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Re: [Xen-devel] [PATCH] disable writable pagetables on FreeBSD
| To: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] disable writable pagetables on FreeBSD |
| From: | Kip Macy <kip.macy@xxxxxxxxx> |
| Date: | Sat, 30 Apr 2005 08:12:46 -0700 |
| Cc: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Sat, 30 Apr 2005 15:12:27 +0000 |
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| Reply-to: | Kip Macy <kip.macy@xxxxxxxxx> |
| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
On 4/30/05, Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> wrote:
>
> On 30 Apr 2005, at 03:30, Kip Macy wrote:
>
> > Presumably as a result of recent changes, FreeBSD no longer works with
> > writable page tables. In the short-term I'm more interested in
> > functionality than performance. This patch disables them and fixes a
> > compile issue.
>
> The obvious change is we reenabled batched wrpt mode. This requires the
> guest to deal with reading page directory entries that have the present
> bit (bit 0) cleared, even though that entry is logically present. :-)
>
> You may hav eforgotten to handle this, since it was not required all
> the while we were using emulation mode only.
Entirely possible. There is only one place in the machine-independent
code where we check for it. Removing it there doesn't help. It may
require changing the machine-dependent code (I hope not, I'd rather it
be a bug in my port or in xen).
-Kip
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