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[Xen-devel] question on share ept page table with vtd

To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
From: "Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>
Date: Sat, 1 Feb 2014 00:29:41 +0000
Accept-language: en-US
Cc: "Tim Deegan \(tim@xxxxxxx\)" <tim@xxxxxxx>, "Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>, "'Jan Beulich \(JBeulich@xxxxxxxx\)'" <JBeulich@xxxxxxxx>
Delivery-date: Sat, 01 Feb 2014 00:30:22 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>
Thread-index: Ac8e5CKYvrz5ERWsQCyzfE/CC11Egw==
Thread-topic: question on share ept page table with vtd

Hi all

I have a question with the page table share between EPT and VTD which is 
enabled by default. Currently, we will enable log_dirty mode to track vram. And 
when first enable the log dirty mode, it will set all guest ram to readonly in 
EPT entry. The question is that if a page is current used as DMA write buffer, 
isn't it a problem?

best regards
yang


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