linux-kernel - [PATCH 0/3] KVM: Scalable memslots implementation additional patches

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Message-Id: <cover.1637884349.git.maciej.szmigiero@oracle.com>
Date:   Fri, 26 Nov 2021 01:31:06 +0100
From:   "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Igor Mammedov <imammedo@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] KVM: Scalable memslots implementation additional patches

From: "Maciej S. Szmigiero" <maciej.szmigiero@...cle.com>

While the last "5.5" version of KVM scalable memslots implementation was
merged to kvm/queue some changes from its review round are still pending.

This series contains these changes which still apply to the final form of
the code.

The changes include switching kvm_for_each_memslot_in_gfn_range() to use
iterators.
However, I've dropped kvm_for_each_memslot_in_hva_range() rework to
use dedicated iterators since the existing implementation was already
returning only strictly overlapping memslots and it was already using
interval tree iterators.
The code there is also self-contained and very simple.

The code was tested on x86 with KASAN on and booted various guests
successfully (including nested ones; with TDP MMU both enabled and disabled).

There were some VMX APICv warnings during these tests but these look
related to the latest VMX PI changes rather than memslots handling code.

 arch/x86/include/asm/kvm_host.h |   2 +-
 arch/x86/kvm/mmu/mmu.c          |  11 ++--
 arch/x86/kvm/x86.c              |   3 +-
 include/linux/kvm_host.h        | 104 ++++++++++++++++++++------------
 virt/kvm/kvm_main.c             |  25 +++-----
 5 files changed, 83 insertions(+), 62 deletions(-)