Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
IronPort-SDR: rrQdXBB1pzl7O0uBTA+CRVWxWpdN6M8nfQ0ZieKxjwMzK9pyi8AileE6z79hAs8BmYob0euarC
 PoUcUJg/XS3g==
IronPort-SDR: FAzpuBBf11NBdp3BnF5sXwz5dNqTfJt2k/bHeEQM4oziqWdZgdT6N8zu6h9Cn0p5afhdaaPytx
 pL1960fCdI1w==
From:   Sean Christopherson <sean.j.christopherson@intel.com>
To:     Paolo Bonzini <pbonzini@redhat.com>
Cc:     Sean Christopherson <sean.j.christopherson@intel.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Joerg Roedel <joro@8bytes.org>, kvm@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH 09/15] KVM: VMX: Check guest support for RDTSCP before processing MSR_TSC_AUX
Date:   Mon, 22 Jun 2020 15:42:43 -0700
Message-Id: <20200622224249.29562-10-sean.j.christopherson@intel.com>
In-Reply-To: <20200622224249.29562-1-sean.j.christopherson@intel.com>
References: <20200622224249.29562-1-sean.j.christopherson@intel.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Check for RDTSCP support prior to checking if MSR_TSC_AUX is in the uret
MSRs array so that the array lookup and manipulation are back-to-back.
This paves the way toward adding a helper to wrap the lookup and
manipulation.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/vmx/vmx.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index a0f4049d956f..954b9aa950f2 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -1751,9 +1751,11 @@ static void setup_msrs(struct vcpu_vmx *vmx)
 	index = __vmx_find_uret_msr(vmx, MSR_EFER);
 	if (index >= 0 && update_transition_efer(vmx, index))
 		move_msr_up(vmx, index, nr_active_uret_msrs++);
-	index = __vmx_find_uret_msr(vmx, MSR_TSC_AUX);
-	if (index >= 0 && guest_cpuid_has(&vmx->vcpu, X86_FEATURE_RDTSCP))
-		move_msr_up(vmx, index, nr_active_uret_msrs++);
+	if (guest_cpuid_has(&vmx->vcpu, X86_FEATURE_RDTSCP)) {
+		index = __vmx_find_uret_msr(vmx, MSR_TSC_AUX);
+		if (index >= 0)
+			move_msr_up(vmx, index, nr_active_uret_msrs++);
+	}
 	index = __vmx_find_uret_msr(vmx, MSR_IA32_TSX_CTRL);
 	if (index >= 0)
 		move_msr_up(vmx, index, nr_active_uret_msrs++);
-- 
2.26.0