Groups > linux.kernel > #1199478

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

From	"Zhang, Yang Z" <yang.z.zhang@intel.com>
Newsgroups	linux.kernel
Subject	RE: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted
Date	2015-08-04 09:30 +0200
Message-ID	<pTEPE-3ES-7@gated-at.bofh.it> (permalink)
References	(5 earlier) <pTj8u-5Oc-13@gated-at.bofh.it> <pTlah-fp-9@gated-at.bofh.it> <pTlDk-NT-1@gated-at.bofh.it> <pTyAy-2Qy-5@gated-at.bofh.it> <pTEwh-3hI-15@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Paolo Bonzini wrote on 2015-08-04:
> 
> 
> On 04/08/2015 02:46, Zhang, Yang Z wrote:
>>> It is a problem for split irqchip, where the EOI exit bitmap can be
>>> inferred from the IOAPIC routes but the TMR cannot.  The hardware
>>> behavior on the other hand can be implemented purely within the LAPIC.
>> 
>> So updating the TMR within LAPIC is the only solution to handle it?
> 
> It's the simplest and the one that makes most sense.  Considering that
> TMR is a pretty obscure feature, it's unlikely that it will be
> accelerated in the future.

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. 

> 
> Paolo


Best regards,
Yang


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Thread

[PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted Paolo Bonzini <pbonzini@redhat.com> - 2015-07-29 15:40 +0200
  Re: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted Steve Rutherford <srutherford@google.com> - 2015-07-30 05:40 +0200
  RE: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted "Zhang, Yang Z" <yang.z.zhang@intel.com> - 2015-08-03 04:40 +0200
    Re: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted Paolo Bonzini <pbonzini@redhat.com> - 2015-08-03 10:20 +0200
      RE: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted "Zhang, Yang Z" <yang.z.zhang@intel.com> - 2015-08-03 12:30 +0200
        Re: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted Paolo Bonzini <pbonzini@redhat.com> - 2015-08-03 13:00 +0200
          RE: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted "Zhang, Yang Z" <yang.z.zhang@intel.com> - 2015-08-04 02:50 +0200
            Re: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted Paolo Bonzini <pbonzini@redhat.com> - 2015-08-04 09:10 +0200
              RE: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted "Zhang, Yang Z" <yang.z.zhang@intel.com> - 2015-08-04 09:30 +0200
  RE: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted "Zhang, Yang Z" <yang.z.zhang@intel.com> - 2015-08-03 04:50 +0200

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