Fix failures caused by fork() interaction with internal slots

fork() has a WONTFIX bug where a page with an elevated reference count will be COWed such that the page address changes even in the process which has taken the reference. This interacts badly with internal memory slots that install pages in vmcs registers, such as the APIC access page.

This patchset disables fork() for these slots.

Avi Kivity (2):
KVM: Keep slot ID in memory slot structure
KVM: Prevent internal slots from being COWed

 arch/x86/kvm/x86.c       |    5 +++++
 include/linux/kvm_host.h |    1 +
 virt/kvm/kvm_main.c      |    1 +
 3 files changed, 7 insertions(+), 0 deletions(-)