From 3048f38859988e7b6d63099350769ecb9ac0e76f Mon Sep 17 00:00:00 2001

From: Eduardo Habkost <ehabkost@redhat.com>

Date: Tue, 3 Dec 2019 23:53:07 +0000

Subject: [PATCH 1/2] target/i386: Export TAA_NO bit to guests

RH-Author: Eduardo Habkost <ehabkost@redhat.com>

Message-id: <20191203235308.590845-2-ehabkost@redhat.com>

Patchwork-id: 92851

O-Subject: [RHEL-8.2.0 qemu-kvm PATCH 1/2] target/i386: Export TAA_NO bit to guests

Bugzilla: 1771971

RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>

RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

RH-Acked-by: Igor Mammedov <imammedo@redhat.com>

From: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>

TSX Async Abort (TAA) is a side channel attack on internal buffers in

some Intel processors similar to Microachitectural Data Sampling (MDS).

Some future Intel processors will use the ARCH_CAP_TAA_NO bit in the

IA32_ARCH_CAPABILITIES MSR to report that they are not vulnerable to

TAA. Make this bit available to guests.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

(cherry picked from commit 7fac38635e1cc5ebae34eb6530da1009bd5808e4)

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>

---

 target/i386/cpu.c | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c

index 3effcf3..68fe865 100644

--- a/target/i386/cpu.c

+++ b/target/i386/cpu.c

@@ -1144,7 +1144,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {

         .feat_names = {

             "rdctl-no", "ibrs-all", "rsba", "skip-l1dfl-vmentry",

             "ssb-no", "mds-no", NULL, NULL,

-            NULL, NULL, NULL, NULL,

+            "taa-no", NULL, NULL, NULL,

             NULL, NULL, NULL, NULL,

             NULL, NULL, NULL, NULL,

             NULL, NULL, NULL, NULL,

-- 

1.8.3.1