x86/vmware: Add a header file for hypercall definitions

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 <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Reviewed-by: Doug Covelli <[email protected]>
Cc: Aaron Lewis <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: [email protected]
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: Nicolas Ferre <[email protected]>
Cc: Robert Hoo <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: <[email protected]>
Cc: x86-ml <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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