Re: [PATCH -next] iommu/amd: fix a warning in increase_address_space

Thu, 17 Oct 2019 04:37:27 -0700 


> On Oct 16, 2019, at 6:59 PM, Jerry Snitselaar <[email protected]> wrote:
> 
> I guess the mode level 6 check is really for other potential callers
> increase_address_space, none exist at the moment, and the condition
> of the while loop in alloc_pte should fail if the mode level is 6.

Because there is no locking around iommu_map_page(), if there are several 
concurrent callers of it for the same domain, could it be that it silently 
corrupt data due to invalid access?





















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