[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <Y0bhkVYfYhzkmrjp@zn.tnic>
Date: Wed, 12 Oct 2022 17:47:29 +0200
From: Borislav Petkov <bp@...en8.de>
To: Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
Shuah Khan <shuah@...nel.org>,
Jonathan Corbet <corbet@....net>,
"H . Peter Anvin" <hpa@...or.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
Tony Luck <tony.luck@...el.com>,
Kai Huang <kai.huang@...el.com>,
Wander Lairson Costa <wander@...hat.com>,
Isaku Yamahata <isaku.yamahata@...il.com>,
marcelo.cerri@...onical.com, tim.gardner@...onical.com,
khalid.elmously@...onical.com, philip.cox@...onical.com,
linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
linux-doc@...r.kernel.org
Subject: Re: [PATCH v14 2/3] virt: Add TDX guest driver
On Wed, Sep 28, 2022 at 02:55:34PM -0700, Kuppuswamy Sathyanarayanan wrote:
> +static long tdx_get_report(void __user *argp)
> +{
> + u8 *reportdata, *tdreport;
> + struct tdx_report_req req;
> + long ret;
> +
> + if (copy_from_user(&req, argp, sizeof(req)))
> + return -EFAULT;
> +
> + /*
> + * Per TDX Module 1.0 specification, section titled
> + * "TDG.MR.REPORT", REPORTDATA length is fixed as
> + * TDX_REPORTDATA_LEN, TDREPORT length is fixed as
> + * TDX_REPORT_LEN, and TDREPORT subtype is fixed as 0.
> + */
> + if (req.subtype || req.rpd_len != TDX_REPORTDATA_LEN ||
> + req.tdr_len != TDX_REPORT_LEN)
> + return -EINVAL;
> +
> + if (memchr_inv(req.reserved, 0, sizeof(req.reserved)))
I'm guessing we should issue something here to userspace to let it know
why the it fails getting the report.
Otherwise it is starting to look good and boring. :)
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
Powered by blists - more mailing lists