linux-kernel - Re: [PATCH 201/208] x86/fpu: Clean up xstate feature reservation

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Date:	Tue, 05 May 2015 13:12:54 -0700
From:	Dave Hansen <dave.hansen@...ux.intel.com>
To:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
CC:	Andy Lutomirski <luto@...capital.net>,
	Borislav Petkov <bp@...en8.de>,
	Fenghua Yu <fenghua.yu@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 201/208] x86/fpu: Clean up xstate feature reservation

On 05/05/2015 10:58 AM, Ingo Molnar wrote:
>  struct xregs_state {
>  	struct fxregs_state		i387;
>  	struct xstate_header		header;
> -	struct ymmh_struct		ymmh;
> -	struct lwp_struct		lwp;
> -	struct bndreg			bndreg[4];
> -	struct bndcsr			bndcsr;
> -	/* New processor state extensions will go here. */
> +	u8				__reserved[XSTATE_RESERVE];
>  } __attribute__ ((packed, aligned (64)));

Just to reiterate.  The size of 'XSTATE_RESERVE' is completely unknown
at compile time.  It's wrong in the existing kernel, but we should fix
it up instead of mucking with it like this.
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