mirror of
https://github.com/torvalds/linux.git
synced 2026-09-25 04:43:52 -04:00
77bcd9e623
Plumb in a dedicated hook for querying whether or not a vCPU was preempted in-kernel. Unlike literally every other architecture, x86's VMX can check if a vCPU is in kernel context if and only if the vCPU is loaded on the current pCPU. x86's kvm_arch_vcpu_in_kernel() works around the limitation by querying kvm_get_running_vcpu() and redirecting to vcpu->arch.preempted_in_kernel as needed. But that's unnecessary, confusing, and fragile, e.g. x86 has had at least one bug where KVM incorrectly used a stale preempted_in_kernel. No functional change intended. Reviewed-by: Yuan Yao <yuan.yao@intel.com> Link: https://lore.kernel.org/r/20240110003938.490206-2-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.