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c9b8b07cde
Allocate the emulation context instead of embedding it in struct
kvm_vcpu_arch.
Dynamic allocation provides several benefits:
- Shrinks the size x86 vcpus by ~2.5k bytes, dropping them back below
the PAGE_ALLOC_COSTLY_ORDER threshold.
- Allows for dropping the include of kvm_emulate.h from asm/kvm_host.h
and moving kvm_emulate.h into KVM's private directory.
- Allows a reducing KVM's attack surface by shrinking the amount of
vCPU data that is exposed to usercopy.
- Allows a future patch to disable the emulator entirely, which may or
may not be a realistic endeavor.
Mark the entire struct as valid for usercopy to maintain existing
behavior with respect to hardened usercopy. Future patches can shrink
the usercopy range to cover only what is necessary.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.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.