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xen-devel
RE: [Xen-devel] Re: Reproducable data corruption on xen-unstable
A few minutes ago, I wrote:
So, it looks like we are looking for a code path in which TS doesn't end
up set after a task switch.
Aha! Shouldn't the stts macro in xeno-linux be calling
__HYPERVISOR_fpu_taskswitch instead of trying to write to CR0 itself?
Writing to CR0 directly is impossible in ring 1, isn't it?
I think I may have solved the mystery! I'll have to try that out in the
next few days.
stts is called by _mmx_memcpy, which is called by memcpy on Athlons. That
_might_ explain why people who aren't using Athlons haven't seen this.
--
Robin
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