linux-kernel - [PATCH v13 00/21] KVM: xen: update shared_info and vcpu

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Date: Thu, 15 Feb 2024 15:28:55 +0000
From: Paul Durrant <paul@....org>
To: Paolo Bonzini <pbonzini@...hat.com>,
	Jonathan Corbet <corbet@....net>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Janosch Frank <frankja@...ux.ibm.com>,
	Claudio Imbrenda <imbrenda@...ux.ibm.com>,
	David Hildenbrand <david@...hat.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	Sean Christopherson <seanjc@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Paul Durrant <paul@....org>,
	Shuah Khan <shuah@...nel.org>,
	kvm@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-s390@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH v13 00/21] KVM: xen: update shared_info and vcpu_info handling

From: Paul Durrant <pdurrant@...zon.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