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Re: [Xen-devel] [PATCH] xen: make debugger support configurable
- To: Juergen Gross <jgross@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 13 Nov 2019 17:26:44 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 13 Nov 2019 17:27:08 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 13/11/2019 16:22, Juergen Gross wrote:
> Debugger support in the hypervisor is rarely used and it is opening a
> way for dom0 to modify the running hypervisor by very easy means.
>
> Add a Kconfig option to control support of gdbsx. Default is off.
>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> ---
> xen/Kconfig.debug | 4 ++++
> xen/arch/x86/Kconfig | 1 -
> xen/arch/x86/domctl.c | 4 ++++
> xen/common/Kconfig | 3 ---
> xen/common/domain.c | 2 +-
> xen/include/asm-x86/debugger.h | 30 ++++++++++++++++++------------
> xen/include/xen/sched.h | 4 ++++
> 7 files changed, 31 insertions(+), 17 deletions(-)
>
> diff --git a/xen/Kconfig.debug b/xen/Kconfig.debug
> index 22573e74db..84a6e1b8eb 100644
> --- a/xen/Kconfig.debug
> +++ b/xen/Kconfig.debug
> @@ -13,9 +13,13 @@ config DEBUG
>
> if DEBUG || EXPERT = "y"
>
> +config GDBSX
> + bool
> +
> config CRASH_DEBUG
> bool "Crash Debugging Support"
> depends on X86
> + select GDBSX
> ---help---
> If you want to attach gdb to Xen to debug Xen if it crashes
> then say Y.
CRASH_DEBUG and GDBSX are unrelated.
The former is gdbstub over serial for Xen itself (which I've never seen
used, and therefore doubt functions), while the latter is a set of dom0
hypercalls used by the gdbsx utility.
I'm happy to make CONFIG_GDBSX more useful than it currently is, but I
don't think the two options want conflating.
~Andrew
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