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>

1 files changed, 64 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/debugfs-alienware-wmi b/Documentation/ABI/testing/debugfs-alienware-wmi
new file mode 100644
index 000000000..c7f525d6b
--- /dev/null
+++ b/Documentation/ABI/testing/debugfs-alienware-wmi
@@ -0,0 +1,64 @@
+What:		/sys/kernel/debug/alienware-wmi-<wmi_device_name>/system_description
+Date:		March 2025
+KernelVersion:	6.15
+Contact:	Kurt Borja <kuurtb@gmail.com>
+Description:
+		This file exposes the raw ``system_description`` number reported
+		by the WMAX device.
+
+		Only present on devices with the AWCC interface.
+
+		See Documentation/admin-guide/laptops/alienware-wmi.rst for
+		details.
+
+		RO
+
+What:		/sys/kernel/debug/alienware-wmi-<wmi_device_name>/hwmon_data
+Date:		March 2025
+KernelVersion:	6.15
+Contact:	Kurt Borja <kuurtb@gmail.com>
+Description:
+		This file exposes HWMON private data.
+
+		Includes fan sensor count, temperature sensor count, internal
+		fan IDs and internal temp IDs.
+
+		See Documentation/admin-guide/laptops/alienware-wmi.rst for
+		details.
+
+		RO
+
+What:		/sys/kernel/debug/alienware-wmi-<wmi_device_name>/pprof_data
+Date:		March 2025
+KernelVersion:	6.15
+Contact:	Kurt Borja <kuurtb@gmail.com>
+Description:
+		This file exposes Platform Profile private data.
+
+		Includes internal mapping to platform profiles and thermal
+		profile IDs.
+
+		See Documentation/admin-guide/laptops/alienware-wmi.rst for
+		details.
+
+		RO
+
+What:		/sys/kernel/debug/alienware-wmi-<wmi_device_name>/gpio_ctl/total_gpios
+Date:		May 2025
+KernelVersion:	6.16
+Contact:	Kurt Borja <kuurtb@gmail.com>
+Description:
+		Total number of GPIO pins reported by the device.
+
+		RO
+
+What:		/sys/kernel/debug/alienware-wmi-<wmi_device_name>/gpio_ctl/pinX
+Date:		May 2025
+KernelVersion:	6.16
+Contact:	Kurt Borja <kuurtb@gmail.com>
+Description:
+		This file controls GPIO pin X status.
+
+		See Documentation/wmi/devices/alienware-wmi.rst for details.
+
+		RW