[Qemu-devel] [PATCH v14 1/6] i386: Set TOPOEXT unconditionally for comapatibility

[Babu Moger]

Enabling TOPOEXT feature might cause compatibility issues if
older kernels does not set this feature. Lets set this feature
unconditionally.

Signed-off-by: Babu Moger <address@hidden>
---
 target/i386/kvm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index 445e0e0..6f2cca7 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -372,6 +372,12 @@ uint32_t kvm_arch_get_supported_cpuid(KVMState *s, 
uint32_t function,
         if (host_tsx_blacklisted()) {
             ret &= ~(CPUID_7_0_EBX_RTM | CPUID_7_0_EBX_HLE);
         }
+    } else if (function == 0x80000001 && reg == R_ECX) {
+        /* Enabling topoext feature might cause compatibility issues if
+         * older kernel does not set this feature. Lets set this feature
+         * unconditionally.
+         */
+        ret |= CPUID_EXT3_TOPOEXT;
     } else if (function == 0x80000001 && reg == R_EDX) {
         /* On Intel, kvm returns cpuid according to the Intel spec,
          * so add missing bits according to the AMD spec:
-- 
1.8.3.1