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[Xen-devel] [PATCH for-4.5] EFI: Ignore EFI commandline, skip console setup when booted from GRUB



Update EFI code to completely ignore the EFI comnandline when booted from GRUB.
Previusly it was parsed of EFI boot specific options, but these aren't used
when booted from GRUB.

Don't do EFI console or video configuration when booted by GRUB.  The EFI boot
code does some console and video initialization to support native EFI boot from
the EFI boot manager or EFI shell.  This initlization should not be done when
booted using GRUB.

Update EFI documentation to indicate that it describes EFI native boot, and
does not apply at all when Xen is booted using GRUB.

Signed-off-by: Roy Franz <roy.franz@xxxxxxxxxx>
---
This patch implements what I understand to be the desired behavior when booting
an EFI Xen image via GRUB based on the thread last week.  The EFI command line
is not used, and the Xen commandline comes via the multiboot protocol (and
in the ARM case the multiboot FDT bindings).  This brings the x86 and arm64
GRUB EFI boot cases into alignment in not using the EFI commandline.

The current state of the arm64 code takes the Xen commandline from the FDT,
but still looks in the EFI commandline for EFI boot specific options.  If
unexpected options are passed in the EFI commandline, it will generate
"unrecognized option" ouput for all unexpected options.

I think this should be considered for 4.5.


 docs/misc/efi.markdown |   5 ++
 xen/common/efi/boot.c  | 237 +++++++++++++++++++++++++------------------------
 2 files changed, 125 insertions(+), 117 deletions(-)

diff --git a/docs/misc/efi.markdown b/docs/misc/efi.markdown
index 5e48aa3..f435ec7 100644
--- a/docs/misc/efi.markdown
+++ b/docs/misc/efi.markdown
@@ -29,6 +29,11 @@ separators will be tried) to be present in the same 
directory as the binary.
 (To illustrate the name handling, a binary named `xen-4.2-unstable.efi` would
 try `xen-4.2-unstable.cfg`, `xen-4.2.cfg`, `xen-4.cfg`, and `xen.cfg` in
 order.) One can override this with a command line option (`-cfg=<filename>`).
+This configuration file and EFI commandline are only used for booting directly
+from EFI firmware, or when using an EFI loader that does not support
+the multiboot2 protocol.  When booting using GRUB or another multiboot aware
+loader the EFI commandline is ignored and all information is passed from
+the loader to Xen using the multiboot protocol.
 
 The configuration file consists of one or more sections headed by a section
 name enclosed in square brackets, with individual values specified in each
diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c
index 4257341..26e3cc8 100644
--- a/xen/common/efi/boot.c
+++ b/xen/common/efi/boot.c
@@ -705,6 +705,7 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE 
*SystemTable)
     union string section = { NULL }, name;
     bool_t base_video = 0;
     char *option_str;
+    bool_t use_cfg_file;
 
     efi_ih = ImageHandle;
     efi_bs = SystemTable->BootServices;
@@ -717,6 +718,7 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE 
*SystemTable)
 
     StdOut = SystemTable->ConOut;
     StdErr = SystemTable->StdErr ?: StdOut;
+    use_cfg_file = efi_arch_use_config_file(SystemTable);
 
     status = efi_bs->HandleProtocol(ImageHandle, &loaded_image_guid,
                                     (void **)&loaded_image);
@@ -725,67 +727,70 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE 
*SystemTable)
 
     efi_arch_load_addr_check(loaded_image);
 
