linux-kernel - [PATCH v2 11/32] KVM: VMX: Handle INVVPID fallback logic in vpid_sync_vcpu

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Date:   Mon, 16 Mar 2020 21:52:17 -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 11/32] KVM: VMX: Handle INVVPID fallback logic in vpid_sync_vcpu_addr()

Directly invoke vpid_sync_context() to do a global INVVPID when the
individual address variant is not supported instead of deferring such
behavior to the caller.  This allows for additional consolidation of
code as the logic is basically identical to the emulation of the
individual address variant in handle_invvpid().

No functional change intended.

Reviewed-by: Miaohe Lin <linmiaohe@...wei.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
 arch/x86/kvm/vmx/ops.h | 12 +++++-------
 arch/x86/kvm/vmx/vmx.c |  3 +--
 2 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kvm/vmx/ops.h b/arch/x86/kvm/vmx/ops.h
index dd7ab61bfcc1..39122699cfeb 100644
--- a/arch/x86/kvm/vmx/ops.h
+++ b/arch/x86/kvm/vmx/ops.h
@@ -276,17 +276,15 @@ static inline void vpid_sync_context(int vpid)
 		vpid_sync_vcpu_global();
 }
 
-static inline bool vpid_sync_vcpu_addr(int vpid, gva_t addr)
+static inline void vpid_sync_vcpu_addr(int vpid, gva_t addr)
 {
 	if (vpid == 0)
-		return true;
+		return;
 
-	if (cpu_has_vmx_invvpid_individual_addr()) {
+	if (cpu_has_vmx_invvpid_individual_addr())
 		__invvpid(VMX_VPID_EXTENT_INDIVIDUAL_ADDR, vpid, addr);
-		return true;
-	}
-
-	return false;
+	else
+		vpid_sync_context(vpid);
 }
 
 static inline void ept_sync_global(void)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index ba49323a89d8..ba24bbda2c12 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -2853,8 +2853,7 @@ static void vmx_flush_tlb_gva(struct kvm_vcpu *vcpu, gva_t addr)
 {
 	int vpid = to_vmx(vcpu)->vpid;
 
-	if (!vpid_sync_vcpu_addr(vpid, addr))
-		vpid_sync_context(vpid);
+	vpid_sync_vcpu_addr(vpid, addr);
 
 	/*
 	 * If VPIDs are not supported or enabled, then the above is a no-op.
-- 
2.24.1