linux-kernel - [PATCH 0/3] KVM: x86: replace kvm_vcpu

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Date:   Fri, 27 Jan 2023 13:44:57 +0900
From:   David Stevens <stevensd@...omium.org>
To:     Sean Christopherson <seanjc@...gle.com>,
        David Woodhouse <dwmw@...zon.co.uk>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        David Stevens <stevensd@...omium.org>
Subject: [PATCH 0/3] KVM: x86: replace kvm_vcpu_map usage in vmx

From: David Stevens <stevensd@...omium.org>

This series replaces the usage of kvm_vcpu_map in vmx with
gfn_to_pfn_cache. See [1] for details on why kvm_vcpu_map is broken.

The presence of kvm_vcpu_map blocks another series I would like to
try to merge [2]. Although I'm not familiar with the internals of vmx,
I've gone ahead and taken a stab at this cleanup. I've done some manual
testing with nested VMs, and KVM selftests pass, but thorough feedback
would be appreciated. Once this cleanup is done, I'll take a look at
removing kvm_vcpu_map from svm.

[1] https://lore.kernel.org/all/20211115165030.7422-8-dwmw2@infradead.org/
[2] https://lore.kernel.org/all/Ydhq5aHW+JFo15UF@google.com/

David Stevens (3):
  KVM: Support sharing gpc locks
  KVM: use gfn=>pfn cache in nested_get_vmcs12_pages
  KVM: use gfn=>pfn cache for evmcs

 arch/x86/kvm/vmx/hyperv.c |  41 ++++-
 arch/x86/kvm/vmx/hyperv.h |   2 +
 arch/x86/kvm/vmx/nested.c | 329 +++++++++++++++++++++++++++++---------
 arch/x86/kvm/vmx/vmx.c    |  48 +++++-
 arch/x86/kvm/vmx/vmx.h    |  14 +-
 arch/x86/kvm/x86.c        |   8 +-
 arch/x86/kvm/xen.c        |  58 +++----
 include/linux/kvm_host.h  |  12 ++
 include/linux/kvm_types.h |   3 +-
 virt/kvm/pfncache.c       |  37 +++--
 10 files changed, 418 insertions(+), 134 deletions(-)

-- 
2.39.1.456.gfc5497dd1b-goog