https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: fc74e0a40e4f9fd0468e34045b0c45bba11dcbb2 authored by Linus Torvalds on 26 December 2021, 21:17:17 UTC
Linux 5.16-rc7
Linux 5.16-rc7
Tip revision: fc74e0a
cc_platform.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* Confidential Computing Platform Capability checks
*
* Copyright (C) 2021 Advanced Micro Devices, Inc.
*
* Author: Tom Lendacky <thomas.lendacky@amd.com>
*/
#include <linux/export.h>
#include <linux/cc_platform.h>
#include <linux/mem_encrypt.h>
#include <asm/processor.h>
static bool __maybe_unused intel_cc_platform_has(enum cc_attr attr)
{
#ifdef CONFIG_INTEL_TDX_GUEST
return false;
#else
return false;
#endif
}
/*
* SME and SEV are very similar but they are not the same, so there are
* times that the kernel will need to distinguish between SME and SEV. The
* cc_platform_has() function is used for this. When a distinction isn't
* needed, the CC_ATTR_MEM_ENCRYPT attribute can be used.
*
* The trampoline code is a good example for this requirement. Before
* paging is activated, SME will access all memory as decrypted, but SEV
* will access all memory as encrypted. So, when APs are being brought
* up under SME the trampoline area cannot be encrypted, whereas under SEV
* the trampoline area must be encrypted.
*/
static bool amd_cc_platform_has(enum cc_attr attr)
{
#ifdef CONFIG_AMD_MEM_ENCRYPT
switch (attr) {
case CC_ATTR_MEM_ENCRYPT:
return sme_me_mask;
case CC_ATTR_HOST_MEM_ENCRYPT:
return sme_me_mask && !(sev_status & MSR_AMD64_SEV_ENABLED);
case CC_ATTR_GUEST_MEM_ENCRYPT:
return sev_status & MSR_AMD64_SEV_ENABLED;
case CC_ATTR_GUEST_STATE_ENCRYPT:
return sev_status & MSR_AMD64_SEV_ES_ENABLED;
default:
return false;
}
#else
return false;
#endif
}
bool cc_platform_has(enum cc_attr attr)
{
if (sme_me_mask)
return amd_cc_platform_has(attr);
return false;
}
EXPORT_SYMBOL_GPL(cc_platform_has);