MIPS: KVM: Handle TRAP exceptions from guest kernel

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Trap instructions are used by Linux to implement BUG_ON(), however KVM
doesn't pass trap exceptions on to the guest if they occur in guest
kernel mode, instead triggering an internal error "Exception Code: 13,
not yet handled". The guest kernel then doesn't get a chance to print
the usual BUG message and stack trace.

Implement handling of the trap exception so that it gets passed to the
guest and the user is left with a more useful log message.

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

...

This commit is contained in:

James Hogan 2015-02-06 16:03:57 +00:00

parent 64bedffe49

commit 0a5604272d

5 changed files with 71 additions and 0 deletions

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8

arch/mips/include/asm/kvm_host.h

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36

arch/mips/kvm/emulate.c

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7

arch/mips/kvm/mips.c

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1

arch/mips/kvm/stats.c

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19

arch/mips/kvm/trap_emul.c

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