linux-kernel - [PATCH v2 07/10] KVM: VMX: Explicitly check for hv_remote_flush

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Date:   Tue, 20 Oct 2020 14:56:10 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 07/10] KVM: VMX: Explicitly check for hv_remote_flush_tlb when loading pgd

Explicitly check that kvm_x86_ops.tlb_remote_flush() points at Hyper-V's
implementation for PV flushing instead of assuming that a non-NULL
implementation means running on Hyper-V.  Wrap the related logic in
ifdeffery as hv_remote_flush_tlb() is defined iff CONFIG_HYPERV!=n.

Short term, the explicit check makes it more obvious why a non-NULL
tlb_remote_flush() triggers EPTP shenanigans.  Long term, this will
allow TDX to define its own implementation of tlb_remote_flush() without
running afoul of Hyper-V.

Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
 arch/x86/kvm/vmx/vmx.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index e6569bafacdc..55d6b699d8e3 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -560,6 +560,21 @@ static int hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu)
 
 #endif /* IS_ENABLED(CONFIG_HYPERV) */
 
+static void hv_load_mmu_eptp(struct kvm_vcpu *vcpu, u64 eptp)
+{
+#if IS_ENABLED(CONFIG_HYPERV)
+	struct kvm_vmx *kvm_vmx = to_kvm_vmx(vcpu->kvm);
+
+	if (kvm_x86_ops.tlb_remote_flush == hv_remote_flush_tlb) {
+		spin_lock(&kvm_vmx->ept_pointer_lock);
+		to_vmx(vcpu)->ept_pointer = eptp;
+		if (eptp != kvm_vmx->hv_tlb_eptp)
+			kvm_vmx->hv_tlb_eptp = INVALID_PAGE;
+		spin_unlock(&kvm_vmx->ept_pointer_lock);
+	}
+#endif
+}
+
 /*
  * Comment's format: document - errata name - stepping - processor name.
  * Refer from
@@ -3040,13 +3055,7 @@ static void vmx_load_mmu_pgd(struct kvm_vcpu *vcpu, unsigned long pgd,
 		eptp = construct_eptp(vcpu, pgd, pgd_level);
 		vmcs_write64(EPT_POINTER, eptp);
 
-		if (kvm_x86_ops.tlb_remote_flush) {
-			spin_lock(&to_kvm_vmx(kvm)->ept_pointer_lock);
-			to_vmx(vcpu)->ept_pointer = eptp;
-			if (eptp != to_kvm_vmx(kvm)->hv_tlb_eptp)
-				to_kvm_vmx(kvm)->hv_tlb_eptp = INVALID_PAGE;
-			spin_unlock(&to_kvm_vmx(kvm)->ept_pointer_lock);
-		}
+		hv_load_mmu_eptp(vcpu, eptp);
 
 		if (!enable_unrestricted_guest && !is_paging(vcpu))
 			guest_cr3 = to_kvm_vmx(kvm)->ept_identity_map_addr;
-- 
2.28.0