On 12/20/19 2:42 PM, Andrew Cooper wrote:
> On 20/12/2019 14:19, Jan Beulich wrote:
>> mod_l1_entry()'s need to do so went away with commit 2d0557c5cb ("x86:
>> Fold page_info lock into type_info"), and the other three never had such
>> a need, at least going back as far as 3.2.0.
>>
>> Signed-off-by: Jan Beulich <jbeul...@suse.com>
>
> These presumably want ACCESS_ONCE() to avoid introducing repeated read
> vulnerabilities? While the mappings might be safe, they still point to
> live guest data.
The L1 itself should be mapped read-only by the guest, and locked at
this point, no?
-George
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