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/ccp/dbc.h | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 drivers/crypto/ccp/dbc.h (limited to 'drivers/crypto/ccp/dbc.h') diff --git a/drivers/crypto/ccp/dbc.h b/drivers/crypto/ccp/dbc.h new file mode 100644 index 000000000..e0fecbe92 --- /dev/null +++ b/drivers/crypto/ccp/dbc.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * AMD Platform Security Processor (PSP) Dynamic Boost Control support + * + * Copyright (C) 2023 Advanced Micro Devices, Inc. + * + * Author: Mario Limonciello + */ + +#ifndef __DBC_H__ +#define __DBC_H__ + +#include + +#include +#include +#include + +#include "psp-dev.h" + +struct psp_dbc_device { + struct device *dev; + struct psp_device *psp; + + union dbc_buffer *mbox; + + struct mutex ioctl_mutex; + + struct miscdevice char_dev; + + /* used to abstract communication path */ + bool use_ext; + u32 header_size; + u32 *payload_size; + u32 *result; + void *payload; +}; + +union dbc_buffer { + struct psp_request pa_req; + struct psp_ext_request ext_req; +}; + +void dbc_dev_destroy(struct psp_device *psp); +int dbc_dev_init(struct psp_device *psp); + +#endif /* __DBC_H */ -- cgit v1.3.1