From: Joao Martins <joao.m.martins@oracle.com>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>,
David Vrabel <david.vrabel@citrix.com>
Cc: linux-kernel@vger.kernel.org, xen-devel@lists.xen.org,
x86@kernel.org, Ingo Molnar <mingo@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [Xen-devel] [PATCH RFC 3/3] xen/Kconfig: add XEN_TIME_VSYSCALL option
Date: Mon, 4 Jan 2016 20:41:24 +0000 [thread overview]
Message-ID: <568AD8F4.3090203@oracle.com> (raw)
In-Reply-To: <568A9A88.8060702@oracle.com>
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
>
prev parent reply other threads:[~2016-01-04 20:41 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-28 21:52 [PATCH RFC 0/3] x86/xen: pvclock vdso support Joao Martins
2015-12-28 21:52 ` [PATCH RFC 1/3] x86/pvclock: add setter for pvclock_pvti_cpu0_va Joao Martins
2015-12-28 23:45 ` Andy Lutomirski
2015-12-29 12:50 ` Joao Martins
2015-12-29 13:03 ` Andy Lutomirski
2015-12-28 21:52 ` [PATCH RFC 2/3] x86/xen/time: setup vcpu 0 time info page Joao Martins
2016-01-04 16:07 ` Boris Ostrovsky
2016-01-04 20:41 ` Joao Martins
2016-01-04 21:34 ` Boris Ostrovsky
2016-01-05 12:20 ` Joao Martins
2015-12-28 21:52 ` [PATCH RFC 3/3] xen/Kconfig: add XEN_TIME_VSYSCALL option Joao Martins
2016-01-04 16:12 ` [Xen-devel] " David Vrabel
2016-01-04 16:15 ` Boris Ostrovsky
2016-01-04 20:41 ` Joao Martins [this message]
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