linux-kernel - Re: [PATCHv5 17/30] x86/tdx: Port I/O: add runtime hypercalls

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Date:   Tue, 8 Mar 2022 13:30:46 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        luto@...nel.org, peterz@...radead.org
Cc:     sathyanarayanan.kuppuswamy@...ux.intel.com, aarcange@...hat.com,
        ak@...ux.intel.com, dan.j.williams@...el.com, david@...hat.com,
        hpa@...or.com, jgross@...e.com, jmattson@...gle.com,
        joro@...tes.org, jpoimboe@...hat.com, knsathya@...nel.org,
        pbonzini@...hat.com, sdeep@...are.com, seanjc@...gle.com,
        tony.luck@...el.com, vkuznets@...hat.com, wanpengli@...cent.com,
        thomas.lendacky@....com, brijesh.singh@....com, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv5 17/30] x86/tdx: Port I/O: add runtime hypercalls

On 3/2/22 06:27, Kirill A. Shutemov wrote:
> This series has no special handling for ioperm(). Users will be able
> to successfully request I/O permissions but will induce a #VE on
> their> first I/O instruction.

How will this be visible to users or user applications?

> +static bool handle_io(struct pt_regs *regs, u32 exit_qual)
> +{
> +	bool in;
> +	int size, port;
> +
> +	if (VE_IS_IO_STRING(exit_qual))
> +		return false;
> +
> +	in   = VE_IS_IO_IN(exit_qual);
> +	size = VE_GET_IO_SIZE(exit_qual);
> +	port = VE_GET_PORT_NUM(exit_qual);
> +
> +
> +	if (in)
> +		return handle_in(regs, size, port);
> +	else
> +		return handle_out(regs, size, port);
> +}

Some extra whitespace snuck in there.

With the question answered and whitespace fixed:

Reviewed-by: Dave Hansen <dave.hansen@...ux.intel.com>