x86/cpuid: Move VMX/SVM out of the default policy

Nested virt is still experimental, and requires explicitly opting in to at
domain create time.  The VMX/SVM features should not be visible by default.

Also correct them from all HVM guests, to just HAP-enabled guests.  This has
been the restriction for SVM right from the outset (c/s e006a0e0aa), while
VMX was first introduced supporting shadow mode (c/s 9122c69c8d) but later
adjusted to HAP-only (c/s 77751ed79e).

There is deliberately no adjustment to xc_cpuid_apply_policy() for pre-4.14
migration compatibility.  The migration stream doesn't contain the required
architectural state for either VMX/SVM, and a nested virt VM which migrates
will explode in weird and wonderful ways.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>

xen/include/public/arch-x86/cpufeatureset.h

@@ -127,7 +127,7 @@ XEN_CPUFEATURE(PCLMULQDQ,     1*32+ 1) /*A  Carry-less multiplication */
 XEN_CPUFEATURE(DTES64,        1*32+ 2) /*   64-bit Debug Store */
 XEN_CPUFEATURE(MONITOR,       1*32+ 3) /*   Monitor/Mwait support */
 XEN_CPUFEATURE(DSCPL,         1*32+ 4) /*   CPL Qualified Debug Store */
-XEN_CPUFEATURE(VMX,           1*32+ 5) /*S  Virtual Machine Extensions */
+XEN_CPUFEATURE(VMX,           1*32+ 5) /*h  Virtual Machine Extensions */
 XEN_CPUFEATURE(SMX,           1*32+ 6) /*   Safer Mode Extensions */
 XEN_CPUFEATURE(EIST,          1*32+ 7) /*   Enhanced SpeedStep */
 XEN_CPUFEATURE(TM2,           1*32+ 8) /*   Thermal Monitor 2 */
@@ -166,7 +166,7 @@ XEN_CPUFEATURE(3DNOW,         2*32+31) /*A  3DNow! */
 /* AMD-defined CPU features, CPUID level 0x80000001.ecx, word 3 */
 XEN_CPUFEATURE(LAHF_LM,       3*32+ 0) /*A  LAHF/SAHF in long mode */
 XEN_CPUFEATURE(CMP_LEGACY,    3*32+ 1) /*!A If yes HyperThreading not valid */
-XEN_CPUFEATURE(SVM,           3*32+ 2) /*S  Secure virtual machine */
+XEN_CPUFEATURE(SVM,           3*32+ 2) /*h  Secure virtual machine */
 XEN_CPUFEATURE(EXTAPIC,       3*32+ 3) /*   Extended APIC space */
 XEN_CPUFEATURE(CR8_LEGACY,    3*32+ 4) /*S  CR8 in 32-bit mode */
 XEN_CPUFEATURE(ABM,           3*32+ 5) /*A  Advanced bit manipulation */