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From: Marc Zyngier <maz@kernel.org>
To: unlisted-recipients:; (no To-header on input)
Cc: "James Morse" <james.morse@arm.com>,
	"Julien Thierry" <julien.thierry.kdev@gmail.com>,
	"Suzuki K Poulose" <suzuki.poulose@arm.com>,
	"James Hogan" <jhogan@kernel.org>,
	"Paul Mackerras" <paulus@ozlabs.org>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	"Sean Christopherson" <sean.j.christopherson@intel.com>,
	"Vitaly Kuznetsov" <vkuznets@redhat.com>,
	"Wanpeng Li" <wanpengli@tencent.com>,
	"Jim Mattson" <jmattson@google.com>,
	"Joerg Roedel" <joro@8bytes.org>,
	linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org,
	kvm-ppc@vger.kernel.org, kvm@vger.kernel.org
Subject: [PATCH 5/7] KVM: arm/arm64: Elide both CMOs and TBLIs on freeing the whole Stage-2
Date: Fri, 13 Dec 2019 18:25:01 +0000	[thread overview]
Message-ID: <20191213182503.14460-6-maz@kernel.org> (raw)
In-Reply-To: <20191213182503.14460-1-maz@kernel.org>

When freeing the whole of a VM's Stage-2 page tables, there is
little point in doing cache maintenance on each and every page
(the guest won't be running anymore, let alone having its MMU
off). As for TLBs, there is no point in invalidating individual
pages, as we can replace the whole thing with a VMALL operation,
which invalidates all the TLBs for this VM in one go.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 virt/kvm/arm/mmu.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index 4399866842dc..d7c710491d26 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -1016,10 +1016,13 @@ void kvm_free_stage2_pgd(struct kvm *kvm)
 
 	spin_lock(&kvm->mmu_lock);
 	if (kvm->arch.pgd) {
-		unmap_stage2_range(kvm, 0, kvm_phys_size(kvm), 0);
+		unmap_stage2_range(kvm, 0, kvm_phys_size(kvm),
+				   KVM_UNMAP_ELIDE_CMO | KVM_UNMAP_ELIDE_TBLI);
 		pgd = READ_ONCE(kvm->arch.pgd);
 		kvm->arch.pgd = NULL;
 		kvm->arch.pgd_phys = 0;
+
+		kvm_flush_remote_tlbs(kvm);
 	}
 	spin_unlock(&kvm->mmu_lock);
 
-- 
2.20.1


  parent reply	other threads:[~2019-12-13 20:40 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-13 18:24 [PATCH 0/7] KVM: arm/arm64: Help VMs dying quicker Marc Zyngier
2019-12-13 18:24 ` [PATCH 1/7] KVM: Pass mmu_notifier_range down to kvm_unmap_hva_range() Marc Zyngier
2019-12-13 18:59   ` Suzuki Kuruppassery Poulose
2019-12-14 10:37     ` Marc Zyngier
2019-12-15 10:27   ` Marc Zyngier
2020-01-15 18:10   ` Paolo Bonzini
2019-12-13 18:24 ` [PATCH 2/7] KVM: arm/arm64: Pass flags along Stage-2 unmapping functions Marc Zyngier
2019-12-13 18:24 ` [PATCH 3/7] KVM: arm/arm64: Condition cache maintenance on unmap with a flag Marc Zyngier
2019-12-13 18:25 ` [PATCH 4/7] KVM: arm/arm64: Condition TLB " Marc Zyngier
2019-12-13 18:25 ` Marc Zyngier [this message]
2019-12-13 18:25 ` [PATCH 6/7] KVM: arm/arm64: Elide CMOs when retrying a block mapping Marc Zyngier
2019-12-13 18:25 ` [PATCH 7/7] KVM: arm/arm64: Elide CMOs when unmapping a range Marc Zyngier
2019-12-18 15:07   ` James Morse
2019-12-18 15:30     ` Marc Zyngier
2019-12-19 13:46       ` James Morse

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