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Message-ID: <20240216184153.2714504-1-oliver.upton@linux.dev>
Date: Fri, 16 Feb 2024 18:41:43 +0000
From: Oliver Upton <oliver.upton@...ux.dev>
To: kvmarm@...ts.linux.dev
Cc: kvm@...r.kernel.org,
Marc Zyngier <maz@...nel.org>,
James Morse <james.morse@....com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Zenghui Yu <yuzenghui@...wei.com>,
linux-kernel@...r.kernel.org,
Oliver Upton <oliver.upton@...ux.dev>
Subject: [PATCH v3 00/10] KVM: arm64: Avoid serializing LPI get() / put()
As discussed, here is a slimmed-down series for addressing lock
serialization in the vgic_get_irq() / vgic_put_irq() path for LPIs. The
bulk of it is using an xarray to represent LPIs and leveraging RCU to
avoid serializing readers of the LPI configuration state.
There's a lot of potential for clean-up, but this is intentionally
deferred until after we fix up the LPI translation cache.
v2: https://lore.kernel.org/kvmarm/20240213093250.3960069-1-oliver.upton@linux.dev/
v2 -> v3:
- Fix the stupid lock imbalance once and for all (Dan)
- Drop the tracepoints / stats I used for debugging my own crap (Marc)
Oliver Upton (10):
KVM: arm64: vgic: Store LPIs in an xarray
KVM: arm64: vgic: Use xarray to find LPI in vgic_get_lpi()
KVM: arm64: vgic-v3: Iterate the xarray to find pending LPIs
KVM: arm64: vgic-its: Walk the LPI xarray in vgic_copy_lpi_list()
KVM: arm64: vgic: Get rid of the LPI linked-list
KVM: arm64: vgic: Use atomics to count LPIs
KVM: arm64: vgic: Free LPI vgic_irq structs in an RCU-safe manner
KVM: arm64: vgic: Rely on RCU protection in vgic_get_lpi()
KVM: arm64: vgic: Ensure the irq refcount is nonzero when taking a ref
KVM: arm64: vgic: Don't acquire the lpi_list_lock in vgic_put_irq()
arch/arm64/kvm/vgic/vgic-debug.c | 2 +-
arch/arm64/kvm/vgic/vgic-init.c | 4 ++-
arch/arm64/kvm/vgic/vgic-its.c | 53 +++++++++++++++++++-----------
arch/arm64/kvm/vgic/vgic-v3.c | 3 +-
arch/arm64/kvm/vgic/vgic.c | 56 ++++++++++----------------------
arch/arm64/kvm/vgic/vgic.h | 15 ++++++---
include/kvm/arm_vgic.h | 9 ++---
7 files changed, 73 insertions(+), 69 deletions(-)
base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d
--
2.44.0.rc0.258.g7320e95886-goog
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