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a="239419660" X-IronPort-AV: E=Sophos;i="5.78,428,1599548400"; d="scan'208";a="239419660" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Dec 2020 12:41:52 -0800 IronPort-SDR: vMqcelFZkNKz8vAko4tCHOPMa2KxvD9eHIN8YBYVMFXo3hMfi9PxbzJyIdr5mWvvQ7LKO6vevf Zi2Eee9tuGIw== X-IronPort-AV: E=Sophos;i="5.78,428,1599548400"; d="scan'208";a="558185094" Received: from jlcowper-mobl1.amr.corp.intel.com (HELO [10.212.113.48]) ([10.212.113.48]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Dec 2020 12:41:51 -0800 Subject: Re: [NEEDS-REVIEW] [PATCH V3 04/10] x86/pks: Preserve the PKRS MSR on context switch To: ira.weiny@intel.com, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Andy Lutomirski , Peter Zijlstra , Dave Hansen Cc: Fenghua Yu , x86@kernel.org, linux-kernel@vger.kernel.org, Andrew Morton , linux-doc@vger.kernel.org, linux-nvdimm@lists.01.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Dan Williams , Greg KH References: <20201106232908.364581-1-ira.weiny@intel.com> <20201106232908.364581-5-ira.weiny@intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201106232908.364581-5-ira.weiny@intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/6/20 3:29 PM, ira.weiny@intel.com wrote: > void disable_TSC(void) > @@ -644,6 +668,8 @@ void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p) > > if ((tifp ^ tifn) & _TIF_SLD) > switch_to_sld(tifn); > + > + pks_sched_in(); > } Does the selftest for this ever actually schedule()? I see it talking about context switching, but I don't immediately see how it would.