linux-kernel - [PATCH 2/2] TESTING! KVM: x86: add invalidate

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Date:   Thu, 30 Nov 2017 19:05:46 +0100
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Fabian Grünbichler <f.gruenbichler@...xmox.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Jérôme Glisse <jglisse@...hat.com>
Subject: [PATCH 2/2] TESTING! KVM: x86: add invalidate_range mmu notifier

Does roughly what kvm_mmu_notifier_invalidate_page did before.

I am not certain why this would be needed.  It might mean that we have
another bug with start/end or just that I missed something.

Please try just [1/2] first and apply this one only if [1/2] still bugs,
thanks!
---
 virt/kvm/kvm_main.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index b7f4689e373f..0825ea624f16 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -342,6 +342,29 @@ static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
 	srcu_read_unlock(&kvm->srcu, idx);
 }
 
+static void kvm_mmu_notifier_invalidate_range(struct mmu_notifier *mn,
+						    struct mm_struct *mm,
+						    unsigned long start,
+						    unsigned long end)
+{
+	struct kvm *kvm = mmu_notifier_to_kvm(mn);
+	int need_tlb_flush = 0, idx;
+
+	idx = srcu_read_lock(&kvm->srcu);
+	spin_lock(&kvm->mmu_lock);
+	kvm->mmu_notifier_seq++;
+	need_tlb_flush = kvm_unmap_hva_range(kvm, start, end);
+	need_tlb_flush |= kvm->tlbs_dirty;
+	if (need_tlb_flush)
+		kvm_flush_remote_tlbs(kvm);
+
+	spin_unlock(&kvm->mmu_lock);
+
+	kvm_arch_mmu_notifier_invalidate_range(kvm, start, end);
+
+	srcu_read_unlock(&kvm->srcu, idx);
+}
+
 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
 						    struct mm_struct *mm,
 						    unsigned long start,
@@ -476,6 +499,7 @@ static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
 }
 
 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
+	.invalidate_range	= kvm_mmu_notifier_invalidate_range,
 	.invalidate_range_start	= kvm_mmu_notifier_invalidate_range_start,
 	.invalidate_range_end	= kvm_mmu_notifier_invalidate_range_end,
 	.clear_flush_young	= kvm_mmu_notifier_clear_flush_young,
-- 
2.14.2