Re: [PATCH v13 00/21] KVM: xen: update shared_info and vcpu_info handling

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On Thu, Feb 15, 2024, Paul Durrant wrote:
> David Woodhouse (1):
>   KVM: pfncache: rework __kvm_gpc_refresh() to fix locking issues
> 
> Paul Durrant (19):
>   KVM: pfncache: Add a map helper function
>   KVM: pfncache: remove unnecessary exports
>   KVM: x86/xen: mark guest pages dirty with the pfncache lock held
>   KVM: pfncache: add a mark-dirty helper
>   KVM: pfncache: remove KVM_GUEST_USES_PFN usage
>   KVM: pfncache: stop open-coding offset_in_page()
>   KVM: pfncache: include page offset in uhva and use it consistently
>   KVM: pfncache: allow a cache to be activated with a fixed (userspace)
>     HVA
>   KVM: x86/xen: separate initialization of shared_info cache and content
>   KVM: x86/xen: re-initialize shared_info if guest (32/64-bit) mode is
>     set
>   KVM: x86/xen: allow shared_info to be mapped by fixed HVA
>   KVM: x86/xen: allow vcpu_info to be mapped by fixed HVA
>   KVM: selftests: map Xen's shared_info page using HVA rather than GFN
>   KVM: selftests: re-map Xen's vcpu_info using HVA rather than GPA
>   KVM: x86/xen: advertize the KVM_XEN_HVM_CONFIG_SHARED_INFO_HVA
>     capability
>   KVM: x86/xen: split up kvm_xen_set_evtchn_fast()
>   KVM: x86/xen: don't block on pfncache locks in
>     kvm_xen_set_evtchn_fast()
>   KVM: pfncache: check the need for invalidation under read lock first
>   KVM: x86/xen: allow vcpu_info content to be 'safely' copied
> 
> Sean Christopherson (1):
>   KVM: s390: Refactor kvm_is_error_gpa() into kvm_is_gpa_in_memslot()
> 
>  Documentation/virt/kvm/api.rst                |  53 ++-
>  arch/s390/kvm/diag.c                          |   2 +-
>  arch/s390/kvm/gaccess.c                       |  14 +-
>  arch/s390/kvm/kvm-s390.c                      |   4 +-
>  arch/s390/kvm/priv.c                          |   4 +-
>  arch/s390/kvm/sigp.c                          |   2 +-
>  arch/x86/kvm/x86.c                            |   7 +-
>  arch/x86/kvm/xen.c                            | 361 +++++++++++------
>  include/linux/kvm_host.h                      |  49 ++-
>  include/linux/kvm_types.h                     |   8 -
>  include/uapi/linux/kvm.h                      |   9 +-
>  .../selftests/kvm/x86_64/xen_shinfo_test.c    |  59 ++-
>  virt/kvm/pfncache.c                           | 382 ++++++++++--------
>  13 files changed, 591 insertions(+), 363 deletions(-)

Except for the read_trylock() patch, just a few nits that I can fixup when
applying, though I'll defeinitely want your eyeballs on the end result as they
tweaks aren't _that_ trivial.

Running tests now, if all goes well I'll push to kvm-x86 within the hour. 




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