KVM: PPC: Book3S HV: Don't rely on host's page size information

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This removes the dependence of KVM on the mmu_psize_defs array (which
stores information about hardware support for various page sizes) and
the things derived from it, chiefly hpte_page_sizes[], hpte_page_size(),
hpte_actual_page_size() and get_sllp_encoding().  We also no longer
rely on the mmu_slb_size variable or the MMU_FTR_1T_SEGMENTS feature
bit.

The reason for doing this is so we can support a HPT guest on a radix
host.  In a radix host, the mmu_psize_defs array contains information
about page sizes supported by the MMU in radix mode rather than the
page sizes supported by the MMU in HPT mode.  Similarly, mmu_slb_size
and the MMU_FTR_1T_SEGMENTS bit are not set.

Instead we hard-code knowledge of the behaviour of the HPT MMU in the
POWER7, POWER8 and POWER9 processors (which are the only processors
supported by HV KVM) - specifically the encoding of the LP fields in
the HPT and SLB entries, and the fact that they have 32 SLB entries
and support 1TB segments.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

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This commit is contained in:

Paul Mackerras 2017-09-11 15:29:45 +10:00

parent 3e8f150a3b

commit 8dc6cca556

4 changed files with 126 additions and 53 deletions

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116

arch/powerpc/include/asm/kvm_book3s_64.h

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13

arch/powerpc/kvm/book3s_64_mmu_hv.c

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39

arch/powerpc/kvm/book3s_hv.c

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11

arch/powerpc/kvm/book3s_hv_rm_mmu.c

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