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From: George Dunlap <george.dunlap@citrix.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>,
	Julien Grall <julien@xen.org>,
	 Doug Goldstein <cardoe@cardoe.com>
Cc: Sergey Dyasli <sergey.dyasli@citrix.com>,
	Stefano Stabellini <sstabellini@kernel.org>, Wei Liu <wl@xen.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	Xen-devel <xen-devel@lists.xen.org>,
	Jan Beulich <jbeulich@suse.com>,
	Ian Jackson <Ian.Jackson@citrix.com>,
	Daniel De Graaf <dgdegra@tycho.nsa.gov>
Subject: Re: [Xen-devel] [PATCH v2] xsm: hide detailed Xen version from unprivileged guests
Date: Mon, 13 Jan 2020 14:07:32 +0000	[thread overview]
Message-ID: <9c87e6fb-680d-de36-6c88-7758cc8ce125@citrix.com> (raw)
In-Reply-To: <ccfc3367-a622-ae1b-8b67-5336bbb19788@citrix.com>

On 1/13/20 2:01 PM, Andrew Cooper wrote:
> On 13/01/2020 13:39, Julien Grall wrote:
>> Hi George,
>>
>> Thank you for summarising the possibility. One question below.
>>
>> On 13/01/2020 12:51, George Dunlap wrote:
>>> 2. Block XENVER_extraversion at the hypervisor level.  Leave xen_deny()
>>> as returning "<denied>", but replace "<denied>" with "" in hvmloader so
>>> it doesn't show up in the System Info and scare users.
>>>
>>> 3. Block XENVER_extraversion at the hypervisor level.  Change xen_deny()
>>> to return a more benign string like "<hidden>".  (Perhaps also filter it
>>> in hvmloader, just for good measure.)
>>
>> My knowledge of live migration on x86 is a bit limited, but if I
>> understand correctly those two options would require a guest to reboot
>> in order to pick up the changes. Am I correct?
> 
> Not in the slightest.  The content returned changes whenever the
> hypervisor changes.

I guess Julien is talking about the filtering done in hvmloader.  That
filtering is about what's in the guest's ACPI tables; and *that* happens
only once at guest boot; so whatever the scary message is in the Windows
System Information page (or wherever it is) would stay there until the
guest reboots, regardless of which option we go with.

 -George

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  reply	other threads:[~2020-01-13 14:08 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-10 10:37 [Xen-devel] [PATCH v2] xsm: hide detailed Xen version from unprivileged guests Sergey Dyasli
2020-01-10 11:02 ` Andrew Cooper
2020-01-10 15:28   ` George Dunlap
2020-01-10 15:56     ` Jan Beulich
2020-01-10 16:45       ` Jürgen Groß
2020-01-10 17:00         ` George Dunlap
2020-01-11  3:55     ` Doug Goldstein
2020-01-11  9:35       ` George Dunlap
2020-01-13 11:01   ` Sergey Dyasli
2020-01-10 11:09 ` Jan Beulich
2020-01-11  4:02 ` Doug Goldstein
2020-01-11  9:02   ` George Dunlap
2020-01-12 18:26     ` Doug Goldstein
2020-01-13 12:51       ` George Dunlap
2020-01-13 13:39         ` Julien Grall
2020-01-13 14:01           ` Andrew Cooper
2020-01-13 14:07             ` George Dunlap [this message]
2020-01-13 14:28               ` Julien Grall
2020-01-13 14:40         ` Andrew Cooper
2020-01-14 10:19           ` Sergey Dyasli
2020-01-13 14:52         ` Julien Grall
2020-01-13 14:01       ` Ian Jackson

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