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From 5b1c740a646c4ecd8c85ac02429f43b84c746a04 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 23:22:01 +0100
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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: <20191203232202.555105-2-ehabkost@redhat.com>
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Patchwork-id: 92844
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O-Subject: [RHEL-7.7.z qemu-kvm PATCH 1/2] target/i386: Export TAA_NO bit to guests
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Bugzilla: 1771960
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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: Miroslav Rezanina <mrezanin@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 5aa45ba..2de8822 100644
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--- a/target-i386/cpu.c
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+++ b/target-i386/cpu.c
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@@ -201,7 +201,7 @@ static const char *cpuid_xsave_feature_name[] = {
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static const char *cpuid_arch_capabilities_feature_name[] = {
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"rdctl-no", "ibrs-all", "rsba", "skip-l1dfl-vmentry",
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"ssb-no", NULL, 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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