[v1] target/i386: Export GDS_NO bit to guests

[PATCH] target/i386: Export GDS_NO bit to guests

Pawan Gupta posted 1 patch 9 months, 1 week ago

Diff against v2
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git fetch https://github.com/patchew-project/qemu tags/patchew/c373f3f92b542b738f296d44bb6a916a1cded7bd.1691774049.git.pawan.kumar.gupta@linux.intel.com

There is a newer version of this series

target/i386/cpu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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[PATCH] target/i386: Export GDS_NO bit to guests

Posted by Pawan Gupta 9 months, 1 week ago

Gather Data Sampling (GDS) is a side-channel attack using Gather
instructions. Some Intel processors will set ARCH_CAP_GDS_NO bit in
MSR IA32_ARCH_CAPABILITIES to report that they are not vulnerable to
GDS.

Make this bit available to guests.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
---
This is just compile tested.


 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 97ad229d8ba3..48709b77689f 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -1155,7 +1155,7 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
             NULL, "sbdr-ssdp-no", "fbsdp-no", "psdp-no",
             NULL, "fb-clear", NULL, NULL,
             NULL, NULL, NULL, NULL,
-            "pbrsb-no", NULL, NULL, NULL,
+            "pbrsb-no", NULL, "gds-no", NULL,
             NULL, NULL, NULL, NULL,
         },
         .msr = {
-- 
2.34.1

Re: [PATCH] target/i386: Export GDS_NO bit to guests

Posted by Daniel Sneddon 9 months, 1 week ago

On 8/11/23 10:18, Pawan Gupta wrote:
> This is just compile tested.

I used this patch when testing the GDS Linux patches, so you can add a T-B from me.