target/i386: define md-clear bit

md-clear is a new CPUID bit which is set when microcode provides the
mechanism to invoke a flush of various exploitable CPU buffers by invoking
the VERW instruction.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20190515141011.5315-2-berrange@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
(cherry picked from commit b2ae52101fca7f9547ac2f388085dbc58f8fe1c0)
Signed-off-by: Oguz Bektas <o.bektas@proxmox.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index ee4b8b47e292abc615ef57bfeffd0988fca0b27d..331a364a1ba85c6bc3f654f8f7288e0465a30b3e 100644 (file)
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -1076,7 +1076,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
         .feat_names = {
             NULL, NULL, "avx512-4vnniw", "avx512-4fmaps",
             NULL, NULL, NULL, NULL,
-            NULL, NULL, NULL, NULL,
+            NULL, NULL, "md-clear", NULL,
             NULL, NULL, NULL, NULL,
             NULL, NULL, NULL, NULL,
             NULL, NULL, NULL, NULL,