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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 6/7] KVM: arm/arm64: Elide CMOs when retrying a block mapping
Date: Fri, 13 Dec 2019 18:25:02 +0000	[thread overview]
Message-ID: <20191213182503.14460-7-maz@kernel.org> (raw)
In-Reply-To: <20191213182503.14460-1-maz@kernel.org>

In the rare cases where we're converting a table mapping in
a block mapping, there is no point in cleaning memory to the
PoC, as we're about to remap the exact same pages again,
only as a block mapping.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 virt/kvm/arm/mmu.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index d7c710491d26..c55022dbac89 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -1109,7 +1109,8 @@ static int stage2_set_pmd_huge(struct kvm *kvm, struct kvm_mmu_memory_cache
 		 * get handled accordingly.
 		 */
 		if (!pmd_thp_or_huge(old_pmd)) {
-			unmap_stage2_range(kvm, addr & S2_PMD_MASK, S2_PMD_SIZE, 0);
+			unmap_stage2_range(kvm, addr & S2_PMD_MASK, S2_PMD_SIZE,
+					   KVM_UNMAP_ELIDE_CMO);
 			goto retry;
 		}
 		/*
@@ -1159,7 +1160,8 @@ static int stage2_set_pud_huge(struct kvm *kvm, struct kvm_mmu_memory_cache *cac
 		 * the range for this block and retry.
 		 */
 		if (!stage2_pud_huge(kvm, old_pud)) {
-			unmap_stage2_range(kvm, addr & S2_PUD_MASK, S2_PUD_SIZE, 0);
+			unmap_stage2_range(kvm, addr & S2_PUD_MASK, S2_PUD_SIZE,
+					   KVM_UNMAP_ELIDE_CMO);
 			goto retry;
 		}
 
-- 
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 ` [PATCH 5/7] KVM: arm/arm64: Elide both CMOs and TBLIs on freeing the whole Stage-2 Marc Zyngier
2019-12-13 18:25 ` Marc Zyngier [this message]
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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