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From 3048f38859988e7b6d63099350769ecb9ac0e76f Mon Sep 17 00:00:00 2001
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From: Eduardo Habkost <ehabkost@redhat.com>
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Date: Tue, 3 Dec 2019 23:53:07 +0000
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Subject: [PATCH 1/2] target/i386: Export TAA_NO bit to guests
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RH-Author: Eduardo Habkost <ehabkost@redhat.com>
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Message-id: <20191203235308.590845-2-ehabkost@redhat.com>
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Patchwork-id: 92851
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O-Subject: [RHEL-8.2.0 qemu-kvm PATCH 1/2] target/i386: Export TAA_NO bit to guests
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Bugzilla: 1771971
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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From: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
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TSX Async Abort (TAA) is a side channel attack on internal buffers in
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some Intel processors similar to Microachitectural Data Sampling (MDS).
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Some future Intel processors will use the ARCH_CAP_TAA_NO bit in the
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IA32_ARCH_CAPABILITIES MSR to report that they are not vulnerable to
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TAA. Make this bit available to guests.
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Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 7fac38635e1cc5ebae34eb6530da1009bd5808e4)
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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target/i386/cpu.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/target/i386/cpu.c b/target/i386/cpu.c
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index 3effcf3..68fe865 100644
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--- a/target/i386/cpu.c
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+++ b/target/i386/cpu.c
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@@ -1144,7 +1144,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
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.feat_names = {
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"rdctl-no", "ibrs-all", "rsba", "skip-l1dfl-vmentry",
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"ssb-no", "mds-no", NULL, NULL,
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- NULL, NULL, NULL, NULL,
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+ "taa-no", NULL, NULL, NULL,
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NULL, NULL, NULL, NULL,
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NULL, NULL, NULL, NULL,
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NULL, NULL, NULL, NULL,
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--
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1.8.3.1
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