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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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a1edec2245
The TSM module provides guest identification and attestation when a guest runs in CCA realm mode. By creating a dummy platform device, let's ensure the module is automatically loaded. The udev daemon loads the TSM module after it receives a device addition event. Once that happens, it can be used earlier in the boot process to decrypt the rootfs. Signed-off-by: Jeremy Linton <jeremy.linton@arm.com> Reviewed-by: Gavin Shan <gshan@redhat.com> Reviewed-by: Steven Price <steven.price@arm.com> Link: https://lore.kernel.org/r/20241220181236.172060-2-jeremy.linton@arm.com Signed-off-by: Will Deacon <will@kernel.org>
71 lines
1.6 KiB
C
71 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2024 ARM Ltd.
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*/
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#ifndef __ASM_RSI_H_
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#define __ASM_RSI_H_
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#include <linux/errno.h>
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#include <linux/jump_label.h>
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#include <asm/rsi_cmds.h>
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#define RSI_PDEV_NAME "arm-cca-dev"
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DECLARE_STATIC_KEY_FALSE(rsi_present);
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void __init arm64_rsi_init(void);
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bool __arm64_is_protected_mmio(phys_addr_t base, size_t size);
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static inline bool is_realm_world(void)
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{
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return static_branch_unlikely(&rsi_present);
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}
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static inline int rsi_set_memory_range(phys_addr_t start, phys_addr_t end,
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enum ripas state, unsigned long flags)
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{
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unsigned long ret;
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phys_addr_t top;
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while (start != end) {
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ret = rsi_set_addr_range_state(start, end, state, flags, &top);
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if (ret || top < start || top > end)
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return -EINVAL;
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start = top;
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}
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return 0;
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}
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/*
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* Convert the specified range to RAM. Do not use this if you rely on the
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* contents of a page that may already be in RAM state.
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*/
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static inline int rsi_set_memory_range_protected(phys_addr_t start,
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phys_addr_t end)
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{
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return rsi_set_memory_range(start, end, RSI_RIPAS_RAM,
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RSI_CHANGE_DESTROYED);
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}
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/*
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* Convert the specified range to RAM. Do not convert any pages that may have
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* been DESTROYED, without our permission.
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*/
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static inline int rsi_set_memory_range_protected_safe(phys_addr_t start,
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phys_addr_t end)
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{
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return rsi_set_memory_range(start, end, RSI_RIPAS_RAM,
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RSI_NO_CHANGE_DESTROYED);
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}
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static inline int rsi_set_memory_range_shared(phys_addr_t start,
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phys_addr_t end)
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{
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return rsi_set_memory_range(start, end, RSI_RIPAS_EMPTY,
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RSI_CHANGE_DESTROYED);
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}
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#endif /* __ASM_RSI_H_ */
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