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71e2409a0c
Once a DMABUF is revoked the domain will be unmapped under the pages mutex. Double unmapping will trigger a WARN, and mapping while revoked will fail. Check for revoked DMABUFs along all the map and unmap paths to resolve this. Ensure that map/unmap is always done under the pages mutex so it is synchronized with the revoke notifier. If a revoke happens between allocating the iopt_pages and the population to a domain then the population will succeed, and leave things unmapped as though revoke had happened immediately after. Currently there is no way to repopulate the domains. Userspace is expected to know if it is going to do something that would trigger revoke (eg if it is about to do a FLR) then it should go and remove the DMABUF mappings before and put the back after. The revoke is only to protect the kernel from mis-behaving userspace. Link: https://patch.msgid.link/r/3-v2-b2c110338e3f+5c2-iommufd_dmabuf_jgg@nvidia.com Reviewed-by: Nicolin Chen <nicolinc@nvidia.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Tested-by: Nicolin Chen <nicolinc@nvidia.com> Tested-by: Shuai Xue <xueshuai@linux.alibaba.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.