• Andrey Smetanin's avatar
    kvm/x86: per-vcpu apicv deactivation support · d62caabb
    Andrey Smetanin authored
    The decision on whether to use hardware APIC virtualization used to be
    taken globally, based on the availability of the feature in the CPU
    and the value of a module parameter.
    
    However, under certain circumstances we want to control it on per-vcpu
    basis.  In particular, when the userspace activates HyperV synthetic
    interrupt controller (SynIC), APICv has to be disabled as it's
    incompatible with SynIC auto-EOI behavior.
    
    To achieve that, introduce 'apicv_active' flag on struct
    kvm_vcpu_arch, and kvm_vcpu_deactivate_apicv() function to turn APICv
    off.  The flag is initialized based on the module parameter and CPU
    capability, and consulted whenever an APICv-specific action is
    performed.
    Signed-off-by: default avatarAndrey Smetanin <asmetanin@virtuozzo.com>
    Reviewed-by: default avatarRoman Kagan <rkagan@virtuozzo.com>
    Signed-off-by: default avatarDenis V. Lunev <den@openvz.org>
    CC: Gleb Natapov <gleb@kernel.org>
    CC: Paolo Bonzini <pbonzini@redhat.com>
    CC: Roman Kagan <rkagan@virtuozzo.com>
    CC: Denis V. Lunev <den@openvz.org>
    CC: qemu-devel@nongnu.org
    Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
    d62caabb
kvm_host.h 35.8 KB