[v11,00/19] KVM: xen: update shared_info and vcpu_info handling

From: Paul Durrant <pdurrant@amazon.com>

This series has some small fixes from what was in version 10 [1]:

* KVM: pfncache: allow a cache to be activated with a fixed (userspace) HVA

This required a small fix to kvm_gpc_check() for an error that was
introduced in version 8.

* KVM: xen: separate initialization of shared_info cache and content

This accidentally regressed a fix in commit 5d6d6a7d7e66a ("KVM: x86:
Refine calculation of guest wall clock to use a single TSC read").

* KVM: xen: re-initialize shared_info if guest (32/64-bit) mode is set

This mistakenly removed the initialization of shared_info from the code
setting the KVM_XEN_ATTR_TYPE_SHARED_INFO attribute, which broke the self-
tests.

* KVM: xen: split up kvm_xen_set_evtchn_fast()

This had a /32 and a /64 swapped in set_vcpu_info_evtchn_pending().

[1] https://lore.kernel.org/kvm/20231204144334.910-1-paul@xen.org/

Paul Durrant (19):
  KVM: pfncache: Add a map helper function
  KVM: pfncache: remove unnecessary exports
  KVM: 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: xen: separate initialization of shared_info cache and content
  KVM: xen: re-initialize shared_info if guest (32/64-bit) mode is set
  KVM: xen: allow shared_info to be mapped by fixed HVA
  KVM: xen: allow vcpu_info to be mapped by fixed HVA
  KVM: selftests / xen: map shared_info using HVA rather than GFN
  KVM: selftests / xen: re-map vcpu_info using HVA rather than GPA
  KVM: xen: advertize the KVM_XEN_HVM_CONFIG_SHARED_INFO_HVA capability
  KVM: xen: split up kvm_xen_set_evtchn_fast()
  KVM: 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: xen: allow vcpu_info content to be 'safely' copied

 Documentation/virt/kvm/api.rst                |  53 ++-
 arch/x86/kvm/x86.c                            |   7 +-
 arch/x86/kvm/xen.c                            | 360 +++++++++++-------
 include/linux/kvm_host.h                      |  40 +-
 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                           | 188 ++++-----
 8 files changed, 466 insertions(+), 258 deletions(-)


base-commit: f2a3fb7234e52f72ff4a38364dbf639cf4c7d6c6