From: Lan Tianyu <Tianyu.Lan@microsoft.com>
Date: Thu, 6 Dec 2018 13:21:12 +0000 (+0800)
Subject: KVM/MMU: Flush tlb directly in kvm_set_pte_rmapp()
X-Git-Tag: v5.0-rc1~156^2~10
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=3cc5ea94de5f71dff0d3353f610e729308583e6b;p=linux.git

KVM/MMU: Flush tlb directly in kvm_set_pte_rmapp()

This patch is to flush tlb directly in kvm_set_pte_rmapp()
function when Hyper-V remote TLB flush is available, returning 0
so that kvm_mmu_notifier_change_pte() does not flush again.

Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 5a046f93a41a..fd61d715ebd6 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1776,6 +1776,11 @@ static int kvm_set_pte_rmapp(struct kvm *kvm, struct kvm_rmap_head *rmap_head,
 		}
 	}
 
+	if (need_flush && kvm_available_flush_tlb_with_range()) {
+		kvm_flush_remote_tlbs_with_address(kvm, gfn, 1);
+		return 0;
+	}
+
 	return need_flush;
 }