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fc9465be8a
Add an extra special noinstr-friendly helper to test+mark a "register" available and use it when caching vmcs.EXIT_QUALIFICATION and vmcs.VM_EXIT_INTR_INFO. Make the caching helpers __always_inline too so that they can be used in noinstr functions. A future fix will move VMX's handling of NMI exits into the noinstr vmx_vcpu_enter_exit() so that the NMI is processed before any kind of instrumentation can trigger a fault and thus IRET, i.e. so that KVM doesn't invoke the NMI handler with NMIs enabled. Cc: Peter Zijlstra <peterz@infradead.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20221213060912.654668-2-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 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.