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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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        "rkrcmar@redhat.com" <rkrcmar@redhat.com>,
        "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 2/13] KVM/MMU: Add tlb flush with range helper function
Thread-Topic: [PATCH V3 2/13] KVM/MMU: Add tlb flush with range helper
 function
Thread-Index: AQHUVhUECOP6CEvTFUiTgVF4Ld5WEg==
Date:   Thu, 27 Sep 2018 03:48:57 +0000
Message-ID: <20180927034829.2230-3-Tianyu.Lan@microsoft.com>
References: <20180927034829.2230-1-Tianyu.Lan@microsoft.com>
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This patch is to add wrapper functions for tlb_remote_flush_with_range
callback.

Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
---
Change since V2:
       Fix comment in the kvm_flush_remote_tlbs_with_range()
---
 arch/x86/kvm/mmu.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index c67f09086378..18cac661a41a 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -253,6 +253,54 @@ static void mmu_spte_set(u64 *sptep, u64 spte);
 static union kvm_mmu_page_role
 kvm_mmu_calc_root_page_role(struct kvm_vcpu *vcpu);
=20
+
+static inline bool kvm_available_flush_tlb_with_range(void)
+{
+	return kvm_x86_ops->tlb_remote_flush_with_range;
+}
+
+static void kvm_flush_remote_tlbs_with_range(struct kvm *kvm,
+		struct kvm_tlb_range *range)
+{
+	int ret =3D -ENOTSUPP;
+
+	if (range && kvm_x86_ops->tlb_remote_flush_with_range) {
+		/*
+		 * Read tlbs_dirty before flushing tlbs in order
+		 * to track dirty tlbs during flushing.
+		 */
+		long dirty_count =3D smp_load_acquire(&kvm->tlbs_dirty);
+
+		ret =3D kvm_x86_ops->tlb_remote_flush_with_range(kvm, range);
+		cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
+	}
+
+	if (ret)
+		kvm_flush_remote_tlbs(kvm);
+}
+
+static void kvm_flush_remote_tlbs_with_list(struct kvm *kvm,
+		struct list_head *flush_list)
+{
+	struct kvm_tlb_range range;
+
+	range.flush_list =3D flush_list;
+
+	kvm_flush_remote_tlbs_with_range(kvm, &range);
+}
+
+static void kvm_flush_remote_tlbs_with_address(struct kvm *kvm,
+		u64 start_gfn, u64 pages)
+{
+	struct kvm_tlb_range range;
+
+	range.start_gfn =3D start_gfn;
+	range.pages =3D pages;
+	range.flush_list =3D NULL;
+
+	kvm_flush_remote_tlbs_with_range(kvm, &range);
+}
+
 void kvm_mmu_set_mmio_spte_mask(u64 mmio_mask, u64 mmio_value)
 {
 	BUG_ON((mmio_mask & mmio_value) !=3D mmio_value);
--=20
2.14.4