MIPS: KVM: Sign extend MFC0/RDHWR results

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When emulating MFC0 instructions to load 32-bit values from guest COP0
registers and the RDHWR instruction to read the CC (Count) register,
sign extend the result to comply with the MIPS64 architecture. The
result must be in canonical 32-bit form or the guest may malfunction.

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
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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James Hogan 2016-07-08 11:53:28 +01:00 • committed by Paolo Bonzini

parent 5808844f03

commit 172e02d147

1 changed files with 4 additions and 3 deletions

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arch/mips/kvm/emulate.c

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