| Message ID | 1448007105-15283-1-git-send-email-thuth@redhat.com |
|---|---|
| State | Accepted |
| Headers | show |
On 20/11/2015 09:11, Thomas Huth wrote: > 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> > --- > arch/powerpc/kvm/book3s_hv_rmhandlers.S | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S > index b98889e..3983b87 100644 > --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S > +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S > @@ -2143,7 +2143,7 @@ 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) > Nice catch. Reviewed-by: Laurent Vivier <lvivier@redhat.com> -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Fri, 20 Nov 2015 09:11:45 +0100 Thomas Huth <thuth@redhat.com> wrote: > 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: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: David Gibson <dgibson@redhat.com> > --- > arch/powerpc/kvm/book3s_hv_rmhandlers.S | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S > index b98889e..3983b87 100644 > --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S > +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S > @@ -2143,7 +2143,7 @@ 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) > -- > 1.8.3.1 >
On 20/11/15 09:11, Thomas Huth wrote: > 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> > --- > arch/powerpc/kvm/book3s_hv_rmhandlers.S | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S > index b98889e..3983b87 100644 > --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S > +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S > @@ -2143,7 +2143,7 @@ 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) Ping? -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Fri, Nov 20, 2015 at 09:11:45AM +0100, Thomas Huth wrote: > 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> Thanks, applied to my kvm-ppc-next branch, with cc: stable@vger.kernel.org. Paul. -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index b98889e..3983b87 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -2143,7 +2143,7 @@ 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)
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> --- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)