KVM: MIPS/T&E: active_mm = init_mm in guest context

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Set init_mm as the active_mm and update mm_cpumask(current->mm) to
reflect that it isn't active when in guest context. This prevents cache
management code from attempting cache flushes on host virtual addresses
while in guest context, for example due to a cache management IPIs or
later when writing of dynamically translated code hits copy on write.

We do this using helpers in static kernel code to avoid having to export
init_mm to modules.

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 2016-11-15 00:06:05 +00:00

parent 91cdee5710

commit a7ebb2e410

3 changed files with 50 additions and 1 deletions

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4

arch/mips/include/asm/kvm_host.h

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35

arch/mips/kvm/tlb.c

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12

arch/mips/kvm/trap_emul.c

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