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KVM_SYNC_GPRS, KVM_SYNC_ACRS, KVM_SYNC_CRS and KVM_SYNC_PREFIX are available since kernel 3.10. Since we already require at least kernel 3.15 in the s390x KVM code, we can also assume that the KVM_CAP_SYNC_REGS sync code is always possible for these registers, and remove the related checks and fallbacks via KVM_SET_REGS and KVM_GET_REGS. Message-ID: <20231011080538.796999-3-thuth@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com>