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

Paul Durrant
2024-02-15T15:41:14Z

From: Paul Durrant <pdurrant@amazon.com>

This series contains a new patch from Sean added since v12 [1]:

* KVM: s390: Refactor kvm_is_error_gpa() into kvm_is_gpa_in_memslot()

This frees up the function name kvm_is_error_gpa() such that it can then be
re-defined in:

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

to be used for a simple GPA validation helper function. The patch also now
contains an either/or address check for GPA versus HVA in
__kvm_gpc_refresh().

In:

* KVM: pfncache: add a mark-dirty helper

The function name has been changed from kvm_gpc_mark_dirty() to
kvm_gpc_mark_dirty_in_slot().

In:

* KVM: x86/xen: allow shared_info to be mapped by fixed HVA

missing HVA validation checks have been added and the 'hva == 0' test
has been changed to '!hva'. The KVM_XEN_ATTR_TYPE_SHARED_INFO and
KVM_XEN_ATTR_TYPE_SHARED_INFO_HVA cases are still largely handled as one
though as separation leads to duplicate calls to
kvm_xen_shared_info_init() which looks messy.

Also, patches with a 'xen' prefix have now been modified to have a
'x86/xen' prefix and patches with a 'selftests / xen' prefix have been
modified to have simply a 'selftests' prefix.

[1] https://lore.kernel.org/kvm/20240115125707.1183-1-paul@xen.org/

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(-)

base-commit: 7455665a3521aa7b56245c0a2810f748adc5fdd4
--
2.39.2