From: Denis Plotnikov <dplotnikov@virtuozzo.com>
To: <pbonzini@redhat.com>, <rkrcmar@redhat.com>,
<mtosatti@redhat.com>, <kvm@vger.kernel.org>
Cc: <rkagan@virtuozzo.com>, <den@virtuozzo.com>, <dplotnikov@virtuozzo.com>
Subject: [PATCH v2 0/2] maintaining of kvm_clock stability on guest vCPU hotplug
Date: Fri, 7 Apr 2017 12:06:45 +0300 [thread overview]
Message-ID: <1491556007-56332-1-git-send-email-dplotnikov@virtuozzo.com> (raw)
new in v2:
- fix possible wraparound on the synchronization detection
- lines exceeding 80 chars are re-formatted
- excess parentheses are removed
======================
It was found, that after adding a new vCPU to a running VM (CPU hotplug)
kvm_clock lost the stability property in case of using it. This happened
because KVM didn't treated cpu hotplug as a special case of TSC
synchronization.
This patch series adds cpu hotplug to the TSC synchronization cases.
Denis Plotnikov (2):
KVM: x86: remaster kvm_write_tsc code
KVM: x86: fix maintaining of kvm_clock stability on guest CPU hotplug
arch/x86/kvm/x86.c | 61 ++++++++++++++++++++----------------------------------
1 file changed, 22 insertions(+), 39 deletions(-)
--
1.8.3.1
next reply other threads:[~2017-04-07 9:07 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-07 9:06 Denis Plotnikov [this message]
2017-04-07 9:06 ` [PATCH 1/2] KVM: x86: remaster kvm_write_tsc code Denis Plotnikov
2017-04-07 9:06 ` [PATCH 2/2] KVM: x86: fix maintaining of kvm_clock stability on guest CPU hotplug Denis Plotnikov
2017-04-07 9:09 [PATCH v2 0/2] maintaining of kvm_clock stability on guest vCPU hotplug Denis Plotnikov
2017-04-12 19:02 ` Radim Krčmář
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