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vmcs12 represents the per-CPU cache of L1 active vmcs12. This cache can be loaded by one of the following: 1) Guest making a vmcs12 active by exeucting VMPTRLD 2) Guest specifying eVMCS in VP assist page and executing VMLAUNCH/VMRESUME. Either way, vmcs12 should have revision_id of VMCS12_REVISION. Which is not equal to eVMCS revision_id which specifies used VersionNumber of eVMCS struct (e.g. KVM_EVMCS_VERSION). Specifically, this causes an issue in restoring a nested VM state because vmx_set_nested_state() verifies that vmcs12->revision_id is equal to VMCS12_REVISION which was not true in case vmcs12 was populated from an eVMCS by vmx_get_nested_state() which calls copy_enlightened_to_vmcs12(). Reviewed-by: Darren Kenny <darren.kenny@oracle.com> Signed-off-by: Liran Alon <liran.alon@oracle.com> Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.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.