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From: Thomas Gleixner <tglx@linutronix.de>
To: Fenghua Yu <fenghua.yu@intel.com>, Ingo Molnar <mingo@redhat.com>,
	Borislav Petkov <bp@alien8.de>, H Peter Anvin <hpa@zytor.com>,
	David Woodhouse <dwmw2@infradead.org>,
	Lu Baolu <baolu.lu@linux.intel.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Tony Luck <tony.luck@intel.com>, Ashok Raj <ashok.raj@intel.com>,
	Jacob Jun Pan <jacob.jun.pan@intel.com>,
	Dave Jiang <dave.jiang@intel.com>,
	Sohil Mehta <sohil.mehta@intel.com>,
	Ravi V Shankar <ravi.v.shankar@intel.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>,
	iommu@lists.linux-foundation.org,
	Fenghua Yu <fenghua.yu@intel.com>
Subject: Re: [PATCH 2/7] x86/cpufeatures: Enumerate ENQCMD and ENQCMDS instructions
Date: Sun, 26 Apr 2020 13:06:33 +0200	[thread overview]
Message-ID: <87y2qisdza.fsf@nanos.tec.linutronix.de> (raw)
In-Reply-To: <1585596788-193989-3-git-send-email-fenghua.yu@intel.com>

Fenghua Yu <fenghua.yu@intel.com> writes:
> A user space application can execute ENQCMD instruction to submit work
> to device. The kernel executes ENQCMDS instruction to submit work to
> device.

So a user space application _can_ execute ENQCMD and the kernel
executes ENQCMDS. And both submit work to device.

> There is a lot of other enabling needed for the instructions to actually
> be usable in user space and the kernel, and that enabling is coming later
> in the series and in device drivers.

That's important information to the enumeration of the instructions in
which way?

Thanks,

        tglx

WARNING: multiple messages have this Message-ID (diff)
From: Thomas Gleixner <tglx@linutronix.de>
To: Fenghua Yu <fenghua.yu@intel.com>, Ingo Molnar <mingo@redhat.com>,
	Borislav Petkov <bp@alien8.de>, H Peter Anvin <hpa@zytor.com>,
	David Woodhouse <dwmw2@infradead.org>,
	Lu Baolu <baolu.lu@linux.intel.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Tony Luck <tony.luck@intel.com>, Ashok Raj <ashok.raj@intel.com>,
	Jacob Jun Pan <jacob.jun.pan@intel.com>,
	Dave Jiang <dave.jiang@intel.com>,
	Sohil Mehta <sohil.mehta@intel.com>,
	Ravi V Shankar <ravi.v.shankar@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>,
	iommu@lists.linux-foundation.org, x86 <x86@kernel.org>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/7] x86/cpufeatures: Enumerate ENQCMD and ENQCMDS instructions
Date: Sun, 26 Apr 2020 13:06:33 +0200	[thread overview]
Message-ID: <87y2qisdza.fsf@nanos.tec.linutronix.de> (raw)
In-Reply-To: <1585596788-193989-3-git-send-email-fenghua.yu@intel.com>

Fenghua Yu <fenghua.yu@intel.com> writes:
> A user space application can execute ENQCMD instruction to submit work
> to device. The kernel executes ENQCMDS instruction to submit work to
> device.

So a user space application _can_ execute ENQCMD and the kernel
executes ENQCMDS. And both submit work to device.

> There is a lot of other enabling needed for the instructions to actually
> be usable in user space and the kernel, and that enabling is coming later
> in the series and in device drivers.

That's important information to the enumeration of the instructions in
which way?

Thanks,

        tglx
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

  reply	other threads:[~2020-04-26 11:06 UTC|newest]

