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[PULL,17/48] target/i386: Export BHI_NO bit to guests

Message ID 20250124094442.13207-18-pbonzini@redhat.com (mailing list archive)
State New
Headers show
Series [PULL,01/48] rust: pl011: fix repr(C) for PL011Class | expand

Commit Message

Paolo Bonzini Jan. 24, 2025, 9:44 a.m. UTC 
From: Tao Su <tao1.su@linux.intel.com>

Branch History Injection (BHI) is a CPU side-channel vulnerability, where
an attacker may manipulate branch history before transitioning from user
to supervisor mode or from VMX non-root/guest to root mode. CPUs that set
BHI_NO bit in MSR IA32_ARCH_CAPABILITIES to indicate no additional
mitigation is required to prevent BHI.

Make BHI_NO bit available to guests.

Tested-by: Xuelian Guo <xuelian.guo@intel.com>
Signed-off-by: Tao Su <tao1.su@linux.intel.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250121020650.1899618-3-tao1.su@linux.intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target/i386/cpu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 6db8d6c9bab..33fb27a6119 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -1364,7 +1364,7 @@  FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
             "taa-no", NULL, NULL, NULL,
             NULL, "sbdr-ssdp-no", "fbsdp-no", "psdp-no",
             NULL, "fb-clear", NULL, NULL,
-            NULL, NULL, NULL, NULL,
+            "bhi-no", NULL, NULL, NULL,
             "pbrsb-no", NULL, "gds-no", "rfds-no",
             "rfds-clear", NULL, NULL, NULL,
         },