5:29 a.m.
Guest tools for Windows in Parallels / Virtuozzo Server 6 contain a
paravirtualized video driver, which wants to take full control of the video
mode. To avoid excessive video mode switches in UEFI VMs it executes
"bcdedit /set {current} graphicsmodedisabled true".
When such a VM is imported into a QEMU/KVM-based hypervisor, the standard video
drivers in Windows do not set the video mode as they expect it to have already
been configured by the bootloader. As a result, the VM runs with black screen.
To solve this issue, we need to try to lead the BCD to the default state.
Changes from v1:
- replaced i_uefi bool to a new i_firmware (1)
Pavel Butsykin (2):
v2v: fill the list of the EFI system partitions
v2v: remove the 'graphicsmodedisabled' entry in ESP BCD
v2v/convert_linux.ml | 7 +++----
v2v/convert_windows.ml | 41 +++++++++++++++++++++++++++++++++++++++++
v2v/inspect_source.ml | 34 +++++++++++++++++++++-------------
v2v/types.ml | 12 +++++++++---
v2v/types.mli | 8 +++++++-
v2v/v2v.ml | 5 ++++-
v2v/v2v_unit_tests.ml | 2 +-
7 files changed, 86 insertions(+), 23 deletions(-)
--
2.8.3
5:29 a.m.
New subject: [PATCH v2 1/2] v2v: fill the list of the EFI system partitions
Store the list of EFI system partitions on the inspect object in order to be
able to tune their contents later in the process.
Signed-off-by: Pavel Butsykin <pbutsykin(a)virtuozzo.com>
---
v2v/convert_linux.ml | 7 +++----
v2v/inspect_source.ml | 34 +++++++++++++++++++++-------------
v2v/types.ml | 12 +++++++++---
v2v/types.mli | 8 +++++++-
v2v/v2v.ml | 5 ++++-
v2v/v2v_unit_tests.ml | 2 +-
6 files changed, 45 insertions(+), 23 deletions(-)
diff --git a/v2v/convert_linux.ml b/v2v/convert_linux.ml
index 08b27d6..7eef2ab 100644
--- a/v2v/convert_linux.ml
+++ b/v2v/convert_linux.ml
@@ -97,10 +97,9 @@ let rec convert ~keep_serial_console (g : G.guestfs) inspect source
rcaps =
"/boot/grub/grub.conf", `Grub1;
] in
let locations =
- if inspect.i_uefi then
- ("/boot/efi/EFI/redhat/grub.cfg", `Grub2) :: locations
- else
- locations in
+ match inspect.i_firmware with
+ | I_UEFI devs -> ("/boot/efi/EFI/redhat/grub.cfg", `Grub2) ::
locations
+ | I_BIOS -> locations in
try
List.find (
fun (grub_config, _) -> g#is_file ~followsymlinks:true grub_config
diff --git a/v2v/inspect_source.ml b/v2v/inspect_source.ml
index 65dcb88..d25c984 100644
--- a/v2v/inspect_source.ml
+++ b/v2v/inspect_source.ml
@@ -65,11 +65,6 @@ let rec inspect_source root_choice g =
StringMap.add name (app :: vs) map
) StringMap.empty apps in
- (* See if this guest could use UEFI to boot. It should use GPT and
- * it should have an EFI System Partition (ESP).
