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KVM implementations that wrap struct kvm_vcpu with a vendor specific struct, e.g. struct vcpu_vmx, must place the vcpu member at offset 0, otherwise the usercopy region intended to encompass struct kvm_vcpu_arch will instead overlap random chunks of the vendor specific struct. E.g. padding a large number of bytes before struct kvm_vcpu triggers a usercopy warn when running with CONFIG_HARDENED_USERCOPY=y. Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Reviewed-by: Jim Mattson <jmattson@google.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.