linux-kernel - [PATCH v2 31/32] KVM: nVMX: Don't flush TLB on nested VM transition with EPT enabled

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Message-Id: <20200317045238.30434-32-sean.j.christopherson@intel.com>
Date:   Mon, 16 Mar 2020 21:52:37 -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, Ben Gardon <bgardon@...gle.com>,
        Junaid Shahid <junaids@...gle.com>,
        Liran Alon <liran.alon@...cle.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        John Haxby <john.haxby@...cle.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: [PATCH v2 31/32] KVM: nVMX: Don't flush TLB on nested VM transition with EPT enabled

Don't flush the TLB if a cached EPTP root can be reused for nested
VM-Enter/VM-Exit.  Each unique EPTP constitutes a different ASID,
cached roots are invalidated on eviction, and KVM invalidates all EPTP
contexts on global events, e.g. mmu_notifier invalidate or memslot
updates.

Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
 arch/x86/kvm/mmu/mmu.c    | 2 +-
 arch/x86/kvm/vmx/nested.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index b98482b60748..de2bd07bad7f 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5047,7 +5047,7 @@ void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly,
 		kvm_calc_shadow_ept_root_page_role(vcpu, accessed_dirty,
 						   execonly, level);
 
-	__kvm_mmu_new_cr3(vcpu, new_eptp, new_role.base, false);
+	__kvm_mmu_new_cr3(vcpu, new_eptp, new_role.base, true);
 
 	if (new_role.as_u64 == context->mmu_role.as_u64)
 		return;
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index d816f1366943..a77eab5b0e8a 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -1123,7 +1123,7 @@ static int nested_vmx_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3, bool ne
 	}
 
 	if (!nested_ept)
-		kvm_mmu_new_cr3(vcpu, cr3, false);
+		kvm_mmu_new_cr3(vcpu, cr3, enable_ept);
 
 	vcpu->arch.cr3 = cr3;
 	kvm_register_mark_available(vcpu, VCPU_EXREG_CR3);
-- 
2.24.1