On 14.09.2012, at 03:44, Alexander Graf wrote: > > On 14.09.2012, at 03:36, Paul Mackerras wrote: > >> On Fri, Sep 14, 2012 at 02:03:15AM +0200, Alexander Graf wrote: >>> >>> Yup, Considering how different the FPU state on differnet ppc cores is, I'd be more happy with shoving it into something that allows for more dynamic control. Otherwise we'd end up with yet another struct sregs that can contain SPE registers, altivec, and a dozen additions to it :). >>> >>> Please just use one_reg for all of the register synchronization you want to add, unless there's a compelling reason to do it differently. It will make our live a lot easier in the future. If we need to transfer too much data and actually run into performance trouble, we can always add a GET_MANY_REG ioctl. >> >> It just seems perverse to ignore the existing interface that every >> other architecture uses, and instead do something unique that is >> actually slower, but whatever... > > We're slowly moving towards ONE_REG. ARM is already going full steam ahead and I'd like to have every new register in PPC be modeled with it as well. The old interface broke on us one time too often now :). > > As I said, if we run into performance problems, we will implement ways to improve performance. At the end of the day, x86 will be the odd one out. (plus your patch breaks abi compatibility with old user space) Alex -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
