linux-kernel - Re: [PATCH 4/7] x86/msr-index: Define IA32

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Message-ID: <20200427205050.GE242333@romley-ivt3.sc.intel.com>
Date:   Mon, 27 Apr 2020 13:50:51 -0700
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     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>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        x86 <x86@...nel.org>, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 4/7] x86/msr-index: Define IA32_PASID MSR

On Sun, Apr 26, 2020 at 01:22:00PM +0200, Thomas Gleixner wrote:
> Fenghua Yu <fenghua.yu@...el.com> writes:
> 
> > The IA32_PASID MSR (0xd93) contains the Process Address Space Identifier
> > (PASID), a 20-bit value. Bit 31 must be set to indicate the value
> > programmed in the MSR is valid. Hardware uses PASID to identify which
> > process submits the work and direct responses to the right process.
> 
> No. It does not identify the process. It identifies the process' address
> space as the name says.
> 
> Please provide coherent and precise information.

Ok. Will change to address space identification.

Thanks.

-Fenghua