Messages in this thread |  | | From | Andy Lutomirski <> | Date | Fri, 10 Feb 2012 09:24:01 -0800 | Subject | Re: Do the x86 kernel entry points need an xabort on TSX cpus? |
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On Fri, Feb 10, 2012 at 9:18 AM, H. Peter Anvin <hpa@linux.intel.com> wrote: > On 02/09/2012 11:40 PM, Andy Lutomirski wrote: >> >> [...] >> >> - Ring transitions: SYSENTER, SYSCALL, SYSEXIT, and SYSRET. >> >> I suspect that many bits of the kernel expect that things they do >> won't unhappen. For example, it could be fun to do: >> > > That's why entering the kernel will cause an abort. In other words, you > will ALWAYS abort when you do a read(), and you will never reach your > _xabort().
Is that architecturally guaranteed? (My manual suggests that it's specifically *not* guaranteed, which is surprising.)
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