-    argc = get_argv(0, NULL, loaded_image->LoadOptions,
-                    loaded_image->LoadOptionsSize, NULL);
-    if ( argc > 0 &&
-         efi_bs->AllocatePool(EfiLoaderData,
-                              (argc + 1) * sizeof(*argv) +
-                                  loaded_image->LoadOptionsSize,
-                              (void **)&argv) == EFI_SUCCESS )
-        get_argv(argc, argv, loaded_image->LoadOptions,
-                 loaded_image->LoadOptionsSize, &options);
-    else
-        argc = 0;
-    for ( i = 1; i < argc; ++i )
+    if ( use_cfg_file )
     {
-        CHAR16 *ptr = argv[i];
-
-        if ( !ptr )
-            break;
-        if ( *ptr == L'/' || *ptr == L'-' )
+        argc = get_argv(0, NULL, loaded_image->LoadOptions,
+                        loaded_image->LoadOptionsSize, NULL);
+        if ( argc > 0 &&
+             efi_bs->AllocatePool(EfiLoaderData,
+                                  (argc + 1) * sizeof(*argv) +
+                                      loaded_image->LoadOptionsSize,
+                                  (void **)&argv) == EFI_SUCCESS )
+            get_argv(argc, argv, loaded_image->LoadOptions,
+                     loaded_image->LoadOptionsSize, &options);
+        else
+            argc = 0;
+        for ( i = 1; i < argc; ++i )
         {
-            if ( wstrcmp(ptr + 1, L"basevideo") == 0 )
-                base_video = 1;
-            else if ( wstrncmp(ptr + 1, L"cfg=", 4) == 0 )
-                cfg_file_name = ptr + 5;
-            else if ( i + 1 < argc && wstrcmp(ptr + 1, L"cfg") == 0 )
-                cfg_file_name = argv[++i];
-            else if ( wstrcmp(ptr + 1, L"help") == 0 ||
-                      (ptr[1] == L'?' && !ptr[2]) )
+            CHAR16 *ptr = argv[i];
+
+            if ( !ptr )
+                break;
+            if ( *ptr == L'/' || *ptr == L'-' )
             {
-                PrintStr(L"Xen EFI Loader options:\r\n");
-                PrintStr(L"-basevideo   retain current video mode\r\n");
-                PrintStr(L"-cfg=<file>  specify configuration file\r\n");
-                PrintStr(L"-help, -?    display this help\r\n");
-                blexit(NULL);
+                if ( wstrcmp(ptr + 1, L"basevideo") == 0 )
+                    base_video = 1;
+                else if ( wstrncmp(ptr + 1, L"cfg=", 4) == 0 )
+                    cfg_file_name = ptr + 5;
+                else if ( i + 1 < argc && wstrcmp(ptr + 1, L"cfg") == 0 )
+                    cfg_file_name = argv[++i];
+                else if ( wstrcmp(ptr + 1, L"help") == 0 ||
+                          (ptr[1] == L'?' && !ptr[2]) )
+                {
+                    PrintStr(L"Xen EFI Loader options:\r\n");
+                    PrintStr(L"-basevideo   retain current video mode\r\n");
+                    PrintStr(L"-cfg=<file>  specify configuration file\r\n");
+                    PrintStr(L"-help, -?    display this help\r\n");
+                    blexit(NULL);
+                }
+                else
+                {
+                    PrintStr(L"WARNING: Unknown command line option '");
+                    PrintStr(ptr);
+                    PrintStr(L"' ignored\r\n");
+                }
             }
             else
-            {
-                PrintStr(L"WARNING: Unknown command line option '");
-                PrintStr(ptr);
-                PrintStr(L"' ignored\r\n");
-            }
+                section.w = ptr;
         }
-        else
-            section.w = ptr;
-    }
 
-    if ( !base_video )
-    {
-        unsigned int best;
-
-        for ( i = 0, size = 0, best = StdOut->Mode->Mode;
-              i < StdOut->Mode->MaxMode; ++i )
+        if ( !base_video )
         {
-            if ( StdOut->QueryMode(StdOut, i, &cols, &rows) == EFI_SUCCESS &&
-                 cols * rows > size )
+            unsigned int best;
+
+            for ( i = 0, size = 0, best = StdOut->Mode->Mode;
+                  i < StdOut->Mode->MaxMode; ++i )
             {
-                size = cols * rows;
-                best = i;
+                if ( StdOut->QueryMode(StdOut, i, &cols, &rows) == EFI_SUCCESS 
&&
+                     cols * rows > size )
+                {
+                    size = cols * rows;
+                    best = i;
+                }
             }
+            if ( best != StdOut->Mode->Mode )
+                StdOut->SetMode(StdOut, best);
         }
-        if ( best != StdOut->Mode->Mode )
-            StdOut->SetMode(StdOut, best);
     }
 
     PrintStr(L"Xen " __stringify(XEN_VERSION) "." __stringify(XEN_SUBVERSION)
@@ -793,37 +798,37 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE 
*SystemTable)
 
     efi_arch_relocate_image(0);
 
