Re: [PATCHv6 17/30] x86/tdx: Port I/O: add runtime hypercalls

[Thomas Gleixner]

On Wed, Mar 16 2022 at 05:08, Kirill A. Shutemov wrote:
> +static bool handle_in(struct pt_regs *regs, int size, int port)
> +{
> +	struct tdx_hypercall_args args = {
> +		.r10 = TDX_HYPERCALL_STANDARD,
> +		.r11 = hcall_func(EXIT_REASON_IO_INSTRUCTION),
> +		.r12 = size,
> +		.r13 = PORT_READ,
> +		.r14 = port,
> +	};
> +	bool success;
> +	u64 mask = GENMASK(BITS_PER_BYTE * size, 0);

Reverse fir tree ordering please:

	u64 mask = GENMASK(BITS_PER_BYTE * size, 0);
	bool success;

> +/*
> + * Emulate I/O using hypercall.
> + *
> + * Assumes the IO instruction was using ax, which is enforced
> + * by the standard io.h macros.
> + *
> + * Return True on success or False on failure.
> + */
> +static bool handle_io(struct pt_regs *regs, u32 exit_qual)
> +{
> +	bool in;
> +	int size, port;

Ditto.

Other than that:

Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>