linux-kernel - [PATCH V2 4/13] KVM/MMU: Flush tlb directly in the kvm_handle_hva

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Message-ID: <20180918031754.113013-5-Tianyu.Lan@microsoft.com>
Date:   Tue, 18 Sep 2018 03:18:36 +0000
From:   Tianyu Lan <Tianyu.Lan@...rosoft.com>
To:     unlisted-recipients:; (no To-header on input)
CC:     Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>,
        vkuznets <vkuznets@...hat.com>,
        Jork Loeser <Jork.Loeser@...rosoft.com>
Subject: [PATCH V2 4/13] KVM/MMU: Flush tlb directly in the
 kvm_handle_hva_range()

This patch is to flush tlb directly in the kvm_handle_hva_range()
when range flush is available.

Signed-off-by: Lan Tianyu <Tianyu.Lan@...rosoft.com>
---
 arch/x86/kvm/mmu.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 822e170881a4..dfd2a0710417 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1888,6 +1888,13 @@ static int kvm_handle_hva_range(struct kvm *kvm,
 						 &iterator)
 				ret |= handler(kvm, iterator.rmap, memslot,
 					       iterator.gfn, iterator.level, data);
+
+			if (ret && kvm_available_flush_tlb_with_range()) {
+				kvm_flush_remote_tlbs_with_address(kvm,
+						gfn_start,
+						gfn_end - gfn_start);
+				ret = 0;
+			}
 		}
 	}
 
-- 
2.14.4