KVM: SEV: Do cache maintenance on the source VM during intra-host migrationgrafted

Manually perform cache maintenance on the source VM during intra-host
migration to ensure no stale data is left in CPU caches after the VM is
destroyed.  Because the source VM is "converted" to a non-SEV VM, KVM's
memory reclaim flows won't trigger cache maintenance, e.g. when all guest
memory is reclaimed in response to detaching from the mmu_notifier.

Note, relying on the destination VM to do cache maintenance isn't an option
as KVM doesn't require identical guest memory configurations, i.e. the
source VM may have access to memory that the destination VM does not.
Enforcing equivalent memory configurations is infeasible, as it would
require a *deep* comparison of memslots, e.g. to verify that not only are
the memslot identical, but what the memslots point at is also identical.

Fixes: b56639318bb2 ("KVM: SEV: Add support for SEV intra host migration")
Cc: stable@vger.kernel.org
Reported-by: Stefan Teodorescu <fane@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20260923163721.1584779-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

20 files changed, 360 insertions, 0 deletions

diff --git a/Documentation/gpu/xe/index.rst b/Documentation/gpu/xe/index.rst
new file mode 100644
index 000000000..665c0e936
--- /dev/null
+++ b/Documentation/gpu/xe/index.rst
@@ -0,0 +1,37 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+.. _drm/xe:
+
+=======================
+drm/xe Intel GFX Driver
+=======================
+
+The drm/xe driver supports some future GFX cards with rendering, display,
+compute and media. Support for currently available platforms like TGL, ADL,
+DG2, etc is provided to prototype the driver.
+
+The display, or :ref:`drm-kms`, support for drm/xe is provided by
+:ref:`drm/intel-display`, and shared with :ref:`drm/i915 <drm/i915>`.
+
+.. toctree::
+   :titlesonly:
+
+   xe_mm
+   xe_map
+   xe_migrate
+   xe_exec_queue
+   xe_cs
+   xe_pm
+   xe_gt_freq
+   xe_pcode
+   xe_gt_mcr
+   xe_wa
+   xe_rtp
+   xe_firmware
+   xe_tile
+   xe_debugging
+   xe_devcoredump
+   xe_device
+   xe-drm-usage-stats.rst
+   xe_configfs
+   xe_gt_stats
diff --git a/Documentation/gpu/xe/xe-drm-usage-stats.rst b/Documentation/gpu/xe/xe-drm-usage-stats.rst
new file mode 100644
index 000000000..482d503ae
--- /dev/null
+++ b/Documentation/gpu/xe/xe-drm-usage-stats.rst
@@ -0,0 +1,10 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+.. _xe-usage-stats:
+
+========================================
+Xe DRM client usage stats implementation
+========================================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_drm_client.c
+   :doc: DRM Client usage stats
diff --git a/Documentation/gpu/xe/xe_configfs.rst b/Documentation/gpu/xe/xe_configfs.rst
new file mode 100644
index 000000000..7f8ec39dc
--- /dev/null
+++ b/Documentation/gpu/xe/xe_configfs.rst
@@ -0,0 +1,16 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+.. _xe_configfs:
+
+===========
+Xe Configfs
+===========
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_configfs.c
+   :doc: Xe Configfs
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_configfs.c
+   :internal:
diff --git a/Documentation/gpu/xe/xe_cs.rst b/Documentation/gpu/xe/xe_cs.rst
new file mode 100644
index 000000000..e379aed4f
--- /dev/null
+++ b/Documentation/gpu/xe/xe_cs.rst
@@ -0,0 +1,8 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+==================
+Command submission
+==================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_exec.c
+   :doc: Execbuf (User GPU command submission)
diff --git a/Documentation/gpu/xe/xe_debugging.rst b/Documentation/gpu/xe/xe_debugging.rst
new file mode 100644
index 000000000..d65e56ff3
--- /dev/null
+++ b/Documentation/gpu/xe/xe_debugging.rst
@@ -0,0 +1,7 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+=========
+Debugging
+=========
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_assert.h
diff --git a/Documentation/gpu/xe/xe_devcoredump.rst b/Documentation/gpu/xe/xe_devcoredump.rst
new file mode 100644
index 000000000..ae4ec0e34
--- /dev/null
+++ b/Documentation/gpu/xe/xe_devcoredump.rst
@@ -0,0 +1,14 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+==================
+Xe Device Coredump
+==================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_devcoredump.c
+   :doc: Xe device coredump