- *)
- let uefi = has_uefi_bootable_device g in
-
let inspect = {
i_root = root;
i_type = g#inspect_get_type root;
@@ -84,7 +79,7 @@ let rec inspect_source root_choice g =
i_mountpoints = mps;
i_apps = apps;
i_apps_map = apps_map;
- i_uefi = uefi
+ i_firmware = get_firmware_bootable_device g;
} in
debug "%s" (string_of_inspect inspect);
@@ -153,10 +148,12 @@ and reject_if_not_installed_image g root =
if fmt <> "installed" then
error (f_"libguestfs thinks this is not an installed operating system (it might
be, for example, an installer disk or live CD). If this is wrong, it is probably a bug in
libguestfs. root=%s fmt=%s") root fmt
-and has_uefi_bootable_device g =
+and get_firmware_bootable_device g =
let rec uefi_ESP_guid = "C12A7328-F81F-11D2-BA4B-00A0C93EC93B"
and is_uefi_ESP dev { G.part_num = partnum } =
g#part_get_gpt_type dev (Int32.to_int partnum) = uefi_ESP_guid
+ and part_dev_name dev { G.part_num = partnum } =
+ sprintf "%s%d" dev (Int32.to_int partnum)
and parttype_is_gpt dev =
try g#part_get_parttype dev = "gpt"
with G.Error msg as exn ->
@@ -164,14 +161,25 @@ and has_uefi_bootable_device g =
if g#last_errno () <> G.Errno.errno_EINVAL then raise exn;
debug "%s (ignored)" msg;
false
- and is_uefi_bootable_device dev =
- parttype_is_gpt dev && (
- let partitions = Array.to_list (g#part_list dev) in
- List.exists (is_uefi_ESP dev) partitions
- )
+ and is_uefi_bootable_part dev part =
+ parttype_is_gpt dev && is_uefi_ESP dev part
in
let devices = Array.to_list (g#list_devices ()) in
- List.exists is_uefi_bootable_device devices
+ let uefi_list = ref [] in
+
+ List.iter (
+ fun dev ->
+ Array.iter (
+ fun part ->
+ if (is_uefi_bootable_part dev part) then (
+ uefi_list := (part_dev_name dev part) :: !uefi_list
+ )
+ ) (g#part_list dev)
+ ) devices;
+
+ match !uefi_list with
+ | [] -> I_BIOS
+ | devices -> I_UEFI devices
(* If some inspection fields are "unknown", then that indicates a
* failure in inspection, and we shouldn't continue. For an example
diff --git a/v2v/types.ml b/v2v/types.ml
index 08e1631..bff03a2 100644
--- a/v2v/types.ml
+++ b/v2v/types.ml
@@ -301,6 +301,10 @@ let string_of_target_firmware = function
| TargetBIOS -> "bios"
| TargetUEFI -> "uefi"
+type i_firmware =
+ | I_BIOS
+ | I_UEFI of string list
+
type inspect = {
i_root : string;
i_type : string;
@@ -315,7 +319,7 @@ type inspect = {
i_mountpoints : (string * string) list;
i_apps : Guestfs.application2 list;
i_apps_map : Guestfs.application2 list StringMap.t;
- i_uefi : bool;
+ i_firmware : i_firmware;
}
let string_of_inspect inspect =
@@ -330,7 +334,7 @@ i_package_format = %s
i_package_management = %s
i_product_name = %s
i_product_variant = %s
-i_uefi = %b
+i_firmware = %s
" inspect.i_root
inspect.i_type
inspect.i_distro
@@ -341,7 +345,9 @@ i_uefi = %b
inspect.i_package_management
inspect.i_product_name
inspect.i_product_variant
- inspect.i_uefi
+ (match inspect.i_firmware with
+ | I_BIOS -> "BIOS"
+ | I_UEFI devices -> sprintf "UEFI [%s]" (String.concat ", "
devices))
type mpstat = {
mp_dev : string;
diff --git a/v2v/types.mli b/v2v/types.mli
index dacc991..25420df 100644
--- a/v2v/types.mli
+++ b/v2v/types.mli
@@ -204,6 +204,10 @@ type target_firmware = TargetBIOS | TargetUEFI
val string_of_target_firmware : target_firmware -> string
+type i_firmware =
+ | I_BIOS
+ | I_UEFI of string list
+
type inspect = {
i_root : string; (** Root device. *)
i_type : string; (** Usual inspection fields. *)
@@ -221,7 +225,9 @@ type inspect = {
(** This is a map from the app name to the application object.
