[PATCH 1/2] cpu: define the 'ssbd' CPUID feature bit (CVE-2018-3639)

Daniel P. Berrangé <berrange@xxxxxxxxxx> · Mon, 21 May 2018 23:05:07 +0100

New microcode introduces the "Speculative Store Bypass Disable"
CPUID feature bit. This needs to be exposed to guest OS to allow
them to protect against CVE-2018-3639.

Signed-off-by: Daniel P. Berrangé <berrange@xxxxxxxxxx>
---
 src/cpu/cpu_map.xml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/cpu/cpu_map.xml b/src/cpu/cpu_map.xml
index 00a43b172c..245aec3309 100644
--- a/src/cpu/cpu_map.xml
+++ b/src/cpu/cpu_map.xml
@@ -298,6 +298,9 @@
     <feature name='spec-ctrl'>
       <cpuid eax_in='0x07' ecx_in='0x00' edx='0x04000000'/>
     </feature>
+    <feature name='ssbd'>
+      <cpuid eax_in='0x07' ecx_in='0x00' edx='0x80000000'/>
+    </feature>
 
     <!-- Processor Extended State Enumeration sub leaf 1 -->
     <feature name='xsaveopt'>
-- 
2.17.0

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