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target/i386: Export TAA_NO bit to guests

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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>

Signed-off-by: Jingyi Wang <wangjingyi11@huawei.com>
This commit is contained in:
Chen Qun 2019-11-18 23:23:27 -08:00
parent 6713c545f7
commit 3b6358a8ac
1 changed files with 36 additions and 0 deletions
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36
target-i386-Export-TAA_NO-bit-to-guests.patch Normal file
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@ -0,0 +1,36 @@
From c828229e1dc4a3d0837071db4c08f7860dc24755 Mon Sep 17 00:00:00 2001
From: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Date: Mon, 18 Nov 2019 23:23:27 -0800
Subject: [PATCH] target/i386: Export TAA_NO bit to guests
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>
Signed-off-by: Jingyi Wang <wangjingyi11@huawei.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 29836cb2a5..5af4fca350 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -1209,7 +1209,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
.feat_names = {
"rdctl-no", "ibrs-all", "rsba", "skip-l1dfl-vmentry",
"ssb-no", "mds-no", "pschange-mc-no", NULL,
- NULL, NULL, NULL, NULL,
+ "taa-no", NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
--
2.27.0