kvm: nVMX: VMCLEAR an active shadow VMCS after last use
authorJim Mattson <jmattson@google.com>
Fri, 28 Oct 2016 15:29:39 +0000 (08:29 -0700)
committerPaolo Bonzini <pbonzini@redhat.com>
Wed, 2 Nov 2016 19:03:17 +0000 (20:03 +0100)
commit355f4fb1405ec29d0fac49b4d41fcd78cbd455d5
treeb234f5d9d0a148674735d909a74f56665ed293bd
parentea26e4ec08d4727e3a9e48a6b74695861effcbd9
kvm: nVMX: VMCLEAR an active shadow VMCS after last use

After a successful VM-entry with the "VMCS shadowing" VM-execution
control set, the shadow VMCS referenced by the VMCS link pointer field
in the current VMCS becomes active on the logical processor.

A VMCS that is made active on more than one logical processor may become
corrupted. Therefore, before an active VMCS can be migrated to another
logical processor, the first logical processor must execute a VMCLEAR
for the active VMCS. VMCLEAR both ensures that all VMCS data are written
to memory and makes the VMCS inactive.

Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-By: David Matlack <dmatlack@google.com>
Message-Id: <1477668579-22555-1-git-send-email-jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/kvm/vmx.c