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_devcoredump.c
+   :internal:
diff --git a/Documentation/gpu/xe/xe_device.rst b/Documentation/gpu/xe/xe_device.rst
new file mode 100644
index 000000000..d3a022362
--- /dev/null
+++ b/Documentation/gpu/xe/xe_device.rst
@@ -0,0 +1,17 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+.. _xe-device-wedging:
+
+==================
+Xe Device Wedging
+==================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_device.c
+   :doc: Xe Device Wedging
+
+====================
+GPU Health Indicator
+====================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_ras.c
+   :doc: GPU Health Indicator
diff --git a/Documentation/gpu/xe/xe_exec_queue.rst b/Documentation/gpu/xe/xe_exec_queue.rst
new file mode 100644
index 000000000..870780621
--- /dev/null
+++ b/Documentation/gpu/xe/xe_exec_queue.rst
@@ -0,0 +1,34 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+===============
+Execution Queue
+===============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_exec_queue.c
+   :doc: Execution Queue
+
+Multi Queue Group
+=================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_exec_queue.c
+   :doc: Multi Queue Group
+
+.. _multi-queue-group-guc-interface:
+
+Multi Queue Group GuC interface
+===============================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_guc_submit.c
+   :doc: Multi Queue Group GuC interface
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_exec_queue_types.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_exec_queue.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_exec_queue.c
+   :internal:
diff --git a/Documentation/gpu/xe/xe_firmware.rst b/Documentation/gpu/xe/xe_firmware.rst
new file mode 100644
index 000000000..d3030d1c9
--- /dev/null
+++ b/Documentation/gpu/xe/xe_firmware.rst
@@ -0,0 +1,46 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+========
+Firmware
+========
+
+Firmware Layout
+===============
+
+.. kernel-doc:: drivers/gpu/drm/xe/abi/uc_fw_abi.h
+   :doc: CSS-based Firmware Layout
+
+.. kernel-doc:: drivers/gpu/drm/xe/abi/uc_fw_abi.h
+   :doc: GSC-based Firmware Layout
+
+Write Once Protected Content Memory (WOPCM) Layout
+==================================================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_wopcm.c
+   :doc: Write Once Protected Content Memory (WOPCM) Layout
+
+GuC CTB Blob
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_guc_ct.c
+   :doc: GuC CTB Blob
+
+GuC Power Conservation (PC)
+===========================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_guc_pc.c
+   :doc: GuC Power Conservation (PC)
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_guc_rc.c
+   :doc: GuC Render C-states (GuC RC)
+
+PCIe Gen5 Limitations
+=====================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_device_sysfs.c
+   :doc: PCIe Gen5 Limitations
+
+Internal API
+============
+
+TODO
diff --git a/Documentation/gpu/xe/xe_gt_freq.rst b/Documentation/gpu/xe/xe_gt_freq.rst
new file mode 100644
index 000000000..182d6aabe
--- /dev/null
+++ b/Documentation/gpu/xe/xe_gt_freq.rst
@@ -0,0 +1,17 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+==========================
+Xe GT Frequency Management
+==========================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_gt_freq.c
+   :doc: Xe GT Frequency Management
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_gt_throttle.c
+   :doc: Xe GT Throttle
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_gt_freq.c
+   :internal:
diff --git a/Documentation/gpu/xe/xe_gt_mcr.rst b/Documentation/gpu/xe/xe_gt_mcr.rst
new file mode 100644
index 000000000..848c07bc3
--- /dev/null
+++ b/Documentation/gpu/xe/xe_gt_mcr.rst
@@ -0,0 +1,13 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+==============================================
+GT Multicast/Replicated (MCR) Register Support
+==============================================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_gt_mcr.c
+   :doc: GT Multicast/Replicated (MCR) Register Support
+
+Internal API
+============
+
+TODO
diff --git a/Documentation/gpu/xe/xe_gt_stats.rst b/Documentation/gpu/xe/xe_gt_stats.rst
new file mode 100644
index 000000000..5ff806aba
--- /dev/null
+++ b/Documentation/gpu/xe/xe_gt_stats.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+================
+Xe GT Statistics
+================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_gt_stats.c
