* [PATCH] target/i386: Export TAA_NO bit to guests
@ 2019-11-19 7:23 Pawan Gupta
2019-11-19 9:02 ` Paolo Bonzini
0 siblings, 1 reply; 2+ messages in thread
From: Pawan Gupta @ 2019-11-19 7:23 UTC (permalink / raw)
To: pbonzini; +Cc: qemu-devel, ehabkost, rth
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>
---
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 a624163ac2cd..af84b04951cf 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -1205,7 +1205,7 @@ 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,
--
2.21.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] target/i386: Export TAA_NO bit to guests
2019-11-19 7:23 [PATCH] target/i386: Export TAA_NO bit to guests Pawan Gupta
@ 2019-11-19 9:02 ` Paolo Bonzini
0 siblings, 0 replies; 2+ messages in thread
From: Paolo Bonzini @ 2019-11-19 9:02 UTC (permalink / raw)
To: Pawan Gupta; +Cc: qemu-devel, ehabkost, rth
On 19/11/19 08:23, Pawan Gupta wrote:
> 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>
> ---
> 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 a624163ac2cd..af84b04951cf 100644
> --- a/target/i386/cpu.c
> +++ b/target/i386/cpu.c
> @@ -1205,7 +1205,7 @@ 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,
>
Queued, thanks.
Paolo
^ permalink raw reply [flat|nested] 2+ messages in thread
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2019-11-19 7:23 [PATCH] target/i386: Export TAA_NO bit to guests Pawan Gupta
2019-11-19 9:02 ` Paolo Bonzini
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