KVM: SEV: Do cache maintenance on the source VM during intra-host migrationgrafted

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 <fane@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20260923163721.1584779-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 182 insertions, 0 deletions

diff --git a/include/sound/sof.h b/include/sound/sof.h
new file mode 100644
index 000000000..38d6c8cb5
--- /dev/null
+++ b/include/sound/sof.h
@@ -0,0 +1,182 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
+/*
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * Copyright(c) 2018 Intel Corporation
+ *
+ * Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
+ */
+
+#ifndef __INCLUDE_SOUND_SOF_H
+#define __INCLUDE_SOUND_SOF_H
+
+#include <linux/pci.h>
+#include <sound/soc.h>
+#include <sound/soc-acpi.h>
+
+struct snd_sof_dsp_ops;
+struct snd_sof_dev;
+
+/**
+ * enum sof_fw_state - DSP firmware state definitions
+ * @SOF_FW_BOOT_NOT_STARTED:	firmware boot is not yet started
+ * @SOF_DSPLESS_MODE:		DSP is not used
+ * @SOF_FW_BOOT_PREPARE:	preparing for boot (firmware loading for exaqmple)
+ * @SOF_FW_BOOT_IN_PROGRESS:	firmware boot is in progress
+ * @SOF_FW_BOOT_FAILED:		firmware boot failed
+ * @SOF_FW_BOOT_READY_FAILED:	firmware booted but fw_ready op failed
+ * @SOF_FW_BOOT_READY_OK:	firmware booted and fw_ready op passed
+ * @SOF_FW_BOOT_COMPLETE:	firmware is booted up and functional
+ * @SOF_FW_CRASHED:		firmware crashed after successful boot
+ */
+enum sof_fw_state {
+	SOF_FW_BOOT_NOT_STARTED = 0,
+	SOF_DSPLESS_MODE,
+	SOF_FW_BOOT_PREPARE,
+	SOF_FW_BOOT_IN_PROGRESS,
+	SOF_FW_BOOT_FAILED,
+	SOF_FW_BOOT_READY_FAILED,
+	SOF_FW_BOOT_READY_OK,
+	SOF_FW_BOOT_COMPLETE,
+	SOF_FW_CRASHED,
+};
+
+/* DSP power states */
+enum sof_dsp_power_states {
+	SOF_DSP_PM_D0,
+	SOF_DSP_PM_D1,
+	SOF_DSP_PM_D2,
+	SOF_DSP_PM_D3,
+};
+
+/* Definitions for multiple IPCs */
+enum sof_ipc_type {
+	SOF_IPC_TYPE_3,
+	SOF_IPC_TYPE_4,
+	SOF_IPC_TYPE_COUNT
+};
+
+struct sof_loadable_file_profile {
+	enum sof_ipc_type ipc_type;
+
+	const char *fw_path;
+	const char *fw_path_postfix;
+	const char *fw_name;
+	const char *fw_lib_path;
+	const char *fw_lib_path_postfix;
+	const char *tplg_path;
+	const char *tplg_name;
+};
+
+/*
+ * SOF Platform data.
+ */
+struct snd_sof_pdata {
+	const char *name;
+	const char *platform;
+
+	/*
+	 * PCI SSID. As PCI does not define 0 as invalid, the subsystem_id_set
+	 * flag indicates that a value has been written to these members.
+	 */
+	unsigned short subsystem_vendor;
+	unsigned short subsystem_device;
+	bool subsystem_id_set;
+
+	struct device *dev;
+
+	/*
+	 * notification callback used if the hardware initialization
+	 * can take time or is handled in a workqueue. This callback
+	 * can be used by the caller to e.g. enable runtime_pm
+	 * or limit functionality until all low-level inits are
+	 * complete.
+	 */
+	void (*sof_probe_complete)(struct device *dev);
+
+	/* descriptor */
+	const struct sof_dev_desc *desc;
+
+	/* platform's preferred IPC type and path overrides */
+	struct sof_loadable_file_profile ipc_file_profile_base;
+
+	/* firmware and topology filenames */
+	const char *fw_filename_prefix;
+	const char *fw_filename;
+	const char *tplg_filename_prefix;
+	const char *tplg_filename;
+	bool disable_function_topology;
+
+	/* loadable external libraries available under this directory */
+	const char *fw_lib_prefix;
+
+	/* machine */
+	struct platform_device *pdev_mach;
+	const struct snd_soc_acpi_mach *machine;
+	const struct snd_sof_of_mach *of_machine;
+
+	void *hw_pdata;
+
+	enum sof_ipc_type ipc_type;
+};
+
+/*
+ * Descriptor used for setting up SOF platform data. This is used when
+ * ACPI/PCI data is missing or mapped differently.
+ */
+struct sof_dev_desc {
+	/* list of machines using this configuration */
+	struct snd_soc_acpi_mach *machines;
+	struct snd_sof_of_mach *of_machines;
+
+	/* alternate list of machines using this configuration */
+	struct snd_soc_acpi_mach *alt_machines;
+
+	bool use_acpi_target_states;
+
+	/* Platform resource indexes in BAR / ACPI resources. */
+	/* Must set to -1 if not used - add new items to end */
+	int resindex_lpe_base;
+	int resindex_pcicfg_base;
+	int resindex_imr_base;
+	int irqindex_host_ipc;
+
+	/* IPC timeouts in ms */
+	int ipc_timeout;
+	int boot_timeout;
+
+	/* chip information for dsp */
+	const void *chip_info;
+
+	/* defaults for no codec mode */
+	const char *nocodec_tplg_filename;
+
+	/* information on supported IPCs */
+	unsigned int ipc_supported_mask;
+	enum sof_ipc_type ipc_default;
+
+	/* The platform supports DSPless mode */
+	bool dspless_mode_supported;
+
+	/* On demand DSP booting is possible on the platform */
+	bool on_demand_dsp_boot;
+
+	/* defaults paths for firmware, library and topology files */
+	const char *default_fw_path[SOF_IPC_TYPE_COUNT];
+	const char *default_lib_path[SOF_IPC_TYPE_COUNT];
+	const char *default_tplg_path[SOF_IPC_TYPE_COUNT];
+
+	/* default firmware name */
+	const char *default_fw_filename[SOF_IPC_TYPE_COUNT];
+
+	const struct snd_sof_dsp_ops *ops;
+	int (*ops_init)(struct snd_sof_dev *sdev);
+	void (*ops_free)(struct snd_sof_dev *sdev);
+};
+
+int sof_dai_get_mclk(struct snd_soc_pcm_runtime *rtd);
+int sof_dai_get_bclk(struct snd_soc_pcm_runtime *rtd);
+int sof_dai_get_tdm_slots(struct snd_soc_pcm_runtime *rtd);
+
+#endif