linux-kernel - [PATCH 0/4] Improve dirty ring warning report

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Message-Id: <20230116040405.260935-1-gshan@redhat.com>
Date:   Mon, 16 Jan 2023 12:04:01 +0800
From:   Gavin Shan <gshan@...hat.com>
To:     kvmarm@...ts.linux.dev
Cc:     kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, pbonzini@...hat.com, maz@...nel.org,
        corbet@....net, james.morse@....com, suzuki.poulose@....com,
        oliver.upton@...ux.dev, yuzenghui@...wei.com,
        catalin.marinas@....com, will@...nel.org, ricarkol@...gle.com,
        eric.auger@...hat.com, yuzhe@...china.com, renzhengeek@...il.com,
        ardb@...nel.org, peterx@...hat.com, seanjc@...gle.com,
        shan.gavin@...il.com
Subject: [PATCH 0/4] Improve dirty ring warning report

It has been known case where no running VCPU context exists when the
vgic/its tables are saved. There are other two unknown cases where we
don't have the running VCPU context: (a) saving vgic3 LPI pending status
and (b) saving vgic3 pending tables. Besides, the warning reports in
mark_page_dirty_in_slot() is triggered even the dirty ring hasn't been
enabled by the user space. It's not the unexpected behaviour.

PATCH[1 - 2] Fixes the no-running VCPU context issue when vgic3 LPI
             and vgic3 pending table are saved.
PATCH[3 - 4] Improve the warning reports by enabling them when the
             dirty ring has been enabled by the user space.

Gavin Shan (4):
  KVM: arm64: Allow saving vgic3 LPI pending status in no running vcpu
    context
  KVM: arm64: Allow saving vgic3 pending tables in no running vcpu
    context
  KVM: Refactor mark_page_dirty_in_slot()
  KVM: Improve warning report in mark_page_dirty_in_slot()

 Documentation/virt/kvm/api.rst |  8 ++++++--
 arch/arm64/kvm/vgic/vgic-its.c |  3 ++-
 arch/arm64/kvm/vgic/vgic-v3.c  |  5 +++++
 include/kvm/arm_vgic.h         |  1 +
 include/linux/kvm_dirty_ring.h |  5 +++++
 virt/kvm/kvm_main.c            | 30 ++++++++++++++++++------------
 6 files changed, 37 insertions(+), 15 deletions(-)

-- 
2.23.0