Hi Michal, I can't now give a way to reproduce the bug but I'll send an executable if I manage to reproduce the problem on something minimalist.
But I can give you the context of the problem: Host OS: Debian jessie 64-bits Guest OS: Debian jessie 32-bits Processor: i7-2600 (and all i7 tested) PS: Sorry for the previous mail that was accidently sent Regards, 2016-05-12 12:18 GMT+02:00 quentin buathier <qbuath...@tetrane.com>: > Hi Michal, > > I can't now give a way to reproduce the bug. I'll send an executable if I > manage to reproduce the problem on something minimalist. > > But I can give you the context of the problem: > Host OS: Debian jessie 64-bits > > > 2016-05-12 11:52 GMT+02:00 Michal Necasek <michal.neca...@oracle.com>: > >> >> Hi Quentin, >> >> Thank you for the patch! >> >> Unfortunately (?) I can't reproduce the problem that was originally >> fixed. Could you please provide a bit more information? What's the host OS, >> guest OS, host CPU type? How to reproduce the problem? >> >> Regards, >> Michal >> >> >> On 5/12/2016 11:26 AM, quentin buathier wrote: >> >>> Hi, >>> >>> As I understand it, there used to be a problem with restoring the FPU >>> segments in case of a 64-bit hosts with a 32-bit guest. This issue has >>> been fixed by using the macros "SAVE_32_OR_64_FPU" and >>> "RESTORE_32_OR_64_FPU" in "src/VBox/VMM/VMMR0/CPUMR0A.asm" (when >>> Virtualbox was using fxsave and fxrstor to save and restore the FPU >>> context). >>> >>> But along with the recent support of xsave / xrstor, the bug was >>> reintroduced: if the CPU supports xsave/xrstor, Virtualbox uses these >>> instructions and the guest's FPU segments are not restored properly. >>> >>> Please find attached a possible patch to fix this issue (MIT licence). >>> >>> Regards, >>> >>> >>> _______________________________________________ >>> vbox-dev mailing list >>> vbox-dev@virtualbox.org >>> https://www.virtualbox.org/mailman/listinfo/vbox-dev >>> >>> >> _______________________________________________ >> vbox-dev mailing list >> vbox-dev@virtualbox.org >> https://www.virtualbox.org/mailman/listinfo/vbox-dev >> > >
_______________________________________________ vbox-dev mailing list vbox-dev@virtualbox.org https://www.virtualbox.org/mailman/listinfo/vbox-dev