Since RPM allows multiple packages with the same name to be
installed, the value is a list. *)
- i_uefi : bool; (** True if the guest could boot with UEFI. *)
+ i_firmware : i_firmware;
+ (** The list of EFI system partitions for the guest with UEFI,
+ otherwise the BIOS identifier. *)
}
(** Inspection information. *)
diff --git a/v2v/v2v.ml b/v2v/v2v.ml
index fe81df5..79b6f04 100644
--- a/v2v/v2v.ml
+++ b/v2v/v2v.ml
@@ -555,7 +555,10 @@ and get_target_firmware inspect guestcaps source output =
| BIOS -> TargetBIOS
| UEFI -> TargetUEFI
| UnknownFirmware ->
- if inspect.i_uefi then TargetUEFI else TargetBIOS in
+ match inspect.i_firmware with
+ | I_BIOS -> TargetBIOS
+ | I_UEFI devs -> TargetUEFI
+ in
let supported_firmware = output#supported_firmware in
if not (List.mem target_firmware supported_firmware) then
error (f_"this guest cannot run on the target, because the target does not
support %s firmware (supported firmware on target: %s)")
diff --git a/v2v/v2v_unit_tests.ml b/v2v/v2v_unit_tests.ml
index 95d8430..7b41585 100644
--- a/v2v/v2v_unit_tests.ml
+++ b/v2v/v2v_unit_tests.ml
@@ -30,7 +30,7 @@ let inspect_defaults = {
i_major_version = 0; i_minor_version = 0;
i_root = ""; i_package_format = ""; i_package_management =
"";
i_product_name = ""; i_product_variant = ""; i_mountpoints = [];
- i_apps = []; i_apps_map = StringMap.empty; i_uefi = false
+ i_apps = []; i_apps_map = StringMap.empty; i_firmware = BIOS
}
let test_get_ostype ctx =
--
2.8.3
5:29 a.m.
New subject: [PATCH v2 2/2] v2v: remove the 'graphicsmodedisabled' entry in ESP BCD
Guest tools for Windows in Parallels / Virtuozzo Server 6 contain a
paravirtualized video driver, which wants to take full control of the video
mode. To avoid excessive video mode switches in UEFI VMs it executes
"bcdedit /set {current} graphicsmodedisabled true".
When such a VM is imported into a QEMU/KVM-based hypervisor, the
standard video drivers in Windows do not set the video mode as they
expect it to have already been configured by the bootloader. As a result,
the VM runs with black screen.
So patch the BCD store (which is a Windows registry hive with a special
structure, located on the EFI system partition) to clear this setting.
Signed-off-by: Pavel Butsykin <pbutsykin(a)virtuozzo.com>
---
v2v/convert_windows.ml | 41 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/v2v/convert_windows.ml b/v2v/convert_windows.ml
index 62bb536..9502578 100644
--- a/v2v/convert_windows.ml
+++ b/v2v/convert_windows.ml
@@ -466,6 +466,45 @@ if errorlevel 3010 exit /b 0
ignore (g#pwrite_device rootpart bytes 0x1a_L)
)
)
+
+ and fix_win_esp () =
+ let fix_win_uefi_bcd esp_path =
+ try
+ let bcd_path = "/EFI/Microsoft/Boot/BCD" in
+ Windows.with_hive_write g (esp_path ^ bcd_path) (
+ (* Remove the 'graphicsmodedisabled' key in BCD *)
+ fun root ->
+ let path = ["Objects";
"{9dea862c-5cdd-4e70-acc1-f32b344d4795}";
+ "Elements"; "23000003"] in
+ let boot_mgr_default_link =
+ match Windows.get_node g root path with
+ | None -> raise Not_found
+ | Some node -> node in
+ let current_boot_entry = g#hivex_value_utf8 (
+ g#hivex_node_get_value boot_mgr_default_link "Element") in
+ let path = ["Objects"; current_boot_entry; "Elements";
"16000046"] in
+ match Windows.get_node g root path with
+ | None -> raise Not_found
+ | Some graphics_mode_disabled ->
+ g#hivex_node_delete_child graphics_mode_disabled
+ );
+ with
+ Not_found -> ()
+ in
+
+ let esp_temp_path = g#mkdtemp "/Windows/Temp/ESP_XXXXXX" in
+
+ match inspect.i_firmware with
+ | I_BIOS -> ()
+ | I_UEFI esp_list ->
+ List.iter (
+ fun dev_path ->
+ g#mount dev_path esp_temp_path;
+ fix_win_uefi_bcd esp_temp_path;
+ g#umount esp_temp_path;
+ ) esp_list;
+
+ g#rmdir esp_temp_path;
in
(* Firstboot configuration. *)
@@ -480,6 +519,8 @@ if errorlevel 3010 exit /b 0
fix_ntfs_heads ();
+ fix_win_esp ();
+
(* Warn if installation of virtio block drivers might conflict with
* group policy or AV software causing a boot 0x7B error (RHBZ#1260689).
