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From: Jan Beulich <jbeulich@suse.com>
To: Connor Davis <connojdavis@gmail.com>
Cc: Jann Horn <jannh@google.com>, Lee Jones <lee.jones@linaro.org>,
	Chunfeng Yun <chunfeng.yun@mediatek.com>,
	linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
	xen-devel@lists.xenproject.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [PATCH v2 1/4] usb: early: Avoid using DbC if already enabled
Date: Mon, 17 May 2021 16:13:55 +0200	[thread overview]
Message-ID: <ddb58cbd-0a72-f680-80f4-ce09b13a2cee@suse.com> (raw)
In-Reply-To: <16400ee4-4406-8b26-10c0-a423b2b1fed0@gmail.com>

On 17.05.2021 15:48, Connor Davis wrote:
> 
> On 5/17/21 3:32 AM, Jan Beulich wrote:
>> On 14.05.2021 02:56, Connor Davis wrote:
>>> Check if the debug capability is enabled in early_xdbc_parse_parameter,
>>> and if it is, return with an error. This avoids collisions with whatever
>>> enabled the DbC prior to linux starting.
>> Doesn't this go too far and prevent use even if firmware (perhaps
>> mistakenly) left it enabled?
> 
> Yes, but how is one supposed to distinguish the broken firmware and 
> non-broken
> 
> firmware cases?

Well, a first step might be to only check if running virtualized.
And then if your running virtualized, there might be a way to
inquire the hypervisor?

Jan


  reply	other threads:[~2021-05-17 14:14 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-14  0:56 [PATCH v2 0/4] Support xen-driven USB3 debug capability Connor Davis
2021-05-14  0:56 ` [PATCH v2 1/4] usb: early: Avoid using DbC if already enabled Connor Davis
2021-05-14  0:56   ` [PATCH v2 2/4] xen: Export dbgp functions when CONFIG_XEN_DOM0 is enabled Connor Davis
2021-05-14 14:06     ` Connor Davis
2021-05-14  0:56   ` [PATCH v2 3/4] usb: dbgp: Fix return values for reset prep and startup Connor Davis
2021-05-14 15:33     ` Boris Ostrovsky
2021-05-17  9:32   ` [PATCH v2 1/4] usb: early: Avoid using DbC if already enabled Jan Beulich
2021-05-17 13:48     ` Connor Davis
2021-05-17 14:13       ` Jan Beulich [this message]
2021-05-17 14:24         ` Connor Davis
2021-05-18 21:50           ` Mathias Nyman
2021-05-14  6:46 ` [PATCH v2 0/4] Support xen-driven USB3 debug capability Greg Kroah-Hartman
2021-05-14 14:07   ` Connor Davis

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