linux-kernel - Re: [PATCH] KVM: selftests: Fix a semaphore imbalance in the dirty ring logging test

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Message-ID: <86c33c28-77a8-46ed-9c5c-2ae0acbf5b3b@redhat.com>
Date: Wed, 7 Feb 2024 16:43:40 +0100
From: Eric Auger <eauger@...hat.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
 linux-kernel@...r.kernel.org, Shaoqin Huang <shahuang@...hat.com>
Subject: Re: [PATCH] KVM: selftests: Fix a semaphore imbalance in the dirty
 ring logging test



On 2/7/24 15:44, Sean Christopherson wrote:
> On Wed, Feb 07, 2024, Eric Auger wrote:
>> Hi Sean,
>>
>> On 2/6/24 22:36, Sean Christopherson wrote:
>>> On Fri, 02 Feb 2024 15:18:31 -0800, Sean Christopherson wrote:
>>>> When finishing the final iteration of dirty_log_test testcase, set
>>>> host_quit _before_ the final "continue" so that the vCPU worker doesn't
>>>> run an extra iteration, and delete the hack-a-fix of an extra "continue"
>>>> from the dirty ring testcase.  This fixes a bug where the extra post to
>>>> sem_vcpu_cont may not be consumed, which results in failures in subsequent
>>>> runs of the testcases.  The bug likely was missed during development as
>>>> x86 supports only a single "guest mode", i.e. there aren't any subsequent
>>>> testcases after the dirty ring test, because for_each_guest_mode() only
>>>> runs a single iteration.
>>>>
>>>> [...]
>>>
>>> Applied to kvm-x86 selftests, thanks!
>> Do you plan to send this branch to Paolo for v6.8?
> 
> That wasn't my initial plan, but looking at what's in there, the only thing that
> isn't a fix is Andrew's series to remove redundant newlines.  So yeah, I'll send
> this along for 6.8.
> 

OK. Many thanks!

Eric