linux-kernel - [PATCH v3 0/2] KVM: SVM: Create separate vmcbs for L1 and L2

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Date:   Mon, 26 Oct 2020 13:42:20 -0400
From:   Cathy Avery <cavery@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        pbonzini@...hat.com
Cc:     vkuznets@...hat.com, wei.huang2@....com, mlevitsk@...hat.com,
        sean.j.christopherson@...el.com
Subject: [PATCH v3 0/2] KVM: SVM: Create separate vmcbs for L1 and L2

svm->vmcb will now point to either a separate vmcb L1 ( not nested ) or L2 vmcb ( nested ).

Changes:
v2 -> v3
 - Added vmcb switching helper.
 - svm_set_nested_state always forces to L1 before determining state
   to set. This is more like vmx and covers any potential L2 to L2 nested state switch.
 - Moved svm->asid tracking to pre_svm_run and added ASID set dirty bit
   checking.

v1 -> v2
 - Removed unnecessary update check of L1 save.cr3 during nested_svm_vmexit.
 - Moved vmcb01_pa to svm.
 - Removed get_host_vmcb() function.
 - Updated vmsave/vmload corresponding vmcb state during L2
   enter and exit which fixed the L2 load issue.
 - Moved asid workaround to a new patch which adds asid to svm.
 - Init previously uninitialized L2 vmcb save.gpat and save.cr4

Tested:
kvm-unit-tests
kvm self tests
Loaded fedora nested guest on fedora

Cathy Avery (2):
  KVM: SVM: Track asid from vcpu_svm
  KVM: SVM: Use a separate vmcb for the nested L2 guest

 arch/x86/kvm/svm/nested.c | 125 ++++++++++++++++++--------------------
 arch/x86/kvm/svm/svm.c    |  58 +++++++++++-------
 arch/x86/kvm/svm/svm.h    |  51 +++++-----------
 3 files changed, 110 insertions(+), 124 deletions(-)

-- 
2.20.1