: add mechanism to let user
choose which counter to return
On 2020-05-24 03:11, Richard Cochran wrote:
> On Fri, May 22, 2020 at 04:37:23PM +0800, Jianyong Wu wrote:
>> In general, vm inside will use virtual counter compered with host use
>> phyical counter. But in some special scenari
...@intel.com;
> Mark Rutland ; w...@kernel.org; Suzuki Poulose
> ; Steven Price ; linux-
> ker...@vger.kernel.org; linux-arm-ker...@lists.infradead.org;
> kvm...@lists.cs.columbia.edu; k...@vger.kernel.org; Steve Capper
> ; Kaly Xin ; Justin He
> ; Wei Chen ; nd
> Subject: Re:
On 2020-05-24 03:11, Richard Cochran wrote:
On Fri, May 22, 2020 at 04:37:23PM +0800, Jianyong Wu wrote:
In general, vm inside will use virtual counter compered with host use
phyical counter. But in some special scenarios, like nested
virtualization, phyical counter maybe used by vm. A
er...@intel.com; Mark Rutland ;
> w...@kernel.org; Suzuki Poulose ; Steven Price
> ; linux-kernel@vger.kernel.org; linux-arm-
> ker...@lists.infradead.org; kvm...@lists.cs.columbia.edu;
> k...@vger.kernel.org; Steve Capper ; Kaly Xin
> ; Justin He ; Wei Chen
> ; nd
> Subject: Re:
On Mon, May 25, 2020 at 04:50:28AM +, Jianyong Wu wrote:
> How about adding an extra argument in struct ptp_clock_info to serve as a
> flag, then we can control this flag using IOCTL to determine the counter type.
no, No, NO!
> > From your description, this "flag" really should be a module
m...@kernel.org; Mark Rutland ; w...@kernel.org;
> Suzuki Poulose ; Steven Price
> ; linux-kernel@vger.kernel.org; linux-arm-
> ker...@lists.infradead.org; kvm...@lists.cs.columbia.edu;
> k...@vger.kernel.org; Steve Capper ; Kaly Xin
> ; Justin He ; Wei Chen
> ; nd
> Sub
On Fri, May 22, 2020 at 04:37:23PM +0800, Jianyong Wu wrote:
> In general, vm inside will use virtual counter compered with host use
> phyical counter. But in some special scenarios, like nested
> virtualization, phyical counter maybe used by vm. A interface added in
> ptp_kvm driver to offer a
On Fri, May 22, 2020 at 04:37:23PM +0800, Jianyong Wu wrote:
> To use this feature, you should call PTP_EXTTS_REQUEST(2) ioctl with flag
> set bit PTP_KVM_ARM_PHY_COUNTER in its argument then call
> PTP_SYS_OFFSET_PRECISE(2) ioctl to get the cross timestamp and phyical
> counter will return. If
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