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Message-ID: <89804c89-b696-a14d-5a8f-67aee52cd141@intel.com>
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>
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