On Thu, 10 Mar 2005 17:32:39 -0500, John Richard Moser <[EMAIL PROTECTED]> wrote: > CPL=3 scares me; context switches are expensive. can they have direct > hardware access? I'm sure a security model to isolate user mode drivers > could be in place. . . > > . . . huh. Xen seems to run Linux at CPL=3 and give direct hardware > access, so I guess user mode drivers are possible *shrug*. Linux isn't > a microkernel though.
Xen hypervisor runs at Ring0, while the guest OSs it supports run at Ring1. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
