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| author | James Hogan <james.hogan@imgtec.com> | 2016-06-15 19:29:53 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-06-15 23:58:31 +0200 |
| commit | b937ff628fa76b242a74cb9087df972d5f1cecbb (patch) | |
| tree | 9d49eb854596a321fb38b70d6d79a81609188c86 /arch/mips/kvm | |
| parent | aff565aab961d3cab3299a7008af6cdef88b79a0 (diff) | |
| download | blackbird-obmc-linux-b937ff628fa76b242a74cb9087df972d5f1cecbb.tar.gz blackbird-obmc-linux-b937ff628fa76b242a74cb9087df972d5f1cecbb.zip | |
MIPS: KVM: Don't hardcode restored HWREna
KVM modifies CP0_HWREna during guest execution so it can trap and
emulate RDHWR instructions, however it always restores the hardcoded
value 0x2000000F. This assumes the presence of the UserLocal register,
and the absence of any implementation dependent or future HW registers.
Fix by exporting the value that traps.c write into CP0_HWREna, and
loading from there instead of hard coding.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/mips/kvm')
| -rw-r--r-- | arch/mips/kvm/locore.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/mips/kvm/locore.S b/arch/mips/kvm/locore.S index f87bec546366..698286c0f732 100644 --- a/arch/mips/kvm/locore.S +++ b/arch/mips/kvm/locore.S @@ -381,7 +381,7 @@ NESTED (MIPSX(GuestException), CALLFRAME_SIZ, ra) mtc0 k0, CP0_DDATA_LO /* Restore RDHWR access */ - PTR_LI k0, 0x2000000F + INT_L k0, hwrena mtc0 k0, CP0_HWRENA /* Jump to handler */ @@ -553,7 +553,7 @@ __kvm_mips_return_to_host: mtlo k0 /* Restore RDHWR access */ - PTR_LI k0, 0x2000000F + INT_L k0, hwrena mtc0 k0, CP0_HWRENA /* Restore RA, which is the address we will return to */ |
