48 lines
1.8 KiB
Diff
48 lines
1.8 KiB
Diff
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From b167617657fa078c4ea14cf54138ff5a4ce180f3 Mon Sep 17 00:00:00 2001
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From: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
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Date: Wed, 13 Mar 2024 07:53:23 -0700
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Subject: [PATCH] target/i386: Export RFDS bit to guests
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commit 41bdd9812863c150284a9339a048ed88c40f4df7 upstream.
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Register File Data Sampling (RFDS) is a CPU side-channel vulnerability
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that may expose stale register value. CPUs that set RFDS_NO bit in MSR
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IA32_ARCH_CAPABILITIES indicate that they are not vulnerable to RFDS.
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Similarly, RFDS_CLEAR indicates that CPU is affected by RFDS, and has
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the microcode to help mitigate RFDS.
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Make RFDS_CLEAR and RFDS_NO bits available to guests.
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Intel-SIG: commit 41bdd9812863 target/i386: Export RFDS bit to guests.
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8.2.0-Add SRF CPU module support
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Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
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Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
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Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
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Message-ID: <9a38877857392b5c2deae7e7db1b170d15510314.1710341348.git.pawan.kumar.gupta@linux.intel.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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[ Quanxian Wang: amend commit log ]
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Signed-off-by: Quanxian Wang <quanxian.wang@intel.com>
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---
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target/i386/cpu.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/target/i386/cpu.c b/target/i386/cpu.c
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index 57a832cea2..fd32c64f99 100644
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--- a/target/i386/cpu.c
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+++ b/target/i386/cpu.c
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@@ -1157,8 +1157,8 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
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NULL, "sbdr-ssdp-no", "fbsdp-no", "psdp-no",
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NULL, "fb-clear", NULL, NULL,
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NULL, NULL, NULL, NULL,
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- "pbrsb-no", NULL, "gds-no", NULL,
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- NULL, NULL, NULL, NULL,
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+ "pbrsb-no", NULL, "gds-no", "rfds-no",
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+ "rfds-clear", NULL, NULL, NULL,
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},
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.msr = {
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.index = MSR_IA32_ARCH_CAPABILITIES,
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--
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2.27.0
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