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target/i386: Export RFDS bit to guests 

Register File Data Sampling (RFDS) is a CPU side-channel vulnerability
that may expose stale register value. CPUs that set RFDS_NO bit in MSR
IA32_ARCH_CAPABILITIES indicate that they are not vulnerable to RFDS.
Similarly, RFDS_CLEAR indicates that CPU is affected by RFDS, and has
the microcode to help mitigate RFDS.

Make RFDS_CLEAR and RFDS_NO bits available to guests.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Message-ID: <9a38877857392b5c2deae7e7db1b170d15510314.1710341348.git.pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Pawan Gupta 2024-03-13 07:53:23 -07:00 committed by Paolo Bonzini
parent 6e82d3b622
commit 41bdd98128
1 changed files with 2 additions and 2 deletions
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4
target/i386/cpu.c
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@ -1158,8 +1158,8 @@ 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, "gds-no", NULL,
NULL, NULL, NULL, NULL,
"pbrsb-no", NULL, "gds-no", "rfds-no",
"rfds-clear", NULL, NULL, NULL,
},
.msr = {
.index = MSR_IA32_ARCH_CAPABILITIES,