[Xen-devel] [PATCH 5/6] x86/cpuid: Handle the long vendor string in guest_cpuid()

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Leaves 0x80000002 through 0x80000004 are plain ASCII text, and require no
specific recalculation.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
---
 xen/arch/x86/cpuid.c        | 3 +++
 xen/include/asm-x86/cpuid.h | 4 ++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/cpuid.c b/xen/arch/x86/cpuid.c
index dc76cf4..7926d0b 100644
--- a/xen/arch/x86/cpuid.c
+++ b/xen/arch/x86/cpuid.c
@@ -706,6 +706,7 @@ static void pv_cpuid(uint32_t leaf, uint32_t subleaf, 
struct cpuid_leaf *res)
     case 0x7:
     case XSTATE_CPUID:
     case 0x80000000:
+    case 0x80000002 ... 0x80000004:
         ASSERT_UNREACHABLE();
         /* Now handled in guest_cpuid(). */
     }
@@ -856,6 +857,7 @@ static void hvm_cpuid(uint32_t leaf, uint32_t subleaf, 
struct cpuid_leaf *res)
     case 0x7:
     case XSTATE_CPUID:
     case 0x80000000:
+    case 0x80000002 ... 0x80000004:
         ASSERT_UNREACHABLE();
         /* Now handled in guest_cpuid(). */
     }
@@ -936,6 +938,7 @@ void guest_cpuid(const struct vcpu *v, uint32_t leaf,
             goto legacy;
 
         case 0x80000000:
+        case 0x80000002 ... 0x80000004:
             *res = p->extd.raw[leaf & 0xffff];
             break;
         }
diff --git a/xen/include/asm-x86/cpuid.h b/xen/include/asm-x86/cpuid.h
index 4712b73..d181e9a 100644
--- a/xen/include/asm-x86/cpuid.h
+++ b/xen/include/asm-x86/cpuid.h
@@ -81,7 +81,7 @@ struct cpuid_policy
      *   - All of the feat and xstate unions
      *   - max_{,sub}leaf
      *   - All FEATURESET_* words
-     *   - Short vendor infomation
+     *   - Short and long vendor infomation
      *
      * Per-domain objects:
      *
@@ -89,7 +89,7 @@ struct cpuid_policy
      *   - All of the feat and xstate unions
      *   - max_{,sub}leaf
      *   - All FEATURESET_* words
-     *   - Short vendor infomation
+     *   - Short and long vendor infomation
      *
      * Everything else should be considered inaccurate, and not necesserily 0.
      */
-- 
2.1.4


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel