Re: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted

From	Steve Rutherford <srutherford@google.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted
Date	2015-09-03 00:40 +0200
Message-ID	<q4oRb-1HC-3@gated-at.bofh.it> (permalink)
References	(5 earlier) <pTlDk-NT-1@gated-at.bofh.it> <pTyAy-2Qy-5@gated-at.bofh.it> <pTEwh-3hI-15@gated-at.bofh.it> <pWUlc-3IA-29@gated-at.bofh.it> <pWVhg-53B-29@gated-at.bofh.it>
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On Thu, Aug 13, 2015 at 09:31:48AM +0200, Paolo Bonzini wrote:
Pinging this thread.

Should I put together a patch to make split irqchip work properly with the old TMR behavior?

> 
> 
> On 13/08/2015 08:35, Zhang, Yang Z wrote:
> >> You may be right. It is safe if no future hardware plans to use
> >> it. Let me check with our hardware team to see whether it will be
> >> used or not in future.
> > 
> > After checking with Jun, there is no guarantee that the guest running
> > on another CPU will operate properly if hypervisor modify the vTMR
> > from another CPU. So the hypervisor should not to do it.
> 
> I guess I can cause a vmexit on level-triggered interrupts, it's not a
> big deal, but no weasel words, please.
> 
> What's going to break, and where is it documented?
> 
> Paolo
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Re: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted Steve Rutherford <srutherford@google.com> - 2015-09-03 00:40 +0200
  Re: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted "Nakajima, Jun" <jun.nakajima@intel.com> - 2015-09-03 07:20 +0200
    Re: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted Paolo Bonzini <pbonzini@redhat.com> - 2015-09-03 09:40 +0200

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