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Re: [Xen-devel] P2M Top Level Page Table

To: "Huang2, Wei" <Wei.Huang2@xxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>, Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] P2M Top Level Page Table
From: Keir Fraser <keir@xxxxxxxxxxxxx>
Date: Thu, 29 Mar 2007 18:39:41 +0100
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On 29/3/07 17:46, "Huang2, Wei" <Wei.Huang2@xxxxxxx> wrote:

My question is about h_cr3 in VMCB under hap mode. It points to the top level of P2M table, which might be located in memory space beyond 4GB. It can cause problem potentially.

Sounds like you’ll need to fix it then. =)

There are several ‘lowmem pae top-level caches’ tucked away in vcpu->arch, so you could reuse one of those. Or allocate/reallocate the P2M root using alloc_domheap_pages with a limited address mask, or use xmalloc.

 -- Keir
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