On 06/14/2011 03:10 PM, Yang, Wei wrote:
This patch enalbes RDWRGSFS feature to KVM guests.
Write/read FS/GS base instructions enable user level code
to read/write FS& GS segment base registers for thread
local storage.
Patches look good, but something appears missing - usually when an
instruction is enabled by a cr4 bit, there is an additional cpuid bit
that gets turned on, so userspace can tell if it is safe to use the
instruction. Is it not the case here?
Unrelated: what about enabling it for host userspace? You'll need to
modify IST interrupt entry points (NMI/MCE etc) not to look at the value
of gsbase, but it shouldn't be too difficult.
--
error compiling committee.c: too many arguments to function
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