From: Joerg Roedel <joerg.roedel@amd.com>

This patch modifies the get_cycles_sync() function on i386 and x86_64 to
use the RDTSCP (if it is available) instruction to synchronize with the
CPU core and not CPUID. This is especially usefull when running Linux as
a KVM guest because CPUID is intercepted and will cause a VMEXIT there.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

-- 
Joerg Roedel
Operating System Research Center
AMD Saxony LLC & Co. KG