44f9c10361
Many devices must be reset before and after assignment, and as the host can't be trusted to do this, we have to do it from the hypervisor, and as we only deal with MMIO(platform) devices, which has not standard interface, we provide a function to register reset handler to modules, that can be registered with the MMIO base address of the device with pkvm_device_register_reset. Bug: 357781595 Bug: 348382247 Change-Id: Ie700aacf440caa6f1ffee85086a1edecdc104a5a Signed-off-by: Mostafa Saleh <smostafa@google.com>
46 lines
978 B
C
46 lines
978 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2023 Google LLC
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* Author: Mostafa Saleh <smostafa@google.com>
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*/
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#ifndef __KVM_DEVICE_H
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#define __KVM_DEVICE_H
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#include <asm/kvm_host.h>
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/*
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* @base: physical address of MMIO resource.
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* @size: size of resource in bytes.
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*/
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struct pkvm_dev_resource {
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u64 base;
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u64 size;
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};
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/*
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* @id: hypervisor ID of the IOMMU as defined by the driver.
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* @endpoint: endpoint ID of the device.
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*/
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struct pkvm_dev_iommu {
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u64 id;
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u64 endpoint;
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};
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#define PKVM_DEVICE_MAX_RESOURCE 32
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#define PKVM_DEVICE_MAX_IOMMU 32
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struct pkvm_device {
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struct pkvm_dev_resource resources[PKVM_DEVICE_MAX_RESOURCE];
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struct pkvm_dev_iommu iommus[PKVM_DEVICE_MAX_IOMMU];
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u32 nr_resources;
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u32 nr_iommus;
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u32 group_id;
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void *ctxt; /* Current context of the device*/
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unsigned short refcount;
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int (*reset_handler)(void *cookie, bool host_to_guest);
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void *cookie; /* cookie from drivers. */
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};
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#endif /* #ifndef __KVM_DEVICE_H */
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