linux-kernel - Re: [PATCH 0/3] KVM: Fix lost IRQ acks for RTC

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Date:	Tue, 1 Mar 2016 16:28:52 -0800
From:	Steve Rutherford <srutherford@...gle.com>
To:	Joerg Roedel <joro@...tes.org>
Cc:	Paolo Bonzini <pbonzini@...hat.com>,
	Gleb Natapov <gleb@...nel.org>, KVM list <kvm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] KVM: Fix lost IRQ acks for RTC

This issue seems generic to level triggered interrupts as well as RTC
interrupts. It looks like KVM hacks around the issue with level
triggered interrupts by clearing the remote IRR when an IRQ is
reconfigured. Seems like an (admittedly lossy) way to handle this
issue with the RTC-IRQ would be to follow the lead of level-triggered
interrupts, and clear the pending EOIs when reconfiguring the RTC-IRQ.

[Given that we are already talking about this, this could be viewed as
a good time to go back and fix the issues with the remote IRR in the
IOAPIC.]

On Mon, Feb 29, 2016 at 7:30 AM, Joerg Roedel <joro@...tes.org> wrote:
> On Mon, Feb 29, 2016 at 04:12:42PM +0100, Paolo Bonzini wrote:
>> > This information is then used to match EOI signals from the
>> > guest to the RTC. This explicit back-tracking fixes the
>> > issue.
>>
>> Nice patches, really.  Ok to wait until 4.6?
>
> Thanks. Putting them into v4.6 is fine for me.
>
>
>         Joerg
>
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