Messages in this thread | | | Date | Tue, 28 Jul 2015 13:10:41 -0400 | From | Boris Ostrovsky <> | Subject | Re: [Xen-devel] [PATCH v4 0/3] x86: modify_ldt improvement, test, and config option |
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On 07/28/2015 01:07 PM, Andy Lutomirski wrote: > On Tue, Jul 28, 2015 at 9:30 AM, Andrew Cooper > <andrew.cooper3@citrix.com> wrote: >> I suspect that the set_ldt(NULL, 0) call hasn't reached Xen before >> xen_free_ldt() is attempting to nab back the pages which Xen still has >> mapped as an LDT. >> > I just instrumented it with yet more LSL instructions. I'm pretty > sure that set_ldt really is clearing at least LDT entry zero. > Nonetheless the free_ldt call still oopses. >
Yes, I added some instrumentation to the hypervisor and we definitely set LDT to NULL before failing.
-boris
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