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82c470121c
Use kvfree_rcu() to free the old optimized APIC instead of open coding a rough equivalent via call_rcu() and a callback function. Note, there is a subtle function change as rcu_barrier() doesn't wait on kvfree_rcu(), but does wait on call_rcu(). Not forcing rcu_barrier() to wait is safe and desirable in this case, as KVM doesn't care when an old map is actually freed. In fact, using kvfree_rcu() fixes a largely theoretical use-after-free. Because KVM _doesn't_ do rcu_barrier() to wait for kvm_apic_map_free() to complete, if KVM-the-module is unloaded in the RCU grace period before kvm_apic_map_free() is invoked, KVM's callback could run after module unload. Signed-off-by: Li RongQing <lirongqing@baidu.com> Reviewed-by: Neeraj Upadhyay <Neeraj.Upadhyay@amd.com> Link: https://lore.kernel.org/r/20250122073456.2950-1-lirongqing@baidu.com [sean: rework changelog, call out rcu_barrier() interaction] Signed-off-by: Sean Christopherson <seanjc@google.com> |
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| README | ||
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.