tree 4dcd8ebdd8a2bb3afefb2028abd667970bf4d6ed
parent f0f4b930900ffa8daddb5262522c3e5c67ee1835
author Gleb Natapov <gleb@redhat.com> 1264080526 +0200
committer Marcelo Tosatti <mtosatti@redhat.com> 1267457763 -0300

KVM: x86: fix checking of cr0 validity

Move to/from Control Registers chapter of Intel SDM says.  "Reserved bits
in CR0 remain clear after any load of those registers; attempts to set
them have no impact". Control Register chapter says "Bits 63:32 of CR0 are
reserved and must be written with zeros. Writing a nonzero value to any
of the upper 32 bits results in a general-protection exception, #GP(0)."

This patch tries to implement this twisted logic.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Reported-by: Lorenzo Martignoni <martignlo@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>