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 --- drivers/crypto/omap-crypto.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 drivers/crypto/omap-crypto.h (limited to 'drivers/crypto/omap-crypto.h') diff --git a/drivers/crypto/omap-crypto.h b/drivers/crypto/omap-crypto.h new file mode 100644 index 000000000..506ccde6f --- /dev/null +++ b/drivers/crypto/omap-crypto.h @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * OMAP Crypto driver common support routines. + * + * Copyright (c) 2017 Texas Instruments Incorporated + * Tero Kristo + */ + +#ifndef __CRYPTO_OMAP_CRYPTO_H +#define __CRYPTO_OMAP_CRYPTO_H + +enum { + OMAP_CRYPTO_NOT_ALIGNED = 1, + OMAP_CRYPTO_BAD_DATA_LENGTH, +}; + +#define OMAP_CRYPTO_DATA_COPIED BIT(0) +#define OMAP_CRYPTO_SG_COPIED BIT(1) + +#define OMAP_CRYPTO_COPY_MASK 0x3 + +#define OMAP_CRYPTO_COPY_DATA BIT(0) +#define OMAP_CRYPTO_FORCE_COPY BIT(1) +#define OMAP_CRYPTO_ZERO_BUF BIT(2) +#define OMAP_CRYPTO_FORCE_SINGLE_ENTRY BIT(3) + +int omap_crypto_align_sg(struct scatterlist **sg, int total, int bs, + struct scatterlist *new_sg, u16 flags, + u8 flags_shift, unsigned long *dd_flags); +void omap_crypto_cleanup(struct scatterlist *sg, struct scatterlist *orig, + int offset, int len, u8 flags_shift, + unsigned long flags); + +#endif -- cgit v1.3.1