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Re: [Xen-devel] guest state on realmode emulation failure
| To: | Jan Beulich <jbeulich@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] guest state on realmode emulation failure |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Mon, 17 Nov 2008 15:58:31 +0000 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Mon, 17 Nov 2008 07:59:03 -0800 |
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| Thread-topic: | [Xen-devel] guest state on realmode emulation failure |
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On 17/11/08 15:55, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote: >>> As a secondary thing, I can't really see how emulation of a real-mode far >>> return could ever fail with the register state given. >> >> Have you tested with xen-unstable changeset 18766? > > Not yet, but shouldn't that affect things only when 'mis-'using real mode > (e.g. by leaving a 32-bit default operand size set)? No, realmode_deliver_exception() was testing a potentially uninitialised field. It's a nasty little bug that thus occasionally, whether real mode is abused or not, causes you to write through ESP rather than SP. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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