+   :doc: Xe GT Statistics
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_gt_stats_types.h
+   :internal:
diff --git a/Documentation/gpu/xe/xe_map.rst b/Documentation/gpu/xe/xe_map.rst
new file mode 100644
index 000000000..a098cfd2d
--- /dev/null
+++ b/Documentation/gpu/xe/xe_map.rst
@@ -0,0 +1,8 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+=========
+Map Layer
+=========
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_map.h
+   :doc: Map layer
diff --git a/Documentation/gpu/xe/xe_migrate.rst b/Documentation/gpu/xe/xe_migrate.rst
new file mode 100644
index 000000000..f92faec0a
--- /dev/null
+++ b/Documentation/gpu/xe/xe_migrate.rst
@@ -0,0 +1,8 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+=============
+Migrate Layer
+=============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_migrate_doc.h
+   :doc: Migrate Layer
diff --git a/Documentation/gpu/xe/xe_mm.rst b/Documentation/gpu/xe/xe_mm.rst
new file mode 100644
index 000000000..95864a450
--- /dev/null
+++ b/Documentation/gpu/xe/xe_mm.rst
@@ -0,0 +1,29 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+=================
+Memory Management
+=================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_bo_doc.h
+   :doc: Buffer Objects (BO)
+
+GGTT
+====
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_ggtt.c
+   :doc: Global Graphics Translation Table (GGTT)
+
+GGTT Internal API
+-----------------
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_ggtt_types.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_ggtt.c
+   :internal:
+
+Pagetable building
+==================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_pt.c
+   :doc: Pagetable building
diff --git a/Documentation/gpu/xe/xe_pcode.rst b/Documentation/gpu/xe/xe_pcode.rst
new file mode 100644
index 000000000..2a4360112
--- /dev/null
+++ b/Documentation/gpu/xe/xe_pcode.rst
@@ -0,0 +1,23 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+=====
+Pcode
+=====
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_pcode.c
+   :doc: PCODE
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_pcode.c
+   :internal:
+
+.. _xe-survivability-mode:
+
+==================
+Survivability Mode
+==================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_survivability_mode.c
+   :doc: Survivability Mode
diff --git a/Documentation/gpu/xe/xe_pm.rst b/Documentation/gpu/xe/xe_pm.rst
new file mode 100644
index 000000000..6781cdfb2
--- /dev/null
+++ b/Documentation/gpu/xe/xe_pm.rst
@@ -0,0 +1,14 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+========================
+Runtime Power Management
+========================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_pm.c
+   :doc: Xe Power Management
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_pm.c
+   :internal:
diff --git a/Documentation/gpu/xe/xe_rtp.rst b/Documentation/gpu/xe/xe_rtp.rst
new file mode 100644
index 000000000..7fdf4b6c1
--- /dev/null
+++ b/Documentation/gpu/xe/xe_rtp.rst
@@ -0,0 +1,20 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+=========================
+Register Table Processing
+=========================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_rtp.c
+   :doc: Register Table Processing
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_rtp_types.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_rtp.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_rtp.c
+   :internal:
diff --git a/Documentation/gpu/xe/xe_tile.rst b/Documentation/gpu/xe/xe_tile.rst
new file mode 100644
index 000000000..c33f68dd9
--- /dev/null
+++ b/Documentation/gpu/xe/xe_tile.rst
@@ -0,0 +1,14 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+==================
+Multi-tile Devices
+==================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_tile.c
+   :doc: Multi-tile Design
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_tile.c
+   :internal:
diff --git a/Documentation/gpu/xe/xe_wa.rst b/Documentation/gpu/xe/xe_wa.rst
new file mode 100644
index 000000000..f8811cc6a
--- /dev/null
+++ b/Documentation/gpu/xe/xe_wa.rst
@@ -0,0 +1,14 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+====================
+Hardware workarounds
+====================
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_wa.c
+   :doc: Hardware workarounds
+
+Internal API
+============
+
+.. kernel-doc:: drivers/gpu/drm/xe/xe_wa.c
+   :internal: