linux-kernel - [PATCH v2 0/4] KVM: Speed up MMIO registrations

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Message-ID: <20250716110737.2513665-1-keirf@google.com>
Date: Wed, 16 Jul 2025 11:07:33 +0000
From: Keir Fraser <keirf@...gle.com>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	kvm@...r.kernel.org
Cc: Sean Christopherson <seanjc@...gle.com>, Eric Auger <eric.auger@...hat.com>, 
	Oliver Upton <oliver.upton@...ux.dev>, Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>, 
	Paolo Bonzini <pbonzini@...hat.com>, Keir Fraser <keirf@...gle.com>
Subject: [PATCH v2 0/4] KVM: Speed up MMIO registrations

This is version 2 of the patches I previously posted here:

 https://lore.kernel.org/all/20250624092256.1105524-1-keirf@google.com/

Changes since v1:

 * Memory barriers introduced (or implied and documented) on the
   kvm->buses[] SRCU read paths

 * Disallow kvm_get_bus() from SRCU readers

 * Rebased to v6.16-rc6

Thanks to Sean for the review feedback and patch suggestions!

Keir Fraser (4):
  KVM: arm64: vgic-init: Remove vgic_ready() macro
  KVM: arm64: vgic: Explicitly implement vgic_dist::ready ordering
  KVM: Implement barriers before accessing kvm->buses[] on SRCU read
    paths
  KVM: Avoid synchronize_srcu() in kvm_io_bus_register_dev()

 arch/arm64/kvm/vgic/vgic-init.c | 14 +++--------
 arch/x86/kvm/vmx/vmx.c          |  7 ++++++
 include/kvm/arm_vgic.h          |  1 -
 include/linux/kvm_host.h        | 11 ++++++---
 virt/kvm/kvm_main.c             | 43 +++++++++++++++++++++++++++------
 5 files changed, 53 insertions(+), 23 deletions(-)

-- 
2.50.0.727.gbf7dc18ff4-goog