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From:   lantianyu1986@gmail.com
Cc:     Lan Tianyu <Tianyu.Lan@microsoft.com>, kys@microsoft.com,
        haiyangz@microsoft.com, sthemmin@microsoft.com, tglx@linutronix.de,
        mingo@redhat.com, hpa@zytor.com, x86@kernel.org,
        pbonzini@redhat.com, rkrcmar@redhat.com,
        devel@linuxdriverproject.org, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org, michael.h.kelley@microsoft.com,
        vkuznets@redhat.com
Subject: [PATCH V4 8/15] KVM/MMU: Flush tlb directly in kvm_mmu_zap_collapsible_spte()
Date:   Sat, 13 Oct 2018 22:53:59 +0800
Message-Id: <20181013145406.4911-9-Tianyu.Lan@microsoft.com>
In-Reply-To: <20181013145406.4911-1-Tianyu.Lan@microsoft.com>
References: <20181013145406.4911-1-Tianyu.Lan@microsoft.com>
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From: Lan Tianyu <Tianyu.Lan@microsoft.com>

kvm_mmu_zap_collapsible_spte() returns flush request to the
slot_handle_leaf() and the latter does flush on demand. When
range flush is available, make kvm_mmu_zap_collapsible_spte()
to flush tlb with range directly to avoid returning range back
to slot_handle_leaf().

Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
---
 arch/x86/kvm/mmu.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index c4f7679f12c3..e984a0067a43 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -5743,7 +5743,13 @@ static bool kvm_mmu_zap_collapsible_spte(struct kvm *kvm,
 			!kvm_is_reserved_pfn(pfn) &&
 			PageTransCompoundMap(pfn_to_page(pfn))) {
 			drop_spte(kvm, sptep);
-			need_tlb_flush = 1;
+
+			if (kvm_available_flush_tlb_with_range())
+				kvm_flush_remote_tlbs_with_address(kvm, sp->gfn,
+					KVM_PAGES_PER_HPAGE(sp->role.level));
+			else
+				need_tlb_flush = 1;
+
 			goto restart;
 		}
 	}
-- 
2.14.4