linux-kernel - Re: [PATCH] kvm: don't take vcpu mutex for obviously invalid vcpu ioctls

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Date:	Mon, 22 Sep 2014 21:13:08 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	David Matlack <dmatlack@...gle.com>
Cc:	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kvm: don't take vcpu mutex for obviously invalid vcpu
 ioctls

On Mon, Sep 22, 2014 at 03:58:16PM -0700, David Matlack wrote:
> > Should not be executing vcpu ioctls without interrupt KVM_RUN in the
> > first place.
> 
> This patch is trying to be nice to code that isn't aware it's
> probing kvm file descriptors. We saw long hangs with some generic
> process inspection code that was probing all open file descriptors.
> There's no reason non-kvm ioctls should have to wait for the vcpu
> mutex to become available just to fail.

OK then, please add the usecase to the changelog.

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