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 4.4-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-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 760a7364f27d974d100118d88190e574626e18a6 Mon Sep 17 00:00:00 2001 From: Thomas Huth <thuth@xxxxxxxxxx> 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@xxxxxxxxxx> 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@xxxxxxxxxx> Reviewed-by: Laurent Vivier <lvivier@xxxxxxxxxx> Reviewed-by: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx> Signed-off-by: Paul Mackerras <paulus@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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 @@ -2153,7 +2153,7 @@ 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@xxxxxxxxxx are queue-4.4/kvm-ppc-fix-emulation-of-h_set_dabr-x-on-power8.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html