linux-kernel - Re: [PATCH 0/7] x86: tag application address space for devices

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Message-ID: <20200422204117.GB229170@romley-ivt3.sc.intel.com>
Date:   Wed, 22 Apr 2020 13:41:17 -0700
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        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
Subject: Re: [PATCH 0/7] x86: tag application address space for devices

On Mon, Mar 30, 2020 at 12:33:01PM -0700, Fenghua Yu wrote:
> Typical hardware devices require a driver stack to translate application
> buffers to hardware addresses, and a kernel-user transition to notify the
> hardware of new work. What if both the translation and transition overhead
> could be eliminated? This is what Shared Virtual Address (SVA) and ENQCMD
> enabled hardware like Data Streaming Accelerator (DSA) aims to achieve.
> Applications map portals in their local-address-space and directly submit
> work to them using a new instruction.
> 
Hi, maintainers,

Any comment on this series?

Thanks.

-Fenghua