Philippe Mathieu-Daudé <philmd@xxxxxxxxxx> writes:
> CPU watchpoints can be use by non-TCG accelerators.
>
> KVM uses them:
>
> $ git grep CPUWatchpoint|fgrep kvm
> target/arm/kvm64.c:1558: CPUWatchpoint *wp = find_hw_watchpoint(cs, debug_exit->far);
> target/i386/kvm/kvm.c:5216:static CPUWatchpoint hw_watchpoint;
> target/ppc/kvm.c:443:static CPUWatchpoint hw_watchpoint;
> target/s390x/kvm/kvm.c:139:static CPUWatchpoint hw_watchpoint;
>
> See for example commit e4482ab7e3 ("target-arm: kvm - add support
> for HW assisted debug"):
>
> This adds basic support for HW assisted debug. The ioctl interface
> to KVM allows us to pass an implementation defined number of break
> and watch point registers. [...]
>
> This partially reverts commit 2609ec2868e6c286e755a73b4504714a0296a.
>
> Fixes: 2609ec2868 ("softmmu: Extract watchpoint API from physmem.c")
> Signed-off-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
Reviewed-by: Fabiano Rosas <farosas@xxxxxxx>
