linux-kernel - Re: [PATCH RFC 1/3] vmx: allow ioeventfd for EPT violations

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Message-ID: <20150831175300-mutt-send-email-mst@redhat.com>
Date:	Mon, 31 Aug 2015 17:57:05 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Xiao Guangrong <guangrong.xiao@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH RFC 1/3] vmx: allow ioeventfd for EPT violations

On Mon, Aug 31, 2015 at 09:23:13PM +0800, Xiao Guangrong wrote:
> I have another question, the eventfd memory is never read by guest and it's always
> a write MMIO VM-exit, why you build it on RO memslot? Why not just use normal MMIO page
> instead?

We do that at the moment, that's slower than PIO.

-- 
MST
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