• Janakarajan Natarajan's avatar
    KVM: SVM: Enable Virtual GIF feature · 640bd6e5
    Janakarajan Natarajan authored
    Enable the Virtual GIF feature. This is done by setting bit 25 at position
    60h in the vmcb.
    
    With this feature enabled, the processor uses bit 9 at position 60h as the
    virtual GIF when executing STGI/CLGI instructions.
    
    Since the execution of STGI by the L1 hypervisor does not cause a return to
    the outermost (L0) hypervisor, the enable_irq_window and enable_nmi_window
    are modified.
    
    The IRQ window will be opened even if GIF is not set, under the assumption
    that on resuming the L1 hypervisor the IRQ will be held pending until the
    processor executes the STGI instruction.
    
    For the NMI window, the STGI intercept is set. This will assist in opening
    the window only when GIF=1.
    Signed-off-by: default avatarJanakarajan Natarajan <Janakarajan.Natarajan@amd.com>
    Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
    640bd6e5
svm.c 142 KB