From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: Oops for sale
Date: Mon, 09 Jun 2008 18:54:01 +0200
Message-ID: <484D6029.1020209@redhat.com>
References: <48494341.1060007@redhat.com> <4849A2B7.1030305@qumranet.com> <484D3310.6070908@redhat.com> <484D5B4F.3080300@qumranet.com>
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Cc: kvm@vger.kernel.org
To: Avi Kivity <avi@qumranet.com>
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Avi Kivity wrote:
> The unshadow-on-userspace-access heuristic is broken.  Since it is also
> bad for Xenner, try removing the following lines:
> 
>        spte |= PT_WRITABLE_MASK;

Well, that line should better not be removed.  I get a hang otherwise,
guess due to running into a page-fault loop ...

>        if (user_fault) {
>            mmu_unshadow(vcpu->kvm, gfn);
>            goto unshadowed;
>        }

Deactivating those four lines fixed it.

thanks,
  Gerd

-- 
http://kraxel.fedorapeople.org/xenner/