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59765db5fc
Attempt to disable virtualization during an emergency reboot if and only if there is a registered virt callback, i.e. iff a hypervisor (KVM) is active. If there's no active hypervisor, then the CPU can't be operating with VMX or SVM enabled (barring an egregious bug). Checking for a valid callback instead of simply for SVM or VMX support can also eliminates spurious NMIs by avoiding the unecessary call to nmi_shootdown_cpus_on_restart(). Note, IRQs are disabled, which prevents KVM from coming along and enabling virtualization after the fact. Reviewed-by: Kai Huang <kai.huang@intel.com> Link: https://lore.kernel.org/r/20230721201859.2307736-8-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.