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

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Message-ID: <87sggqsd9j.fsf@nanos.tec.linutronix.de>
Date:   Sun, 26 Apr 2020 13:22:00 +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, Fenghua Yu <fenghua.yu@...el.com>
Subject: Re: [PATCH 4/7] x86/msr-index: Define IA32_PASID MSR

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.

Thanks,

        tglx