From: Julien Grall <julien.grall@linaro.org>
To: Andrii Tseglytskyi <andrii.tseglytskyi@globallogic.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Ian Campbell <ian.campbell@citrix.com>,
xen-devel@lists.xen.org
Subject: Re: run time memory trap question
Date: Mon, 17 Feb 2014 12:02:39 +0000 [thread overview]
Message-ID: <5301FA5F.8020602@linaro.org> (raw)
In-Reply-To: <CAH_mUMMtiujzBtvhSDos_SzjzuGeRpbZ6QkNn3PfPN3YjpnN5A@mail.gmail.com>
On 02/17/2014 11:33 AM, Andrii Tseglytskyi wrote:
> Hi,
Hello Andrii,
> Can anyone clarify - is it possible to make a run time memory trap in
> Xen hypervisor?
I guess you are talking about ARM? If so, it's not possible right now.
> To be more specific - I see the following function:
> *int handle_mmio(mmio_info_t *info)*, which is called from *static
> void do_trap_data_abort_guest(struct cpu_user_regs *regs, union hsr
> hsr)*
> Using these calls I can define memory region and create a trap for it.
> But in current implementation I can do it only during compile time.
> Is there any way to do similar in runtime - i.e. calculate memory
> region value in code and add an entry to mmio_handlers[] ?
> Is it a good idea - just to modify/extend existing code in
> xen/arch/arm/io.c file to make it possible ?
I think yes, we might need that for a couple of new features in Xen such
as: clock drivers and multiple devices in a same page (see UARTs on
cubieboard 2).
Regards,
--
Julien Grall
next prev parent reply other threads:[~2014-02-17 12:02 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-17 11:33 run time memory trap question Andrii Tseglytskyi
2014-02-17 12:02 ` Julien Grall [this message]
2014-02-17 14:06 ` Andrii Tseglytskyi
2014-02-17 14:16 ` Julien Grall
2014-02-17 15:01 ` Andrii Tseglytskyi
2014-02-17 15:02 ` Stefano Stabellini
2014-02-17 15:19 ` Julien Grall
2014-02-17 15:38 ` Andrii Tseglytskyi
2014-02-17 15:56 ` Julien Grall
2014-02-18 11:05 ` Ian Campbell
2014-02-18 17:52 ` Andrii Tseglytskyi
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