RE: [RFC PATCH V2 06/18] x86/hyperv: Use vmmcall to implement hvcall in sev-snp enlightened guest

[Dexuan Cui]

> From: Tianyu Lan <ltykernel@xxxxxxxxx>
> Sent: Friday, November 18, 2022 7:46 PM
> --- a/arch/x86/include/asm/mshyperv.h
> +++ b/arch/x86/include/asm/mshyperv.h
> @@ -45,16 +45,25 @@ static inline u64 hv_do_hypercall(u64 control, void
> *input, void *output)
>  	u64 hv_status;
> 
>  #ifdef CONFIG_X86_64
> -	if (!hv_hypercall_pg)
> -		return U64_MAX;
> +	if (hv_isolation_type_en_snp()) {
> +		__asm__ __volatile__("mov %4, %%r8\n"
> +				"vmmcall"
> +				: "=a" (hv_status), ASM_CALL_CONSTRAINT,
> +				"+c" (control), "+d" (input_address)
> +				:  "r" (output_address)
> +				: "cc", "memory", "r8", "r9", "r10", "r11");

Add a "return hv_status;" here to avoid chaning the indentation below?

> +	} else {
> +		if (!hv_hypercall_pg)
> +			return U64_MAX;
> 
> -	__asm__ __volatile__("mov %4, %%r8\n"
> -			     CALL_NOSPEC
> -			     : "=a" (hv_status), ASM_CALL_CONSTRAINT,
> -			       "+c" (control), "+d" (input_address)
> -			     :  "r" (output_address),
> -				THUNK_TARGET(hv_hypercall_pg)
> -			     : "cc", "memory", "r8", "r9", "r10", "r11");
> +		__asm__ __volatile__("mov %4, %%r8\n"
> +				CALL_NOSPEC
> +				: "=a" (hv_status), ASM_CALL_CONSTRAINT,
> +				"+c" (control), "+d" (input_address)
> +				:  "r" (output_address),
> +					THUNK_TARGET(hv_hypercall_pg)
> +				: "cc", "memory", "r8", "r9", "r10", "r11");
> +	}
>  #else