KVM: MIPS: Use uaccess to read/modify guest instructions

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Now that we have GVA page tables, use standard user accesses with page
faults disabled to read & modify guest instructions. This should be more
robust (than the rather dodgy method of accessing guest mapped segments
by just directly addressing them) and will also work with Enhanced
Virtual Addressing (EVA) host kernel configurations where dedicated
instructions are needed for accessing user mode memory.

For simplicity and speed we do this regardless of the guest segment the
address resides in, rather than handling guest KSeg0 specially with
kmap_atomic() as before.

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 2016-08-19 15:27:22 +01:00

parent 7a156e9f82

commit dacc3ed1dd

4 changed files with 22 additions and 94 deletions

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2

arch/mips/include/asm/kvm_host.h

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26

arch/mips/kvm/dyntrans.c

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75

arch/mips/kvm/mmu.c

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9

arch/mips/kvm/trap_emul.c

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