Kay, Allen M wrote:
vt-d specific files in KVM for contructing vt-d page tables and
programming vt-d context entries.
Signed-off-by: Allen M. Kay <[EMAIL PROTECTED]>
diff --git a/arch/x86/kvm/vtd.c b/arch/x86/kvm/vtd.c
new file mode 100644
index 0000000..634802c
--- /dev/null
+++ b/arch/x86/kvm/vtd.c
@@ -0,0 +1,197 @@
+/*
+ * 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>
+#include "vtd.h"
+
+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;
+
+ if (!kvm->arch.domain)
+ return -EFAULT;
+
+ printk(KERN_DEBUG "kvm_iommu_map_page: gpa = %lx\n",
+ gfn << PAGE_SHIFT);
+ printk(KERN_DEBUG "kvm_iommu_map_page: hpa = %lx\n",
+ gfn_to_pfn(kvm, base_gfn) << PAGE_SHIFT);
+ printk(KERN_DEBUG "kvm_iommu_map_page: size = %lx\n",
+ npages*PAGE_SIZE);
+
+ for (i = 0; i < npages; i++) {
+ pfn = gfn_to_pfn(kvm, gfn);
+ if (pfn_valid(pfn)) {
+ rc = kvm_intel_iommu_page_mapping(kvm->arch.domain,
+ gfn << PAGE_SHIFT, pfn << PAGE_SHIFT,
+ PAGE_SIZE, DMA_PTE_READ | DMA_PTE_WRITE);
+ if (rc) {
+ page = gfn_to_page(kvm, gfn);
+ put_page(page);
This is racy. gfn_to_page() can return a different page each time it is
called. Instead iommu_map_page() should drop the refcount if it fails.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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