• Ken Hofsass's avatar
    KVM: x86: KVM_CAP_SYNC_REGS · 01643c51
    Ken Hofsass authored
    This commit implements an enhanced x86 version of S390
    KVM_CAP_SYNC_REGS functionality. KVM_CAP_SYNC_REGS "allow[s]
    userspace to access certain guest registers without having
    to call SET/GET_*REGS”. This reduces ioctl overhead which
    is particularly important when userspace is making synchronous
    guest state modifications (e.g. when emulating and/or intercepting
    instructions).
    
    Originally implemented upstream for the S390, the x86 differences
    follow:
    - userspace can select the register sets to be synchronized with kvm_run
    using bit-flags in the kvm_valid_registers and kvm_dirty_registers
    fields.
    - vcpu_events is available in addition to the regs and sregs register
    sets.
    Signed-off-by: default avatarKen Hofsass <hofsass@google.com>
    Reviewed-by: default avatarDavid Hildenbrand <david@redhat.com>
    [Removed wrapper around check for reserved kvm_valid_regs. - Radim]
    Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
    01643c51
api.txt 151 KB