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 --- io_uring/fs.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 io_uring/fs.h (limited to 'io_uring/fs.h') diff --git a/io_uring/fs.h b/io_uring/fs.h new file mode 100644 index 000000000..0bb5efe3d --- /dev/null +++ b/io_uring/fs.h @@ -0,0 +1,20 @@ +// SPDX-License-Identifier: GPL-2.0 + +int io_renameat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_renameat(struct io_kiocb *req, unsigned int issue_flags); +void io_renameat_cleanup(struct io_kiocb *req); + +int io_unlinkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags); +void io_unlinkat_cleanup(struct io_kiocb *req); + +int io_mkdirat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags); +void io_mkdirat_cleanup(struct io_kiocb *req); + +int io_symlinkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags); + +int io_linkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_linkat(struct io_kiocb *req, unsigned int issue_flags); +void io_link_cleanup(struct io_kiocb *req); -- cgit v1.3.1