mirror of
https://github.com/torvalds/linux.git
synced 2024-11-25 13:41:51 +00:00
3f9dfbebdc
Instead of using arch_has_restricted_virtio_memory_access() together with CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS, replace those with platform_has() and a new platform feature PLATFORM_VIRTIO_RESTRICTED_MEM_ACCESS. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # Arm64 only Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Borislav Petkov <bp@suse.de>
89 lines
2.0 KiB
C
89 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Memory Encryption Support Common Code
|
|
*
|
|
* Copyright (C) 2016 Advanced Micro Devices, Inc.
|
|
*
|
|
* Author: Tom Lendacky <thomas.lendacky@amd.com>
|
|
*/
|
|
|
|
#include <linux/dma-direct.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/swiotlb.h>
|
|
#include <linux/cc_platform.h>
|
|
#include <linux/mem_encrypt.h>
|
|
|
|
/* Override for DMA direct allocation check - ARCH_HAS_FORCE_DMA_UNENCRYPTED */
|
|
bool force_dma_unencrypted(struct device *dev)
|
|
{
|
|
/*
|
|
* For SEV, all DMA must be to unencrypted addresses.
|
|
*/
|
|
if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
|
|
return true;
|
|
|
|
/*
|
|
* For SME, all DMA must be to unencrypted addresses if the
|
|
* device does not support DMA to addresses that include the
|
|
* encryption mask.
|
|
*/
|
|
if (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT)) {
|
|
u64 dma_enc_mask = DMA_BIT_MASK(__ffs64(sme_me_mask));
|
|
u64 dma_dev_mask = min_not_zero(dev->coherent_dma_mask,
|
|
dev->bus_dma_limit);
|
|
|
|
if (dma_dev_mask <= dma_enc_mask)
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static void print_mem_encrypt_feature_info(void)
|
|
{
|
|
pr_info("Memory Encryption Features active:");
|
|
|
|
if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) {
|
|
pr_cont(" Intel TDX\n");
|
|
return;
|
|
}
|
|
|
|
pr_cont(" AMD");
|
|
|
|
/* Secure Memory Encryption */
|
|
if (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT)) {
|
|
/*
|
|
* SME is mutually exclusive with any of the SEV
|
|
* features below.
|
|
*/
|
|
pr_cont(" SME\n");
|
|
return;
|
|
}
|
|
|
|
/* Secure Encrypted Virtualization */
|
|
if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
|
|
pr_cont(" SEV");
|
|
|
|
/* Encrypted Register State */
|
|
if (cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
|
|
pr_cont(" SEV-ES");
|
|
|
|
/* Secure Nested Paging */
|
|
if (cc_platform_has(CC_ATTR_GUEST_SEV_SNP))
|
|
pr_cont(" SEV-SNP");
|
|
|
|
pr_cont("\n");
|
|
}
|
|
|
|
/* Architecture __weak replacement functions */
|
|
void __init mem_encrypt_init(void)
|
|
{
|
|
if (!cc_platform_has(CC_ATTR_MEM_ENCRYPT))
|
|
return;
|
|
|
|
/* Call into SWIOTLB to update the SWIOTLB DMA buffers */
|
|
swiotlb_update_mem_attributes();
|
|
|
|
print_mem_encrypt_feature_info();
|
|
}
|