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[module] AMD SEV support
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AUTHORS
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AUTHORS
@ -66,3 +66,4 @@ David Meier <meier_david_91@hotmail.com> (Kenny.ch)
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Daniel Cordero <looking-glass@0xdc.io> (0xdc)
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esi <git@esibun.net> (esibun)
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MakiseKurisu <saberconer@gmail.com> (MakiseKurisu)
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Zenithal <i@zenithal.me> (ZenithalHourlyRate)
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@ -1,6 +1,6 @@
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/**
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* Looking Glass
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* Copyright © 2017-2022 The Looking Glass Authors
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* Copyright © 2017-2023 The Looking Glass Authors
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* https://looking-glass.io
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*
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* This program is free software; you can redistribute it and/or modify it
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@ -33,6 +33,10 @@
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#include <asm/io.h>
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#ifdef CONFIG_AMD_MEM_ENCRYPT
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#include <asm/mem_encrypt.h>
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#endif
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#include "kvmfr.h"
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DEFINE_MUTEX(minor_lock);
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@ -321,6 +325,25 @@ static int device_mmap(struct file * filp, struct vm_area_struct * vma)
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switch (kdev->type)
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{
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case KVMFR_TYPE_PCI:
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#ifdef CONFIG_AMD_MEM_ENCRYPT
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/* Clear C-bit for ivshmem when mapped
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* as normal memory to the userspace
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*
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* devm_memremap below will "hotplug" the ivshmem as normal mem,
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* when sev and/or sev-snp is effective,
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* ivshmem will be encrypted and private memory.
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*
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* However, this is not the intention of ivshmem, as it
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* is meant to be shared with other VMs and the hypervisor.
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*
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* Mapping ivshmem as iomem could resolve the sev/sev-snp issue,
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* but it then will not be cached and the performance is low.
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*
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* To maintain high performance yet make it shared, we should
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* clear the C-bit for ivshmem.
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*/
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vma->vm_page_prot.pgprot &= ~(sme_me_mask);
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#endif
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vma->vm_ops = &pci_mmap_ops;
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vma->vm_private_data = kdev;
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return 0;
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@ -626,7 +649,7 @@ MODULE_DEVICE_TABLE(pci, kvmfr_pci_ids);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Geoffrey McRae <geoff@hostfission.com>");
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MODULE_AUTHOR("Guanzhong Chen <quantum2048@gmail.com>");
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MODULE_VERSION("0.0.8");
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MODULE_VERSION("0.0.9");
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,16,0)
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MODULE_IMPORT_NS(DMA_BUF);
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#endif
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