• Paul Mackerras's avatar
    KVM: PPC: Split host-state fields out of kvmppc_book3s_shadow_vcpu · 3c42bf8a
    Paul Mackerras authored
    There are several fields in struct kvmppc_book3s_shadow_vcpu that
    temporarily store bits of host state while a guest is running,
    rather than anything relating to the particular guest or vcpu.
    This splits them out into a new kvmppc_host_state structure and
    modifies the definitions in asm-offsets.c to suit.
    
    On 32-bit, we have a kvmppc_host_state structure inside the
    kvmppc_book3s_shadow_vcpu since the assembly code needs to be able
    to get to them both with one pointer.  On 64-bit they are separate
    fields in the PACA.  This means that on 64-bit we don't need to
    copy the kvmppc_host_state in and out on vcpu load/unload, and
    in future will mean that the book3s_hv code doesn't need a
    shadow_vcpu struct in the PACA at all.  That does mean that we
    have to be careful not to rely on any values persisting in the
    hstate field of the paca across any point where we could block
    or get preempted.
    Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
    Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
    3c42bf8a
exceptions-64s.S 29.9 KB