linux-kernel - Re: [Xen-devel] [PATCH RFC 3/3] xen/Kconfig: add XEN_TIME

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Date:	Mon, 4 Jan 2016 11:15:04 -0500
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	David Vrabel <david.vrabel@...rix.com>,
	Joao Martins <joao.m.martins@...cle.com>,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xen.org
Cc:	x86@...nel.org, Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Xen-devel] [PATCH RFC 3/3] xen/Kconfig: add XEN_TIME_VSYSCALL
 option

On 01/04/2016 11:12 AM, David Vrabel wrote:
> On 28/12/15 21:52, Joao Martins wrote:
>> This option enables support for pvclock vsyscall/vdso
>> support on Xen. Default is off, since Xen doesn't
>> expose yet the PVCLOCK_TSC_STABLE_BIT flag.
> Do we need a Kconfig option for this?  I think this should always be
> enabled.
>
> The kernel support won't be merged until the hypervisor changes have
> been accepted.

I agree. xen_setup_vsyscall_time_info() will (harmlessly) fail if 
PVCLOCK_TSC_STABLE_BIT is not set.

-boris
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