linux-kernel - Re: [PATCH v4 2/5] x86/hyperv: Add VTL specific structs and hypercalls

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Message-ID: <20230406135113.GB1317@skinsburskii.localdomain>
Date:   Thu, 6 Apr 2023 06:51:13 -0700
From:   Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>
To:     Saurabh Sengar <ssengar@...ux.microsoft.com>
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, arnd@...db.de, tiala@...rosoft.com,
        mikelley@...rosoft.com, linux-kernel@...r.kernel.org,
        linux-hyperv@...r.kernel.org, linux-arch@...r.kernel.org,
        jgross@...e.com, mat.jonczyk@...pl
Subject: Re: [PATCH v4 2/5] x86/hyperv: Add VTL specific structs and
 hypercalls

On Tue, Apr 04, 2023 at 02:01:01AM -0700, Saurabh Sengar wrote:
> Add structs and hypercalls required to enable VTL support on x86.
> 
> Signed-off-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
> Reviewed-by: Michael Kelley <mikelley@...rosoft.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;

Ideally they arch-size types naming should be consistent: either with underscores or
without.
The majority of cases in this file are without underscores.

Reviewed-by: Stanislav Kinsburskii <stanislav.kinsburskii@...il.com>

> +	__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