On 12/27/2010 04:58 PM, Gleb Natapov wrote:
On Mon, Dec 27, 2010 at 04:55:08PM +0200, Avi Kivity wrote: > On 12/27/2010 04:37 PM, Gleb Natapov wrote: > >> What's the scenario here? And what segment is involved? if it's fs > >> or gs, or maybe ss, I can see it working out, but hardly otherwise. > >> > >The scenario is older Seabios that lefts DS segment unaligned during > >switch to real mode in int1587 function (copy extended memory). > > > > Did it not use %ds then? > It restores %ds before first use. There can be other guests of course that try to use %ds in protected mode. We can distinguish one from the other.
Okay. Please add a printk_once() if we lose some bits here, so we know something bad happened.
In theory we should do this for the other cases too, but they have been there long enough.
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