On 27/2/23 15:00, Philippe Mathieu-Daudé wrote:
The watchpoint API is specific to TCG system emulation.
I'm seeing CPUWatchpoint being used by KVM:
$ 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;
Scrolling a bit in git-history:
commit e4482ab7e3849fb5e01ccacfc13f424cc6acb8d5
Author: Alex Bennée <alex.bennee@linaro.org>
Date: Thu Dec 17 13:37:15 2015 +0000
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. When KVM_GUESTDBG_USE_HW is specified
these debug registers will be installed in place on the world switch
into the guest.
So it seems I missed something big.