MIPS: KVM: Don't save/restore lo/hi for r6

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MIPSr6 doesn't have lo/hi registers, so don't bother saving or
restoring them, and don't expose them to userland with the KVM ioctl
interface either.

In fact the lo/hi registers aren't callee saved in the MIPS ABIs anyway,
so there is no need to preserve the host lo/hi values at all when
transitioning to and from the guest (which happens via a function call).

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim KrÄmář <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>

...

This commit is contained in:

James Hogan 2016-07-04 19:35:11 +01:00 • committed by Paolo Bonzini

parent d85ebff007

commit 70e92c7ee9

2 changed files with 10 additions and 12 deletions

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16

arch/mips/kvm/entry.c

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6

arch/mips/kvm/mips.c

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