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    KVM: PPC: Book3S: Allocate guest TCEs on demand too · e1a1ef84
    Alexey Kardashevskiy 提交于
    We already allocate hardware TCE tables in multiple levels and skip
    intermediate levels when we can, now it is a turn of the KVM TCE tables.
    Thankfully these are allocated already in 2 levels.
    
    This moves the table's last level allocation from the creating helper to
    kvmppc_tce_put() and kvm_spapr_tce_fault(). Since such allocation cannot
    be done in real mode, this creates a virtual mode version of
    kvmppc_tce_put() which handles allocations.
    
    This adds kvmppc_rm_ioba_validate() to do an additional test if
    the consequent kvmppc_tce_put() needs a page which has not been allocated;
    if this is the case, we bail out to virtual mode handlers.
    
    The allocations are protected by a new mutex as kvm->lock is not suitable
    for the task because the fault handler is called with the mmap_sem held
    but kvmhv_setup_mmu() locks kvm->lock and mmap_sem in the reverse order.
    Signed-off-by: NAlexey Kardashevskiy <aik@ozlabs.ru>
    Signed-off-by: NPaul Mackerras <paulus@ozlabs.org>
    e1a1ef84
book3s_64_vio.c 18.4 KB