[PATCH 6/6] kvm: qemu: Enable EPT support for real mode

["Yang, Sheng" <sheng.yang@intel.com>]

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From 73c33765f3d879001818cd0719038c78a0c65561 Mon Sep 17 00:00:00 2001
From: Sheng Yang <sheng.yang@intel.com>
Date: Fri, 18 Apr 2008 17:15:39 +0800
Subject: [PATCH] kvm: qemu: Enable EPT support for real mode

This patch build a identity page table on the last page of VGA bios, and use 
it as the guest page table in nonpaging mode for EPT.

Signed-off-by: Sheng Yang <sheng.yang@intel.com>
---
 qemu/hw/pc.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/qemu/hw/pc.c b/qemu/hw/pc.c
index ae87ab9..dcb98c6 100644
--- a/qemu/hw/pc.c
+++ b/qemu/hw/pc.c
@@ -780,6 +780,9 @@ static void pc_init1(ram_addr_t ram_size, int 
vga_ram_size,
     int index;
     BlockDriverState *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
     BlockDriverState *fd[MAX_FD];
+#ifdef USE_KVM
+    uint32_t *table_items;
+#endif

     if (ram_size >= 0xe0000000 ) {
         above_4g_mem_size = ram_size - 0xe0000000;
@@ -857,6 +860,17 @@ static void pc_init1(ram_addr_t ram_size, int 
vga_ram_size,
         exit(1);
     }

+#ifdef USE_KVM
+    if (kvm_allowed) {
+	/* set up identity map for EPT at the last page of VGA BIOS region.
+	 * 0xe7 = _PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED |
+	 *	  _PAGE_DIRTY   | _PAGE_PSE */
+	table_items = (void *)(phys_ram_base + vga_bios_offset + 0xf000);
+	for (i = 0; i < 1024; i++)
+	    table_items[i] = (i << 22) + 0xe7;
+    }
+#endif
+
     /* above 4giga memory allocation */
     if (above_4g_mem_size > 0) {
         ram_addr = qemu_ram_alloc(above_4g_mem_size);
--
1.5.4.5


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From 73c33765f3d879001818cd0719038c78a0c65561 Mon Sep 17 00:00:00 2001
From: Sheng Yang <sheng.yang@intel.com>
Date: Fri, 18 Apr 2008 17:15:39 +0800
Subject: [PATCH] kvm: qemu: Enable EPT support for real mode

This patch build a identity page table on the last page of VGA bios, and use it
as the guest page table in nonpaging mode for EPT.

Signed-off-by: Sheng Yang <sheng.yang@intel.com>
---
 qemu/hw/pc.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/qemu/hw/pc.c b/qemu/hw/pc.c
index ae87ab9..dcb98c6 100644
--- a/qemu/hw/pc.c
+++ b/qemu/hw/pc.c
@@ -780,6 +780,9 @@ static void pc_init1(ram_addr_t ram_size, int vga_ram_size,
     int index;
     BlockDriverState *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
     BlockDriverState *fd[MAX_FD];
+#ifdef USE_KVM
+    uint32_t *table_items;
+#endif
 
     if (ram_size >= 0xe0000000 ) {
         above_4g_mem_size = ram_size - 0xe0000000;
@@ -857,6 +860,17 @@ static void pc_init1(ram_addr_t ram_size, int vga_ram_size,
         exit(1);
     }
 
+#ifdef USE_KVM
+    if (kvm_allowed) {
+	/* set up identity map for EPT at the last page of VGA BIOS region.
+	 * 0xe7 = _PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED |
+	 *	  _PAGE_DIRTY   | _PAGE_PSE */
+	table_items = (void *)(phys_ram_base + vga_bios_offset + 0xf000);
+	for (i = 0; i < 1024; i++)
+	    table_items[i] = (i << 22) + 0xe7;
+    }
+#endif
+
     /* above 4giga memory allocation */
     if (above_4g_mem_size > 0) {
         ram_addr = qemu_ram_alloc(above_4g_mem_size);
-- 
1.5.4.5


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