linux-kernel - RE: [PATCH v3 1/2] x86: Add support for the pcommit instruction

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Date:	Wed, 28 Jan 2015 17:10:46 +0000
From:	"Elliott, Robert (Server Storage)" <Elliott@...com>
To:	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	H Peter Anvin <h.peter.anvin@...el.com>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	"Kani, Toshimitsu" <toshi.kani@...com>,
	"Knippers, Linda" <linda.knippers@...com>
Subject: RE: [PATCH v3 1/2] x86: Add support for the pcommit instruction



> -----Original Message-----
> From: linux-kernel-owner@...r.kernel.org [mailto:linux-kernel-
> owner@...r.kernel.org] On Behalf Of Ross Zwisler
> Sent: Tuesday, 27 January, 2015 10:54 AM
> To: linux-kernel@...r.kernel.org
> Cc: Ross Zwisler; H Peter Anvin; Ingo Molnar; Thomas Gleixner; Borislav
> Petkov
> Subject: [PATCH v3 1/2] x86: Add support for the pcommit instruction
> 
> Add support for the new pcommit (persistent commit) instruction.  This
> instruction was announced in the document "Intel Architecture
> Instruction Set Extensions Programming Reference" with reference number
> 319433-022.
> 
> https://software.intel.com/sites/default/files/managed/0d/53/319433-
> 022.pdf
> 
...
> ---
>  arch/x86/include/asm/cpufeature.h    | 1 +
>  arch/x86/include/asm/special_insns.h | 8 ++++++++
>  2 files changed, 9 insertions(+)

Should this patch series also add defines for the virtual 
machine control data structure changes?

1. Add the new VM-Execution Controls bit 21 as
    SECONDARY_EXEC_PCOMMIT_EXITING 0x00200000
to arch/x86/include/asm/vmx.h.

2. Add the new exit reason of 64 (0x41) as
	EXIT_REASON_PCOMMIT  64
to arch/x86/include/uapi/asm/vmx.h and (with a
VMX_EXIT_REASONS string) to usr/include/asm/vmx.h.

3. Add a kvm_vmx_exit_handler to arch/x86/kvm/vmx.c.


---
Rob Elliott    HP Server Storage


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