From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH v13 0/8] pv event interface between host
	and guest
Date: Mon, 04 Mar 2013 13:21:10 +0100
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Cc: Peter Maydell <peter.maydell@linaro.org>, kvm list <kvm@vger.kernel.org>,
	"Michael S. Tsirkin" <mst@redhat.com>, Hu Tao <hutao@cn.fujitsu.com>,
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	Marcelo Tosatti <mtosatti@redhat.com>,
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To: Gleb Natapov <gleb@redhat.com>
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Il 04/03/2013 12:52, Gleb Natapov ha scritto:
> > Same here, you can remove the panic event port and add debugcon at
> > 0x505.  That's the problematic case.  But if the user goes to that
> > length, I think we can honestly say we don't care.
>
> IMO there is a big difference between well know serial ISA ports and
> PIO ports we allocate for our devices. Later have to be discoverable
> without resorting to probing. On CPU level we do the same with CPUID
> bits instead of relaying on MSRs #GP. On KVM API level we do the same
> with capabilities instead of relying on ioctls returning errors. This
> is not different.

Ok, I see your point now.  Yes, this is a good reason why patching is
better in the long run.

Paolo