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/crypto/api-digest.rst | 38 +++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 Documentation/crypto/api-digest.rst (limited to 'Documentation/crypto/api-digest.rst') diff --git a/Documentation/crypto/api-digest.rst b/Documentation/crypto/api-digest.rst new file mode 100644 index 000000000..02a2bcc26 --- /dev/null +++ b/Documentation/crypto/api-digest.rst @@ -0,0 +1,38 @@ +Message Digest +============== + +Message Digest Algorithm Definitions +------------------------------------ + +.. kernel-doc:: include/crypto/hash.h + :doc: Message Digest Algorithm Definitions + +.. kernel-doc:: include/crypto/hash.h + :functions: hash_alg_common ahash_alg shash_alg + +Asynchronous Message Digest API +------------------------------- + +.. kernel-doc:: include/crypto/hash.h + :doc: Asynchronous Message Digest API + +.. kernel-doc:: include/crypto/hash.h + :functions: crypto_alloc_ahash crypto_free_ahash crypto_ahash_init crypto_ahash_digestsize crypto_ahash_reqtfm crypto_ahash_reqsize crypto_ahash_statesize crypto_ahash_setkey crypto_ahash_finup crypto_ahash_final crypto_ahash_digest crypto_ahash_export crypto_ahash_import + +Asynchronous Hash Request Handle +-------------------------------- + +.. kernel-doc:: include/crypto/hash.h + :doc: Asynchronous Hash Request Handle + +.. kernel-doc:: include/crypto/hash.h + :functions: ahash_request_set_tfm ahash_request_alloc ahash_request_free ahash_request_set_callback ahash_request_set_crypt + +Synchronous Message Digest API +------------------------------ + +.. kernel-doc:: include/crypto/hash.h + :doc: Synchronous Message Digest API + +.. kernel-doc:: include/crypto/hash.h + :functions: crypto_alloc_shash crypto_free_shash crypto_shash_blocksize crypto_shash_digestsize crypto_shash_descsize crypto_shash_setkey crypto_shash_digest crypto_shash_export crypto_shash_import crypto_shash_init crypto_shash_update crypto_shash_final crypto_shash_finup -- cgit v1.3.1