linux-kernel - Re: [PATCH v1 3/3] x86/entry: Set FRED RSP0 on return to userspace instead of context switch

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Message-ID: <397D7CEC-F743-4155-AB54-DED1D85FADFA@zytor.com>
Date: Fri, 09 Aug 2024 15:43:58 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Xin Li <xin@...or.com>, Nikolay Borisov <nik.borisov@...e.com>,
        linux-kernel@...r.kernel.org
CC: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, peterz@...radead.org,
        andrew.cooper3@...rix.com, seanjc@...gle.com
Subject: Re: [PATCH v1 3/3] x86/entry: Set FRED RSP0 on return to userspace instead of context switch

On August 9, 2024 10:37:08 AM PDT, Xin Li <xin@...or.com> wrote:
>On 8/9/2024 3:45 AM, Nikolay Borisov wrote:
>>> +#define TIF_LOAD_USER_STATES    30    /* Load user level states */
>> 
>> Wouldn't something along the l ines of TIF_LOAD_FRED_RSP be more descriptive, or it's expected that this flag can cover more state in the future?
>
>Sean mentioned TIF_LOAD_FRED_RSP, however we also have FRED SSP0, which
>needs to be handled similarly.
>
>And we also want to use it to cover future states.

It is very likely that there will be additional uses of this beyond FRED.