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
next prev 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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