From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Yang, Sheng" Subject: [RFC][PATCH 7/7] kvm: qemu: Enable EPT support for real mode Date: Fri, 1 Feb 2008 16:26:26 +0800 Message-ID: <200802011626.26749.sheng.yang@intel.com> Mime-Version: 1.0 Content-Type: Multipart/Mixed; boundary="Boundary-00=_yetoHyn1MpALtjr" Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org To: Avi Kivity Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org --Boundary-00=_yetoHyn1MpALtjr Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline =46rom de2bedf0890c95828b07ba3d2d98025fd39050a1 Mon Sep 17 00:00:00 2001 =46rom: Sheng Yang Date: Fri, 1 Feb 2008 07:33:13 +0800 Subject: [PATCH] kvm: qemu: Enable EPT support for real mode The patch allocated one page from 0xcf000 (the last page of vga bios region= ), took it as the guest identity mapped page table in real mode. Then we can support EPT in real mode by using the address as guest CR3. Signed-off-by: Sheng Yang =2D-- 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 0e0d051..f3fa49c 100644 =2D-- a/qemu/hw/pc.c +++ b/qemu/hw/pc.c @@ -758,6 +758,9 @@ static void pc_init1(ram_addr_t ram_size, int=20 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 >=3D 0xe0000000 ) { above_4g_mem_size =3D ram_size - 0xe0000000; @@ -851,6 +854,17 @@ static void pc_init1(ram_addr_t ram_size, int=20 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 =3D _PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | + * _PAGE_DIRTY | _PAGE_PSE */ + table_items =3D (void *)(phys_ram_base + vga_bios_offset + 0xf000); + for (i =3D 0; i < 1024; i++) + table_items[i] =3D (i << 22) + 0xe7; + } +#endif + /* above 4giga memory allocation */ if (above_4g_mem_size > 0) { ram_addr =3D qemu_ram_alloc(above_4g_mem_size); =2D- debian.1.5.3.7.1-dirty --Boundary-00=_yetoHyn1MpALtjr Content-Type: text/x-diff; charset="utf-8"; name="0001-kvm-qemu-Enable-EPT-support-for-real-mode.patch" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="0001-kvm-qemu-Enable-EPT-support-for-real-mode.patch" =46rom de2bedf0890c95828b07ba3d2d98025fd39050a1 Mon Sep 17 00:00:00 2001 =46rom: Sheng Yang Date: Fri, 1 Feb 2008 07:33:13 +0800 Subject: [PATCH] kvm: qemu: Enable EPT support for real mode The patch allocated one page from 0xcf000 (the last page of vga bios region= ), took it as the guest identity mapped page table in real mode. Then we can support EPT in real mode by using the address as guest CR3. Signed-off-by: Sheng Yang =2D-- 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 0e0d051..f3fa49c 100644 =2D-- a/qemu/hw/pc.c +++ b/qemu/hw/pc.c @@ -758,6 +758,9 @@ static void pc_init1(ram_addr_t ram_size, int vga_ram_s= ize, int index; BlockDriverState *hd[MAX_IDE_BUS * MAX_IDE_DEVS]; BlockDriverState *fd[MAX_FD]; +#ifdef USE_KVM + uint32_t *table_items; +#endif =20 if (ram_size >=3D 0xe0000000 ) { above_4g_mem_size =3D ram_size - 0xe0000000; @@ -851,6 +854,17 @@ static void pc_init1(ram_addr_t ram_size, int vga_ram_= size, exit(1); } =20 +#ifdef USE_KVM + if (kvm_allowed) { + /* set up identity map for EPT at the last page of VGA BIOS region. + * 0xe7 =3D _PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | + * _PAGE_DIRTY | _PAGE_PSE */ + table_items =3D (void *)(phys_ram_base + vga_bios_offset + 0xf000); + for (i =3D 0; i < 1024; i++) + table_items[i] =3D (i << 22) + 0xe7; + } +#endif + /* above 4giga memory allocation */ if (above_4g_mem_size > 0) { ram_addr =3D qemu_ram_alloc(above_4g_mem_size); =2D-=20 debian.1.5.3.7.1-dirty --Boundary-00=_yetoHyn1MpALtjr Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ --Boundary-00=_yetoHyn1MpALtjr Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ kvm-devel mailing list kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org https://lists.sourceforge.net/lists/listinfo/kvm-devel --Boundary-00=_yetoHyn1MpALtjr--