KVM/VMX: Emulate MSR_IA32_ARCH_CAPABILITIES

Intel processors use MSR_IA32_ARCH_CAPABILITIES MSR to indicate RDCL_NO
(bit 0) and IBRS_ALL (bit 1). This is a read-only MSR. By default the
contents will come directly from the hardware, but user-space can still
override it.

[dwmw2: The bit in kvm_cpuid_7_0_edx_x86_features can be unconditional]

Signed-off-by: KarimAllah Ahmed <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Paolo Bonzini <[email protected]>
Reviewed-by: Darren Kenny <[email protected]>
Reviewed-by: Jim Mattson <[email protected]>
Reviewed-by: Konrad Rzeszutek Wilk <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Jun Nakajima <[email protected]>
Cc: [email protected]
Cc: Dave Hansen <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Asit Mallick <[email protected]>
Cc: Arjan Van De Ven <[email protected]>
Cc: Greg KH <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Tim Chen <[email protected]>
Cc: Ashok Raj <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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