RE: [PATCH v3 2/5] x86/hyperv: Add VTL specific structs and hypercalls

Michael Kelley (LINUX)
2023-03-26T15:05:17Z

From: Saurabh Sengar <ssengar@linux.microsoft.com> Sent: Monday, March 20, 2023 3:04 AM
>
> Add structs and hypercalls required to enable VTL support on x86.
>
> Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
> ---
> arch/x86/include/asm/hyperv-tlfs.h | 75 ++++++++++++++++++++++++++++++
> include/asm-generic/hyperv-tlfs.h | 4 ++
> 2 files changed, 79 insertions(+)
>
> diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
> index 0b73a809e9e1..0b0b4e9a4318 100644
> --- a/arch/x86/include/asm/hyperv-tlfs.h
> +++ b/arch/x86/include/asm/hyperv-tlfs.h
> @@ -713,6 +713,81 @@ union hv_msi_entry {
> } __packed;
> };
>
> +struct hv_x64_segment_register {
> + __u64 base;
> + __u32 limit;
> + __u16 selector;
> + union {
> + struct {
> + __u16 segment_type : 4;
> + __u16 non_system_segment : 1;
> + __u16 descriptor_privilege_level : 2;
> + __u16 present : 1;
> + __u16 reserved : 4;
> + __u16 available : 1;
> + __u16 _long : 1;
> + __u16 _default : 1;
> + __u16 granularity : 1;
> + } __packed;
> + __u16 attributes;
> + };
> +} __packed;
> +
> +struct hv_x64_table_register {
> + __u16 pad[3];
> + __u16 limit;
> + __u64 base;
> +} __packed;
> +
> +struct hv_init_vp_context {
> + u64 rip;
> + u64 rsp;
> + u64 rflags;
> +
> + struct hv_x64_segment_register cs;
> + struct hv_x64_segment_register ds;
> + struct hv_x64_segment_register es;
> + struct hv_x64_segment_register fs;
> + struct hv_x64_segment_register gs;
> + struct hv_x64_segment_register ss;
> + struct hv_x64_segment_register tr;
> + struct hv_x64_segment_register ldtr;
> +
> + struct hv_x64_table_register idtr;
> + struct hv_x64_table_register gdtr;
> +
> + u64 efer;
> + u64 cr0;
> + u64 cr3;
> + u64 cr4;
> + u64 msr_cr_pat;
> +} __packed;
> +
> +union hv_input_vtl {
> + u8 as_uint8;
> + struct {
> + u8 target_vtl: 4;
> + u8 use_target_vtl: 1;
> + u8 reserved_z: 3;
> + };
> +} __packed;
> +
> +struct hv_enable_vp_vtl {
> + u64 partition_id;
> + u32 vp_index;
> + union hv_input_vtl target_vtl;
> + u8 mbz0;
> + u16 mbz1;
> + struct hv_init_vp_context vp_context;
> +} __packed;
> +
> +struct hv_get_vp_from_apic_id_in {
> + u64 partition_id;
> + union hv_input_vtl target_vtl;
> + u8 res[7];
> + u32 apic_ids[];
> +} __packed;
> +
> #include <asm-generic/hyperv-tlfs.h>
>
> #endif
> diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
> index b870983596b9..87258341fd7c 100644
> --- a/include/asm-generic/hyperv-tlfs.h
> +++ b/include/asm-generic/hyperv-tlfs.h
> @@ -146,6 +146,7 @@ union hv_reference_tsc_msr {
> /* Declare the various hypercall operations. */
> #define HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE 0x0002
> #define HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST 0x0003
> +#define HVCALL_ENABLE_VP_VTL 0x000f
> #define HVCALL_NOTIFY_LONG_SPIN_WAIT 0x0008
> #define HVCALL_SEND_IPI 0x000b
> #define HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX 0x0013
> @@ -165,6 +166,8 @@ union hv_reference_tsc_msr {
> #define HVCALL_MAP_DEVICE_INTERRUPT 0x007c
> #define HVCALL_UNMAP_DEVICE_INTERRUPT 0x007d
> #define HVCALL_RETARGET_INTERRUPT 0x007e
> +#define HVCALL_START_VP 0x0099
> +#define HVCALL_GET_VP_ID_FROM_APIC_ID 0x009a
> #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE 0x00af
> #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST 0x00b0
> #define HVCALL_MODIFY_SPARSE_GPA_PAGE_HOST_VISIBILITY 0x00db
> @@ -218,6 +221,7 @@ enum HV_GENERIC_SET_FORMAT {
> #define HV_STATUS_INVALID_PORT_ID 17
> #define HV_STATUS_INVALID_CONNECTION_ID 18
> #define HV_STATUS_INSUFFICIENT_BUFFERS 19
> +#define HV_STATUS_VTL_ALREADY_ENABLED 134
>
> /*
> * The Hyper-V TimeRefCount register and the TSC
> --
> 2.34.1

Reviewed-by: Michael Kelley <mikelley@microsoft.com>