*)
--
2.8.3
12:26 p.m.
New subject: [PATCH v2 2/2] v2v: remove the 'graphicsmodedisabled' entry in ESP BCD
Thanks, I pushed both patches. Note you will get conflicts when you
pull, since I have folded in some fixes, largely cosmetic, but there
were two more important ones:
(1) v2v_unit_tests: BIOS -> I_BIOS. Please run the tests!
(2) The code below
+ let esp_temp_path = g#mkdtemp
"/Windows/Temp/ESP_XXXXXX" in
+
+ match inspect.i_firmware with
+ | I_BIOS -> ()
+ | I_UEFI esp_list ->
+ List.iter (
+ fun dev_path ->
+ g#mount dev_path esp_temp_path;
+ fix_win_uefi_bcd esp_temp_path;
+ g#umount esp_temp_path;
+ ) esp_list;
+
+ g#rmdir esp_temp_path;
doesn't do what you think. The match statement extends all the way
through to the g#rmdir, so g#rmdir will only be executed along the
I_UEFI path.
My solution to this was to move the g#mkdtemp into the I_UEFI path
also, since we only want that directory when dealing with UEFI, not
with BIOS.
Thanks for your contributions,
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
Fedora Windows cross-compiler. Compile Windows programs, test, and
build Windows installers. Over 100 libraries supported.
http://fedoraproject.org/wiki/MinGW
4:24 a.m.
New subject: [PATCH v2 2/2] v2v: remove the 'graphicsmodedisabled' entry in ESP BCD
On 12.06.2016 20:26, Richard W.M. Jones wrote:
Thanks, I pushed both patches. Note you will get conflicts when you
pull, since I have folded in some fixes, largely cosmetic, but there
were two more important ones:
(1) v2v_unit_tests: BIOS -> I_BIOS. Please run the tests!
Thanks, next time I will use unit test.. But I had to strain to make
them just work :)
(2) The code below
> + let esp_temp_path = g#mkdtemp "/Windows/Temp/ESP_XXXXXX" in
> +
> + match inspect.i_firmware with
> + | I_BIOS -> ()
> + | I_UEFI esp_list ->
> + List.iter (
> + fun dev_path ->
> + g#mount dev_path esp_temp_path;
> + fix_win_uefi_bcd esp_temp_path;
> + g#umount esp_temp_path;
> + ) esp_list;
> +
> + g#rmdir esp_temp_path;
doesn't do what you think. The match statement extends all the way
through to the g#rmdir, so g#rmdir will only be executed along the
I_UEFI path.
My solution to this was to move the g#mkdtemp into the I_UEFI path
also, since we only want that directory when dealing with UEFI, not
with BIOS.
I apologize for my carelessness.
Thanks for your contributions,
Rich.
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4 comments
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participants (2)
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Richard W.M. Jones