forked from rpms/qemu-kvm
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51 lines
2.0 KiB
51 lines
2.0 KiB
From ae6229a3e45318b1101291b99a0e894399dcb1db 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 007/100] target/i386: Export RFDS bit to guests
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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RH-MergeRequest: 245: SEV-SNP support
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RH-Jira: RHEL-39544
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Bandan Das <bdas@redhat.com>
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RH-Acked-by: Vitaly Kuznetsov <vkuznets@redhat.com>
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RH-Commit: [7/91] 7eb6cae8821a2e953d3ff2033fa2e973011ad771 (bonzini/rhel-qemu-kvm)
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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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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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(cherry picked from commit 41bdd9812863c150284a9339a048ed88c40f4df7)
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.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 efbadc3ed7..489c853b42 100644
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--- a/target/i386/cpu.c
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+++ b/target/i386/cpu.c
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@@ -1158,8 +1158,8 @@ 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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2.39.3
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