• Oliver Upton's avatar
    KVM: nVMX: Emulate MTF when performing instruction emulation · 5ef8acbd
    Oliver Upton authored
    Since commit 5f3d45e7 ("kvm/x86: add support for
    MONITOR_TRAP_FLAG"), KVM has allowed an L1 guest to use the monitor trap
    flag processor-based execution control for its L2 guest. KVM simply
    forwards any MTF VM-exits to the L1 guest, which works for normal
    instruction execution.
    
    However, when KVM needs to emulate an instruction on the behalf of an L2
    guest, the monitor trap flag is not emulated. Add the necessary logic to
    kvm_skip_emulated_instruction() to synthesize an MTF VM-exit to L1 upon
    instruction emulation for L2.
    
    Fixes: 5f3d45e7 ("kvm/x86: add support for MONITOR_TRAP_FLAG")
    Signed-off-by: default avatarOliver Upton <oupton@google.com>
    Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
    5ef8acbd
kvm_host.h 50.1 KB