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mshv: add function to query vmm capabilities #244

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Merged
merged 1 commit into from
Aug 6, 2025
Merged

mshv: add function to query vmm capabilities #244

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1 change: 1 addition & 0 deletions hv-headers/hvgdk_mini.h
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Original file line number Diff line number Diff line change
Expand Up @@ -173,6 +173,7 @@ struct hv_u128 {
#define HVCALL_COMPLETE_ISOLATED_IMPORT 0x00f1
#define HVCALL_ISSUE_SNP_PSP_GUEST_REQUEST 0x00f2
#define HVCALL_GET_VP_CPUID_VALUES 0x00f4
#define HVCALL_GET_PARTITION_PROPERTY_EX 0x0101

/* HvFlushGuestPhysicalAddressList, HvExtCallMemoryHeatHint hypercall */
union hv_gpa_page_range {
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36 changes: 36 additions & 0 deletions hv-headers/hvhdk.h
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Expand Up @@ -471,6 +471,42 @@ struct hv_input_set_partition_property {
__u64 property_value;
} __packed;

union hv_partition_property_arg {
__u64 as_uint64;
struct {
union {
__u32 arg;
__u32 vp_index;
};
__u16 reserved0;
__u8 reserved1;
__u8 object_type;
};
} __packed;

struct hv_input_get_partition_property_ex {
__u64 partition_id;
__u32 property_code; /* enum hv_partition_property_code */
__u32 padding;
union {
union hv_partition_property_arg arg_data;
__u64 arg;
};
} __packed;

#define HV_PARTITION_PROPERTY_EX_MAX_VAR_SIZE \
(HV_HYP_PAGE_SIZE - sizeof(struct hv_input_get_partition_property_ex))

union hv_partition_property_ex {
__u8 buffer[HV_PARTITION_PROPERTY_EX_MAX_VAR_SIZE];
struct hv_partition_property_vmm_capabilities vmm_capabilities;
/* More fields to be filled in when needed */
} __packed;

struct hv_output_get_partition_property_ex {
union hv_partition_property_ex property_value;
} __packed;

struct hv_cpuid_leaf_info {
__u32 eax;
__u32 ecx;
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26 changes: 26 additions & 0 deletions hv-headers/hvhdk_mini.h
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Expand Up @@ -88,8 +88,14 @@ enum hv_partition_property_code {

/* Nested virtualization properties */
HV_PARTITION_PROPERTY_PROCESSOR_VIRTUALIZATION_FEATURES = 0x00080000,

/* Extended properties with larger property values */
HV_PARTITION_PROPERTY_VMM_CAPABILITIES = 0x00090007,
};

#define HV_PARTITION_VMM_CAPABILITIES_BANK_COUNT 1
#define HV_PARTITION_VMM_CAPABILITIES_RESERVED_BITFIELD_COUNT 59

/* HV Map GPA (Guest Physical Address) Flags */
#define HV_MAP_GPA_PERMISSIONS_NONE 0x0
#define HV_MAP_GPA_READABLE 0x1
Expand Down Expand Up @@ -164,4 +170,24 @@ struct hv_input_complete_isolated_import {
union hv_partition_complete_isolated_import_data import_data;
} __packed;

struct hv_partition_property_vmm_capabilities {
__u16 bank_count;
__u16 reserved[3];
union {
__u64 as_uint64[HV_PARTITION_VMM_CAPABILITIES_BANK_COUNT];
struct {
__u64 map_gpa_preserve_adjustable : 1;
__u64 vmm_can_provide_overlay_gpfn : 1;
__u64 vp_affinity_property : 1;
#if defined(__aarch64__)
__u64 vmm_can_provide_gic_overlay_locations : 1;
#else
__u64 reservedbit3 : 1;
#endif
__u64 assignable_synthetic_proc_features : 1;
__u64 reserved0 : HV_PARTITION_VMM_CAPABILITIES_RESERVED_BITFIELD_COUNT;
} __packed;
};
} __packed;

#endif /* _HVHDK_MINI_H */
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