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11d984633f
Move user_return_msrs allocation/free from vendor modules (kvm-intel.ko and kvm-amd.ko) (un)loading time to kvm.ko's to make it less risky to access user_return_msrs in kvm.ko. Tying the lifetime of user_return_msrs to vendor modules makes every access to user_return_msrs prone to use-after-free issues as vendor modules may be unloaded at any time. Opportunistically turn the per-CPU variable into full structs, as there's no practical difference between statically allocating the memory and allocating it unconditionally during module_init(). Zero out kvm_nr_uret_msrs on vendor module exit to further minimize the chances of consuming stale data, and WARN on vendor module load if KVM thinks there are existing user-return MSRs. Note! The user-return MSRs also need to be "destroyed" if ops->hardware_setup() fails, as both SVM and VMX expect common KVM to clean up (because common code, not vendor code, is responsible for kvm_nr_uret_msrs). Signed-off-by: Chao Gao <chao.gao@intel.com> Co-developed-by: Sean Christopherson <seanjc@google.com> Link: https://patch.msgid.link/20251108013601.902918-1-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
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.