From: Marc Zyngier <maz@kernel.org>
To: kvm@vger.kernel.org, linux-mips@vger.kernel.org,
kvmarm@lists.cs.columbia.edu, linuxppc-dev@lists.ozlabs.org
Cc: Juergen Gross <jgross@suse.com>,
Huacai Chen <chenhuacai@kernel.org>,
Janosch Frank <frankja@linux.ibm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Sean Christopherson <seanjc@google.com>,
Anup Patel <anup.patel@wdc.com>,
David Hildenbrand <david@redhat.com>,
Nicholas Piggin <npiggin@gmail.com>,
Atish Patra <atish.patra@wdc.com>,
Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>,
Paul Mackerras <paulus@samba.org>,
James Morse <james.morse@arm.com>,
Paolo Bonzini <pbonzini@redhat.com>,
kernel-team@android.com,
Claudio Imbrenda <imbrenda@linux.ibm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH 0/5] KVM: Turn the vcpu array into an xarray
Date: Fri, 5 Nov 2021 19:20:56 +0000 [thread overview]
Message-ID: <20211105192101.3862492-1-maz@kernel.org> (raw)
The kvm structure is pretty large. A large portion of it is the vcpu
array, which is 4kB on x86_64 and arm64 as they deal with 512 vcpu
VMs. Of course, hardly anyone runs VMs this big, so this is often a
net waste of memory and cache locality.
A possible approach is to turn the fixed-size array into an xarray,
which results in a net code deletion after a bit of cleanup.
This series is on top of the current linux/master as it touches the
RISC-V implementation. Only tested on arm64.
Marc Zyngier (5):
KVM: Move wiping of the kvm->vcpus array to common code
KVM: mips: Use kvm_get_vcpu() instead of open-coded access
KVM: s390: Use kvm_get_vcpu() instead of open-coded access
KVM: x86: Use kvm_get_vcpu() instead of open-coded access
KVM: Convert the kvm->vcpus array to a xarray
arch/arm64/kvm/arm.c | 10 +---------
arch/mips/kvm/loongson_ipi.c | 4 ++--
arch/mips/kvm/mips.c | 23 ++---------------------
arch/powerpc/kvm/powerpc.c | 10 +---------
arch/riscv/kvm/vm.c | 10 +---------
arch/s390/kvm/kvm-s390.c | 26 ++++++--------------------
arch/x86/kvm/vmx/posted_intr.c | 2 +-
arch/x86/kvm/x86.c | 9 +--------
include/linux/kvm_host.h | 7 ++++---
virt/kvm/kvm_main.c | 33 ++++++++++++++++++++++++++-------
10 files changed, 45 insertions(+), 89 deletions(-)
--
2.30.2
next reply other threads:[~2021-11-05 19:22 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-05 19:20 Marc Zyngier [this message]
2021-11-05 19:20 ` [PATCH 1/5] KVM: Move wiping of the kvm->vcpus array to common code Marc Zyngier
2021-11-05 20:12 ` Sean Christopherson
2021-11-06 11:17 ` Marc Zyngier
2021-11-16 13:49 ` Paolo Bonzini
2021-11-08 12:12 ` Claudio Imbrenda
2021-11-05 19:20 ` [PATCH 2/5] KVM: mips: Use kvm_get_vcpu() instead of open-coded access Marc Zyngier
2021-11-06 15:56 ` Philippe Mathieu-Daudé
2021-11-05 19:20 ` [PATCH 3/5] KVM: s390: " Marc Zyngier
2021-11-08 12:13 ` Claudio Imbrenda
2021-11-05 19:21 ` [PATCH 4/5] KVM: x86: " Marc Zyngier
2021-11-05 20:03 ` Sean Christopherson
2021-11-16 14:04 ` Paolo Bonzini
2021-11-16 16:07 ` Sean Christopherson
2021-11-16 16:48 ` Paolo Bonzini
2021-11-05 19:21 ` [PATCH 5/5] KVM: Convert the kvm->vcpus array to a xarray Marc Zyngier
2021-11-05 20:21 ` Sean Christopherson
2021-11-06 11:48 ` Marc Zyngier
2021-11-08 8:23 ` Marc Zyngier
2021-11-16 14:13 ` [PATCH 0/5] KVM: Turn the vcpu array into an xarray Juergen Gross
2021-11-16 14:21 ` Paolo Bonzini
2021-11-16 14:54 ` Juergen Gross
2021-11-16 15:03 ` Paolo Bonzini
2021-11-16 15:40 ` Marc Zyngier
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