KVM: PPC: Fix emulation of H_SET_DABR/X on POWER8

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[ Upstream commit 760a7364f2 ]

In the old DABR register, the BT (Breakpoint Translation) bit
is bit number 61. In the new DAWRX register, the WT (Watchpoint
Translation) bit is bit number 59. So to move the DABR-BT bit
into the position of the DAWRX-WT bit, it has to be shifted by
two, not only by one. This fixes hardware watchpoints in gdb of
older guests that only use the H_SET_DABR/X interface instead
of the new H_SET_MODE interface.

Cc: stable@vger.kernel.org # v3.14+
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

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Thomas Huth 2015-11-20 09:11:45 +01:00 • committed by Sasha Levin

parent 9282d8b196

commit 87a7a77373

1 changed files with 1 additions and 1 deletions

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arch/powerpc/kvm/book3s_hv_rmhandlers.S

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