linux-kernel - [PATCH v3 00/11] RFC: nested AVIC

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Message-Id: <20220301182639.559568-1-mlevitsk@redhat.com>
Date:   Tue,  1 Mar 2022 20:26:28 +0200
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        x86@...nel.org, intel-gvt-dev@...ts.freedesktop.org,
        Joerg Roedel <joro@...tes.org>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
        Jim Mattson <jmattson@...gle.com>,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        dri-devel@...ts.freedesktop.org,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH v3 00/11] RFC: nested AVIC

This patch series implement everything that is needed to
use AMD's AVIC while a nested guest is running including
ability of the nested guest to use it, and brings feature
parity vs APICv.

I already posted patch 2, and patch 1 is extracted from another
patch I posted today ‘KVM: x86: nSVM: implement nested VMLOAD/VMSAVE’
To make this series not depend on anything.

This is RFC. There still corner cases that need to be fixed in regard to locking,
especially around RCU use, locking is IMHO a bit ugly and inefficient.

I did test this with nested guests (even 3 level of nesting, all with AVIC enabled),
I also did a light test with VFIO passthrough.

Suggestions, comments are welcome.

Best regards,
	Maxim Levitsky

Maxim Levitsky (11):
  KVM: x86: SVM: move nested_npt_enabled to svm.h
  KVM: x86: SVM: allow AVIC to co-exist with a nested guest running
  KVM: x86: mmu: allow to enable write tracking externally
  x86: KVMGT: use kvm_page_track_write_tracking_enable
  KVM: x86: mmu: add gfn_in_memslot helper
  KVM: x86: lapic: don't allow to change APIC ID when apic acceleration
    is enabled
  KVM: x86: SVM: remove avic's broken code that updated APIC ID
  KVM: x86: SVM: move avic state to separate struct
  KVM: x86: rename .set_apic_access_page_addr to reload_apic_access_page
  KVM: nSVM: implement support for nested AVIC
  KVM: SVM: allow to avoid not needed updates to is_running

 arch/x86/include/asm/kvm-x86-ops.h    |   3 +-
 arch/x86/include/asm/kvm_host.h       |  12 +-
 arch/x86/include/asm/kvm_page_track.h |   1 +
 arch/x86/include/asm/svm.h            |   8 +-
 arch/x86/kvm/Kconfig                  |   3 -
 arch/x86/kvm/lapic.c                  |  28 +-
 arch/x86/kvm/mmu.h                    |   8 +-
 arch/x86/kvm/mmu/mmu.c                |  16 +-
 arch/x86/kvm/mmu/page_track.c         |  10 +-
 arch/x86/kvm/svm/avic.c               | 763 +++++++++++++++++++++++---
 arch/x86/kvm/svm/nested.c             | 147 ++++-
 arch/x86/kvm/svm/svm.c                |  61 +-
 arch/x86/kvm/svm/svm.h                | 158 +++++-
 arch/x86/kvm/trace.h                  | 164 +++++-
 arch/x86/kvm/vmx/vmx.c                |   8 +-
 arch/x86/kvm/x86.c                    |  31 +-
 drivers/gpu/drm/i915/Kconfig          |   1 -
 drivers/gpu/drm/i915/gvt/kvmgt.c      |   5 +
 include/linux/kvm_host.h              |  10 +-
 virt/kvm/kvm_main.c                   |   3 +-
 20 files changed, 1298 insertions(+), 142 deletions(-)

-- 
2.26.3