From: Steve Rutherford <srutherford@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Zhang, Yang Z" <yang.z.zhang@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"srutherford@intel.com" <srutherford@intel.com>,
"Gudimetla, Giridhar Kumar" <giridhar.kumar.gudimetla@intel.com>,
"Nakajima, Jun" <jun.nakajima@intel.com>
Subject: Re: [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted
Date: Wed, 2 Sep 2015 15:38:21 -0700 [thread overview]
Message-ID: <20150902223821.GA1464@google.com> (raw)
In-Reply-To: <55CC47E4.5090200@redhat.com>
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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next prev parent reply other threads:[~2015-09-02 22:38 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-29 13:37 [PATCH 0/2] KVM: x86: limit interactions between IOAPIC and LAPIC Paolo Bonzini
2015-07-29 13:37 ` [PATCH 1/2] KVM: x86: set TMR when the interrupt is accepted Paolo Bonzini
2015-07-30 3:39 ` Steve Rutherford
2015-07-30 23:26 ` Zhang, Yang Z
2015-07-31 2:49 ` Steve Rutherford
2015-07-31 7:57 ` Paolo Bonzini
2015-08-03 2:44 ` Zhang, Yang Z
2015-07-31 8:01 ` Paolo Bonzini
2015-08-03 2:37 ` Zhang, Yang Z
2015-08-03 8:10 ` Paolo Bonzini
2015-08-03 10:23 ` Zhang, Yang Z
2015-08-03 10:55 ` Paolo Bonzini
2015-08-04 0:46 ` Zhang, Yang Z
2015-08-04 6:59 ` Paolo Bonzini
2015-08-04 7:21 ` Zhang, Yang Z
2015-08-13 6:35 ` Zhang, Yang Z
2015-08-13 7:31 ` Paolo Bonzini
2015-09-02 22:38 ` Steve Rutherford [this message]
2015-09-03 5:18 ` Nakajima, Jun
2015-09-03 7:38 ` Paolo Bonzini
2015-07-29 13:37 ` [PATCH 2/2] KVM: x86: store IOAPIC-handled vectors in each VCPU Paolo Bonzini
2015-07-30 3:55 ` Steve Rutherford
2015-07-30 7:19 ` Paolo Bonzini
2015-07-29 20:00 ` [PATCH 0/2] KVM: x86: limit interactions between IOAPIC and LAPIC Alex Williamson
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