KVM: PPC: Book3S PR: Preserve storage control bits

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PR KVM page fault handler performs eaddr to pte translation for a guest,
however kvmppc_mmu_book3s_64_xlate() does not preserve WIMG bits
(storage control) in the kvmppc_pte struct. If PR KVM is running as
a second level guest under HV KVM, and PR KVM tries inserting HPT entry,
this fails in HV KVM if it already has this mapping.

This preserves WIMG bits between kvmppc_mmu_book3s_64_xlate() and
kvmppc_mmu_map_page().

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

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Alexey Kardashevskiy 2017-03-24 17:49:22 +11:00 • committed by Paul Mackerras

parent bd9166ffe6

commit 96df226769

4 changed files with 5 additions and 1 deletions

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arch/powerpc/include/asm/kvm_host.h

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arch/powerpc/kvm/book3s_64_mmu.c

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arch/powerpc/kvm/book3s_64_mmu_host.c

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arch/powerpc/kvm/book3s_pr.c

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