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

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Message-ID: <alpine.DEB.2.02.1511121634040.526@kaball.uk.xensource.com>
Date:	Thu, 12 Nov 2015 16:34:36 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
CC:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	<xen-devel@...ts.xensource.com>,
	<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 Thu, 12 Nov 2015, Boris Ostrovsky wrote:
> 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).

I can do that, but it should be a separate patch. I'll queue it at the
end of the series.


> 
> >     	(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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