[PATCH v4 3/3] KVM: x86: AMD's IBPB is not equivalent to Intel's IBPB

[Jim Mattson]

>From Intel's documention [1], "CPUID.(EAX=07H,ECX=0):EDX[26]
enumerates support for indirect branch restricted speculation (IBRS)
and the indirect branch predictor barrier (IBPB)." Further, from [2],
"Software that executed before the IBPB command cannot control the
predicted targets of indirect branches (4) executed after the command
on the same logical processor," where footnote 4 reads, "Note that
indirect branches include near call indirect, near jump indirect and
near return instructions. Because it includes near returns, it follows
that **RSB entries created before an IBPB command cannot control the
predicted targets of returns executed after the command on the same
logical processor.**" [emphasis mine]

On the other hand, AMD's IBPB "may not prevent return branch
predictions from being specified by pre-IBPB branch targets" [3].

However, some AMD processors have an "enhanced IBPB" [terminology
mine] which does clear the return address predictor. This feature is
enumerated by CPUID.80000008:EDX.IBPB_RET[bit 30] [4].

Adjust the cross-vendor features enumerated by KVM_GET_SUPPORTED_CPUID
accordingly.

[1] https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/technical-documentation/cpuid-enumeration-and-architectural-msrs.html
[2] https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/technical-documentation/speculative-execution-side-channel-mitigations.html#Footnotes
[3] https://www.amd.com/en/resources/product-security/bulletin/amd-sb-1040.html
[4] https://www.amd.com/content/dam/amd/en/documents/processor-tech-docs/programmer-references/24594.pdf

Fixes: 0c54914d0c52 ("KVM: x86: use Intel speculation bugs and features as derived in generic x86 code")
Suggested-by: Venkatesh Srinivas <venkateshs@xxxxxxxxxxxx>
Signed-off-by: Jim Mattson <jmattson@xxxxxxxxxx>
---
 arch/x86/kvm/cpuid.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index ec7b2ca3b4d3..600d79ea22be 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -690,7 +690,9 @@ void kvm_set_cpu_caps(void)
 	kvm_cpu_cap_set(X86_FEATURE_TSC_ADJUST);
 	kvm_cpu_cap_set(X86_FEATURE_ARCH_CAPABILITIES);
 
-	if (boot_cpu_has(X86_FEATURE_IBPB) && boot_cpu_has(X86_FEATURE_IBRS))
+	if (boot_cpu_has(X86_FEATURE_AMD_IBPB_RET) &&
+	    boot_cpu_has(X86_FEATURE_AMD_IBPB) &&
+	    boot_cpu_has(X86_FEATURE_AMD_IBRS))
 		kvm_cpu_cap_set(X86_FEATURE_SPEC_CTRL);
 	if (boot_cpu_has(X86_FEATURE_STIBP))
 		kvm_cpu_cap_set(X86_FEATURE_INTEL_STIBP);
@@ -759,8 +761,12 @@ void kvm_set_cpu_caps(void)
 	 * arch/x86/kernel/cpu/bugs.c is kind enough to
 	 * record that in cpufeatures so use them.
 	 */
-	if (boot_cpu_has(X86_FEATURE_IBPB))
+	if (boot_cpu_has(X86_FEATURE_IBPB)) {
 		kvm_cpu_cap_set(X86_FEATURE_AMD_IBPB);
+		if (boot_cpu_has(X86_FEATURE_SPEC_CTRL) &&
+		    !boot_cpu_has_bug(X86_BUG_EIBRS_PBRSB))
+			kvm_cpu_cap_set(X86_FEATURE_AMD_IBPB_RET);
+	}
 	if (boot_cpu_has(X86_FEATURE_IBRS))
 		kvm_cpu_cap_set(X86_FEATURE_AMD_IBRS);
 	if (boot_cpu_has(X86_FEATURE_STIBP))
-- 
2.46.0.662.g92d0881bb0-goog