From: "Jan Beulich" <JBeulich@suse.com>
To: Paul Durrant <Paul.Durrant@citrix.com>
Cc: Ian Jackson <Ian.Jackson@citrix.com>,
"Keir (Xen.org)" <keir@xen.org>,
Stefano Stabellini <Stefano.Stabellini@citrix.com>,
Ian Campbell <Ian.Campbell@citrix.com>,
"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: [PATCH v2 3/3] x86/viridian: Add partition time reference counter MSR support
Date: Mon, 04 Aug 2014 16:15:57 +0100 [thread overview]
Message-ID: <53DFBFCD020000780002920D@mail.emea.novell.com> (raw)
In-Reply-To: <9AAE0902D5BC7E449B7C8E4E778ABCD03FFC91@AMSPEX01CL01.citrite.net>
>>> On 04.08.14 at 17:11, <Paul.Durrant@citrix.com> wrote:
>> From: Paul Durrant
>> I think that hvm_get_guest_time() should have the right semantics after all,
>> in that it appears to be ns since a vcpu was onlined and is preserved across
>> save/restore.
>
> Actually, I'm no longer convinced about that second part. It looks like only
> TSC is preserved across save/restore.
Indeed the saving/restoring would need to be written, similar to what
is done for the other virtual time sources. And just like for those other
system wide time sources, you'd have to pick a reference vCPU.
Jan
next prev parent reply other threads:[~2014-08-04 15:15 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-04 13:12 [PATCH v2 0/3] x86/viridian improvements Paul Durrant
2014-08-04 13:12 ` [PATCH v2 1/3] x86/viridian: Re-purpose the HVM parameter to be a feature mask Paul Durrant
2014-08-04 13:31 ` Andrew Cooper
2014-08-04 13:50 ` Jan Beulich
2014-08-04 14:50 ` Andrew Cooper
2014-08-04 15:13 ` Jan Beulich
2014-08-04 17:19 ` Paul Durrant
2014-08-04 13:45 ` Jan Beulich
2014-08-04 13:12 ` [PATCH v2 2/3] x86/viridian: Note that logging is under control of the guest Paul Durrant
2014-08-04 13:38 ` Andrew Cooper
2014-08-04 13:45 ` Paul Durrant
2014-08-04 13:12 ` [PATCH v2 3/3] x86/viridian: Add partition time reference counter MSR support Paul Durrant
2014-08-04 14:01 ` Jan Beulich
2014-08-04 14:12 ` Paul Durrant
2014-08-04 14:47 ` Paul Durrant
2014-08-04 15:11 ` Paul Durrant
2014-08-04 15:15 ` Jan Beulich [this message]
2014-08-04 15:23 ` Paul Durrant
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