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From: Peter Zijlstra <peterz@infradead.org>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>, kvm list <kvm@vger.kernel.org>
Subject: Re: Non-exiting rdpmc on KVM guests?
Date: Tue, 21 Apr 2015 22:51:39 +0200	[thread overview]
Message-ID: <20150421205139.GA2898@worktop.Skamania.guest> (raw)
In-Reply-To: <55367BB6.3050103@redhat.com>

On Tue, Apr 21, 2015 at 06:32:54PM +0200, Paolo Bonzini wrote:

> However, if you take into account that RDPMC can also be used
> to read an inactive counter, and that multiple guests "fight" for the
> same host counters, it's even harder to ensure that the guest counter
> indices match those on the host.

That doesn't make sense, only a single vcpu task will ever run at any
one time.

There cannot be inter guest counter contention.  Only the host can
compete for the same resources.

  reply	other threads:[~2015-04-21 20:51 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-21  0:47 Non-exiting rdpmc on KVM guests? Andy Lutomirski
2015-04-21 15:05 ` Peter Zijlstra
2015-04-21 16:32   ` Paolo Bonzini
2015-04-21 20:51     ` Peter Zijlstra [this message]
2015-04-21 21:10       ` Andy Lutomirski
2015-04-22 15:26         ` Peter Zijlstra
2015-04-22 21:05       ` Paolo Bonzini

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