KVM: PPC: Book3S: Allocate guest TCEs on demand too

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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: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

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This commit is contained in:

Alexey Kardashevskiy 2019-03-29 16:43:26 +11:00 • committed by Paul Mackerras

parent 2001825efc

commit e1a1ef84cd

4 changed files with 110 additions and 33 deletions

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3

arch/powerpc/include/asm/kvm_host.h

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2

arch/powerpc/include/asm/kvm_ppc.h

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72

arch/powerpc/kvm/book3s_64_vio.c

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66

arch/powerpc/kvm/book3s_64_vio_hv.c

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