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 --- include/memory/renesas-rpc-if.h | 83 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 include/memory/renesas-rpc-if.h (limited to 'include/memory') diff --git a/include/memory/renesas-rpc-if.h b/include/memory/renesas-rpc-if.h new file mode 100644 index 000000000..53663c4e5 --- /dev/null +++ b/include/memory/renesas-rpc-if.h @@ -0,0 +1,83 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Renesas RPC-IF core driver + * + * Copyright (C) 2018~2019 Renesas Solutions Corp. + * Copyright (C) 2019 Macronix International Co., Ltd. + * Copyright (C) 2019-2020 Cogent Embedded, Inc. + */ + +#ifndef __RENESAS_RPC_IF_H +#define __RENESAS_RPC_IF_H + +#include +#include + +enum rpcif_data_dir { + RPCIF_NO_DATA, + RPCIF_DATA_IN, + RPCIF_DATA_OUT, +}; + +struct rpcif_op { + struct { + u8 buswidth; + u8 opcode; + bool ddr; + } cmd, ocmd; + + struct { + u8 nbytes; + u8 buswidth; + bool ddr; + u64 val; + } addr; + + struct { + u8 ncycles; + u8 buswidth; + } dummy; + + struct { + u8 nbytes; + u8 buswidth; + bool ddr; + u32 val; + } option; + + struct { + u8 buswidth; + unsigned int nbytes; + enum rpcif_data_dir dir; + bool ddr; + union { + void *in; + const void *out; + } buf; + } data; +}; + +enum rpcif_type { + RPCIF_RCAR_GEN3, + RPCIF_RCAR_GEN4, + RPCIF_RZ_G2L, + XSPI_RZ_G3E, +}; + +struct rpcif { + struct device *dev; + void __iomem *dirmap; + size_t size; + bool xspi; +}; + +int rpcif_sw_init(struct rpcif *rpc, struct device *dev); +int rpcif_hw_init(struct device *dev, bool hyperflash); +void rpcif_prepare(struct device *dev, const struct rpcif_op *op, u64 *offs, + size_t *len); +int rpcif_manual_xfer(struct device *dev); +ssize_t rpcif_dirmap_read(struct device *dev, u64 offs, size_t len, void *buf); +ssize_t xspi_dirmap_write(struct device *dev, u64 offs, size_t len, + const void *buf); + +#endif // __RENESAS_RPC_IF_H -- cgit v1.3.1