KVM: MIPS/MMU: Invalidate GVA PTs on ASID changes

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Implement invalidation of large ranges of virtual addresses from GVA
page tables in response to a guest ASID change (immediately for guest
kernel page table, lazily for guest user page table).

We iterate through a range of page tables invalidating entries and
freeing fully invalidated tables. To minimise overhead the exact ranges
invalidated depends on the flags argument to kvm_mips_flush_gva_pt(),
which also allows it to be used in future KVM_CAP_SYNC_MMU patches in
response to GPA changes, which unlike guest TLB mapping changes affects
guest KSeg0 mappings.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org

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This commit is contained in:

James Hogan 2016-12-16 15:57:00 +00:00

parent 57e3869cfa

commit a31b50d741

4 changed files with 165 additions and 2 deletions

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17

arch/mips/include/asm/kvm_host.h

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11

arch/mips/kvm/emulate.c

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134

arch/mips/kvm/mmu.c

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5

arch/mips/kvm/trap_emul.c

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