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2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/arch/x86/kvm/hyperv.h
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  * KVM Microsoft Hyper-V emulation
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  *
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@@ -15,14 +16,39 @@
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  *   Amit Shah    <amit.shah@qumranet.com>
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  *   Ben-Ami Yassour <benami@il.ibm.com>
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  *   Andrey Smetanin <asmetanin@virtuozzo.com>
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- *
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- * This work is licensed under the terms of the GNU GPL, version 2.  See
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- * the COPYING file in the top-level directory.
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- *
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  */
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 #ifndef __ARCH_X86_KVM_HYPERV_H__
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 #define __ARCH_X86_KVM_HYPERV_H__
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+
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+#include <linux/kvm_host.h>
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+
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+/*
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+ * The #defines related to the synthetic debugger are required by KDNet, but
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+ * they are not documented in the Hyper-V TLFS because the synthetic debugger
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+ * functionality has been deprecated and is subject to removal in future
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+ * versions of Windows.
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+ */
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+#define HYPERV_CPUID_SYNDBG_VENDOR_AND_MAX_FUNCTIONS	0x40000080
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+#define HYPERV_CPUID_SYNDBG_INTERFACE			0x40000081
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+#define HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES	0x40000082
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+
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+/*
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+ * Hyper-V synthetic debugger platform capabilities
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+ * These are HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES.EAX bits.
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+ */
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+#define HV_X64_SYNDBG_CAP_ALLOW_KERNEL_DEBUGGING	BIT(1)
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+
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+/* Hyper-V Synthetic debug options MSR */
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+#define HV_X64_MSR_SYNDBG_CONTROL		0x400000F1
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+#define HV_X64_MSR_SYNDBG_STATUS		0x400000F2
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+#define HV_X64_MSR_SYNDBG_SEND_BUFFER		0x400000F3
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+#define HV_X64_MSR_SYNDBG_RECV_BUFFER		0x400000F4
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+#define HV_X64_MSR_SYNDBG_PENDING_BUFFER	0x400000F5
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+#define HV_X64_MSR_SYNDBG_OPTIONS		0x400000FF
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+
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+/* Hyper-V HV_X64_MSR_SYNDBG_OPTIONS bits */
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+#define HV_X64_SYNDBG_OPTION_USE_HCALLS		BIT(2)
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 static inline struct kvm_vcpu_hv *vcpu_to_hv_vcpu(struct kvm_vcpu *vcpu)
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 {
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 static inline struct kvm_vcpu *synic_to_vcpu(struct kvm_vcpu_hv_synic *synic)
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 {
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 	return hv_vcpu_to_vcpu(container_of(synic, struct kvm_vcpu_hv, synic));
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+}
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+
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+static inline struct kvm_hv_syndbg *vcpu_to_hv_syndbg(struct kvm_vcpu *vcpu)
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+{
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+	return &vcpu->kvm->arch.hyperv.hv_syndbg;
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 }
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 int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host);
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 void kvm_hv_init_vm(struct kvm *kvm);
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 void kvm_hv_destroy_vm(struct kvm *kvm);
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 int kvm_vm_ioctl_hv_eventfd(struct kvm *kvm, struct kvm_hyperv_eventfd *args);
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+int kvm_vcpu_ioctl_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
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+				struct kvm_cpuid_entry2 __user *entries);
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 #endif