tree 01e60574962d06155ebea802e0dd7832a893f474
parent 49704f26586ca87fcab4fe9323fff8db41e78910
author Nelson Elhage <nelhage@ksplice.com> 1302709453 -0400
committer Avi Kivity <avi@redhat.com> 1305115029 -0400

KVM: x86 emulator: Handle wraparound in (cs_base + offset) when fetching insns

Currently, setting a large (i.e. negative) base address for %cs does not work on
a 64-bit host. The "JOS" teaching operating system, used by MIT and other
universities, relies on such segments while bootstrapping its way to full
virtual memory management.

Signed-off-by: Nelson Elhage <nelhage@ksplice.com>
Signed-off-by: Avi Kivity <avi@redhat.com>