Thread overview: 74+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-30 19:33 [PATCH 0/7] x86: tag application address space for devices Fenghua Yu
2020-03-30 19:33 ` Fenghua Yu
2020-03-30 19:33 ` [PATCH 1/7] docs: x86: Add a documentation for ENQCMD Fenghua Yu
2020-03-30 19:33   ` Fenghua Yu
2020-04-26 11:02   ` Thomas Gleixner
2020-04-26 11:02     ` Thomas Gleixner
2020-04-27 20:13     ` Fenghua Yu
2020-04-27 20:13       ` Fenghua Yu
2020-03-30 19:33 ` [PATCH 2/7] x86/cpufeatures: Enumerate ENQCMD and ENQCMDS instructions Fenghua Yu
2020-03-30 19:33   ` Fenghua Yu
2020-04-26 11:06   ` Thomas Gleixner [this message]
2020-04-26 11:06     ` Thomas Gleixner
2020-04-27 20:17     ` Fenghua Yu
2020-04-27 20:17       ` Fenghua Yu
2020-03-30 19:33 ` [PATCH 3/7] x86/fpu/xstate: Add supervisor PASID state for ENQCMD feature Fenghua Yu
2020-03-30 19:33   ` Fenghua Yu
2020-04-26 11:17   ` Thomas Gleixner
2020-04-26 11:17     ` Thomas Gleixner
2020-04-27 20:33     ` Fenghua Yu
2020-04-27 20:33       ` Fenghua Yu
2020-03-30 19:33 ` [PATCH 4/7] x86/msr-index: Define IA32_PASID MSR Fenghua Yu
2020-03-30 19:33   ` Fenghua Yu
2020-04-26 11:22   ` Thomas Gleixner
2020-04-26 11:22     ` Thomas Gleixner
2020-04-27 20:50     ` Fenghua Yu
2020-04-27 20:50       ` Fenghua Yu
2020-03-30 19:33 ` [PATCH 5/7] x86/mmu: Allocate/free PASID Fenghua Yu
2020-03-30 19:33   ` Fenghua Yu
2020-04-26 14:55   ` Thomas Gleixner
2020-04-26 14:55     ` Thomas Gleixner
2020-04-27 22:18     ` Fenghua Yu
2020-04-27 22:18       ` Fenghua Yu
2020-04-27 23:44       ` Thomas Gleixner
2020-04-27 23:44         ` Thomas Gleixner
2020-04-28 18:21     ` Jacob Pan (Jun)
2020-04-28 18:21       ` Jacob Pan (Jun)
2020-04-28 18:54       ` Thomas Gleixner
2020-04-28 18:54         ` Thomas Gleixner
2020-04-28 19:07         ` Luck, Tony
2020-04-28 19:07           ` Luck, Tony
2020-04-28 20:42           ` Jacob Pan (Jun)
2020-04-28 20:42             ` Jacob Pan (Jun)
2020-04-28 20:59             ` Luck, Tony
2020-04-28 20:59               ` Luck, Tony
2020-04-28 22:13               ` Jacob Pan (Jun)
2020-04-28 22:13                 ` Jacob Pan (Jun)
2020-04-28 22:32                 ` Luck, Tony
2020-04-28 22:32                   ` Luck, Tony
2020-04-28 20:40         ` Jacob Pan (Jun)
2020-04-28 20:40           ` Jacob Pan (Jun)
2020-04-28 20:57     ` Fenghua Yu
2020-04-28 20:57       ` Fenghua Yu
2020-03-30 19:33 ` [PATCH 6/7] x86/traps: Fix up invalid PASID Fenghua Yu
2020-03-30 19:33   ` Fenghua Yu
2020-04-26 15:25   ` Thomas Gleixner
2020-04-26 15:25     ` Thomas Gleixner
2020-04-27 20:11     ` Fenghua Yu
2020-04-27 20:11       ` Fenghua Yu
2020-04-28  0:13       ` Thomas Gleixner
2020-04-28  0:13         ` Thomas Gleixner
2020-04-27 22:46     ` Raj, Ashok
2020-04-27 22:46       ` Raj, Ashok
2020-04-27 23:08       ` Luck, Tony
2020-04-27 23:08         ` Luck, Tony
2020-04-28  0:20         ` Thomas Gleixner
2020-04-28  0:20           ` Thomas Gleixner
2020-04-28  0:54       ` Thomas Gleixner
2020-04-28  0:54         ` Thomas Gleixner
2020-04-28  1:08         ` Raj, Ashok
2020-04-28  1:08           ` Raj, Ashok
2020-03-30 19:33 ` [PATCH 7/7] x86/process: Clear PASID state for a newly forked/cloned thread Fenghua Yu
2020-03-30 19:33   ` Fenghua Yu
2020-04-22 20:41 ` [PATCH 0/7] x86: tag application address space for devices Fenghua Yu
2020-04-22 20:41   ` Fenghua Yu

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