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

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Date:	Mon, 4 Jan 2016 20:41:24 +0000
From:	Joao Martins <joao.m.martins@...cle.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>
Cc:	linux-kernel@...r.kernel.org, xen-devel@...ts.xen.org,
	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 04:15 PM, Boris Ostrovsky wrote:
> 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.
> 
OK, I will remove this patch then.

I only added it because even if PVCLOCK_TSC_STABLE_BIT is not supported it would
leave the pvti registered with Xen during domain lifetime [it seems we can't
unregister the pvti]. But perhaps this is not a concern.

> -boris
> 
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