On Mon, Aug 10, 2015 at 09:26:07PM +0800, Zhichao Huang wrote: > Enable trapping of the debug registers unconditionally, allowing guests to > use the debug infrastructure. > > Signed-off-by: Zhichao Huang <[email protected]> > Reviewed-by: Christoffer Dall <[email protected]> > --- > arch/arm/kvm/interrupts_head.S | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm/kvm/interrupts_head.S b/arch/arm/kvm/interrupts_head.S > index 7ad0adf..494991d 100644 > --- a/arch/arm/kvm/interrupts_head.S > +++ b/arch/arm/kvm/interrupts_head.S > @@ -792,7 +792,7 @@ ARM_BE8(rev r6, r6 ) > * (hardware reset value is 0) */ > .macro set_hdcr operation > mrc p15, 4, r2, c1, c1, 1 > - ldr r3, =(HDCR_TPM|HDCR_TPMCR) > + ldr r3, =(HDCR_TPM|HDCR_TPMCR|HDCR_TDRA|HDCR_TDOSA|HDCR_TDA)
eh, but I thought we didn't have to trap accesses to the debug registers if we switch them, because the guest is likely to be using them? Maybe I am getting confused, can you repeat for me exactly when we context-switch the registers and when we trap accesses to them? Thanks, -Christoffer > .if \operation == vmentry > orr r2, r2, r3 @ Trap some perfmon accesses > .else > -- > 1.7.12.4 > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
