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27d2dcb1b9
Including: - The race condition fixes for the AMD IOMMU driver. This are 5 patches fixing two race conditions around increase_address_space(). The first race condition was around the non-atomic update of the domain page-table root pointer and the variable containing the page-table depth (called mode). This is fixed now be merging page-table root and mode into one 64-bit field which is read/written atomically. The second race condition was around updating the page-table root pointer and making it public before the hardware caches were flushed. This could cause addresses to be mapped and returned to drivers which are not reachable by IOMMU hardware yet, causing IO page-faults. This is fixed too by adding the necessary flushes before a new page-table root is published. Related to the race condition fixes these patches also add a missing domain_flush_complete() barrier to update_domain() and a fix to bail out of the loop which tries to increase the address space when the call to increase_address_space() fails. Qian was able to trigger the race conditions under high load and memory pressure within a few days of testing. He confirmed that he has seen no issues anymore with the fixes included here. - Fix for a list-handling bug in the VirtIO IOMMU driver. -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEr9jSbILcajRFYWYyK/BELZcBGuMFAl638MYACgkQK/BELZcB GuOQxQ/5AYorgKuGkqVbob69YWZuSAEG08dlzDw4C8CDnPKXEPd0L4gJGLP7BpEh bPJo9QJtXW7zG6Hhk8sWk9/iONsThngoudaQrodJwaQRdCDGaDZlvBaezG2Vx4xb A2OrcM9lvQSODdgyf3x0O1cX7vkQ4J6nJR1Z8Fw4EufjH6TS9DR0tf8ZWHtIpHa6 Josu3M+qhUXPsn7KK5o7GtNib7sI4whLldYaASGsuaFGzod3CgA0cgmL2HfD+DWP k1EIEZTCaOq0BamtpyXbSA6o0AxwKERr/KONi1pL0xN4r0yCjsxEQ6+Rw4caqvgA zrfv3kk4a+wFAxOe0hUEtKk8Oy587LPJvIX4FnjG8hRnBrEaQC9vy4eMj05utPid PpsNQ35P+SyrxTlIp7ybIVhUvKbxih8SSpRsjx16vX+r/h4SRvWHzjpHVq/4+gIT TeZGw1g7xCIyjzn5HqLs/nMG/Ly9QHQaWia8slJJgbzI/deUXAVTy6PmMrqHB+zv e0PelKsq5lEQBrFX+r/Sg5hBViKaMykXKbXXg3KIolzlutJc2Rrzh4EEKpP/ug2/ upTXf+NvMobNxb3QLqn3IJApIirEGYQqI7lwjiUwTC5xb3EfYLUuRa5i4fbOAZIv krsVM4sNX1S32TblTMzDDOEEggPG1wPhVF5B+1emOolYHek3ShI= =gqwr -----END PGP SIGNATURE----- Merge tag 'iommu-fixes-v5.7-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu Pull iommu fixes from Joerg Roedel: - Race condition fixes for the AMD IOMMU driver. These are five patches fixing two race conditions around increase_address_space(). The first race condition was around the non-atomic update of the domain page-table root pointer and the variable containing the page-table depth (called mode). This is fixed now be merging page-table root and mode into one 64-bit field which is read/written atomically. The second race condition was around updating the page-table root pointer and making it public before the hardware caches were flushed. This could cause addresses to be mapped and returned to drivers which are not reachable by IOMMU hardware yet, causing IO page-faults. This is fixed too by adding the necessary flushes before a new page-table root is published. Related to the race condition fixes these patches also add a missing domain_flush_complete() barrier to update_domain() and a fix to bail out of the loop which tries to increase the address space when the call to increase_address_space() fails. Qian was able to trigger the race conditions under high load and memory pressure within a few days of testing. He confirmed that he has seen no issues anymore with the fixes included here. - Fix for a list-handling bug in the VirtIO IOMMU driver. * tag 'iommu-fixes-v5.7-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: iommu/virtio: Reverse arguments to list_add iommu/amd: Do not flush Device Table in iommu_map_page() iommu/amd: Update Device Table in increase_address_space() iommu/amd: Call domain_flush_complete() in update_domain() iommu/amd: Do not loop forever when trying to increase address space iommu/amd: Fix race in increase_address_space()/fetch_pte() |
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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 Restructured Text 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.