From: Kay, Allen M <[EMAIL PROTECTED]>
This patch includes the functions to support VT-d for passthrough
devices.
[Ben: fixed memory pinning]
Signed-off-by: Kay, Allen M <[EMAIL PROTECTED]>
Signed-off-by: Weidong Han <[EMAIL PROTECTED]>
Signed-off-by: Ben-Ami Yassour <[EMAIL PROTECTED]>
---
arch/x86/kvm/Makefile | 2 +-
arch/x86/kvm/vtd.c | 189 ++++++++++++++++++++++++++++++++++++++++++++
include/asm-x86/kvm_host.h | 17 ++++
include/asm-x86/kvm_para.h | 14 +++
include/linux/kvm_host.h | 6 ++
5 files changed, 227 insertions(+), 1 deletions(-)
create mode 100644 arch/x86/kvm/vtd.c
diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index d0e940b..5d9d079 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -11,7 +11,7 @@ endif
EXTRA_CFLAGS += -Ivirt/kvm -Iarch/x86/kvm
kvm-objs := $(common-objs) x86.o mmu.o x86_emulate.o i8259.o irq.o lapic.o \
- i8254.o
+ i8254.o vtd.o
obj-$(CONFIG_KVM) += kvm.o
kvm-intel-objs = vmx.o
obj-$(CONFIG_KVM_INTEL) += kvm-intel.o
diff --git a/arch/x86/kvm/vtd.c b/arch/x86/kvm/vtd.c
new file mode 100644
index 0000000..5abeef1
--- /dev/null
+++ b/arch/x86/kvm/vtd.c
@@ -0,0 +1,189 @@
+/*
+ * 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
+ * Author: Allen M. Kay <[EMAIL PROTECTED]>
+ * Author: Weidong Han <[EMAIL PROTECTED]>
+ */
+
+#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);
+
+int kvm_iommu_map_pages(struct kvm *kvm,
+ gfn_t base_gfn, unsigned long npages)
+{
+ gfn_t gfn = base_gfn;
+ pfn_t pfn;
+ struct page *page;
+ int i, rc;
+ struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
+
+ if (!domain)
+ return -EFAULT;
+
+ for (i = 0; i < npages; i++) {
+ pfn = gfn_to_pfn(kvm, gfn);
+ if (pfn_valid(pfn)) {
+ rc = intel_iommu_page_mapping(domain,
+ gfn << PAGE_SHIFT,
+ pfn << PAGE_SHIFT,
+ PAGE_SIZE,
+ DMA_PTE_READ |
+ DMA_PTE_WRITE);
+ if (rc) {
+ page = pfn_to_page(pfn);
+ put_page(page);
+ }
+ } else {
+ printk(KERN_DEBUG "kvm_iommu_map_page:"
+ "invalid pfn=%lx\n", pfn);
+ return 0;
+ }
+ gfn++;
+ }
+ return 0;
+}
+
+static int kvm_iommu_map_memslots(struct kvm *kvm)
+{
+ int i, rc;
+ for (i = 0; i < kvm->nmemslots; i++) {
+ rc = kvm_iommu_map_pages(kvm, kvm->memslots[i].base_gfn,
+ kvm->memslots[i].npages);
+ if (rc)
+ return rc;
+ }
+ return 0;
+}
+
+int kvm_iommu_map_guest(struct kvm *kvm,
+ struct kvm_pci_passthrough_dev *pci_pt_dev)
+{
+ struct pci_dev *pdev = NULL;
+
+ printk(KERN_DEBUG "VT-d direct map: host bdf = %x:%x:%x\n",
+ pci_pt_dev->host.busnr,
+ PCI_SLOT(pci_pt_dev->host.devfn),
+ PCI_FUNC(pci_pt_dev->host.devfn));
+
+ for_each_pci_dev(pdev) {
+ if ((pdev->bus->number == pci_pt_dev->host.busnr) &&
+ (pdev->devfn == pci_pt_dev->host.devfn)) {
+ break;
+ }
+ }
+
+ 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_iommu_map_memslots(kvm)) {
+ kvm_iommu_unmap_memslots(kvm);
+ return -EFAULT;
+ }
+
+ intel_iommu_detach_dev(kvm->arch.intel_iommu_domain,
+ pdev->bus->number, pdev->devfn);
+
+ if (intel_iommu_context_mapping(kvm->arch.intel_iommu_domain,
+ pdev)) {
+ printk(KERN_ERR "Domain context map for %s failed",
+ pci_name(pdev));
+ return -EFAULT;
+ }
+ return 0;
+}
+
+static int kvm_iommu_put_pages(struct kvm *kvm,
+ gfn_t base_gfn, unsigned long npages)
+{
+ gfn_t gfn = base_gfn;
+ pfn_t pfn;
+ struct page *page;
+ struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
+ int i;
+
+ if (!domain)
+ return -EFAULT;
+
+ for (i = 0; i < npages; i++) {
