linux-kernel - [PATCH v2 0/4] KVM: extract lock_all_vcpus/unlock_all

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Message-Id: <20250409014136.2816971-1-mlevitsk@redhat.com>
Date: Tue,  8 Apr 2025 21:41:32 -0400
From: Maxim Levitsky <mlevitsk@...hat.com>
To: kvm@...r.kernel.org
Cc: Alexander Potapenko <glider@...gle.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	kvm-riscv@...ts.infradead.org,
	Oliver Upton <oliver.upton@...ux.dev>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Jing Zhang <jingzhangos@...gle.com>,
	Waiman Long <longman@...hat.com>,
	x86@...nel.org,
	Kunkun Jiang <jiangkunkun@...wei.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Anup Patel <anup@...infault.org>,
	Albert Ou <aou@...s.berkeley.edu>,
	kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Zenghui Yu <yuzenghui@...wei.com>,
	Borislav Petkov <bp@...en8.de>,
	Alexandre Ghiti <alex@...ti.fr>,
	Keisuke Nishimura <keisuke.nishimura@...ia.fr>,
	Sebastian Ott <sebott@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Atish Patra <atishp@...shpatra.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Will Deacon <will@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	linux-riscv@...ts.infradead.org,
	Marc Zyngier <maz@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	Joey Gouly <joey.gouly@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Andre Przywara <andre.przywara@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sean Christopherson <seanjc@...gle.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Maxim Levitsky <mlevitsk@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH v2 0/4] KVM: extract lock_all_vcpus/unlock_all_vcpus

Implement Paolo's suggestion of reusing
sev_lock/unlock_vcpus_for_migration in arm and riscv code
for the purpose of taking vcpu->mutex of all vcpus of a VM.

Because sev_lock/unlock_vcpus_for_migration already have a workaround
for lockdep max lock depth, this fixes the lockdep warnings on arm
which were the inspiration for this refactoring.

This patch series was only compile tested on all 3 architectures.

V2: added trylock option to kvm_lock_all_vcpus to be better compatible
with the orginal code.

Best regards,
	Maxim Levitsky

Maxim Levitsky (4):
  locking/mutex: implement mutex_trylock_nested
  KVM: x86: move sev_lock/unlock_vcpus_for_migration to kvm_main.c
  KVM: arm64: switch to using kvm_lock/unlock_all_vcpus
  RISC-V: KVM: switch to kvm_lock/unlock_all_vcpus

 arch/arm64/include/asm/kvm_host.h     |  3 --
 arch/arm64/kvm/arch_timer.c           |  4 +-
 arch/arm64/kvm/arm.c                  | 43 ----------------
 arch/arm64/kvm/vgic/vgic-init.c       |  4 +-
 arch/arm64/kvm/vgic/vgic-its.c        |  8 +--
 arch/arm64/kvm/vgic/vgic-kvm-device.c | 12 ++---
 arch/riscv/kvm/aia_device.c           | 34 +------------
 arch/x86/kvm/svm/sev.c                | 65 ++----------------------
 include/linux/kvm_host.h              |  6 +++
 include/linux/mutex.h                 |  8 +++
 kernel/locking/mutex.c                | 14 ++++--
 virt/kvm/kvm_main.c                   | 71 +++++++++++++++++++++++++++
 12 files changed, 116 insertions(+), 156 deletions(-)

-- 
2.26.3