linux-kernel - [PATCH 0/3] KVM: Speed up MMIO registrations

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250624092256.1105524-1-keirf@google.com>
Date: Tue, 24 Jun 2025 09:22:52 +0000
From: Keir Fraser <keirf@...gle.com>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	kvm@...r.kernel.org
Cc: 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 0/3] KVM: Speed up MMIO registrations

This series improves performance of MMIO registrations, which occur
multiple times when booting a typical VM. The existing call to
synchronize_srcu() may block for a considerable time: In our tests
it was found to account for approximately 25% of a VM's startup time.

arm64 vgic code is cleaned up and made responsible for
its own setup synchronization, and the MMIO registration logic
replaces synchronize_srcu() with a deferred callback to free the old
io_bus struct.

Keir Fraser (3):
  KVM: arm64: vgic-init: Remove vgic_ready() macro
  KVM: arm64: vgic: Explicitly implement vgic_dist::ready ordering
  KVM: Avoid synchronize_srcu() in kvm_io_bus_register_dev()

 arch/arm64/kvm/vgic/vgic-init.c | 14 +++-----------
 include/kvm/arm_vgic.h          |  1 -
 include/linux/kvm_host.h        |  1 +
 virt/kvm/kvm_main.c             | 10 ++++++++--
 4 files changed, 12 insertions(+), 14 deletions(-)

-- 
2.50.0.rc2.761.g2dc52ea45b-goog