+ pfn = (pfn_t)intel_iommu_iova_to_pfn(domain,
+ gfn << PAGE_SHIFT);
+
+ if (pfn && pfn_valid(pfn)) {
+ page = pfn_to_page(pfn);
+ put_page(page);
+ }
+ gfn++;
+ }
+ return 0;
+}
+
+static int kvm_iommu_unmap_memslots(struct kvm *kvm)
+{
+ int i, rc;
+ for (i = 0; i < kvm->nmemslots; i++) {
+ rc = kvm_iommu_put_pages(kvm, kvm->memslots[i].base_gfn,
+ kvm->memslots[i].npages);
+ if (rc)
+ return rc;
+ }
+ return 0;
+}
+
+int kvm_iommu_unmap_guest(struct kvm *kvm)
+{
+ struct kvm_pci_pt_dev_list *entry;
+ struct pci_dev *pdev = NULL;
+ struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
+
+ if (!domain)
+ return 0;
+
+ list_for_each_entry(entry, &kvm->arch.pci_pt_dev_head, list) {
+ printk(KERN_DEBUG "VT-d unmap: host bdf = %x:%x:%x\n",
+ entry->pt_dev.host.busnr,
+ PCI_SLOT(entry->pt_dev.host.devfn),
+ PCI_FUNC(entry->pt_dev.host.devfn));
+
+ for_each_pci_dev(pdev) {
+ if ((pdev->bus->number == entry->pt_dev.host.busnr) &&
+ (pdev->devfn == entry->pt_dev.host.devfn))
+ break;
+ }
+
+ if (pdev == NULL)
+ return -ENODEV;
+
+ /* detach kvm dmar domain */
+ intel_iommu_detach_dev(domain,
+ pdev->bus->number, pdev->devfn);
+ }
+ kvm_iommu_unmap_memslots(kvm);
+ intel_iommu_domain_exit(domain);
+ return 0;
+}
diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index 41332f6..9391e57 100644
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -308,6 +308,21 @@ struct kvm_mem_alias {
gfn_t target_gfn;
};
+struct kvm_pci_passthrough_dev_kernel {
+ struct kvm_pci_pt_info guest;
+ struct kvm_pci_pt_info host;
+ struct pci_dev *dev;
+};
+
+/* This list is to store the guest bus:device:function-irq and host
+ * bus:device:function-irq mapping for assigned devices.
+ */
+struct kvm_pci_pt_dev_list {
+ struct list_head list;
+ struct kvm_pci_passthrough_dev_kernel pt_dev;
+};
+
+
struct kvm_arch{
int naliases;
struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
@@ -320,6 +335,8 @@ struct kvm_arch{
* Hash table of struct kvm_mmu_page.
*/
struct list_head active_mmu_pages;
+ struct list_head pci_pt_dev_head;
+ struct dmar_domain *intel_iommu_domain;
struct kvm_pic *vpic;
struct kvm_ioapic *vioapic;
struct kvm_pit *vpit;
diff --git a/include/asm-x86/kvm_para.h b/include/asm-x86/kvm_para.h
index 76f3921..88153f4 100644
--- a/include/asm-x86/kvm_para.h
+++ b/include/asm-x86/kvm_para.h
@@ -144,4 +144,18 @@ static inline unsigned int kvm_arch_para_features(void)
#endif
+/* Stores information for identifying host PCI devices assigned to the
+ * guest: this is used in the host kernel and in the userspace.
+ */
+struct kvm_pci_pt_info {
+ unsigned char busnr;
+ unsigned int devfn;
+ __u32 irq;
+};
+
+/* Mapping between host and guest PCI device */
+struct kvm_pci_passthrough_dev {
+ struct kvm_pci_pt_info guest;
+ struct kvm_pci_pt_info host;
+};
#endif
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index fc685c5..424534b 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -278,6 +278,12 @@ int kvm_cpu_has_interrupt(struct kvm_vcpu *v);
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
+int kvm_iommu_map_pages(struct kvm *kvm, gfn_t base_gfn,
+ unsigned long npages);
+int kvm_iommu_map_guest(struct kvm *kvm,
+ struct kvm_pci_passthrough_dev *pci_pt_dev);
+int kvm_iommu_unmap_guest(struct kvm *kvm);
+
static inline void kvm_guest_enter(void)
{
account_system_vtime(current);
--
1.5.5.1
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
