[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] fxsave, fnsave, ltr hang for guest OS.
On 19/11/2010 17:32, "alarson@xxxxxxxx" <alarson@xxxxxxxx> wrote: > Just to report final resolution. The problem turned out to be that > the destination of the fnsave was to a page specifying read only > access and the OS was depending on CR0.WP=0 to permit write access in > kernel mode. Xen doesn't allow this configuration unless using HAP > (Hardware Assisted Paging). To be precise, we have a go at emulating the instruction, but our emulator is incomplete. Running a whole OS in CR0.WP=0 mode is pretty much doomed if running on Xen without HAP. I think there is some supported OS that does do some small amount of stuff with CR0.WP=0, and we are complete enough to work in that case. -- Keir > Many thanks to Keir for his invaluable assistance with this. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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