[Xen-devel] [PATCH RFC 30/31] x86/domctl: Update PV domain cpumasks when setting cpuid policy

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

This allows PV domains with different featuresets to observe different values
from a native cpuid instruction, on supporting hardware.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
---
 xen/arch/x86/domctl.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
index 5eb8f00..967e8e7 100644
--- a/xen/arch/x86/domctl.c
+++ b/xen/arch/x86/domctl.c
@@ -77,6 +77,74 @@ static void update_domain_cpuid_info(struct domain *d,
         d->arch.x86_model = (ctl->eax >> 4) & 0xf;
         if ( d->arch.x86 >= 0x6 )
             d->arch.x86_model |= (ctl->eax >> 12) & 0xf0;
+
+        if ( is_pv_domain(d) )
+        {
+            uint64_t mask = cpumask_defaults._1cd;
+
+            if ( boot_cpu_data.x86_vendor == X86_VENDOR_INTEL )
+                mask &= ((uint64_t)ctl->edx << 32) | ctl->ecx;
+            else if ( boot_cpu_data.x86_vendor == X86_VENDOR_AMD )
+                mask &= ((uint64_t)ctl->ecx << 32) | ctl->edx;
+
+            d->arch.pv_domain.masks->_1cd = mask;
+        }
+        break;
+
+    case 6:
+        if ( is_pv_domain(d) )
+        {
+            uint64_t mask = cpumask_defaults._6c;
+
+            if ( boot_cpu_data.x86_vendor == X86_VENDOR_AMD )
+                mask &= ((~0ULL << 32) | ctl->ecx);
+
+            d->arch.pv_domain.masks->_6c = mask;
+        }
+        break;
+
+    case 7:
+        if ( ctl->input[1] != 0 )
+            break;
+
+        if ( is_pv_domain(d) )
+        {
+            uint64_t mask = cpumask_defaults._7ab0;
+
+            if ( boot_cpu_data.x86_vendor == X86_VENDOR_AMD )
+                mask &= ((uint64_t)ctl->eax << 32) | ctl->ebx;
+
+            d->arch.pv_domain.masks->_7ab0 = mask;
+        }
+        break;
+
+    case 0xd:
+        if ( ctl->input[1] != 1 )
+            break;
+
+        if ( is_pv_domain(d) )
+        {
+            uint64_t mask = cpumask_defaults.Da1;
+
+            if ( boot_cpu_data.x86_vendor == X86_VENDOR_INTEL )
+                mask &= ((~0ULL << 32) | ctl->eax);
+
+            d->arch.pv_domain.masks->Da1 = mask;
+        }
+        break;
+
+    case 0x80000001:
+        if ( is_pv_domain(d) )
+        {
+            uint64_t mask = cpumask_defaults.e1cd;
+
+            if ( boot_cpu_data.x86_vendor == X86_VENDOR_INTEL )
+                mask &= ((uint64_t)ctl->edx << 32) | ctl->ecx;
+            else if ( boot_cpu_data.x86_vendor == X86_VENDOR_AMD )
+                mask &= ((uint64_t)ctl->ecx << 32) | ctl->edx;
+
+            d->arch.pv_domain.masks->e1cd = mask;
+        }
         break;
     }
 }
-- 
2.1.4


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