linux-kernel - Re: [PATCH v8 02/33] x86/fred: make unions for the cs and ss fields in struct pt

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Date:   Mon, 05 Jun 2023 14:07:48 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Xin Li <xin3.li@...el.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, kvm@...r.kernel.org
Cc:     mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, peterz@...radead.org, andrew.cooper3@...rix.com,
        seanjc@...gle.com, pbonzini@...hat.com, ravi.v.shankar@...el.com,
        jiangshanlai@...il.com, shan.kang@...el.com
Subject: Re: [PATCH v8 02/33] x86/fred: make unions for the cs and ss fields
 in struct pt_regs

On Mon, Apr 10 2023 at 01:14, Xin Li wrote:
> +	union {
> +		unsigned long  csx;	/* cs extended: CS + any fields above it */
> +		struct __attribute__((__packed__)) {
> +			unsigned short cs;	/* CS selector proper */
> +			unsigned int current_stack_level: 2;
> +			unsigned int __csx_resv1	: 6;
> +			unsigned int interrupt_shadowed	: 1;
> +			unsigned int software_initiated	: 1;
> +			unsigned int __csx_resv2	: 2;
> +			unsigned int nmi		: 1;
> +			unsigned int __csx_resv3	: 3;
> +			unsigned int __csx_resv4	: 32;
> +		};
> +	};
>  	unsigned long flags;
>  	unsigned long sp;
> -	unsigned long ss;
> +	union {
> +		unsigned long  ssx;	/* ss extended: SS + any fields above it */
> +		struct __attribute__((__packed__)) {
> +			unsigned short ss;	/* SS selector proper */
> +			unsigned int __ssx_resv1	: 16;
> +			unsigned int vector		: 8;
> +			unsigned int __ssx_resv2	: 8;
> +			unsigned int type		: 4;
> +			unsigned int __ssx_resv3	: 4;
> +			unsigned int enclv		: 1;
> +			unsigned int long_mode		: 1;
> +			unsigned int nested		: 1;
> +			unsigned int __ssx_resv4	: 1;
> +			unsigned int instr_len		: 4;
> +		};
> +	};

This does not match section

    5.2.1 Saving Information on the Regular Stack?

of version 4 and later of the specification.

Thanks,

        tglx