Re: [PATCH/RFC 2/2] s390 virtualization interface.

[Anthony Liguori <aliguori-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>]

Can you provide a high-level description of how this virtualization 
mechanism works?  How does MMU virtualization work?

Carsten Otte wrote:
> +
> +#ifndef _ASM_S390_SIE64_H
> +#define _ASM_S390_SIE64_H
> +
> +struct sie_block {
> +	atomic_t cpuflags;	/* 0x0000 */
> +	__u32	prefix;		/* 0x0004 */
> +	__u32	:32;		/* 0x0008 */
> +	__u32	:32;		/* 0x000c */
> +	__u64	:64;		/* 0x0010 */
> +	__u64	:64;		/* 0x0018 */
> +	__u64	:64;		/* 0x0020 */
> +	__u64	cputm;		/* 0x0028 */
> +	__u64	ckc;		/* 0x0030 */
> +	__u64	epoch;		/* 0x0038 */
> +	__u8	svcnn	:1,	/* 0x0040 */
> +		svc1c	:1,
> +		svc2c	:1,
> +		svc3c	:1,
> +		:4;
>   

I think bitfields can have weird padding issues.

Regards,

Anthony Liguori

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