linux-kernel - Re: [PATCH 3/7] x86/fpu/xstate: Add supervisor PASID state for ENQCMD feature

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Message-ID: <87v9lmsdhk.fsf@nanos.tec.linutronix.de>
Date:   Sun, 26 Apr 2020 13:17:11 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Fenghua Yu <fenghua.yu@...el.com>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>, H Peter Anvin <hpa@...or.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Jacob Jun Pan <jacob.jun.pan@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Sohil Mehta <sohil.mehta@...el.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>,
        iommu@...ts.linux-foundation.org,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>
Subject: Re: [PATCH 3/7] x86/fpu/xstate: Add supervisor PASID state for ENQCMD feature

Fenghua Yu <fenghua.yu@...el.com> writes:
> From: Yu-cheng Yu <yu-cheng.yu@...el.com>
>
> The IA32_PASID MSR is used when a task submits work via the ENQCMD
> instruction.

Is used?

> The per task MSR is stored in the task's supervisor FPU

per task MSR? Lot's of MSRs ....

> PASID state and is context switched by XSAVES/XRSTORS.
>