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Re: [Xen-devel] [XTF PATCH 08/16] vvmx: test vmxon with invalidly wide VMXON region address



On 12/16/16 20:40 +0000, Andrew Cooper wrote:
On 16/12/16 13:43, Haozhong Zhang wrote:
+static uint8_t get_cpu_paddr_bits(void)
+{
+    uint8_t paddr_bits = 36;
+    uint32_t eax;
+
+    eax = cpuid_eax(0x80000000);
+    if ( (eax >> 16) == 0x8000 && eax >= 0x80000008 )
+    {
+        eax = cpuid_eax(0x80000008);
+        paddr_bits = eax & 0xff;
+        if ( paddr_bits > 52 )
+            paddr_bits = 52;
+    }
+
+    return paddr_bits;

This is useful core functionality (and I can't believe I haven't
published a test which needs it yet).

Please extend collect_cpuid() and make maxphysaddr and maxvirtaddr
available globally along with the other vendor/family/feature
information, although I'd drop the clipping at 52 bits.


Sure.

Haozhong

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