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From:   Tianyu Lan <Tianyu.Lan@microsoft.com>
CC:     Tianyu Lan <Tianyu.Lan@microsoft.com>,
        KY Srinivasan <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        "tglx@linutronix.de" <tglx@linutronix.de>,
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        "devel@linuxdriverproject.org" <devel@linuxdriverproject.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>,
        vkuznets <vkuznets@redhat.com>,
        Jork Loeser <Jork.Loeser@microsoft.com>
Subject: [PATCH V3 5/13] KVM/MMU: Flush tlb directly in the
 kvm_zap_gfn_range()
Thread-Topic: [PATCH V3 5/13] KVM/MMU: Flush tlb directly in the
 kvm_zap_gfn_range()
Thread-Index: AQHUVhUQ4M/Jq/VbY0i+60xtcKOfTg==
Date:   Thu, 27 Sep 2018 03:49:17 +0000
Message-ID: <20180927034829.2230-6-Tianyu.Lan@microsoft.com>
References: <20180927034829.2230-1-Tianyu.Lan@microsoft.com>
In-Reply-To: <20180927034829.2230-1-Tianyu.Lan@microsoft.com>
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Originally, flush tlb is done by slot_handle_level_range(). This patch
is to flush tlb directly in the kvm_zap_gfn_range() when range
flush is available.

Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
---
 arch/x86/kvm/mmu.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 877edae0401f..f24101ef763e 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -5578,6 +5578,7 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_sta=
rt, gfn_t gfn_end)
 {
 	struct kvm_memslots *slots;
 	struct kvm_memory_slot *memslot;
+	bool flush =3D false;
 	int i;
=20
 	spin_lock(&kvm->mmu_lock);
@@ -5585,18 +5586,27 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_s=
tart, gfn_t gfn_end)
 		slots =3D __kvm_memslots(kvm, i);
 		kvm_for_each_memslot(memslot, slots) {
 			gfn_t start, end;
+			bool flush_tlb =3D true;
=20
 			start =3D max(gfn_start, memslot->base_gfn);
 			end =3D min(gfn_end, memslot->base_gfn + memslot->npages);
 			if (start >=3D end)
 				continue;
=20
-			slot_handle_level_range(kvm, memslot, kvm_zap_rmapp,
-						PT_PAGE_TABLE_LEVEL, PT_MAX_HUGEPAGE_LEVEL,
-						start, end - 1, true);
+			if (kvm_available_flush_tlb_with_range())
+				flush_tlb =3D false;
+
+			flush =3D slot_handle_level_range(kvm, memslot,
+					kvm_zap_rmapp, PT_PAGE_TABLE_LEVEL,
+					PT_MAX_HUGEPAGE_LEVEL, start,
+					end - 1, flush_tlb);
 		}
 	}
=20
+	if (flush && kvm_available_flush_tlb_with_range())
+		kvm_flush_remote_tlbs_with_address(kvm, gfn_start,
+				gfn_end - gfn_start + 1);
+
 	spin_unlock(&kvm->mmu_lock);
 }
=20
--=20
2.14.4