Re: [PATCH 01/11] memattrs: add debug attribute

[Peter Maydell]

On Mon, 16 Nov 2020 at 19:28, Ashish Kalra <Ashish.Kalra@amd.com> wrote:
>
> From: Brijesh Singh <brijesh.singh@amd.com>
>
> From: Brijesh Singh <brijesh.singh@amd.com>
>
> Extend the MemTxAttrs to include a 'debug' flag. The flag can be used as
> general indicator that operation was triggered by the debugger.
>
> A subsequent patch will set the debug=1 when issuing a memory access
> from the gdbstub or HMP commands. This is a prerequisite to support
> debugging an encrypted guest. When a request with debug=1 is seen, the
> encryption APIs will be used to access the guest memory.

So, what counts as "debug" here, and why are debug requests
special? If "debug=1" means "can actually get at the guest memory",
why wouldn't every device model want to use it?

thanks
-- PMM