linux-kernel - Re: [PATCH] KVM/x86: Do not clear SIPI while in SMM

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Date: Fri, 19 Apr 2024 12:17:01 -0400
From: boris.ostrovsky@...cle.com
To: Igor Mammedov <imammedo@...hat.com>
Cc: Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM/x86: Do not clear SIPI while in SMM

On 4/17/24 9:58 AM, boris.ostrovsky@...cle.com wrote:
> 
> I noticed that I was using a few months old qemu bits and now I am 
> having trouble reproducing this on latest bits. Let me see if I can get 
> this to fail with latest first and then try to trace why the processor 
> is in this unexpected state.

Looks like 012b170173bc "system/qdev-monitor: move drain_call_rcu call 
under if (!dev) in qmp_device_add()" is what makes the test to stop failing.

I need to understand whether lack of failures is a side effect of timing 
changes that simply make hotplug fail less likely or if this is an 
actual (but seemingly unintentional) fix.

-boris