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

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Date: Wed, 7 Feb 2024 06:44:25 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Eric Auger <eauger@...hat.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 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.