-    if ( StdOut->QueryMode(StdOut, StdOut->Mode->Mode,
-                           &cols, &rows) == EFI_SUCCESS )
-        efi_arch_console_init(cols, rows);
-
-    size = 0;
-    status = efi_bs->LocateHandle(ByProtocol, &gop_guid, NULL, &size, NULL);
-    if ( status == EFI_BUFFER_TOO_SMALL )
-        status = efi_bs->AllocatePool(EfiLoaderData, size, (void **)&handles);
-    if ( !EFI_ERROR(status) )
-        status = efi_bs->LocateHandle(ByProtocol, &gop_guid, NULL, &size,
-                                      handles);
-    if ( EFI_ERROR(status) )
-        size = 0;
-    for ( i = 0; i < size / sizeof(*handles); ++i )
-    {
-        status = efi_bs->HandleProtocol(handles[i], &gop_guid, (void **)&gop);
-        if ( EFI_ERROR(status) )
-            continue;
-        status = gop->QueryMode(gop, gop->Mode->Mode, &info_size, &mode_info);
-        if ( !EFI_ERROR(status) )
-            break;
-    }
-    if ( handles )
-        efi_bs->FreePool(handles);
-    if ( EFI_ERROR(status) )
-        gop = NULL;
-
-    cols = rows = depth = 0;
-    if ( efi_arch_use_config_file(SystemTable) )
+    if ( use_cfg_file )
     {
         EFI_FILE_HANDLE dir_handle;
+        size = 0;
+        cols = rows = depth = 0;
+
+        if ( StdOut->QueryMode(StdOut, StdOut->Mode->Mode,
+                               &cols, &rows) == EFI_SUCCESS )
+            efi_arch_console_init(cols, rows);
+
+        status = efi_bs->LocateHandle(ByProtocol, &gop_guid, NULL, &size, 
NULL);
+        if ( status == EFI_BUFFER_TOO_SMALL )
+            status = efi_bs->AllocatePool(EfiLoaderData, size, (void 
**)&handles);
+        if ( !EFI_ERROR(status) )
+            status = efi_bs->LocateHandle(ByProtocol, &gop_guid, NULL, &size,
+                                          handles);
+        if ( EFI_ERROR(status) )
+            size = 0;
+        for ( i = 0; i < size / sizeof(*handles); ++i )
+        {
+            status = efi_bs->HandleProtocol(handles[i], &gop_guid, (void 
**)&gop);
+            if ( EFI_ERROR(status) )
+                continue;
+            status = gop->QueryMode(gop, gop->Mode->Mode, &info_size, 
&mode_info);
+            if ( !EFI_ERROR(status) )
+                break;
+        }
+        if ( handles )
+            efi_bs->FreePool(handles);
+        if ( EFI_ERROR(status) )
+            gop = NULL;
 
         /* Get the file system interface. */
         dir_handle = get_parent_handle(loaded_image, &file_name);
@@ -931,49 +936,47 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE 
*SystemTable)
 
         dir_handle->Close(dir_handle);
 
-    }
-
-    if ( gop && !base_video )
-    {
-        for ( i = size = 0; i < gop->Mode->MaxMode; ++i )
+        if ( gop && !base_video )
         {
-            unsigned int bpp = 0;
-
-            status = gop->QueryMode(gop, i, &info_size, &mode_info);
-            if ( EFI_ERROR(status) )
-                continue;
-            switch ( mode_info->PixelFormat )
+            for ( i = size = 0; i < gop->Mode->MaxMode; ++i )
             {
-            case PixelBitMask:
-                bpp = hweight32(mode_info->PixelInformation.RedMask |
-                                mode_info->PixelInformation.GreenMask |
-                                mode_info->PixelInformation.BlueMask);
-                break;
-            case PixelRedGreenBlueReserved8BitPerColor:
-            case PixelBlueGreenRedReserved8BitPerColor:
-                bpp = 24;
-                break;
-            default:
-                continue;
-            }
-            if ( cols == mode_info->HorizontalResolution &&
-                 rows == mode_info->VerticalResolution &&
-                 (!depth || bpp == depth) )
-            {
-                gop_mode = i;
-                break;
-            }
-            if ( !cols && !rows &&
-                 mode_info->HorizontalResolution *
-                 mode_info->VerticalResolution > size )
-            {
-                size = mode_info->HorizontalResolution *
-                       mode_info->VerticalResolution;
-                gop_mode = i;
+                unsigned int bpp = 0;
+
+                status = gop->QueryMode(gop, i, &info_size, &mode_info);
+                if ( EFI_ERROR(status) )
+                    continue;
+                switch ( mode_info->PixelFormat )
+                {
+                case PixelBitMask:
+                    bpp = hweight32(mode_info->PixelInformation.RedMask |
+                                    mode_info->PixelInformation.GreenMask |
+                                    mode_info->PixelInformation.BlueMask);
+                    break;
+                case PixelRedGreenBlueReserved8BitPerColor:
+                case PixelBlueGreenRedReserved8BitPerColor:
+                    bpp = 24;
+                    break;
+                default:
+                    continue;
+                }
+                if ( cols == mode_info->HorizontalResolution &&
+                     rows == mode_info->VerticalResolution &&
+                     (!depth || bpp == depth) )
+                {
+                    gop_mode = i;
+                    break;
+                }
+                if ( !cols && !rows &&
+                     mode_info->HorizontalResolution *
+                     mode_info->VerticalResolution > size )
+                {
+                    size = mode_info->HorizontalResolution *
+                           mode_info->VerticalResolution;
+                    gop_mode = i;
+                }
             }
         }
     }
-
     efi_arch_edd();
 
     /* XXX Collect EDID info. */
-- 
1.9.1


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