From: "Radim Krčmář" <rkrcmar@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: kvm-devel <kvm@vger.kernel.org>, Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: KVM: x86: workaround SuSE's 2.6.16 pvclock vs masterclock issue
Date: Wed, 21 Jan 2015 15:09:27 +0100 [thread overview]
Message-ID: <20150121140926.GA9085@potion.brq.redhat.com> (raw)
In-Reply-To: <20150120175452.GA32680@amt.cnet>
2015-01-20 15:54-0200, Marcelo Tosatti:
> SuSE's 2.6.16 kernel fails to boot if the delta between tsc_timestamp
> and rdtsc is larger than a given threshold:
[...]
> Disable masterclock support (which increases said delta) in case the
> boot vcpu does not use MSR_KVM_SYSTEM_TIME_NEW.
Why do we care about 2.6.16 bugs in upstream KVM?
The code to benefit tradeoff of this patch seems bad to me ...
MSR_KVM_SYSTEM_TIME is deprecated -- we could remove it now, with
MSR_KVM_WALL_CLOCK (after hiding KVM_FEATURE_CLOCKSOURCE) if we want
to support old guests.
next prev parent reply other threads:[~2015-01-21 14:09 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-20 17:54 KVM: x86: workaround SuSE's 2.6.16 pvclock vs masterclock issue Marcelo Tosatti
2015-01-20 19:40 ` Paolo Bonzini
2015-01-21 14:09 ` Radim Krčmář [this message]
2015-01-21 14:16 ` Marcelo Tosatti
2015-01-21 17:00 ` Radim Krčmář
2015-01-22 1:40 ` Marcelo Tosatti
2015-01-22 13:59 ` Radim Krčmář
2015-01-22 18:12 ` Marcelo Tosatti
2015-01-22 19:33 ` Radim Krčmář
2015-01-22 8:10 ` Paolo Bonzini
2015-01-22 17:02 ` Radim Krčmář
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