linux-kernel - [PATCH 4.9 28/31] KVM: VMX: Expose SSBD properly to guests, 4.9 supplement

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Message-Id: <20180612164621.898625630@linuxfoundation.org>
Date:   Tue, 12 Jun 2018 18:46:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ben Hutchings <ben@...adent.org.uk>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        David Woodhouse <dwmw@...zon.co.uk>, kvm@...r.kernel.org
Subject: [PATCH 4.9 28/31] KVM: VMX: Expose SSBD properly to guests, 4.9 supplement

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Hutchings <ben@...adent.org.uk>

Fix an additional misuse of X86_FEATURE_SSBD in
guest_cpuid_has_spec_ctrl().  This function was introduced in the
backport of SSBD support to 4.9 and is not present upstream, so it was
not fixed by commit 43462d908821 "KVM: VMX: Expose SSBD properly to
guests."

Fixes: 52817587e706 ("x86/cpufeatures: Disentangle SSBD enumeration")
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: David Woodhouse <dwmw@...zon.co.uk>
Cc: kvm@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/x86/kvm/cpuid.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -179,7 +179,7 @@ static inline bool guest_cpuid_has_spec_
 	if (best && (best->ebx & bit(X86_FEATURE_AMD_IBRS)))
 		return true;
 	best = kvm_find_cpuid_entry(vcpu, 7, 0);
-	return best && (best->edx & (bit(X86_FEATURE_SPEC_CTRL) | bit(X86_FEATURE_SSBD)));
+	return best && (best->edx & (bit(X86_FEATURE_SPEC_CTRL) | bit(X86_FEATURE_SPEC_CTRL_SSBD)));
 }
 
 static inline bool guest_cpuid_has_arch_capabilities(struct kvm_vcpu *vcpu)