI 161
#ifdef KVM_CAP_IRQ_ROUTING