linux-kernel - [PATCH 00/10] KVM: Clean up 'struct page' / pfn helpers

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Date:   Fri, 29 Apr 2022 01:04:06 +0000
From:   Sean Christopherson <seanjc@...gle.com>
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>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 00/10] KVM: Clean up 'struct page' / pfn helpers

Clean up KVM's struct page / pfn helpers to reduce the number of
pfn_to_page() and page_to_pfn() conversions.  E.g. kvm_release_pfn_dirty()
makes 6 (if I counted right) calls to pfn_to_page() when releasing a dirty
pfn that backed by a vanilla struct page.  That is easily trimmed down to
a single call.

And perhaps more importantly, rename and refactor kvm_is_reserved_pfn() to
try and better reflect what it actually queries, which at this point is
effectively whether or not the pfn is backed by a refcounted page.

Sean Christopherson (10):
  KVM: Do not zero initialize 'pfn' in hva_to_pfn()
  KVM: Drop bogus "pfn != 0" guard from kvm_release_pfn()
  KVM: Don't set Accessed/Dirty bits for ZERO_PAGE
  KVM: Avoid pfn_to_page() and vice versa when releasing pages
  KVM: nVMX: Use kvm_vcpu_map() to get/pin vmcs12's APIC-access page
  KVM: Don't WARN if kvm_pfn_to_page() encounters a "reserved" pfn
  KVM: Remove kvm_vcpu_gfn_to_page() and kvm_vcpu_gpa_to_page()
  KVM: Take a 'struct page', not a pfn in kvm_is_zone_device_page()
  KVM: Rename/refactor kvm_is_reserved_pfn() to
    kvm_pfn_to_refcounted_page()
  KVM: x86/mmu: Shove refcounted page dependency into
    host_pfn_mapping_level()

 arch/x86/kvm/mmu/mmu.c     |  26 +++++--
 arch/x86/kvm/mmu/tdp_mmu.c |   3 +-
 arch/x86/kvm/vmx/nested.c  |  39 ++++-------
 arch/x86/kvm/vmx/vmx.h     |   2 +-
 include/linux/kvm_host.h   |  12 +---
 virt/kvm/kvm_main.c        | 140 +++++++++++++++++++++++++------------
 6 files changed, 131 insertions(+), 91 deletions(-)


base-commit: 2a39d8b39bffdaf1a4223d0d22f07baee154c8f3
-- 
2.36.0.464.gb9c8b46e94-goog