• Benjamin Herrenschmidt's avatar
    KVM: PPC: Book3S: Add kernel emulation for the XICS interrupt controller · bc5ad3f3
    Benjamin Herrenschmidt authored
    This adds in-kernel emulation of the XICS (eXternal Interrupt
    Controller Specification) interrupt controller specified by PAPR, for
    both HV and PR KVM guests.
    
    The XICS emulation supports up to 1048560 interrupt sources.
    Interrupt source numbers below 16 are reserved; 0 is used to mean no
    interrupt and 2 is used for IPIs.  Internally these are represented in
    blocks of 1024, called ICS (interrupt controller source) entities, but
    that is not visible to userspace.
    
    Each vcpu gets one ICP (interrupt controller presentation) entity,
    used to store the per-vcpu state such as vcpu priority, pending
    interrupt state, IPI request, etc.
    
    This does not include any API or any way to connect vcpus to their
    ICP state; that will be added in later patches.
    
    This is based on an initial implementation by Michael Ellerman
    <michael@ellerman.id.au> reworked by Benjamin Herrenschmidt and
    Paul Mackerras.
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
    [agraf: fix typo, add dependency on !KVM_MPIC]
    Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
    bc5ad3f3
Kconfig 4.63 KB