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Re: [PATCH-for-8.0 v2 3/3] softmmu: Restore use of CPU watchpoint for al

From: Fabiano Rosas
Subject: Re: [PATCH-for-8.0 v2 3/3] softmmu: Restore use of CPU watchpoint for all accelerators
Date: Wed, 29 Mar 2023 11:02:06 -0300

Philippe Mathieu-Daudé <philmd@linaro.org> 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@linaro.org>

Reviewed-by: Fabiano Rosas <farosas@suse.de>

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