linux-kernel - Re: [PATCH v7 03/16] virt: sev-guest: Add SNP guest request structure

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Date: Fri, 26 Jan 2024 15:16:17 -0600
From: Tom Lendacky <thomas.lendacky@....com>
To: Nikunj A Dadhania <nikunj@....com>, linux-kernel@...r.kernel.org,
 x86@...nel.org, kvm@...r.kernel.org
Cc: bp@...en8.de, mingo@...hat.com, tglx@...utronix.de,
 dave.hansen@...ux.intel.com, dionnaglaze@...gle.com, pgonda@...gle.com,
 seanjc@...gle.com, pbonzini@...hat.com
Subject: Re: [PATCH v7 03/16] virt: sev-guest: Add SNP guest request structure

On 12/20/23 09:13, Nikunj A Dadhania wrote:
> Add a snp_guest_req structure to simplify the function arguments. The
> structure will be used to call the SNP Guest message request API
> instead of passing a long list of parameters.
> 
> Update snp_issue_guest_request() prototype to include the new guest request
> structure and move the prototype to sev_guest.h.
> 
> Signed-off-by: Nikunj A Dadhania <nikunj@....com>
> Tested-by: Peter Gonda <pgonda@...gle.com>
> ---
>   .../x86/include/asm}/sev-guest.h              |  18 +++
>   arch/x86/include/asm/sev.h                    |   8 --
>   arch/x86/kernel/sev.c                         |  15 ++-
>   drivers/virt/coco/sev-guest/sev-guest.c       | 108 +++++++++++-------
>   4 files changed, 93 insertions(+), 56 deletions(-)
>   rename {drivers/virt/coco/sev-guest => arch/x86/include/asm}/sev-guest.h (78%)
> 
> diff --git a/drivers/virt/coco/sev-guest/sev-guest.h b/arch/x86/include/asm/sev-guest.h
> similarity index 78%
> rename from drivers/virt/coco/sev-guest/sev-guest.h
> rename to arch/x86/include/asm/sev-guest.h
> index ceb798a404d6..27cc15ad6131 100644
> --- a/drivers/virt/coco/sev-guest/sev-guest.h
> +++ b/arch/x86/include/asm/sev-guest.h
> @@ -63,4 +63,22 @@ struct snp_guest_msg {
>   	u8 payload[4000];
>   } __packed;
>   
> +struct snp_guest_req {
> +	void *req_buf;
> +	size_t req_sz;
> +
> +	void *resp_buf;
> +	size_t resp_sz;
> +
> +	void *data;
> +	size_t data_npages;
> +
> +	u64 exit_code;
> +	unsigned int vmpck_id;
> +	u8 msg_version;
> +	u8 msg_type;
> +};
> +
> +int snp_issue_guest_request(struct snp_guest_req *req, struct snp_req_data *input,
> +			    struct snp_guest_request_ioctl *rio);

This seems odd to have in this file. It's arch/x86/kernel/sev.c that 
exports the call and so this should probably stay in 
arch/x86/include/asm/sev.h and put the struct there, too, no?

Thanks,
Tom

>   #endif /* __VIRT_SEVGUEST_H__ */
> diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h
> index 5b4a1ce3d368..78465a8c7dc6 100644
> --- a/arch/x86/include/asm/sev.h
> +++ b/arch/x86/include/asm/sev.h
> @@ -97,8 +97,6 @@ extern bool handle_vc_boot_ghcb(struct pt_regs *regs);
>   struct snp_req_data {
>   	unsigned long req_gpa;
>   	unsigned long resp_gpa;
> -	unsigned long data_gpa;
> -	unsigned int data_npages;
>   };
>   
>   struct sev_guest_platform_data {
> @@ -209,7 +207,6 @@ void snp_set_memory_private(unsigned long vaddr, unsigned long npages);
>   void snp_set_wakeup_secondary_cpu(void);
>   bool snp_init(struct boot_params *bp);
>   void __init __noreturn snp_abort(void);
> -int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio);
>   void snp_accept_memory(phys_addr_t start, phys_addr_t end);
>   u64 snp_get_unsupported_features(u64 status);
>   u64 sev_get_status(void);
> @@ -233,11 +230,6 @@ static inline void snp_set_memory_private(unsigned long vaddr, unsigned long npa
>   static inline void snp_set_wakeup_secondary_cpu(void) { }
>   static inline bool snp_init(struct boot_params *bp) { return false; }
>   static inline void snp_abort(void) { }
> -static inline int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio)
> -{
> -	return -ENOTTY;
> -}
> -
>   static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { }
>   static inline u64 snp_get_unsupported_features(u64 status) { return 0; }
>   static inline u64 sev_get_status(void) { return 0; }