Andrea Arcangeli wrote: > Hello, > > there's a small glitch in the preempt notifier external module > emulation. The overloaded debug handler will not detect when a debug > exception has been generated by ptrace and it'll crash the host by > calling the preempt emulator like if this was a KVM preempt emulated > exception, instead of notifying userland. > > To detect when the preempt emulation is needed and when the exception > should be bypassed to the original handler, I decided to use bit 10 of > db7 that can't be set to 1 by ptrace, the mask against the userland > passed db7 value is 0xfc00, so bit 10 is forbidden to be on unless it > was KVM setting it manually with 0x701 (kvm really only needs 0x301 to > get exact exception, dunno what 0x400 means, it's defined reserved, > but it doesn't matter what it means as long as ptrace can't set it ;). >
Applied, thanks. -- error compiling committee.c: too many arguments to function ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
