x86, kvm: Add MSR_AMD64_BU_CFG2 to the list of ignored MSRs

x86, kvm: Add MSR_AMD64_BU_CFG2 to the list of ignored MSRs

The "x86, AMD: Enable WC+ memory type on family 10 processors" patch
currently in -tip added a workaround for AMD F10h CPUs which #GPs my
guest when booted in kvm. This is because it accesses MSR_AMD64_BU_CFG2
which is not currently ignored by kvm. Do that because this MSR is only
baremetal-relevant anyway. While at it, move the ignored MSRs at the
beginning of kvm_set_msr_common so that we exit then and there.

Acked-by: Gleb Natapov <gleb@redhat.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Andre Przywara <andre@andrep.de>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1361298793-31834-2-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>