On Fri, Oct 30, 2015 at 12:32 PM, Borislav Petkov <[email protected]> wrote: > On Fri, Oct 30, 2015 at 12:26:42PM -0700, Andy Lutomirski wrote: >> Want to add that to the patch or make it another patch? > > Yeah, I'll make another one as it is going to document why we're > explicitly ANDing with 0xffffffffull. > >> Fair enough. I suppose that this thing is a handful of separate >> fields as opposed to being just a number. > > You mean MSR_STAR? > > Just the two upper 16-bit values. The lower 32-bit are reserved on Intel > while on AMD they're "32-bit SYSCALL Target EIP", meaning that you can > use SYSCALL on 32-bit too.
Yeah, exactly. When I wrote the "make wrmsrl a function" patch, I was dealing with MSRs that were genuinely 64-bit numbers, except that in some cases they provably fit in 32 bits, and gcc was unhappy. --Andy -- 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/
