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XEN used a global variable to disable the masking of MSI interrupts as XEN handles that on the hypervisor side. This turned out to be a problem with VMD as the PCI devices behind a VMD bridge are not always handled by the hypervisor and then require masking by guest. To solve this the global variable was replaced by a interrupt domain specific flag, which is set by the generic XEN PCI/MSI domain, but not by VMD or any other domain in the system. So far, so good. But the implementation (and the reviewer) missed the fact, that accessing the domain flag cannot be done directly because there are at least two situations, where this fails. Legacy architectures are not providing interrupt domains at all. The new MSI parent domains do not require to have a domain info pointer. Both cases result in a unconditional NULL pointer derefence. The PCI/MSI code already has a function to query the MSI domain specific flag in a safe way, which handles all possible cases of PCI/MSI backends. So the fix it simply to replace the open coded checks by invoking the safe helper to query the flag. -----BEGIN PGP SIGNATURE----- iQJHBAABCgAxFiEEQp8+kY+LLUocC4bMphj1TA10mKEFAmfkUA4THHRnbHhAbGlu dXRyb25peC5kZQAKCRCmGPVMDXSYoVymD/4xvcTnjjBQgesBWtkZ/wyvOx+zAoZD s6ikEnYVzG6jjiob9SXrttJS/fZDuFujmntvq1lp+Lw1MbK/k9qyeKpMUkjVw4V5 gHgPUZUkKapk2Jf3vYy23cb8CuRp9nANi7r//kzefN/pyEmfuqme3AYNJjusyEyn QfhLGE046GI2PLLS+4FKUjk+/aPEk/Pywy3moaSpDVd8Kmsus5GTmxt/AWcwGfcw 00TSRKstpew+RVLBb7NvSar0D43vtvP/8If6qkIpEttVhB6/4zTREB1z6iPjUSf0 2+90iubCdSm8wO+y0JDmA13cUct2XqW19M75imSLBIsJAlVtgWgOi2IJF787vDPJ 3bN2HeScCbl8+0e4Uv+NOi2c906k43MtC4XTrIq0nZjAuRyF9FEtdK+IrcywxuKH nuaHtlseGWg97kU49yDTi1k+tRvIpmsibKM4pKZoUZKNMfE2soCFjzj40O7hTcKJ LaN/fcDdPGnn+GMPywwIWc7e6kOIYnCqakom/x7e+KWpqfujnM3KLiyOy9iys/oL xXfKnMbbmL0CSdUrC7EJn20KFRA2ovAJ+ouzJRkFhCdERCVidY29O3VrstacbevS zQKb302PbFraGHa/MiuzyF0BuWuM0T0d12+2wEoVJpN/GTAbgO2vVbk2gvHEReXJ eMDn02f5lF659w== =ZPMY -----END PGP SIGNATURE----- Merge tag 'irq-urgent-2025-03-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull MSI irq fix from Thomas Gleixner: "An urgent fix for the XEN related PCI/MSI changes: XEN used a global variable to disable the masking of MSI interrupts as XEN handles that on the hypervisor side. This turned out to be a problem with VMD as the PCI devices behind a VMD bridge are not always handled by the hypervisor and then require masking by guest. To solve this the global variable was replaced by a interrupt domain specific flag, which is set by the generic XEN PCI/MSI domain, but not by VMD or any other domain in the system. So far, so good. But the implementation (and the reviewer) missed the fact, that accessing the domain flag cannot be done directly because there are at least two situations, where this fails. Legacy architectures are not providing interrupt domains at all. The new MSI parent domains do not require to have a domain info pointer. Both cases result in a unconditional NULL pointer derefence. The PCI/MSI code already has a function to query the MSI domain specific flag in a safe way, which handles all possible cases of PCI/MSI backends. So the fix it simply to replace the open coded checks by invoking the safe helper to query the flag" * tag 'irq-urgent-2025-03-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: PCI/MSI: Handle the NOMASK flag correctly for all PCI/MSI backends |
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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.