• Christoffer Dall's avatar
    KVM: ARM: Emulation framework and CP15 emulation · 5b3e5e5b
    Christoffer Dall authored
    
    
    Adds a new important function in the main KVM/ARM code called
    handle_exit() which is called from kvm_arch_vcpu_ioctl_run() on returns
    from guest execution. This function examines the Hyp-Syndrome-Register
    (HSR), which contains information telling KVM what caused the exit from
    the guest.
    
    Some of the reasons for an exit are CP15 accesses, which are
    not allowed from the guest and this commit handles these exits by
    emulating the intended operation in software and skipping the guest
    instruction.
    
    Minor notes about the coproc register reset:
    1) We reserve a value of 0 as an invalid cp15 offset, to catch bugs in our
       table, at cost of 4 bytes per vcpu.
    
    2) Added comments on the table indicating how we handle each register, for
       simplicity of understanding.
    Reviewed-by: default avatarWill Deacon <will.deacon@arm.com>
    Reviewed-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
    Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
    Signed-off-by: default avatarChristoffer Dall <c.dall@virtualopensystems.com>
    5b3e5e5b
kvm_emulate.h 1.87 KB