linux-kernel - [PATCH 00/16] KVM: x86: pass arguments on the page fault path via struct kvm_page

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Message-Id: <20210807134936.3083984-1-pbonzini@redhat.com>
Date:   Sat,  7 Aug 2021 09:49:20 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     isaku.yamahata@...el.com, David Matlack <dmatlack@...gle.com>,
        seanjc@...gle.com, peterx@...hat.com
Subject: [PATCH 00/16] KVM: x86: pass arguments on the page fault path via struct kvm_page_fault

This is a revival of Isaku's patches from
https://lore.kernel.org/kvm/cover.1618914692.git.isaku.yamahata@intel.com/.
The current kvm page fault handlers passes around many arguments to the
functions.  To simplify those arguments and local variables, introduce
a data structure, struct kvm_page_fault, to hold those arguments and
variables.  struct kvm_page_fault is allocated on stack on the caller
of kvm fault handler, kvm_mmu_do_page_fault(), and passed around.

The patches were redone from scratch based on the suggested struct layout
from the review (https://lore.kernel.org/kvm/YK65V++S2Kt1OLTu@google.com/)
and the subjects of Isaku's patches, so I kept authorship for myself
and gave him a "Suggested-by" tag.

The first two steps are unrelated cleanups that come in handy later on.

Paolo

Paolo Bonzini (16):
  KVM: MMU: pass unadulterated gpa to direct_page_fault
  KVM: x86: clamp host mapping level to max_level in
    kvm_mmu_max_mapping_level
  KVM: MMU: Introduce struct kvm_page_fault
  KVM: MMU: change mmu->page_fault() arguments to kvm_page_fault
  KVM: MMU: change direct_page_fault() arguments to kvm_page_fault
  KVM: MMU: change page_fault_handle_page_track() arguments to
    kvm_page_fault
  KVM: MMU: change try_async_pf() arguments to kvm_page_fault
  KVM: MMU: change handle_abnormal_pfn() arguments to kvm_page_fault
  KVM: MMU: change __direct_map() arguments to kvm_page_fault
  KVM: MMU: change FNAME(fetch)() arguments to kvm_page_fault
  KVM: MMU: change kvm_tdp_mmu_map() arguments to kvm_page_fault
  KVM: MMU: change tdp_mmu_map_handle_target_level() arguments to
    kvm_page_fault
  KVM: MMU: change fast_page_fault() arguments to kvm_page_fault
  KVM: MMU: change kvm_mmu_hugepage_adjust() arguments to kvm_page_fault
  KVM: MMU: change disallowed_hugepage_adjust() arguments to
    kvm_page_fault
  KVM: MMU: change tracepoints arguments to kvm_page_fault

 arch/x86/include/asm/kvm_host.h |   4 +-
 arch/x86/kvm/mmu.h              |  81 ++++++++++-
 arch/x86/kvm/mmu/mmu.c          | 241 ++++++++++++++------------------
 arch/x86/kvm/mmu/mmu_internal.h |  13 +-
 arch/x86/kvm/mmu/mmutrace.h     |  18 +--
 arch/x86/kvm/mmu/paging_tmpl.h  |  96 ++++++-------
 arch/x86/kvm/mmu/tdp_mmu.c      |  49 +++----
 arch/x86/kvm/mmu/tdp_mmu.h      |   4 +-
 8 files changed, 253 insertions(+), 253 deletions(-)

-- 
2.27.0