From: Roman Kagan <rkagan@virtuozzo.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: <linux-kernel@vger.kernel.org>, <kvm@vger.kernel.org>,
<peterhornyack@google.com>, <rkrcmar@redhat.com>,
<den@openvz.org>
Subject: Re: [PATCH 3/4] KVM: x86: introduce get_kvmclock_ns
Date: Fri, 2 Sep 2016 18:24:40 +0300 [thread overview]
Message-ID: <20160902152439.xraq7pmtryd2nkta@rkaganb.sw.ru> (raw)
In-Reply-To: <1472743575-123756-4-git-send-email-pbonzini@redhat.com>
On Thu, Sep 01, 2016 at 05:26:14PM +0200, Paolo Bonzini wrote:
> Introduce a function that reads the exact nanoseconds value that is
> provided to the guest in kvmclock. This crystallizes the notion of
> kvmclock as a thin veneer over a stable TSC, that the guest will
> (hopefully) convert with NTP. In other words, kvmclock is *not* a
> paravirtualized host-to-guest NTP.
It might also be worth documenting this approach in a comment somewhere
around pvclock_gtod_notify / update_pvclock_gtod or friends. And, if
those could be simplified due to this change, it would be great, too.
Roman.
next prev parent reply other threads:[~2016-09-02 15:40 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-01 15:26 [PATCH 0/4] KVM: x86: kvmclock cleanups for Hyper-V TSC page Paolo Bonzini
2016-09-01 15:26 ` [PATCH 1/4] KVM: x86: always fill in vcpu->arch.hv_clock Paolo Bonzini
2016-09-02 13:31 ` Roman Kagan
2016-09-02 13:48 ` Paolo Bonzini
2016-09-01 15:26 ` [PATCH 2/4] KVM: x86: initialize kvmclock_offset Paolo Bonzini
2016-09-02 13:32 ` Roman Kagan
2016-09-01 15:26 ` [PATCH 3/4] KVM: x86: introduce get_kvmclock_ns Paolo Bonzini
2016-09-02 13:52 ` Roman Kagan
2016-09-02 14:09 ` Paolo Bonzini
2016-09-02 14:51 ` Roman Kagan
2016-09-02 16:37 ` Paolo Bonzini
2016-09-02 16:55 ` Roman Kagan
2016-09-02 16:57 ` Paolo Bonzini
2016-09-02 17:07 ` Roman Kagan
2016-09-02 15:24 ` Roman Kagan [this message]
2016-09-05 13:59 ` Paolo Bonzini
2016-09-01 15:26 ` [PATCH 4/4] KVM: x86: Hyper-V tsc page setup Paolo Bonzini
2016-09-02 14:17 ` Roman Kagan
2016-09-19 11:39 [PATCH v2 0/4] KVM: x86: kvmclock cleanups for Hyper-V TSC page Paolo Bonzini
2016-09-19 11:39 ` [PATCH 3/4] KVM: x86: introduce get_kvmclock_ns Paolo Bonzini
2016-09-19 16:33 ` Roman Kagan
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