Patch "KVM: PPC: Fix emulation of H_SET_DABR/X on POWER8" has been added to the 3.14-stable tree

Patch "KVM: PPC: Fix emulation of H_SET_DABR/X on POWER8" has been added to the 3.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

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

to the 3.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     kvm-ppc-fix-emulation-of-h_set_dabr-x-on-power8.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 760a7364f27d974d100118d88190e574626e18a6 Mon Sep 17 00:00:00 2001
From: Thomas Huth <thuth@redhat.com>
Date: Fri, 20 Nov 2015 09:11:45 +0100
Subject: KVM: PPC: Fix emulation of H_SET_DABR/X on POWER8

From: Thomas Huth <thuth@redhat.com>

commit 760a7364f27d974d100118d88190e574626e18a6 upstream.

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.

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/powerpc/kvm/book3s_hv_rmhandlers.S |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -1805,7 +1805,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
 
 	/* Emulate H_SET_DABR/X on P8 for the sake of compat mode guests */
 2:	rlwimi	r5, r4, 5, DAWRX_DR | DAWRX_DW
-	rlwimi	r5, r4, 1, DAWRX_WT
+	rlwimi	r5, r4, 2, DAWRX_WT
 	clrrdi	r4, r4, 3
 	std	r4, VCPU_DAWR(r3)
 	std	r5, VCPU_DAWRX(r3)


Patches currently in stable-queue which might be from thuth@redhat.com are

queue-3.14/kvm-ppc-fix-emulation-of-h_set_dabr-x-on-power8.patch