linux-kernel - Re: [PATCH v3 3/6] xen: introduce XENPF

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Date:	Thu, 12 Nov 2015 10:30:23 -0500
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	xen-devel@...ts.xensource.com
Cc:	linux-arm-kernel@...ts.infradead.org, Ian.Campbell@...rix.com,
	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	konrad.wilk@...cle.com, david.vrabel@...rix.com
Subject: Re: [PATCH v3 3/6] xen: introduce XENPF_settime64

On 11/11/2015 11:51 AM, Stefano Stabellini wrote:
> Rename the current XENPF_settime hypercall and related struct to
> XENPF_settime32.
>
> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> Acked-by: Arnd Bergmann <arnd@...db.de>
> CC: konrad.wilk@...cle.com
> CC: david.vrabel@...rix.com
> CC: boris.ostrovsky@...cle.com
> ---
>   arch/x86/xen/time.c              |    8 ++++----
>   include/xen/interface/platform.h |   18 ++++++++++++++----
>   2 files changed, 18 insertions(+), 8 deletions(-)
>
> diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
> index 663c2ea..3bbd377 100644
> --- a/arch/x86/xen/time.c
> +++ b/arch/x86/xen/time.c
> @@ -134,10 +134,10 @@ static int xen_pvclock_gtod_notify(struct notifier_block *nb,
>   	if (!was_set && timespec_compare(&now, &next_sync) < 0)
>   		return NOTIFY_OK;
>   
> -	op.cmd = XENPF_settime;
> -	op.u.settime.secs = now.tv_sec;
> -	op.u.settime.nsecs = now.tv_nsec;
> -	op.u.settime.system_time = xen_clocksource_read();
> +	op.cmd = XENPF_settime32;
> +	op.u.settime32.secs = now.tv_sec;
> +	op.u.settime32.nsecs = now.tv_nsec;
> +	op.u.settime32.system_time = xen_clocksource_read();

Can/should we switch to time64 here? (This would require a couple more 
changes but they would all be local to this routine).

-boris


>   
>   	(void)HYPERVISOR_platform_op(&op);
>   
> diff --git a/include/xen/interface/platform.h b/include/xen/interface/platform.h
> index 8e03587..732efb0 100644
> --- a/include/xen/interface/platform.h
> +++ b/include/xen/interface/platform.h
> @@ -35,14 +35,23 @@
>    * Set clock such that it would read <secs,nsecs> after 00:00:00 UTC,
>    * 1 January, 1970 if the current system time was <system_time>.
>    */
> -#define XENPF_settime             17
> -struct xenpf_settime {
> +#define XENPF_settime32             17
> +struct xenpf_settime32 {
>   	/* IN variables. */
>   	uint32_t secs;
>   	uint32_t nsecs;
>   	uint64_t system_time;
>   };
> -DEFINE_GUEST_HANDLE_STRUCT(xenpf_settime_t);
> +DEFINE_GUEST_HANDLE_STRUCT(xenpf_settime32_t);
> +#define XENPF_settime64           62
> +struct xenpf_settime64 {
> +    /* IN variables. */
> +    uint64_t secs;
> +    uint32_t nsecs;
> +    uint32_t mbz;
> +    uint64_t system_time;
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xenpf_settime64_t);
>   
>   /*
>    * Request memory range (@mfn, @mfn+@...mfns-1) to have type @type.
> @@ -495,7 +504,8 @@ struct xen_platform_op {
>   	uint32_t cmd;
>   	uint32_t interface_version; /* XENPF_INTERFACE_VERSION */
>   	union {
> -		struct xenpf_settime           settime;
> +		struct xenpf_settime32         settime32;
> +		struct xenpf_settime64         settime64;
>   		struct xenpf_add_memtype       add_memtype;
>   		struct xenpf_del_memtype       del_memtype;
>   		struct xenpf_read_memtype      read_memtype;

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