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/*
* Copyright (c) 2006, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*
* Copyright (C) 2006-2008 Intel Corporation
* Copyright IBM Corporation, 2008
* Author: Allen M. Kay <allen.m.kay@intel.com>
* Author: Weidong Han <weidong.han@intel.com>
* Author: Ben-Ami Yassour <benami@il.ibm.com>
*/
#include <linux/list.h>
#include <linux/kvm_host.h>
#include <linux/pci.h>
#include <linux/dmar.h>
#include <linux/intel-iommu.h>
static int kvm_iommu_unmap_memslots(struct kvm *kvm);
static void kvm_iommu_put_pages(struct kvm *kvm,
gfn_t base_gfn, unsigned long npages);
int kvm_iommu_map_pages(struct kvm *kvm,
gfn_t base_gfn, unsigned long npages)
{
gfn_t gfn = base_gfn;
pfn_t pfn;
int i, r = 0;
struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
/* check if iommu exists and in use */
if (!domain)
return 0;
for (i = 0; i < npages; i++) {
/* check if already mapped */
pfn = (pfn_t)intel_iommu_iova_to_pfn(domain,
gfn_to_gpa(gfn));
if (pfn)
continue;
pfn = gfn_to_pfn(kvm, gfn);
r = intel_iommu_page_mapping(domain,
gfn_to_gpa(gfn),
pfn_to_hpa(pfn),
PAGE_SIZE,
DMA_PTE_READ |
DMA_PTE_WRITE);
if (r) {
printk(KERN_ERR "kvm_iommu_map_pages:"
"iommu failed to map pfn=%lx\n", pfn);
goto unmap_pages;
}
gfn++;
}
return 0;
unmap_pages:
kvm_iommu_put_pages(kvm, base_gfn, i);
return r;
}
static int kvm_iommu_map_memslots(struct kvm *kvm)
{
int i, r;
down_read(&kvm->slots_lock);
for (i = 0; i < kvm->nmemslots; i++) {
r = kvm_iommu_map_pages(kvm, kvm->memslots[i].base_gfn,
kvm->memslots[i].npages);
if (r)
break;
}
up_read(&kvm->slots_lock);
return r;
}
int kvm_iommu_map_guest(struct kvm *kvm,
struct kvm_assigned_dev_kernel *assigned_dev)
{
struct pci_dev *pdev = NULL;
int r;
if (!intel_iommu_found()) {
printk(KERN_ERR "%s: intel iommu not found\n", __func__);
return -ENODEV;
}
printk(KERN_DEBUG "VT-d direct map: host bdf = %x:%x:%x\n",
assigned_dev->host_busnr,
PCI_SLOT(assigned_dev->host_devfn),
PCI_FUNC(assigned_dev->host_devfn));
pdev = assigned_dev->dev;
if (pdev == NULL) {
if (kvm->arch.intel_iommu_domain) {
intel_iommu_domain_exit(kvm->arch.intel_iommu_domain);
kvm->arch.intel_iommu_domain = NULL;
}
return -ENODEV;
}
kvm->arch.intel_iommu_domain = intel_iommu_domain_alloc(pdev);
if (!kvm->arch.intel_iommu_domain)
return -ENODEV;
r = kvm_iommu_map_memslots(kvm);
if (r)
goto out_unmap;
intel_iommu_detach_dev(kvm->arch.intel_iommu_domain,
pdev->bus->number, pdev->devfn);
r = intel_iommu_context_mapping(kvm->arch.intel_iommu_domain,
pdev);
if (r) {
printk(KERN_ERR "Domain context map for %s failed",
pci_name(pdev));
goto out_unmap;
}
return 0;
out_unmap:
kvm_iommu_unmap_memslots(kvm);
return r;
}
static void kvm_iommu_put_pages(struct kvm *kvm,
gfn_t base_gfn, unsigned long npages)
{
gfn_t gfn = base_gfn;
pfn_t pfn;
struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
int i;
for (i = 0; i < npages; i++) {
pfn = (pfn_t)intel_iommu_iova_to_pfn(domain,
gfn_to_gpa(gfn));
kvm_release_pfn_clean(pfn);
gfn++;
}
}
static int kvm_iommu_unmap_memslots(struct kvm *kvm)
{
int i;
down_read(&kvm->slots_lock);
for (i = 0; i < kvm->nmemslots; i++) {
kvm_iommu_put_pages(kvm, kvm->memslots[i].base_gfn,
kvm->memslots[i].npages);
}
up_read(&kvm->slots_lock);
return 0;
}
int kvm_iommu_unmap_guest(struct kvm *kvm)
{
struct kvm_assigned_dev_kernel *entry;
struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
/* check if iommu exists and in use */
if (!domain)
return 0;
list_for_each_entry(entry, &kvm->arch.assigned_dev_head, list) {
printk(KERN_DEBUG "VT-d unmap: host bdf = %x:%x:%x\n",
entry->host_busnr,
PCI_SLOT(entry->host_devfn),
PCI_FUNC(entry->host_devfn));
/* detach kvm dmar domain */
intel_iommu_detach_dev(domain, entry->host_busnr,
entry->host_devfn);
}
kvm_iommu_unmap_memslots(kvm);
intel_iommu_domain_exit(domain);
return 0;
}
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