x86/vvmx: Fix WRMSR interception of VMX MSRs

x86/vvmx: Fix WRMSR interception of VMX MSRs

FEATURE_CONTROL is already read with LOCK bit set (so is unmodifiable), and
all VMX MSRs are read-only.  Also, fix the MSR_IA32_VMX_TRUE_ENTRY_CTLS bound
to be MSR_IA32_VMX_VMFUNC, rather than having the intervening MSRs falling
into the default case.

Raise #GP faults if the guest tries to modify any of them.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Kevin Tian <kevin.tian@intel.com>