[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] 64 bit Intel HVM Weirdness - setjmp\longjump fp exception in Xen, not on real hardware or AMD HVM
Well, what would you expect the changelog to say? It's fixed in the xen-3.4-testing.hg repository by changeset 19697, which is a backport of xen-unstable.hg:19953. -- Keir On 01/11/2009 19:32, "Allan Graves" <allan.graves@xxxxxxxxxx> wrote: > Keir - > > Hmm... according to /sys/hypervisor/version, I'm running 3.4.0. > > Is there a reasonable chance this is fixed in 3.4.1? I haven't seen > anything in the changelogs... > > > Allan > > > > Keir Fraser wrote: >> What version of Xen are you using? This bug may be fixed in Xen 3.3.2 and >> Xen 3.4.1. >> >> -- Keir >> >> On 30/10/2009 01:23, "Allan Graves" <allan.graves@xxxxxxxxxx> wrote: >> >> >>> (Please excuse double posting - I was told xen-users was not the right >>> list, to put it on xen-devel, as it was not a technical support query, >>> but an issue.) >>> >>> >>> The following program will crash with a fp exception on an INTEL 64 bit >>> HVM domU only: >>> #include <setjmp.h> >>> jmp_buf env; main() { if(setjmp(env)) return; longjmp(env, 1); } >>> >>> >>> This can be seen using both Linux and Windows 64 bit Guests. >>> >>> >>> My machine is a Core 2 Duo with both VT-D and VT-X extensions enabled. >>> Unfortunately, this is blocking our usage of 64 bit HVM Windows guests. >>> >>> A similar issue was reported in KVM and recently fixed, some of their >>> analysis is below: >>> -------------------------------------------------- >>> >>>>>> It seems that the problem can be reproduced by compiling the >>>>>> following simple program using cygwin's gcc. The program crashes on >>>>>> w2k3-amd64 on kvm-83 on core2-duo, and it does not crash on the >>>>>> same w2k3-amd64 installation on kvm-83 on AMD Phenom. >>>>>> >>>>>> #include <setjmp.h> >>>>>> >>>>>> jmp_buf env; main() { if(setjmp(env)) return; longjmp(env, 1); } >>>>>> >>>>>> The problem seems to be in the instruction ``mov gs,ax'' (Intel >>>>>> syntax) in the longjmp() code. If I let the virtual machine execute >>>>>> the instruction, the program crashes. However, if I step over the >>>>>> instruction using the vs2008 debugger, the program completes >>>>>> without crashing. Thus, I think that this is the instruction that >>>>>> Avi is looking for, but I don't know how to proceed from here. >>>>>> ------------------------------------------------------- >>>>>> >>> http://markmail.org/message/owy3x7pf6oywdx5e#query:+page:1+mid:spz6vmdothb2n >>> jf >>> b+state:results >>> >>> >>> >>> Anyone have a solution to this? :) >>> >>> Allan >>> >>> >>> >>> >>> >>> _______________________________________________ >>> Xen-devel mailing list >>> Xen-devel@xxxxxxxxxxxxxxxxxxx >>> http://lists.xensource.com/xen-devel >>> >> >> >> _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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