From 93de2a6a4b91b72607136dd656edf03fb399d27f Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Wed, 23 Sep 2026 09:37:21 -0700 Subject: KVM: SEV: Do cache maintenance on the source VM during intra-host migration 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 Signed-off-by: Sean Christopherson Message-ID: <20260923163721.1584779-3-seanjc@google.com> Signed-off-by: Paolo Bonzini --- Documentation/userspace-api/media/index.rst | 67 +++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 Documentation/userspace-api/media/index.rst (limited to 'Documentation/userspace-api/media/index.rst') diff --git a/Documentation/userspace-api/media/index.rst b/Documentation/userspace-api/media/index.rst new file mode 100644 index 000000000..337ef6c7c --- /dev/null +++ b/Documentation/userspace-api/media/index.rst @@ -0,0 +1,67 @@ +.. SPDX-License-Identifier: GPL-2.0 + +.. include:: + +######################################## +Linux Media Infrastructure userspace API +######################################## + +This section contains the driver development information and Kernel APIs +used by media devices. + +Please see: + +Documentation/admin-guide/media/index.rst + + - for usage information about media subsystem and supported drivers; + +Documentation/driver-api/media/index.rst + + - for driver development information and Kernel APIs used by + media devices; + + +.. toctree:: + :caption: Table of Contents + :maxdepth: 1 + + intro + v4l/v4l2 + dvb/dvbapi + rc/remote_controllers + mediactl/media-controller + cec/cec-api + gen-errors + + glossary + + fdl-appendix + + drivers/index + +**Copyright** |copy| 2009-2020 : LinuxTV Developers + +:: + + Permission is granted to copy, distribute and/or modify this document + under the terms of the GNU Free Documentation License, Version 1.1 or + any later version published by the Free Software Foundation, with no + Invariant Sections. A copy of the license is included in the chapter + entitled "GNU Free Documentation License". + +Please notice that some documents inside the media userspace API, +when explicitly mentioned on its source code, are dual-licensed +with GNU Free Documentation License Version 1.1 and with the +GNU General Public License:: + + This documentation is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by the Free + Software Foundation; either version 2 of the License, or (at your option) any + later version. + + This program is distributed in the hope that it will be useful, but WITHOUT + ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + more details. + + For more details see the file COPYING in the source distribution of Linux. -- cgit v1.3.1