linux-kernel - Re: [PATCH 1/4] x86-64: Allow emulated vsyscalls from user addresses

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Date:	Tue, 09 Aug 2011 13:59:20 -0500
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@....edu>
CC:	x86@...nel.org, Andi Kleen <andi@...stfloor.org>,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	lueckintel@...oo.com, kimwooyoung@...il.com,
	Ingo Molnar <mingo@...e.hu>, Borislav Petkov <bp@...en8.de>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: [PATCH 1/4] x86-64: Allow emulated vsyscalls from user addresses

On 08/09/2011 09:27 AM, Andy Lutomirski wrote:
>   *
>   *  Vectors   0 ...  31 : system traps and exceptions - hardcoded events
> - *  Vectors  32 ... 127 : device interrupts
> - *  Vector  128         : legacy int80 syscall interface
> - *  Vector  204         : legacy x86_64 vsyscall emulation
> - *  Vectors 129 ... INVALIDATE_TLB_VECTOR_START-1 except 204 : device interrupts
> + *  Vectors  32 ... INVALIDATE_TLB_VECTOR_START-1 : device interrupts, except:
> + *   Vectors 64 ... 66  : legacy x86_64 vsyscall emulation
> + *   Vector  128        : legacy int80 syscall interface
>   *  Vectors INVALIDATE_TLB_VECTOR_START ... 255 : special interrupts
>   *

Hi Andy,

Was there a reason to not use the vectors in the 0x2X range?

	-hpa

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