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b4dd4f6e36
The new header is intended to be used by drivers using the backdoor. Follow the KVM example using alternatives self-patching to choose between vmcall, vmmcall and io instructions. Also define two new CPU feature flags to indicate hypervisor support for vmcall- and vmmcall instructions. The new XF86_FEATURE_VMW_VMMCALL flag is needed because using XF86_FEATURE_VMMCALL might break QEMU/KVM setups using the vmmouse driver. They rely on XF86_FEATURE_VMMCALL on AMD to get the kvm_hypercall() right. But they do not yet implement vmmcall for the VMware hypercall used by the vmmouse driver. [ bp: reflow hypercall %edx usage explanation comment. ] Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Doug Covelli <dcovelli@vmware.com> Cc: Aaron Lewis <aaronlewis@google.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: linux-graphics-maintainer@vmware.com Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Cc: Nicolas Ferre <nicolas.ferre@microchip.com> Cc: Robert Hoo <robert.hu@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: virtualization@lists.linux-foundation.org Cc: <pv-drivers@vmware.com> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20190828080353.12658-3-thomas_os@shipmail.org |
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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.