tree d3d00b4413b0d33254d53bbb3285be82444494d9
parent 631bc4878220932fe67fc46fc7cf7cccdb1ec597
author Gleb Natapov <gleb@redhat.com> 1287048173 +0200
committer Avi Kivity <avi@redhat.com> 1294824197 +0200

KVM: Inject asynchronous page fault into a PV guest if page is swapped out.

Send async page fault to a PV guest if it accesses swapped out memory.
Guest will choose another task to run upon receiving the fault.

Allow async page fault injection only when guest is in user mode since
otherwise guest may be in non-sleepable context and will not be able
to reschedule.

Vcpu will be halted if guest will fault on the same page again or if
vcpu executes kernel code.

Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>