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Compared to when VMCS shadowing was added to KVM, we are reading/writing a few more fields: the PML index, the interrupt status and the preemption timer value. The first two are because we are exposing more features to nested guests, the preemption timer is simply because we have grown a new optimization. Adding them to the shadow VMCS field lists reduces the cost of a vmexit by about 1000 clock cycles for each field that exists on bare metal. On the other hand, the guest BNDCFGS and TSC offset are not written on fast paths, so remove them. Suggested-by: Jim Mattson <jmattson@google.com> Cc: Jim Mattson <jmattson@google.com> Cc: Wanpeng Li <wanpeng.li@hotmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.